Fourth Five-year Review Report for Calhoun Park Area Superfund Site Charleston County South Carolina

FOURTH FIVE-YEAR REVIEW REPORT FOR CALHOUN PARK AREA SUPERFUND SITE CHARLESTON COUNTY, SOUTH CAROLINA a rnA otrA August 2024 Prepared for U.S. Environmental Protection Agency Region 4 Atlanta, Georgia CAROLINE FREEMAN Digitally signed by CAROLINE FREEMAN Date: 2024.08.29 15:12:41 -04'00' Caroline Y. Freeman, Director Superfund & Emergency Management Division ------- 11 ------- e of Contents LIST OF ABBREVIATIONS & ACRONYMS vii I. INTRODUCTION 1 Site Background 1 Five-Year Review Summary Form 3 II. RESPONSE ACTION SUMMARY 3 Basis for Taking Action 3 Response Actions 5 Status of Implementation 12 Institutional Controls (IC) 15 IC Summary Table 17 Systems Operations/Operation and Maintenance (O&M) 19 III. PROGRESS SINCE THE LAST REVIEW 19 Other Findings 22 IV. FIVE-YEAR REVIEW PROCESS 23 Community Notification, Involvement & Site Interviews 23 Data Review 24 Site Inspection 30 V. TECHNICAL ASSESSMENT 31 QUESTION A: Is the remedy functioning as intended by the decision documents? 31 QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels and RAOs used at the time of the remedy selection still valid? 32 QUESTION C: Has any other information come to light that could call into question the protectiveness of the remedy? 33 VI. ISSUES/RECOMMENDATIONS 34 Other Findings 34 VII. PROTECTIVENESS STATEMENT 36 VIII. NEXT REVIEW 37 APPENDIX A-REFERENCE LIST A-l APPENDIX B - CURRENT SITE STATUS B-l APPENDIX C - SITE CHRONOLOGY C-l APPENDIX D - PRESS NOTICE D-l APPENDIX E - SITE MAPS E-l APPENDIX F - INTERVIEW FORMS F-l APPENDIX G - SITE INSPECTION CHECKLIST G-l APPENDIX H - DETAILED ARARs REVIEW H-l APPENDIX I - TOXICITY ASSESSMENT 1-1 APPENDIX J - SHALLOW GROUNDWATER DATA J-l APPENDIX K - INTERMEDIATE GROUNDWATER DATA K-l APPENDIX L - DNAPL DATA L-l APPENDIX M- SITE PHOTOGRAPHS M-l APPENDIX N - INSTITUTIONAL CONTROL INSTRUMENTS N-l ill ------- es Table 1: COCs by Media 5 Table 2:1998 ROD Established Remediation Goals for OU-1 8 Table 3:1998 OU-1 ROD Soil PRGs 9 Table 4: 2002 OU-2 ROD Intermediate Groundwater COC Cleanup Goals 11 Table 5: Summary of Planned and/or Implemented Institutional Controls 17 Table 6: Protectiveness Determination/Statements from 2019 FYR 20 Table 7: Status of Recommendations from 2019 FYR 21 Table C-l: Site Chronology C-l Table H-l: Chemical Specific ARARs H-2 Table H-2: Location Specific ARARs H-3 Table H-3: Action Specific ARARs H-3 Table H-4: Groundwater ARAR Review H-4 Table 1-1: Review of Groundwater Cleanup Goals 1-1 Table 1-2: Vapor Intrusion Evaluation - From April 2019 to April 2023 1-2 Table 1-3: Review of Soil Cleanup Goals - Commercial 1-3 Table 1-4: Review of Soil Cleanup Goals - Residential 1-3 Table 1-5: Review of Sediment Cleanup Goals 1-4 Table J-l: Shallow Groundwater Monitoring Locations J-2 Table J-2: Summary of Groundwater Analytical Parameters and Methods J-3 Table J-3: Benzene Historical Analytical Results - Aqueous Plume Wells J-4 Table J-4: Naphthalene Historical Analytical Results - Aqueous Plume Wells J-5 Table J-5: Summary of Historical Shallow Groundwater Quality Data J-8 Table J-6: Summary of Historical Shallow Groundwater Quality Data J-15 Table J-7: Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL J-20 Table K-l: Intermediate Sand Unit Groundwater Monitoring Wells K-2 Table K-2: Analytical Parameters and Methods for Intermediate Groundwater Monitoring Program.. K-3 Table K-3: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 K-8 Table L-l:Cumulative Total of DNAPL Recovered L-2 Table L-2: Summary of DNAPL Shipments from January 2000 to May 2023 L-3 Table L-3: Apparent DNAPL Thickness Monitoring Schedule L-4 Table L-4: Average Monthly DNAPL Removed Compared to Total Removal Events L-ll Table L-5: Evaluation and Interpretation of Removal Trends forTrench DNAPL Recovery Wells L-12 Table L-6: Summary of Apparent DNAPL Thickness in Wells and Averages L-13 Table L-7: DNAPL Volume Removed 6-Month Comparison L-14 Table L-8: MW-12A DNAPL Measurements and Pumping Activity L-18 iv ------- Figures Figure 1: Institutional Controls Map 18 Figure E-l: Site Location Map E-2 Figure E-2: Historical Site Map (Source: Management and Technical Resources, Inc.) E-3 Figure J-l: Shallow Groundwater Sampling Locations E-6 Figure J-2: Average Benzene and Naphthalene Concentrations with Time from Aqueous Plume Wells - LM-01AR, LM-02A, MM-02A, MM-03A, MRW-01, MRW-02, & MZ-02AR J-7 Figure J-3: Historical Benzene Groundwater Analytical Results Through May 2023 J-18 Figure J-4: Historical Naphthalene Groundwater Analytical Results Through May 2023 J-19 Figure J-5: Shallow Groundwater Monitoring Wells with Intermittent Trace Amounts of DNAPL J-22 Figure J-6: Illustrations of Benzene Concentrations from January 1994 to May 2023 J-23 Figure J-7: Illustrations of Naphthalene Concentrations from January 1994 to May 2023 J-24 Figure K-l: Intermediate Groundwater Monitoring Locations K-4 Figure K-2: Historical Benzene and Naphthalene Analytical Results in Upper Intermediate Sand Unit from 2000 to 2022 K-5 Figure K-3: Historical Benzene and Naphthalene Analytical Results Middle Intermediate Sand Unit from 1999 to 2022 K-6 Figure K-4: Historical Benzene and Naphthalene Analytical Results Lower Intermediate Sand Unit from 1994 to 2022 K-7 Figure K-5: Apparent DNAPL Thickness - Intermediate Sand Units (December 2019) K-24 Figure K-6: Apparent DNAPL Thickness - Intermediate Sand Units (December 2020) K-25 Figure K-7: Apparent DNAPL Thickness - Intermediate Sand Units (November 2021) K-26 Figure K-8: Apparent DNAPL Thickness - Intermediate Sand Units (December 2022) K-27 Figure L-l: DNAPL Recovery Volumes by Segments (from 2002 to 2023) L-5 Figure L-2: DNAPL Recovery Trends with Time L-6 Figure L-3: DRW-06 Historical Monthly Volume Removed and Apparent DNAPL Thickness L-7 Figure L-4: DRW-06 Total DNAPL Volume Removed from March 2001 to May 2023 L-8 Figure L-5: Total DNAPL Volume Removed During 6-Month Reporting Periods L-9 Figure L-6: Total DNAPL Volume Removed by Month L-10 Figure L-7: Average Monthly Volume Removed and Total Removal Events During 6-Month Reporting Periods L-15 Figure L-8: Plot of Average DNAPL Manually Removed per Removal Event Versus Time L-16 Figure L-9: Linear Plot of Volume Removed Versus Time for Winter Months L-17 v ------- Site Photographs Site Photograph M-l: DESC 1/2 Charlotte Street Substation Entrance M-l Site Photograph M-2: DESC Substation (east to west) M-2 Site Photograph M-3: Middle of DESC Substation (from southeast to northwest) M-2 Site Photograph M-5: Calhoun Park Area (from parking garage east towards the Cooper River) M-3 Site Photograph M-4: DESC Substation (from top of parking garage towards the Ports Authority) M-3 Site Photograph M-7: Cooper River (from Charlotte Street Park Irish Memorial south) M-4 Site Photograph M-6: Calhoun Park Area (from parking garage south towards Gadsdenboro Park) ...M-4 Site Photograph M-8: DRW-35 M-5 Site Photograph M-9: DRW-33 M-6 Site Photograph M-10: DRW-6 (555th drum) M-7 Site Photograph M-ll: BM-03D (Located in Parcel 4591304005) M-8 vi ------- LIST OF ABBREVIATIONS & ACRONYMS AR Administrative Record ARAR Applicable or Relevant and Appropriate Requirement BTEX Benzene, Toluene, Ethylbenzene and Xylene CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CFR Code of Federal Regulations CIC Community Involvement Coordinator COC Contaminant of Concern DESC Dominion Energy South Carolina DNAPL Dense Non-Aqueous Phase Liquid EPA United States Environmental Protection Agency ESD Explanation of Significant Differences ESGTU Equilibrium Partitioning Sediment Guideline Toxicity Unit FYR Five-Year Review HQ Hazard Quotient IC Institutional Control Hg/L Micrograms Per Liter Hg/m3 Micrograms Per Cubic Meter mg/kg Milligrams per Kilogram mg/L Milligrams per Liter MDL Minimum Detection Limit MCL Maximums Contaminant Level MW Monitoring Well NCP National Contingency Plan NPL National Priorities List NPS National Park Service O&M Operation and Maintenance OU Operable Unit PAH Polycyclic Aromatic Hydrocarbon PRP Potentially Responsible Party RAO Remedial Action Objective Rl Remedial Investigation RL Reporting Limit ROD Record of Decision RPM Remedial Project Manager RSL Regional Screening Level RV Recreational Vehicle SCDHEC South Carolina Department of Health and Environmental Control SCE&G South Carolina Electric & Gas Company SVOC Semivolatile Organic Compound USGS United States Geological Survey UU/UE Unlimited Use and Unrestricted Exposure VISL Vapor Intrusion Screening Level VOC Volatile Organic Compound WQC Water Quality Criteria vii ------- I. INTRODUCTION The purpose of a five-year review (FYR) is to evaluate the implementation and performance of a remedy to determine if the remedy is and will continue to be protective of human health and the environment. The methods, findings, and conclusions of reviews are documented in FYR reports such as this one. In addition, FYR reports identify issues found during the review, if any, and document recommendations to address them. The U.S. Environmental Protection Agency is preparing this FYR pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Section 121, consistent with the National Contingency Plan (NCP)(40 Code of Federal Regulations (CFR) Section 300.430(f)(4)(ii)), and considering EPA policy. This is the fourth FYR for the Calhoun Park Area Superfund site (the Site). The triggering action for this statutory review is the completion date of the previous FYR. The FYR has been prepared because hazardous substances, pollutants or contaminants remain at the Site above levels that allow for unlimited use and unrestricted exposure (UU/UE). The Site consists of two operable units (OUs), both of which are addressed in this FYR. OU-1 addresses soil, dense nonaqueous phase liquid (DNAPL) and shallow groundwater. OU-2 addresses intermediate groundwater, surface water and sediment in the Cooper River.1 The South Carolina Department of Health and Environmental Control (SCDHEC) conducted the FYR and prepared this report regarding the remedy implemented at the Site. The SCDHEC personnel conducted this review from October 2023 to March 2024. The EPA is the lead agency for developing and implementing the remedy for the cleanup at the Site. The relevant entity, Dominion Energy South Carolina, Inc.2 (DESC) was notified of the initiation of the FYR. The review began on October 23, 2023. Site Background The Site is located on the peninsula of Charleston, South Carolina. From 1855 to 1957, a manufactured gas plant operated on site and produced coal tar as a byproduct of the manufacturing process. Plant operations contaminated area soil, groundwater, and sediment. The Site includes areas affected by manufactured gas plant operations, which include an electrical substation property, a large parking garage, National Park Service (NPS) property (which includes the Fort Sumter Tour Boat facility and Liberty Square), the Irish Memorial at Charlotte Street Park, the South Carolina Aquarium, former Luden's Marine property, the former Ansonborough Homes housing project (which now includes Gadsdenboro Park) and capped sediment areas in the Cooper River (Figure 1 and Figure E-l in 1 The 2002 OU-2 Record of Decision (ROD) determined that surface water required no additional action to protect public health and the environment because of previous response actions. 2 SCE&G is the official PRP and is a subsidiary of SCANA. Dominion Energy purchased SCANA in January 2019. SCE&G's name changed to Dominion Energy South Carolina, Inc. (DESC) on April 15, 2019, but SCANA still exists. 1 ------- Appendix E). Site surroundings include commercial, industrial, and residential developments. The Cooper River borders the Site to the east. The original plant operated on the location of the electrical substation, which is now in use by DESC. The Site is in an area of filled tidal creek channels and fill placed along the Cooper River shoreline. The following geological units are under the Site: fill material/upper sand, upper clay, upper intermediate sand, middle intermediate sand, lower intermediate sand, and the Ashley Formation of the Cooper Group. Shallow groundwater at the Site is in the fill material/upper sand; intermediate groundwater is in the interval between the upper clay and deeper Ashley Formation. The upper clay unit is relatively shallow (about 10 feet below ground surface) and generally serves as a unit of lower permeability. However, there are some permeable areas in the upper clay, and the clay was likely breached during installation of the gas holder on the electrical substation property.3 Therefore, the DNAPL source areas are mostly in the shallow aquifer, but DNAPL is also observed in the intermediate aquifer. Drinking water in the area is supplied by the City of Charleston, which uses an upgradient surface water supply that is not influenced by the Site. Groundwater near the Cooper River is saline or brackish. The Cooper River is used for recreational fishing. Appendix A provides a list of references used during this FYR. Appendix B provides detailed site status information. Appendix C provides a chronology of site events. 3 The former gasholder is a circular, subsurface structure with walls constructed of 1-inch thick steel and cemented brick, a wooden floor and an interior filled with debris and soil. 2 ------- Five-Year Review Summary Form SITE IDENTIFICATION Site Name: Calhoun Park Area EPA ID: SCD987581337 \| Region: 4 State: SC City/County: Charleston/Charleston County SITE STATUS NPL Status: Non-NPL Multiple OUs? Yes REVIEW STATUS Lead agency: EPA Author name: Allan Hernandez (EPA) and Timothy Kadar (SCDHEC) Author affiliation: EPA and SCDHEC Review period: 10/23/2023 - 8/15/2024 Date of site inspection: 2/14/2024 Type of review: Statutory Review number: 4 Triggering action date: 8/15/2019 Due date (five years after triggering action date): 8/15/2024 II. RESPONSE ACTION SUMMARY Basis for Taking Action Before the 1998 remedial investigation (Rl), several environmental investigations were performed on parts of the Site, including the former Ansonborough Homes, Calhoun Park (now the location of the on-site parking garage) and the Cooper River.4 In 1992, the Site received a Hazard Ranking System 4 Preliminary investigations conducted in the early 1990s for the former Ansonborough Homes property were used to inform the remedy selection process. As the property was included in initial investigations, it is considered part of the Site. However, Has the site achieved construction completion? Yes 3 ------- score sufficient for National Priorities List (NPL) listing, but listing was suspended based on cooperation by SCE&G (the PRP). Site cleanup was conducted under an alternative approach. In January 1993, SCE&G entered into an Administrative Order with the EPA to perform an Rl. Evaluation of human health risk associated with the Site is discussed in the 1994 Baseline Risk Assessment by Black & Veatch, the 1995 Assessment of Risk for the National Park Service Property by the EPA, and the 1996 Revision to the Risk Assessment by the EPA. For OU-1, the risk evaluation for commercial workers and future residential populations resulted in unacceptable risk levels associated with soil and groundwater. Risks under the construction worker and long-term worker scenarios were largely driven by incidental ingestion and/or dermal contact with surface and subsurface soils. The risk under the future resident scenario was driven primarily by exposure to shallow groundwater. For OU-2, the potential carcinogenic risks associated with exposure to intermediate groundwater by a hypothetical child or adult resident exceeded the EPA target cancer risk range. Similarly, potential noncarcinogenic risks associated with exposure to intermediate groundwater by a hypothetical child or adult resident exceeded a hazard index of 1.0. The risk from human exposure to sediment was not evaluated because human exposure to sediment was deemed unlikely. Sediment presented ecological risks from polycyclic aromatic hydrocarbons (PAHs) with hazard quotients (HQs) based on the EPA's equilibrium partitioning sediment guideline toxicity units (ESGTUs) above 1. At the time of the 2002 OU-2 Record of Decision (ROD), about 70 percent of the area with ESGTU HQs equal to or greater than 1 was covered by permanent structures and previously installed sand blankets, which reduced but did not eliminate the direct contact pathway for ecological exposures. Contaminants of concern (COCs) are included by media in Table 1 below. based on investigation findings, no remedy was selected for the former Ansonborough Homes property. Because preliminary investigations identified some contamination associated with former wood treating activities, SCDHEC manages the former Ansonborough Homes property under the authority of SCDHEC's Voluntary Cleanup Program. 4 ------- Table 1: COCs by Media COCs Media Arsenic Groundwater and Soil Benzo(a)pyrene Groundwater and Soil Cyanide Groundwater Benzene Groundwater 2,4-Dimethylphenol Groundwater Ethyl benzene Groundwater Beryllium Groundwater Lead Groundwater Carbazole Groundwater Mercury Groundwater Chrysene Groundwater Naphthalene Groundwater Chromium Groundwater Nickel Groundwater Copper Groundwater Toluene Groundwater Xylenes (total) Groundwater PAHs Sediment Sources: 1998 ROD Section 7.1. 1 and 7. 1.2 anc 2002 ROD Table 8-1 and Section 8.2 Response Actions Pre-ROD To support site redevelopment construction activities, several early cleanup actions were conducted before final remedy selection for OU-1. These actions included installing several sediment containment structures (such as sand blankets to minimize the resuspension of contaminated sediment during area redevelopment), addressing contaminated stormwater discharges (by upgrading a Calhoun Street storm drain that had been transporting contaminants from the Site to the Cooper River, resulting in contaminated sediment, and installing a subsurface sheet piling wall to prevent the new drain from acting as a preferential pathway for groundwater to the river), and investigating and responding to an oily sheen and seeps observed on the river at the end of Charlotte Street (by using absorbent booms and investigating the coal tar seeps). The 1998 OU-1 ROD includes additional details regarding those actions. Post-ROD The EPA selected the Site's remedies in the 1998 OU-1 ROD, the 2005 OU-1 Explanation of Significant Differences (ESD), and the 2002 OU-2 ROD. OU-1 addresses DNAPL source areas, shallow groundwater contamination and soil. The DNAPL source areas were identified as the 5 ------- former gas holder, the former rail spur, and the former oil tanks (see Figure E-2 in Appendix E for a historical site map). The DNAPL source areas are mostly in the shallow aquifer, though DNAPL is also observed in the intermediate aquifer. 6 ------- Operable Unit 1 The 1998 OU-1 ROD included the following remedial action objective (RAO) for soil: Ensure soil exposure concentration levels are adequately protective forfuture construction workers and long-term workers. The 1998 OU-1 ROD noted that the while the goal of the remedy is to restore groundwater to Maximum Contaminant Levels (MCLs), restoration to MCLs may be technically impracticable. Therefore, the ROD stated that the shallow groundwater/DNAPL remedy shall at a minimum achieve the following: Source areas: o Removal or treatment of DNAPL to the maximum extent practicable, o Containment of potentially non-restorable source areas. Shallow groundwater: o Restoration of aqueous contaminant plumes. The 1998 OU-1 ROD selected the following remedy: Excavation and transportation of contaminated soil to a permitted landfill followed by backfilling excavated areas with clean fill. DNAPLsource removal from the shallowand intermediate aquifers via an extraction system. • Treatment of the shallow groundwater plume through a combination of recovery wells/filtration system and phytoremediation. Additional sampling of surface water and sediment, following mitigation of coal tar discharge into the Cooper River, to fully delineate the extent of contamination and potential threat to aquatic and terrestrial life. The OU-1 ROD did not specify an anticipated timeframe for this remedy but did note that the full- scale groundwater/DNAPL remedy would be an iterative process that must be conducted for a sufficient period of time before its ability to meet applicable cleanup levels can be fully evaluated. Cleanup goals for OU-1 shallow groundwater are included in Table 2. 7 ------- Table 2:1993 ROD Established Remediation Goals for OU-1 Shallow Groundwater COC 1998 ROD Cleanup Goal fme/L) Arsenic 0.05 Benzene 0.005 Benzo(a)pyrene 0.00023 Beryllium 0.004 Carbazole 0.005b Chromium 0.1 Chrysene 0.020c Copper 1.3 Cyanide 0.2 2,4-Dimethyl phenol 0.7b Ethylbenzene 0.7 Lead 0.015 Mercury 0.002 Naphthalene 1.5b Nickel 0.1 Toluene 1.0 Notes: Source: 1998 OU-1 ROD Section 7.1.2 a. Represents PAHs as a group. b. Based on actual risk calculation rather than MCLs. c. The ROD cleanup goal for chrysene was 0.02 mg/L, but the June 2018 Shallow Groundwater Monitoring Report notes that the chrysene cleanup goal was changed to 0.2 mg/L and that this was approved in a SCDHEC letter dated May 23, 2002. mg/L = milligrams per liter 8 ------- Preliminary Remedial Goals (PRGs) included in the 1998 OU-1 ROD for soil are included in Table 3 below. Table 3:1998 OU-1 ROD Soil PRGs Soil COC 1998 ROD PRG (mg/kg)' Arsenic 7.6 Benzo(a)pyrene (EQ)b 1.7 Notes: Source: 1998 OUI ROD Section 7.1.1 a. These values were based on data presented in the risk assessment. The PRGs are not the concentrations above which all soils should be remediated. The PRGs are based upon the Upper Confidence Limits (UCL) in the same manner as the risk assessment used UCL in calculating the soil exposure point concentrations for determining overall site risk. b. EQ = Toxicity Equivalents. The toxicity associated with benzo(a)pyrene is used as a point of reference for other carcinogenic PAHs. mg/kg = milligrams per kilogram During remedy implementation, three additional source areas were found: a former wood treating operation, depositional areas around the former steam plant, and the discharge outfall of the former oil-water separator. See Figure E-2 in Appendix E for a historical site map. The EPA determined that performance standards could be achieved by methods other than those prescribed in the original ROD for all the Site's source areas. In 2005, the EPA modified the original OU-1 remedy in an ESD. The modified remedy included excavation of DNAPL source areas and installation of a perimeter DNAPL collection trench with over 50 recovery wells. The modified remedy also specified mixing chemical oxidants into the soil used to backfill the excavated areas and spot injections of oxidation products to address shallow groundwater contaminated by source material that was inaccessible for excavation. Operable Unit 2 OU-2 addresses intermediate groundwater, DNAPL in the intermediate sand unit that affects intermediate groundwater, sediment, and surface water. The 2002 OU-2 ROD determined that surface water required no additional action to protect public health and the environment because of previous response actions. The 2002 OU-2 ROD included the following RAOs: Intermediate groundwater: o Removal or treatment of DNAPL to the maximum extent practicable, o Containment of potentially non-restorable source areas, o Restoration of aqueous constituent plumes. o Prevent exposure to groundwater having concentrations above acceptable risk levels. Sediment: o Prevent exposure of benthic organisms to impacted sediment, o Prevent the volume of PAH-contaminated sediment from increasing. 9 ------- o Reduce the volume of PAH-contaminated sediment. o Prevent the erosion and provide for the long-term stability (reduce mobility) of impacted sediments. 10 ------- The 2002 OU-2 ROD included the following remedial components: DNAPL removal to the extent practicable using either stationary or portable pumping equipment and transportation of recovered DNAPL off site for reuse or treatment and disposal. In-situ treatment of contaminated groundwater in the intermediate zone, using increasing dissolved oxygen concentrations to stimulate microbial activity and biodegradation, or the direct destruction of dissolved constituents via chemical oxidation. Groundwater monitoring in the contaminated part of the intermediate zone and at sentinel well locations. Restrictions to future uses of intermediate groundwater on SCE&G property through a deed notification. Evaluation of containment measures if DNAPL removal and institutional measures do not help prevent migration of dissolved phase constituents. Monitoring of existing sand blankets at the perimeter of existing structures and along the west bank of the Cooper River. Maintenance of the existing sand blankets, if required, and augmentation of the sand blankets depending on supplemental total organic carbon and PAH data collected during the remedial design. The 2002 OU-2 ROD estimated a five-year DNAPL recovery period and a 12-year intermediate groundwater monitoring period. Cleanup goals for OU-2 intermediate groundwater are included below in Table 4. Table 4: 2002 OU-2 ROD Intermediate Groundwater COC Cleanup Goals Intermediate Groundwater Groundwater COC 2002 OU-2 ROD Cleanup Goal (mg/L) Benzene 0.005 Benzo(a)pyrene 0.0002 Carbazole 0.005a 2,4-Dimethylphenol 0.7a Ethyl benzene 0.7 Naphthalene 1.5a Toluene 1.0 Xylenes (total) 10.0 Notes: Source: 2002 OU-2 ROD Table 8-1 a. Indicates cleanup goals derived from risk-based calculations, rather than drinking water standards (MCLs). mg/L = milligrams per liter 11 ------- The 2002 OU-2 ROD stated that the remedial goal for contaminated sediments was to address PAH- contaminated sediments with ESGTU HQs that were greater than 1. Status of Implementation Operable Unit 1 Soil SCE&G completed the soil and source material excavation in eight phases from August 1998 through November 2004, with soil management and disposal activities extending to the end of 2005. This included removal of about 63,400 tons of contaminated soil, sediment, coal tar, and debris. Soil was removed from the following areas to be protective of future commercial and construction workers: substation, parking garage, NPS and Luden's Marine properties. Contaminated material was sent off site for recycling or disposal. Excavated areas were backfilled. As noted in the 2005 ESD, additional source material and soil removal activities were completed during the OU-1 remedy implementation because additional source areas were discovered; and it was determined that the performance standards could be achieved using alternate methods described below. Concurrent with the sitewide redevelopment, a significant volume of DNAPL was removed during the soil excavation described above (the original remedy prescribed DNAPL recovery via an extraction system). There were some areas inaccessible for excavation, including the former gas holder source area, which is located within the electrical substation. The substation and other existing site features (i.e., underground utilities and structures) created obstacles to removing DNAPL. Additional steps were taken to address DNAPL in inaccessible areas, including installation of a perimeter collection trench with over 50 DNAPL recovery wells and mixing chemical oxidants into the soil used to backfill the excavated areas and spot injections of oxidation products. See below for more information on the DNAPL recovery. Lastly, due to the Site's proximity to the Cooper River and the shallow water table, groundwater collection, storage and disposal was necessary during soil excavation. During excavation activities, over 3,000,000 gallons of water were removed and transferred to approved treatment facilities. These source material removal activities contributed significantly toward achieving other remedial objectives. DNAPL The following DNAPL source areas were remediated by excavation: depositional areas around the former steam plant, the former wood treating operation, the former rail spur, and the former oil tank. The discharge outfall of the former oil-water separator received oxidant injections. As documented by the 2005 ESD, a collection trench was installed with over 50 recovery wells around the former rail spur and former oil tank source areas to increase the overall effectiveness of the remedy by recovering DNAPL via the trench. See Appendix L, Figure L-l for the location of the trench segments. DNAPL recovery activities also include automated recovery from DRW-06 in the former gas holder source area and recovery from groundwater monitoring wells and other 12 ------- DRW wells where DNAPL typically accumulates. DNAPL removal began in October 1998 and is ongoing. See the Data Review section of this FYR for more information. Shallow Groundwater Fortreatment of the groundwater plume, a combined approach was used that included: • Installation and operation of DNAPL recovery wells. • Removal and treatment at approved treatment facilities of over 3,000,000 gallons of water resulting from excavation and construction activities. • Amending backfill with commercially available oxidants. • Point source injection of commercially available oxidants. • Phytoremediation. • Routine groundwater monitoring. As documented in the 2005 ESD, oxidation products were introduced into the subsurface soil and shallowgroundwater by amending excavation backfill material and conducting spot injections, aiming to enhance bioremediation. Areas with enhanced backfill and shallow injections are shown on Figure E-2 in Appendix E; the areas with enhanced backfill include the former wood treating operation and former steam plant deposition source areas. In the early 2000s, injections occurred in the following source areas: the former rail spur, former wood treating operation and the discharge outfall of the former oil-water separator. The United States Geological Survey (USGS) and SCE&G implemented phytoremediation (the treatment of environmental contamination using plants) at the Site. Trees planted by SCE&G uptake contaminated groundwater. The 2009 FYR estimated 105,000 gallons of contaminated groundwater are taken up over an eight-month growing season. Benzene, toluene, naphthalene, and other coal tar-related PAHs have been detected in tree tissue samples. DNAPL recovery and groundwater monitoring are ongoing; see the Data Review section of this FYR for more information. Additional Sampling The OU-1 remedy required that after coal tar discharge to the Cooper River is stopped, surface water and sediment be sampled to delineate the extent of contamination. Seep mitigation activities along Charlotte Street concluded in April 1999 and included excavation of 1,542 tons of soil/sediment and debris and placement of a sand blanket over the excavated area. Operable Unit 2 Intermediate Groundwater Two DNAPL recovery wells (DRW-52C and DRW-53C) were installed on site to provide additional locations in the intermediate unit; DNAPL removal from various intermediate wells is ongoing. In- 13 ------- situ groundwater treatment was conducted via the addition of chemical oxidants to treat dissolved phase contaminants either biologically or through chemical destruction. The two chemical oxidants (PermeOx® Plus or EHC-O™, and Fenton's reagent) were selected during the design phase based on accessibility, extent, estimated constituent mass and regulatory requests. Injections occurred from May 2005 to September 2006. Injection areas are depicted on Figures K-6 and K-7 in Appendix K. Post- remedial groundwater sampling continues to monitor intermediate groundwater; see the Data Review section of this FYR for an assessment of the effectiveness of these injections. Sediment Sediment was contaminated from the former Charlotte Street seep area and the former Calhoun Street drain outfall. Before area redevelopment, a protective sand layer at least 2 feet thick was installed. The OU-2 ROD sediment remedy called for monitoring, maintenance, and augmentation (if needed) of existing sand blankets: Regulatory agencies later approved use of more stable and permanent capping materials than the sand in place (i.e., concrete mats and stone riprap). The additional sediment remediation work was divided into three areas (Areas 1, 2 and 3) along the western bank of the Cooper River, as shown in Figure 1, page 13. Area 1 is at the end of Charlotte Street Park underneath an observation platform. Area 2 is between the South Carolina Aquarium and the NPS Tour Boat Facility. Area 3 is south of the NPS Tour Boat Facility. Generally, contaminated sediment in these areas were capped near the shoreline where the existing sand blanket may not have been thick enough to prevent exposure of benthic organisms to contaminated sediment. The 2013 sediment remedial action report stated that because of the stability and permanence of the capping materials installed and with completion of development activities along the adjacent riverside property, no further monitoring or inspection of the capped areas is required. The 2013 sediment remedial action report also noted that if future development, construction, or other activities warrant disturbing or modifying the capping materials, SCE&G and the agencies will be notified by the landowners and appropriate measures will be taken to ensure that the sediment remediation measures remain intact. Several supplemental sediment-related activities were also conducted during the remedial action; while not specified in the ROD, they were completed as part of the sediment capping activities described in the work plan. These activities included extending an existing oyster research study area near the aquarium and regrading a small sand mound west of the oyster study area (to mitigate a "scouring effect" the sand mound had on the oyster study area). This included placement of bagged oyster shells north and south of the existing research area. Construction for the caps over Areas 2 and 3 occurred in July and August 2006. For Area 1, SCE&G and the City worked together on capping so it could be conducted in conjunction with the planned construction of a city park at the end of Charlotte Street, as Charleston had plans to develop an observation platform extending out over the river and covering most of Area 1. The city park construction was delayed for several years due to technical and budgetary constraints, so the Area 1 remedial activities were completed in two phases. The first phase (sand blanket installation) was conducted in March 2010 and the second phase (geotextile and riprap installation) was completed 14 ------- in December 2012. The City's construction of the observation platform was completed in June 2013. Institutional Controls HC) The OU-2 ROD called for institutional controls restricting future uses of intermediate groundwater on the SCE&G property (now DESC). Institutional controls were implemented for the SCE&G property in September 2018 via a Declaration of Covenants and Restrictions. This institutional control prohibits consumptive groundwater use; prohibits use of the property that interferes with remediation; precludes residential, agricultural, day care, school, or elder care facilities, or recreational uses; prohibits non-remedial well drilling; and precludes soil excavation without EPA approval. Decision documents do not require institutional controls for soil, but they are in place on the DESC property as noted above. No institutional controls are in place for soil on other site properties, but they do not appear to be needed as the cleanup of those areas has been completed and the soil cleanup goals (listed in Table 3) are protective of a residential exposure scenario. See Appendices H and I for more detail. The former DNAPL source area located at the discharge outfall of the former oil-water separator is outside of the institutional control area on the substation property. However, that source was remediated with oxidant injections; therefore, land use restrictions for the area are not required.5 While institutional controls for groundwater were called for and have been implemented on the substation property, contaminated groundwater is present outside of this property. Part of the Charleston City Code; Chapter 7, Article IV, Division 2, Section 7-91(Ord. No. 2010-110, § 1, 7-20- 10), acts as an institutional control because it includes a requirement that dwelling structures must have fresh water from a SCDHEC approved well or from a public water system supplied to the individual building through an onsite water meter.6 This city ordinance provides protection against use of contaminated groundwater. In addition, groundwater quality in the site vicinity is brackish and unsuitable for human consumption. Decision documents also do not require institutional controls for sediment, though contamination beneath the capped areas could potentially pose risks to ecological receptors. Implementation of conventional institutional controls on riparian properties presents a wide range of challenges and is often deemed infeasible. To ensure the long-term integrity of the caps, DESC (or its subcontractor) visually inspects the sediment caps during routine Operation and Maintenance (O&M) activities. As the sediment caps are located within a public waterway, no work of any kind can be performed in those areas without first obtaining prior permission and required permits from several 5 While not required by the remedy, prior to any digging in the vicinity of the discharge outfall of the former oil-water separator, the property owner must notify the South Carolina 811 utility locating service to ensure that any excavation does not disrupt underground utilities and to ensure that the work is performed in accordance with local regulations. 6 Accessed 1/2/2024 at https://librarv.municode.com/sc/charleston/codes/code of ordinances?nodeId=COCHSOCA 15 ------- regulatory agencies. That requirement acts as an institutional control that prevents activities that could potentially impact the integrity of the sediment caps. For the ICs to be enforceable, the decision document(s) should be modified to include land use restrictions for all media of concern. For this Site, provisions for land use restrictions should be added to the decision document(s) for soils and the sediments. Appendix O includes a copy of the deed restrictions for parcels 4591304002, Tract C-l (a portion of parcel 4580102063), Tracts A2-1 (a portion of parcel 4580102028), and A2-2 (a portion of parcel 4580102064). Figure 1 shows the extent of ICs at the Site. 16 ------- IC Summary Table Table 5: Summary of Planned and/or Implemented Institutional Controls Media, Engineered Controls and Areas that Do not Support UU/UE Based on Current Conditions ICs Needed ICs Called for in the Decision Documents Impacted Parcells)3 IC Objective Instrument in Place Soil Yes No 4591304002 (DESC) Prevent land use that interferes with remediation and prevent exposure to remaining contamination/DNAPL 2018 Declaration of Covenants and Restrictions Groundwater Yes Yes 4591304002 (DESC) Restrict future uses of intermediate groundwater on the SCE&G property 2018 Declaration of Covenants and Restrictions Groundwater Yes Yes 4590000006 4590000167 4590000166 4590000157 4591304001 4580102028 4580102062 4580102027 Restrict city-wide use of groundwater Ord. No. 2010-110, § 1, 7-20-10 4580102067 4580102064 Restricts use of groundwater on property VCC 08-5754-NRP RB Charleston LLC Declaration of Covenants and Restriction Sediment Yes No See Figure 1, Page 15 Ensure the long-term integrity of the caps in order to prevent ecological exposure to contaminated sediment None 17 ------- '• [. r"-»S U ; S.;dM $Z \|\| I ' -.jJ. 7 ®V Jf% P, , ^Ml§> &es»»Kx -j •- ««-««» Feet Sources: Charleston County GIS Viewer (https://gisccweb.charIestoncounty.org/public_search/); Declaration of Covenants and Restrictions Calhoun Park ArealTract C Affordable Housing, 0.42 acres Charleston County, SC; Statements of Maintenance of the Declaration of Covenants and Restrictions (one for Tract A2-1 and one for Tract A2-2, each located at approximately 7 Calhoun Street in Charleston). Annual Statement; Maintenance of the Declaration of Covenants and Restrictions Portion of the Calhoun Park Area Site in Charleston County, SC, New Tract C-l a Portion of TMS No.458-01-02-063; 2013 OU-2 Sediment Remedial Action Report Legend Approximate Site Boundary Parcel under 2018 Declaration of Covenants & Restrictions Parcels IJntler Declaration of Covenants and Restrictions (Tract [ A2-1 & A2-2) Parcels Under Declaration of Covenants and Restrictions Calhoun Park Area/Tract C Affordable Housing Declaration of Covenants and Restrictions Portion of the Calhoun Park Area Site, New Tract C-l a Portion of TMS No.458-01-02-063 Approximate Sediment Caps Approximate Oyster Research Bed Area i. ? t TPdhec Healthy People. Hcaltr.y Co(T\rnuiuu«j£. Calhoun Park Area Superfund Site Charleston, Charleston County, South Carolina Figure 1: Institutional Controls Map (Disclaimer - This map and any boundary lines within the map are approximate and subject to change. The map is not a survey. The map is for informational purposes only regarding the EPA's response actions at the Site.) 18 ------- Systems Operations/Operation and Maintenance fO&M) DNAPL recovery and groundwater monitoring are ongoing; these are explained in further detail in the Data Review section of this FYR. Intermediate groundwater monitoring is performed in accordance with 2007 Revised Technical Memorandum #003 and subsequent modifications. Shallow groundwater monitoring and subsequent modifications are performed in accordance with the 2007 Technical Memorandum #001. DESC submits shallow and intermediate groundwater monitoring reports following each event to the EPA and SCDHEC. In 2010, the site O&M personnel staffing was changed to a 2-week on and 1-week off schedule, which has been effective in maximizing available DNAPL removal (by allowing for DNAPL recharge) while reducing labor and overall site costs. Recovered DNAPL is contained in 55-gallon drums and temporarily stored onsite in a secured, restricted access and monitored electrical substation facility. Currently, the DNAPL drums transported to an approved facility for recycling via fuel blending at a cement kiln. From August 2019 to June 2021, 98 drums were transported to Tradebe Environmental Services recycling facility. From March 2022 to January 2023, 93 drums were transported to Giant Resource Recovery recycling facility. Wastewater generated onsite from O&M activities is stored in an on-site storage tank for future disposal. DESC submits DNAPL removal reports semiannually to the EPA and SCDHEC. Maintenance is conducted as needed. O&M is not required for soil cleanup areas, phytoremediation trees or sediment caps. The 2013 sediment remedial action report stated that because of the stability and permanence of the capping materials installed and with the completion of development activities along the adjacent riverside property; no further monitoring or inspection of the capped areas is required. III. PROGRESS SINCE THE LAST REVIEW This section includes the protectiveness determination and statement from the previous FYR Report (Table 6) as well as the recommendations from the previous FYR Report and the status of those recommendations (Table 7). 19 ------- Table 6: Protectiveness Determination/Statements from 2019 FYR ou# Protectiveness Determination Protectiveness Statement OU-1 Short-term Protective The remedy at OU-1 currently protects human health and the environment because contaminated soil was excavated and disposed of off-site, DNAPL was removed during excavation and continues to be removed via ongoing DNAPL recovery, shallow groundwater monitoring and phytoremediation are ongoing, bioremediation products were put in backfill and injected into the subsurface, and institutional controls are in place to prevent exposure to contaminated groundwater. However, in order for the remedy to be protective over the long- term, the following action needs to be taken: • Evaluate whether naphthalene and 2,4-dimethylphenol groundwater cleanup goals warrant updating to reflect appropriate risk levels. • Evaluate whether the new chrysene groundwater cleanup goal should be updated in a decision document. • Officially document the need for institutional controls forthe substation property soil, for site-related groundwater contamination outside of the substation property and forthe sediment caps. • Ensure the detection limit is low enough to assess achievement of the benzo(a)pyrene groundwater cleanup goal. OU-2 Short-term Protective The remedy at OU-2 currently protects human health and the environment because contaminated sediment was capped, intermediate groundwater monitoring is ongoing, bioremediation products were put in backfill and injected into the subsurface, and institutional controls are in place to prevent exposure to contaminated groundwater, ensure the long-term integrity of the sediment caps and to prohibit activities that could potentially disturb the caps. However, in order for the remedy to be protective over the long-term, the following action needs to be taken: • Evaluate whether naphthalene and 2,4-dimethylphenol groundwater cleanup goals warrant updating to reflect appropriate risk levels. • Officially document the need for institutional controls forthe substation property soil, for site-related groundwater contamination outside of the substation property and for the sediment caps. Ensure the detection limit is low enough to assess achievement of the benzo(a)pyrene groundwater cleanup goal. Sitewide Short-term Protective Because the remedies for OU-1 and OU-2 are protective in the short term, the sitewide remedy is protective in the short term. For the sitewide remedy to be protective over the long term, the issues identified for OU-1 and OU-2 need to be addressed. 20 ------- Table 7: Status of Recommendations from 2019 FYR ou# Issue Recommendations Current Status Current Implementation Status Description Completion Date (if applicable) OU-1 OU-2 The groundwater cleanup goals for naphthalene and 2,4-dimethylphenol do not correspond to risks within the EPA's acceptable risk range. Evaluate whether naphthalene and 2,4- dimethylphenol groundwater cleanup goals warrant updating to reflect appropriate risk levels. Considered But Not Implemented The current cleanup goal for 2,4-dimethylphenol is protective, as the majority of monitoring well locations sampled below the RSL value as well as the cleanup level. The site is considered short-term protective with groundwater ICs in place. 1/25/2024 Ongoing The current cleanup goal for naphthalene was compared to current the RSL. The RSL was then compared to the Site's monitoring results. Based on monitoring results, an updated cleanup goal for naphthalene should be considered. N/A OU-1 The chrysene cleanup goal was changed from the 1998 OU-1 ROD'S value of 20 \|ig/L to 200 \|ig/L; this was approved in a 2002 SCDHEC letter. This cleanup goal change does not appear to have been documented in a formal EPA document. Evaluate whether the new chrysene groundwater cleanup goal should be updated in a decision document. Ongoing Ongoing N/A OU-1 OU-2 There is no remedial requirement for institutional controls for the substation property soil, for site-related groundwater contamination outside of the substation property or for the sediment caps. Officially document the need for institutional controls for the substation property soil, for site-related groundwater contamination outside of the substation property and for the sediment caps. Considered But Not Implemented Considered But Not Implemented N/A OU-1 OU-2 The detection limit used for benzo(a)pyrene is above its established groundwater cleanup goal. Ensure the detection limit is low enough to assess achievement of the benzo(a)pyrene groundwater cleanup goal. Completed Method SW846 8270D with a reporting limit of 0.20 \|ig/L and a method detection limit of 0.085 \|ig/L for benzo(a)pyrene was implemented for groundwater analytical results. 4/1/2020 21 ------- Other Findings Six additional recommendations were identified during the 2019 FYR. These recommendations did not affect current and/or future protectiveness. Update the site repository with recent documents. • In groundwater monitoring reports, clearly distinguish between groundwater contaminant concentrations that are below laboratory reporting limits and those that were below laboratory minimum detection limits or "non-detect". Continue to closely monitor COC concentrations and DNAPL at sentinel well LM-10AR. If COC concentrations continue to increase, or if DNAPL increases at well LM-10AR, additional evaluation of that area may be warranted. Consider groundwater monitoring program optimization suggestions from SCE&G. Consider mapping plumes in groundwater monitoring reports. Consider formally documenting the decision to remove nickel, beryllium, lead, mercury, chromium, copper, and arsenic from the list of shallow groundwater COCs. The following provides updates for each Finding: Update the site repository with recent documents. The EPA will transfer the local information repository to an online format, allowing the EPA to make information available to the public more efficiently and conveniently. The local library that serves as the current repository can provide internet access to the community via the publicly available computers. Clearly distinguish between groundwater contaminant concentrations that are below laboratory reporting limits (RLs) and those that were below laboratory minimum detection limits (MDLs) or "non- detect". Groundwater reports have been changed to clearly distinguish between RLs and MDLs. Closely monitor COC concentrations and DNAPL at sentinel well LM-10AR. If COC concentrations continue to increase, or if DNAPL increases at well LM-10AR. additional evaluation of that area may be warranted. Sentinel well LM-10AR has continued to be monitored. Benzo(a)pyrene decreased from 40.0 pig/L in 2020 to 8.0 pig/L in 2022. The relatively low levels of PAHs detected in LM-10AR samples are attributed to the continued presence of residual DNAPL in the vicinity of the wells. Consider groundwater monitoring program optimization suggestions from SCE&G. Groundwater monitoring program optimization suggestions were considered and implemented as needed. Consider mapping plumes in groundwater monitoring reports. Groundwater plumes are now included in groundwater monitoring report. 22 ------- Consider formally documenting the decision to remove nickel, beryllium, lead, mercury, chromium, copper, and arsenic from the list of shallow groundwater COCs. The formal documentation recording the decision to remove nickel, beryllium, lead, mercury, chromium, copper, and arsenic from the list of shallow groundwater COCs is under review by the EPA and SCDHEC. IV. FIVE-YEAR REVIEW PROCESS Community Notification. Involvement & Site Interviews On October 19, 2023, the EPA issued a press release, which announced that comprehensive reviews will be conducted of completed cleanup work at NPL Superfund sites in the Southeast, including the Calhoun Park Area Site. Appendix F contains a copy of the EPA News Release. A copy of the FYR report will be made available on the EPA website: https://www.epa.gov/superfund/superfund-five-year- reviews. During the FYR process, interviews were conducted to document any perceived problems or successes with the remedy that has been implemented to date. The interviews are summarized below and included in full in Appendix F. Tom Effinger (DESC) stated that DESC has and continues to remediate various site media while maintaining the safe operation of a critically important electrical substation. He noted that integrating site remediation with redevelopment allowed remediation during other construction activities, which supported property improvements for the surrounding community. Mr. Effinger said the completed and ongoing remedial activities continue to be protective of the environment, practical (given site limitations), and cost-effective. He said that DNAPL continues to be removed (over 52,000 gallons and continuing) and elevated groundwater constituents continue to attenuate as a result. He also noted that optimization for the shallow and intermediate groundwater monitoring and reporting and routine quarterly reports is being discussed with state and federal agencies. Rusty Contrael (Ace, Inc.), stated that cleanup has been completed to the maximum extent practicable given the logistical and geological challenges encountered at this Site. Mr. Contrael stated the remedy is functioning as intended, DNAPL and contaminated groundwater are not migrating, and O&M activities continue to be efficient and cost-effective. The potential for Site reuse has been maximized. The site was awarded the "Excellence in Site Reuse" from the EPA in 2012. The shallow groundwater monitoring program was reduced from a 9-month to an annual sampling interval. The change also included sampling of the sentinel wells on a biennial basis (i.e. every other year). The changes have resulted in cost savings and improved efficiency of the overall remedy. Similar optimizations/reductions have been proposed and implemented for the intermediate groundwater monitoring program. Mr. Contrael recommends that wells at the Site that are no longer essential to the monitoring programs be properly abandoned. Additionally, the current groundwater monitoring programs should 23 ------- be evaluated and recommendations to reduce sampling frequencies, locations and constituents may be warranted. Sara Callahan, the project manager with SCDHEC stated that the Site remediation is progressing at an acceptable rate. The hydrology/geology of the Site is well understood, and the groundwater contaminant plume is well defined as is the DNAPL. Current land uses at the site include commercial and residential buildings, continued utility services, public and educational services, recreational and cultural attractions, and ecological projects. Data Review The data collected during this FYR period include DNAPL recovery volumes and shallow and intermediate groundwater monitoring. DNAPL Recovery Manual DNAPL extraction continues to remove DNAPL from the subsurface. A total of 52,113 gallons of DNAPL have been removed from October 1998 to May 2023. Removal occurs via DNAPL recovery wells located in excavated collection trenches, automated recovery from DRW-06 located in the former gas holder, and recovery from groundwater monitoring wells and other DRW wells where DNAPL typically accumulates.7 The DNAPL trench, recovery wells, recovery segments, and recovery volumes by segment are included in Appendix L, Figure L-l. Over the last five years, the highest volumes of DNAPL recovered were from segment 7. Segment 7 includes DRW-06, which is in the former gas holder, a main DNAPL source area that cannot be excavated. Starting in 2014, the recovered DNAPL volume increased an order of magnitude in segment 7 (Appendix L, Figure L-l). From 2014 through 2022, the recovered DNAPL volume per year in segment 7 has shown an increasing trend from 1,634.0 gallons in 2014 to 2,526.3 gallons in 2022. For 2023, the recovered DNAPL volume per year in segment 7 dropped to 1,473.6 gallons, the lowest recovered DNAPL volume per year in 9 years. Except for segment 7, the recovered DNAPL volumes indicate a downward trend when comparing this FYR period's volumes to historical data. The lowest recovered DNAPL volume per year in all segments was in 2023. Aside from segment 7, the recovered DNAPL volume per year was at least half again lower in 2023 than in 2022 (Appendix L, Tables L-l, L-4, and L-18, Figures L-l, L-2, L-5, L-6, L-8, and L-9). Shallow Groundwater Shallow groundwater is monitored to assess the restoration of the aquifer and evaluate the potential for contaminant migration. Originally, the shallow groundwater sampling program involved sampling a total of 15 monitoring wells with six designated as sentinel locations and nine as aqueous plume monitoring wells. In December 2007, two wells (MW-12A and DRW-03) were eliminated with the EPA and SCDHEC concurrence. From December 2007 to June 2018, thirteen 7 The bottom of the former gasholder is on clay that is believed to provide a low hydraulic conductivity layer. 24 ------- monitoring wells (five sentinel and eight aqueous plume) were included in the shallow groundwater sampling program. The June 2018 Shallow Groundwater Monitoring Results Report (Apex, October 2018) recommended to reduce the sampling frequency of the aqueous plume wells to annual and the sentinel wells to biennial (i.e., every other year), re-designate well MW-14 (previously an aqueous plume well) as a sentinel well, and remove seven PAH parameters from the analytical program. Regulatory approval of the proposed changes was provided in a letter dated January 9, 2019. Beginning with the April 2019 monitoring event, six sentinel wells and seven aqueous plume wells were sampled as part of the shallow groundwater sampling program (Appendix J, Figure J-l). The April 2019 Shallow Groundwater Monitoring Results Report (Apex, September 2019) recommended reducing the number of groundwater level measurements from 75 to 39 wells. SCDHEC approval to eliminate 26 of the proposed 36 wells was provided in a letter dated November 4, 2019. Beginning with the April 2019 event, sampling is performed annually for the aqueous plume wells. The sentinel wells are sampled biennially with the first biennial event in April 2022. The monitoring events include groundwater level and DNAPL occurrence measurements. Groundwater sampling is performed using modified low flow techniques. The parameters analyzed include benzene, toluene, ethylbenzene, total xylenes (BTEX), semi-volatile organic compounds (SVOCs) comprised of nine polynuclear aromatic hydrocarbons (PAHs), carbazole, 2,4-dimethylphenol, and cyanide. Sentinel Wells BTEX was not detected in the six sentinel wells (DW-04, LM-03A, LM-10AR, MW-07AR, MW-14 and MW-33). In the 2020 shallow groundwater sampling event, PAHs were detected in two sentinel wells, LM-10AR and MW-14. LM-10AR had five PAHs detected at concentrations ranging from 12.5 ng/L (anthracene) to 75.1 ng/L (fluoranthene). Only benzo(a)pyrene detected at 40.0 [ig/L exceeded its cleanup goal. Acenaphthene (0.26 [ig/L) and fluorene (10.5 [ig/L) were detected in MW-14. Neither detection exceeded their cleanup goals. In the 2022 shallow groundwater sampling event, PAHs were detected in a single sentinel well, LM-10AR. The only PAH detected above its cleanup goal was benzo(a)pyrene at 8.0 ng/L. The relatively low levels of PAHs that were detected in LM-10AR and MW-14 samples are attributed to the continued presence of residual DNAPL in the vicinity of the wells. Cyanide was not detected in any sentinel well during the 2020 shallow groundwater sampling event. Cyanide was detected in four of the six sentinel well samples during the 2022 shallow groundwater sampling event at concentrations ranging from 0.005 to 0.0095 mg/L. All detections were at or within two times the RL, and cyanide was also detected at a low level in the equipment blank. These results are well below the cleanup goal and were not considered significant. Aqueous Plume Wells The aqueous plume wells monitor contamination trends in the shallow aquifer. These wells are located near the former gas holder on the substation property (MZ-02AR, MM-02A and MM-03A), near the former steam power plant/Luden's Marine (LM-02A and LM-01AR) and near the former oil/water separator discharge (MRW-01, MRW-02and MW-14). Since December 2010, benzene has 25 ------- not been detected in the aqueous plume wells LM-02A and MRW-02. Benzene cleanup goal exceedances in the other aqueous plume wells are summarized in Table J-3 in Appendix J. The highest benzene exceedance over the past five years was in well MM-03A with a concentration of 1080 ng/L. Concentrations fluctuated by up to a single order of magnitude during thisFYR period, which is consistent with historical data (Appendix J, Figure J-2). Since September 2014, naphthalene was not detected in samples from four (LM-02A, MM-02A, MRW-02, and MZ-02AR) of the eight aqueous plume wells. Naphthalene was detected but did not exceed the cleanup goal in wells LM-01AR and MRW-01. The only naphthalene exceedance above the cleanup goal of 1,500 ng/L in the last five years was observed in well MM-03A with a concentration of 6,130 ng/L in April 2019. Over the past five years the highest cumulative BTEX and PAHs concentrations have generally been detected in wells MRW-01, MM-03A and LM-0IAR. Cyanide has been detected above the 0.2 milligram per liter (mg/L) cleanup goal in every monitoring event in this FYR period. These exceedances have occurred in wells LM-0IAR and MM-03A. Intermediate Groundwater The current intermediate groundwater monitoring program was developed to provide data to demonstrate the long-term effectiveness of the in-situ chemical oxidation treatment areas and plume stability via natural attenuation processes at other areas of the Site. The OU-2 ROD estimated that based on in-situ treatment benefits, the total duration of intermediate groundwater monitoring would be 12 years, which has now been exceeded (injections occurred in 2005 and 2006, which is 19 to 20 years ago). Groundwater samples were collected from 9 to 12 (depending on the event) intermediate monitoring wells during this FYR period (Appendix K, Figure K-l). The intermediate sand unit is split into upper, middle, and lower sections. Groundwater is sampled annually and analyzed for BTEX and SVOCs. The SVOCs consists of carbazole and two PAHs, specifically naphthalene and benzo(a)pyrene. See Figures K-2 through K-4in Appendix Kfor historical benzene and naphthalene results in the upper, middle, and lower intermediatesand units relative to the in-situ chemical oxidation treatment areas. Intermediate groundwater monitoring data from this FYR period are included in Table K-3 in Appendix K. Upper Intermediate Sand Unit A total of four upper intermediate sand unit wells were sampled during this FYR period. For discussion purposes, the upper intermediate sand unit wells are grouped into two separate categories and include: • Fenton's Reagent Treatment Area; and • Natural Attenuation Areas. 26 ------- Upper intermediate well BM-03D is located in the area previously treated with Fenton's reagent. Wells PAMW-02, BM-04D, and MM-13C are located in the natural attenuation area of dissolved phase constituents is being monitored. The well locations and historical benzene and naphthalene results are shown on Figures K-l, K-2, K-3, K-4, and Table K-3 in Appendix K. Fenton's Reagent Treatment Area (BM-03D) The initial Fenton's reagent treatment occurred in 2005 with a follow-up polish treatment in 2006 at locations west of Washington Street on Rabin's and East Bay (BM-03D) properties. BM-03D groundwater analytical results over the past five years are shown in Appendix K, Figure K-2 and Table K-3 and indicate the following: • Benzo(a)pyrene was not detected above the RL; • Benzene, ethylbenzene and naphthalene were detected within their historical ranges, with each above their respective cleanup goals; • Carbazole highest detection of 7.7 pig/L occurred in 2020 and was detected slightly above the cleanup goal (5 ng/L); • Toluene (67.8 J pig/L in 2022) was detected below the cleanup goal, with the past four monitoring results being the four lowest concentrations; and • Total xylenes, ranging from 434 pig/L in 2019 to 624 J pig/L 2022, was detected below the cleanup goal. The trend over the past 5 years has been slowly increasing, however the concentrations show a decreasing trend over the life of the project. Natural Attenuation Areas (PAMW-02. BM-04D. and MM-13C) PAMW-02 is located on the SCSPA property as shown in Appendix K, Figure K-2. This area was previously treated by injecting PermeOx® Plus and EHC-O™ in 2005. Since March 2012, only benzene has been detected and the other constituents analyzed have not been detected above the RL. Over this time, benzene has not been detected above the RL in six of fourteen events. Attenuation is demonstrated via benzene since concentrations have decreased from a maximum of 18,000 ng/L (September 2006) to low (less than 65 ng/L) to not detected above the RL from December 2012 through June 2017. Following detection at comparatively higher concentrations in samples collected in March through December 2019, benzene has been at low to not detected above the RL for the past three monitoring events. Table K-3 in Appendix K provides the data. BM-04D is located on the north side of Charlotte Street and north of the former gasholder (Appendix K; Figures K-l and K-2). The BM- 04D December 2022 analytical results indicate: • The benzene concentration has increased over the past five years from 9,450 \|ig/L in 2019 to 19,500 ng/L in 2022. Concentrations continue to be above the cleanup goal of 5.0 ng/L and is the highest since the September 2016 event; • The ethylbenzene concentration has increased over the past five years from 747 \|ig/L in 2019 to 1,070 \|ig/L in 2022. Concentrations continue to be above the cleanup goal of 700 \|ig/L. Since 27 ------- December 2018, detections of ethylbenzene (excluding an anomalous result in December 2015) are five of the six lowest results reported during the monitoring program; • Naphthalene was detected at the historically highest concentration (11,800 ng/L) in 2022 and continues to persist above the cleanup goal of 1,500 ng/L; • Similar to results since December 2019 when use of a lower RL was initiated, benzo(a)pyrene continues to be detected at a low level above the cleanup goal of 0.2 \|ig/L; • Over the past five years, total xylenes were detected at the lower end of the historical range. Although consistently detected, the results have not exceeded the cleanup goal of 10,000 \|ig/L; • Consistent with results over the past five years, toluene was detected well below the cleanup goal of 1,000 ng/L; and • Carbazole has been detected from 4.9 \|ig/L in 2019 to 5.3 \|ig/L in 2022. The cleanup goal for carbazole is 5 Hg/L. MM-13C is located in the southwestern corner of the substation (Appendix K, Figure K-2). Groundwater analytical data for benzene ranged from a low of 17,300 \|ig/L in 2022 to a high of 28,400 ng/L in 2019. This exceeded the cleanup goal of 5.0 ng/L but was within the respective historical ranges. Ethylbenzene ranged from a low of 1,770 \|ig/L in 2019 to a high of 2,750 \|ag/L in 2020. This exceeded the cleanup goal of 700 \|ig/L but was within the respective historical ranges. Naphthalene ranged from a low of 763 \|ig/L in 2020 to a high of 3,200 \|ig/L in 2022. Naphthalene exceeded the cleanup goal of 1,500 \|ig/L, except for the 2020 sampling event, but was within the respective historical ranges. The remaining detected constituents (toluene and total xylenes) were below cleanup goals over the past five years, consistent with historical results. Benzo(a)pyrene was not detected above the RL (0.2 ng/L) over the past 5 years. Carbazole ranged from a low of 0.49 \|ig/L in 2022 to a high of 7.3 \|ig/L in 2020. Carbazole exceeded the cleanup goal of 5.0 \|ig/L, except for the 2022 sampling event. Middle Intermediate Sand Unit Groundwater samples were collected from 3 to 6 (depending on the event) middle intermediate monitoring wells during this FYR period. Table K-3 in Appendix K provides the analytical results and Figure K-3 provides the monitoring well locations with a historical summary of benzene and naphthalene concentrations. Appendix K provides the historical middle intermediate sand unit groundwater analytical results. For evaluation purposes and similar to the upper intermediate sand unit, the middle intermediate sand unit will be discussed in terms of the Fenton's reagent treatment area (BM-10C), natural attenuation areas (MM-02D, PM-01C, and MM-12B), and the sentinel areas (NM-06D and LM-08C). The sentinel wells are now sampled biennially and are intended to detect potential dissolved phase plume migration, should it occur. Fenton's Reagent Treatment Area (BM-10C) As shown in Appendix K, Figure K-3 and Table K-3, groundwater analytical results from BM-10C over the past five years indicate BTEX and naphthalene were detected. Benzene was detected from a low of 2,300 [ig/L in 2022 to a high of 5,350 [ig/L in 2020. Benzene detections exceeded the cleanup goal of 5.0 ng/L. The remaining detected constituents were below their respective 28 ------- cleanup goals. The detected constituent concentrations were within the historical ranges (Appendix K, Table K-3). Toluene was not detected above the RL of 5.0 ng/L for the first time since June 2017. Benzo(a)pyrene and carbazole were not detected above the RL, which is consistent with historical results. The groundwater data from BM-10C reflects groundwater quality variability in the middle intermediate sand unit. Natural Attenuation Areas (MM-02D. PM-01C. and MM-12B) Results for the three natural attenuation area monitoring well samples (MM-02D, PM-01C, and MM-12B) indicated that benzene concentrations exceeded the cleanup goal of 5 \|ig/L over the past five years. The naphthalene concentration in MM-02D exceeded the cleanup goal of 1,500 \|ig/L in each sampling event over the past five years, except in 2020 when naphthalene was detected at 1,150 \|ig/L. The remaining constituents were not detected above the RL except for ethylbenzene in the MM-02D and MM-12B samples, which was detected at relatively low concentrations. The following observations are made with respect to the historical benzene and naphthalene data (Figure 4): • MM-02D: Benzene and naphthalene fell within their respective historical range. • PM-01C: Benzene was at the low end of its historical range. Naphthalene was not detected above the RL, consistent with data since June 2017. • MM-12B: Benzene continued the trend of lower concentrations, with the last three results being the three lowest concentrations since September 2013. Naphthalene was not detected above the RL, consistent with results since the December 2015 event. Sentinel Areas (LM-08C and NM-06D) Consistent with historical results, constituents were not detected in groundwater samples from sentinel wells LM-08C and NM-06D confirming that potential dissolved phase plume migration into these areas is not occurring (Appendix K, Figure K-2, Table K-3). Lower Intermediate Sand Unit Groundwater analytical results for the 2 lower intermediate sand unit monitoring well samples (MM-01D and MM-16D) are provided in Appendix K, Table K-3. Historical benzene and naphthalene results are provided in Appendix K, Figure K-4. MM-01D exhibited its sixth consecutive result (since March 2018) not detected above the RL for benzene in December 2022 (Appendix K, Figure K-4). The other constituents analyzed in MM-01D remained not detected above the RL. Benzene (7.9 [Xg/L) and benzo(a)pyrene (0.85 ng/L) were detected in MM-16D above their cleanup goals of 5.0 pig/L and 0.2 [J.g/L, respectively, in 2020. Over the past five years, 2020 was the only sampling event with detections of constituents above cleanup goals. The results show a sustained 29 ------- downward trend in benzene concentrations from a maximum concentration of 430 pig/L (October 2001 and April 2005). Naphthalene has not been detected above the RL since May 2014. Site Inspection The site inspection took place on February 14, 2024. Participants included EPA RPM Allan Hernandez, Sara Callahan, Sara MacDonald, Billy Britton, and Timothy Kadar with SCDHEC, Tom Effinger and Paul Biery with DESC, and Rusty Contrael with Ace, Inc. The purpose of the inspection was to assess the protectiveness of the remedy. The participants met at the DESC electrical substation and began with an overview of the Site's history and status followed by a short health and safety briefing. The group then toured the Site, inspecting the active DNAPL pumps, recovery wells, DNAPL collection drums, and monitoring wells, which all appeared to be in good condition. The phytoremediation trees line the substation to the south and appeared healthy during the inspection. The substation is fenced, and access is restricted. Site inspection participants then toured the rest of the Site, which included monitoring wells and several areas that have been redeveloped (the South Carolina Aquarium and parking garage. Liberty Square, the Fort Sumter NPS property, and several commercial buildings). The participants also visited the three sediment caps. The Area 1 cap is covered by an observation platform at the Charlotte Street Park. Participants were able to see the oyster habitat area near the Area 2 cap and some of the concrete mats on the Area 3 cap. The site inspection checklist and photographs are included in Appendices G and M, respectively. The site inspection identified wells that are outside of the boundaries as defined by the 1998 and 2002 RODs and the previous FYRs. Wells exist north of Charlotte Street on the Ports Authority property and a small DESC substation at the corner of Washington Street and Charlotte Street. There are also wells on the west side of Washington Street in commercial/business parking lots. The former Ansonborough Homes housing project has been razed, soil remediation/removal completed, and redeveloped into commercial properties, parking area, soccer fields, and apartment building. There are no wells associated with the Site remaining within the former Ansonborough Homes housing projects. The EPA will transfer the local information repository to an online format, allowing the EPA to make information available to the public more efficiently and conveniently.8 The library can provide access via the publicly available computers. The EPA will post this FYR online at https://www.epa.gov/superfund/superfund-five-year-reviews. 8 On March 18, 2013, the EPA promulgated a final rule to amend 40 C.F.R § 300.805(c) of the NCP "Location of the Administrative Record File" to acknowledge advancements in technologies used to manage and convey information to the public. This enabled the EPA to make Administrative Records available to the public via the internet. 30 ------- V. TECHNICAL ASSESSMENT QUESTION A: Is the remedy functioning as intended by the decision documents? Question A Summary: A review of documents, ARARs, risk assumptions and the site inspection indicate that the Site's remedy is functioning as intended. The remedy is functioning as intended by the decision documents. About 63,400 tons of contaminated soil, sediment, coal tar and debris were excavated and disposed of offsite. A large amount of DNAPL was removed during the soil remediation. DNAPL removal is ongoing via a recovery system. Bioremediation was conducted by amending excavation backfill material and by conducting injections. During the soil excavation, contaminated water was removed and treated. Phytoremediation was implemented by USGS by planting trees near the substation and is ongoing as trees uptake contaminated groundwater. Three sediment caps are in place to prevent ecological exposure to contaminated sediments. From the beginning of the DNAPL removal program through November 2012, the highest volume removed from trench wells occurred at Segment 2, located in the south-central portion of the substation. From December 2012 through November 2014, the highest DNAPL volume removed alternated between Segment 2 (summer periods) and Segment 6 (winter periods). Since November 2014, the highest volume removed has occurred at Segment 6. This data suggests DNAPL volume in Segment 2 continues to diminish while at Segment 6 DNAPL volume has diminished at a slower rate (see Appendix L). Shallow sentinel well monitoring results indicate that the groundwater contamination does not appear to be migrating beyond the sentinel wells. Monitoring continues to be effective in detecting subtle changes in site conditions. Overall, average benzene and naphthalene concentrations in shallow groundwater are negative and show a downward trend (see Appendix J). Naphthalene, benzene, and other contaminant concentrations are above cleanup goals in several areas of the Site in both the shallow and intermediate aquifers. Some concentrations are increasing or fluctuating by about an order of magnitude. In addition, the OU-2 ROD estimated that intermediate groundwater monitoring would be needed for 12 years based on the expected effects of in situ treatment. Injections occurred in 2005 and 2006 (19 to 20 years ago), and some intermediate wells are still not trending downward (i.e., groundwater monitoring is still needed at this time). The remedy is taking longer than anticipated. DNAPL removal volumes appear to be increasing in DRW-06 and are likely reflective of pump adjustments by operation personnel. There is also a lack of clear decreasing trends in some shallow groundwater aqueous plume monitoring wells. Results of injections are also mixed in the intermediate aquifer. The PRP is aware of these issues and is actively 31 ------- looking for ways to improve remedy performance. When determined to be appropriate, the PRP also makes system adjustments to improve DNAPL recovery. Institutional controls are in place for the DESC property, which includes groundwater and land use restrictions. Part of the Charleston City Code (Ord. No. 2010-110, § 1, 7-20-10) acts as an institutional control for groundwater outside of the substation property. Institutional controls are not needed for soil at properties outside of the DESC substation property because soil cleanup has been completed and the soil PRGs are protective of a residential exposure scenario (Appendix I). Contamination remains in place under capped sediment areas, but decision documents do not require institutional controls to ensure the long-term integrity of sediment caps. Implementation of conventional institutional controls on riparian properties presents a wide range of challenges and is often deemed infeasible. As the sediment caps are located within a public waterway, no work of any kind can be performed in those areas without first obtaining prior permission and required permits from several regulatory agencies. That requirement acts as an institutional control that prevents activities that could potentially impact the integrity of the sediment caps. The OU-2 ROD called for institutional controls to restrict future use of intermediate groundwater on the DESC property; however, decision documents did not call for institutional controls for the substation property soil, for contaminated groundwater outside of the substation property or for the sediment caps. QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels and RAOs used at the time of the remedy selection still valid? Question B Summary: Groundwater cleanup goals based on Applicable or Relevant and Appropriate Requirements (ARARs) were reviewed as part of this FYR to determine if any ARAR values have changed since issuance of decision documents. The full evaluation is included in Table H-l, H-2, H-3, and H-4 of Appendix H and indicates that the only MCL that has changed is arsenic, which was removed from the COC list in 2002. Therefore, all the Site's ARAR-based cleanup goals remain protective. Groundwater cleanup goals that were health-based rather than ARAR-based were also reviewed as part of this FYR. These groundwater cleanup goals were compared to current Regional Screening Levels (RSLs) to see if they remain valid. RSLs incorporate current toxicity values and standard default exposure factors. The full evaluation is included in Table 1-1 of Appendix I and indicates that the health- based cleanup goals remain valid except for the noncancer risk from 2,4-dimethylphenol and the noncancer and cancer risk from naphthalene. Tap water RSLs are conservative screening levels for drinking water and the groundwater at the Site is not used for drinking; therefore, this does not affect current protectiveness. However, the cleanup goals for naphthalene and 2,4-dimethylphenol do not correspond to risks within the EPA's acceptable risk range. If groundwater ICs were to change, cleanup goals would need to be updated to levels that would protect human health and the environment. The June 2018 Shallow Groundwater Monitoring Report notes that the chrysene cleanup goal was changed from the 1998 OU-1 ROD's value of 20 \|ag/L to 200 \|-ig/L. This change was approved in a 32 ------- SCDHEC letter dated May 23, 2002. This cleanup goal change does not appear to have been documented in an EPA decision document. During this FYR period, chrysene was typically not detected except for the April 2020 Shallow Groundwater Sampling Event where chrysene was detected at 28 \|ag/L in sentinel well LM-10AR. This is above the ROD cleanup goal but well below the recent SCDHEC approved cleanup goal. Therefore, this cleanup goal change does not affect current protectiveness. The cleanup goal change needs to be formalized in an EPA decision document. Soil PRGs were based on risk rather than chemical specific ARARs. As part of this FYR, soil PRGs were compared to current RSLs to see if the PRGs remain valid. The full evaluation is included in Tables 1-3 and 1-4 of Appendix I and indicates that PRGs remain valid. The ecological-based sediment cleanup goals were reviewed and determined to be valid based on a comparison to current guidance levels (Appendix I, Table 1-5). Because VOCs are present in shallow groundwater at the Site, this FYR conducted a screening-level evaluation to determine whether there may be unacceptable risks from the vapor intrusion pathway. The screening-level vapor intrusion evaluation was performed using a commercial exposure scenario and the highest detected concentrations of VOCs from April 2019 to April 2023. Benzene and naphthalene concentrations were from the April 2019 shallow groundwater monitoring results for well MM-03A. Ethylbenzene, toluene, and total xylene concentration were from the April 2022 shallow groundwater monitoring results for well MM-03A. The evaluation indicated that vapor intrusion risks are currently within or below the EPA's target risk ranges. The full evaluation is included in Table 1-2 of Appendix I. Well MM-03A is near the DESC control building. As noted in the Site's 2009 Assessment of Vapor Intrusion report (Technical Memorandum #004), the control building houses electrical equipment and is highly ventilated to maintain appropriate operating temperatures. The building is also not occupied on a full-time basis but is used intermittently to perform required maintenance and monitoring tasks. Therefore, the vapor intrusion pathway does not currently present unacceptable risk at the Site. The RAOs used at the time of remedy selection remain valid. QUESTION C: Has any other information come to light that could call into question the protectiveness of the remedy? No other information has come to light that could call into question the protectiveness of the remedy. 33 ------- VI. ISSUES/RECOMMENDATIONS OU(s) without Issues/Recommendations Identified in the FYR: None Issues and Recommendations Identified in the FYR: OU(s): OU-1 Issue Category: Monitoring Issue: The 1998 ROD OU-1 chrysene cleanup goal of 20 ng/L was changed to 200 Hg/L. SCDHEC approved the change in a 2002 letter. The cleanup goal change was not recorded in a decision document. Recommendation: Record the chrysene cleanup goal of 200 ng/L in a decision document. Affect Current Protectiveness Affect Future Protectiveness Party Responsible Oversight Party Milestone Date No Yes EPA EPA 7/3/2028 OU(s): OU-1 and OU-2 Issue Category: Institutional Controls Issue: There are no remedial requirements for institutional controls for the substation property soil, site-related groundwater contamination outside of the substation property, or for the sediment caps. Recommendation: Record the need for institutional controls for the substation property soil, site-related groundwater contamination outside of the substation property, and the sediment caps in a decision document. Affect Current Protectiveness Affect Future Protectiveness Party Responsible Oversight Party Milestone Date No Yes EPA EPA 7/3/2028 Other Findings Two additional recommendations were identified during the FYR. These recommendations do not affect current and/or future protectiveness. • Record the decision to remove nickel, beryllium, lead, mercury, chromium, copper, and arsenic from the list of shallow groundwater COCs in a decision document. 34 ------- The cleanup goals for naphthalene and 2,4-dimethylphenol do not correspond to risks within the EPA's acceptable risk range. If groundwater ICs were to change, cleanup goals would need to be updated to levels that would protect human health and the environment. ------- VII. PROTECTIVENESS STATEMENT Protectiveness Statement(s) Operable Unit: Protectiveness Determination: OU-1 Short-term Protective Protectiveness Statement: The remedy at OU-1 currently protects human health and the environment because contaminated soil was excavated and disposed of off-site, DNAPL was removed during excavation and continues to be removed via ongoing DNAPL recovery, shallow groundwater monitoring, bioremediation products were put in backfill and injected into the subsurface, and institutional controls are in place to prevent exposure to contaminated groundwater. However, for the remedy to be protective over the long-term, the following action needs to be taken; • Update the chrysene groundwater cleanup goal in a decision document. • Record the need for institutional controls for the substation property soil, for site- related groundwater contamination outside of the substation property and for the sediment caps in a decision document. Protectiveness Statement(s) Operable Unit: Protectiveness Determination: OU-2 Short-term Protective Protectiveness Statement: The remedy at OU-2 currently protects human health and the environment because contaminated sediment was capped, intermediate groundwater monitoring is ongoing, bioremediation products were put in backfill and injected into the subsurface, and institutional controls are in place to prevent exposure to contaminated groundwater, ensure the long-term integrity of the sediment caps and to prohibit activities that could potentially disturb the caps. However, for the remedy to be protective over the long-term, the following action needs to be taken: • Record the need for institutional controls for the substation property soil, for site- related groundwater contamination outside of the substation property and for the sediment caps in a decision document. Sitewide Protectiveness Statement Protectiveness Determination: Short-term Protective Protectiveness Statement: Because the remedies for OU-1 and OU-2 are protective in the short term, the sitewide remedy is protective in the short term. For the sitewide remedy to be protective over 36 ------- the long term, the issues identified for OU-1 and OU-2 need to be addressed. VIII. NEXT REVIEW The next FYR for the Site is required five years from the completion date of this review. 37 ------- APPENDIX A - REFERENCE LIST Explanation of Significant Differences. EPA. Calhoun Park Area Site, Charleston, South Carolina. November 2005. Fourth Quarter 2019 Progress Report. Calhoun Park Area Site Activities. Charleston, South Carolina. Dominion Energy, South Carolina, Inc. January 29, 2020. Fortieth DNAPL Removal Report. June 2021 through November 2021. DESC - Calhoun Park Area Site, Charleston, South Carolina. April 26, 2022. Forty-First DNAPL Removal Report. December 2021 through May 2022. DESC - Calhoun Park Area Site, Charleston, South Carolina. October 17, 2022. Forty-Second DNAPL Removal Report. June 2022 through November 2022. DESC - Calhoun Park Area Site, Charleston, South Carolina. March 30, 2023. Forty-Third DNAPL Removal Report. December 2022 through May 2023. DESC - Calhoun Park Area Site, Charleston, South Carolina. November 9, 2023. Interim Remedial Action Report, OU-1. Management and Technical Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. August 2006. Operable Unit #1 Shallow Groundwater Monitoring Results - April 2020 Event. Calhoun Park Area Site, Charleston, South Carolina. July 2020. Operable Unit #1 Shallow Groundwater Monitoring Results - April 2021 Event. Calhoun Park Area Site, Charleston, South Carolina. August 2021. Operable Unit #1 Shallow Groundwater Monitoring Results - April 2022 Event. Calhoun Park Area Site, Charleston, South Carolina. August 2022. Operable Unit #1 Shallow Groundwater Monitoring Results - May 2022 Event. Calhoun Park Area Site, Charleston, South Carolina. October 2023. Operable Unit #2 Intermediate Groundwater Monitoring Results - December 2019 Event. Calhoun Park Area Site, Charleston, South Carolina. May 2020. A-l ------- Operable Unit #2 Intermediate Groundwater Monitoring Results - December 2020 Event. Calhoun Park Area Site, Charleston, South Carolina. February 2021. Operable Unit #2 Intermediate Groundwater Monitoring Results - November 2021 Event. Calhoun Park Area Site, Charleston, South Carolina. February 2022. Operable Unit #2 Intermediate Groundwater Monitoring Results - December 2022 Event. Calhoun Park Area Site, Charleston, South Carolina. May 2023. Record of Decision, OU-1. EPA. Calhoun Park Area Site, Charleston, South Carolina. September 1998: Record of Decision, OU-2. EPA. Calhoun Park Area Site, Charleston, South Carolina. September 2002. Remedial Action Report, OU-2. Areas 1, 2 and 3 Sediments. Management and Technical Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. November 2013. Remedial Action Report, 002. Intermediate Groundwater. Management and Technical Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. June 2007. Reuse and the Benefit to Community - A Beneficial Effects Economic Case Study for the Calhoun Park Area Site. EPA. 2020. Second Five-Year Review Report. Operable Units 1 and 2. EPA. Calhoun Park Area Site, Charleston, South Carolina. August 2014. Technical Memorandum #004-Assessment of Vapor Intrusion. Management & Technical Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. February 2009. Third Five-Year Report for Calhoun Park Area. Charleston County, South Carolina. August 15, 2019. Thirty-Sixth DNAPL Removal Report. June 2019 through November 2019. DESC - Calhoun Park Area Site, Charleston, South Carolina. March 30, 2020. Thirty-Seventh DNAPL Removal Report. December 2019 through May 2020. DESC - Calhoun Park Area Site, Charleston, South Carolina. October 27, 2020. A-2 ------- Thirty-Eighth DNAPL Removal Report. June 2020 through November 2020. DESC - Calhoun Park Area Site, Charleston, South Carolina. March 25, 2021. Thirty-Ninth DNAPL Removal Report. December 2020 through May 2021. DESC - Calhoun Park Area Site, Charleston, South Carolina. September 22, 2021. A-3 ------- APPENDIX B - CURRENT SITE STATUS Environmental Indicators - Current human exposures at the Site are under control. - Current groundwater migration is under control. Are Necessary Institutional Controls in Place? f ^ All Q Some Q None \| ~ Yes ^ Has EPA Designated the Site as Sitewide Ready for Anticipated Use? No Has the Site Been Put into Reuse? fX Yes ~ No B-l ------- APPENDIX C - SITE CHRONOLOGY Table C-l: Site Chronology Event Date Manufactured gas plant operated on site 1855 - 1957 Contamination was discovered May 22, 1991 The EPA conducted the Preliminary Assessment September 4, 1991 The EPA conducted the Site Inspection June 24, 1992 SCE&G entered into an Administrative Order with the EPA to perform an Rl January 22, 1993 The EPA approved SCE&G's Removal Action Work Plan July 22, 1998 SCE&G completed the remedial investigation/feasibility study The EPA issued the OU 1 ROD September 30, 1998 Start of DNAPL removal October 1998 Unilateral Administrative Order for OU 1 January 19,1999 SCE&G completed source removal activities completed - Phase 1 through VI February 1999- June 2000 SCE&G completed remedial design July 13, 2000 SCE&G completed phase VII source removal April 2002 SCE&G completed the RI/FS forOU-2 March 9, 2002 The EPA issued the OU-2 ROD September 24, 2002 Unilateral Administrative Order for OU-2 September 23, 2003 PRP Remedial Design (OU-2) start October 13. 2003 PRP Remedial Design (OU-2 - Sediments) start March 12, 2004 PRP Remedial Design (OU-2 - Sediments) Addendum August 13, 2004 SCE&G completed phase VIII source removal December 2004 The EPA issued an ESD for OU -1 November 7, 2005 SCE&G completed the OU-2 sediment remedial action in Area 2 and Area 3 August 2006 Vapor intrusion Technical Memorandum submitted February 2009 First FYR August 26 2009 SCE&G completed the OU-2 sediment remedial action in Area 1 December 14 2012 Second FYR August 22, 2014 Institutional controls implemented for the SCE&G property via a Declaration of Covenants and Restrictions September 2018 Third FYR August 15, 2019 C-l ------- APPENDIX D - PRESS NOTICE D-l ------- U.S. ENVIRONMENTAL PROTECTION AGENCY NEWS RELEASE EPA.GOV/NEWSRO EPA to Review Cleanups at 40 Southeast Superfund Sites Contact Information: region4press@epa.eov, 404-562-8400 ATLANTA (Oct. 19, 2023} - Today, the U.S. Environmental Protection Agency (EPA) announced that comprehensive reviews will be conducted of completed cleanup work at 40 Superfund sites in the Southeast. The sites, located in Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, and Tennessee, will undergo a legally required Five-Year Review to ensure that previous remediation efforts at the sites continue to protect public health and the environment. "Five-Year Reviews are an integral part of the site remediation process because they help make sure remedies are still protective," said Acting EPA Region 4 Administrator Jeaneanne Gettle. "The Southeast Region will benefit tremendously from the full restoration of Superfund sites, which can become valuable parts of the community landscape." The Superfund Sites where EPA will conduct Five-Year Reviews in Calendar Year 2024 are listed below. The web links provide detailed information on site status as well as past assessment and cleanup activity. Once the Five-Year Review is complete, its findings will be posted in a final report at https://www.epa.gov/superfund/search-superfund-five-year- reviews. Alabama American Brass Property https://www.epa.gov/superfund/american-brass Florida Arkla Terra Property https://www.epa.gov/superfund/arkla-terra Brown's Dump https://www.epa.gov/superfund/brown's-dump City Industries, Inc. https://www.epa.gov/superfund/citv-industries-inc Coleman-Evans Wood Preserving Co. https://www.epa.gov/superfund/coleman-evans-wood Harris Corp. (Palm Bay Plant) https://www.epa,gov/superfund/harris-corporation-palm Jacksonville Ash Site https://www.epa.gov/superfund/iacksonville-ash Kassauf-Kimerling Battery Disposal https://www.epa.gov/superfund/kassauf-kimerling-th Nocatee Hull Creosote https://www.epa.gov/superfund/nocatee-creosote Pioneer Sand Co. https://www.epa.gov/superfund/pioneer-sand-companv Piper Aircraft Corp./Vero Beach Water & Sewer Dept. https://www.epa.gov/superfund/piper-aircraft-corp D-2 ------- Sandford Gasification Plant https://www.epa,gov/superfund/sanford-gasification Sixty-Second Street Dump https://www.epa.gov/superfund/sixtv-second-street Solitron Microwave https://www.epa.gov/superfund/solitron-niicrowave Tyndall Air Force Base https://www.epa.gov/superfund/tyndall-air-force-base United Metals, Inc. https://www.epa.gov/superfund/united-metals-inc Whitehouse Oil Pits https://www.epa.gov/superfund/whitehouse-oil-pits Georgia Woolfolk Chemical Works, Inc. https://www.epa.gov/superfund/woolfolk-chemical-works Kentucky Airco https://www.epa.gov/superfund/airco B. F. Goodrich https://www.epa.gov/superfund/bf-goodrich Paducah Gaseous Diffusion Plant (USDOE) https://www.epa.gov/superfund/paducha-easeous-diffusjon-plant Mississippi Sonford Products https://www.epa.gov/superfund/sonford-products North Carolina General Electric Co/Shephard Farm https://www.epa.gov/superfund/general-electric-shepherd-farm North Belmont PCE https://www.epa.gov/superfund/north-belmont-pce South Carolina Calhoun Park Area https://www.epa.gov/superfund/search-superfund-five-vear-reviews Gieger ( C & M Oil) https://www.epa.gov/superfund/geiger Helena Chemical Co. Landfill https://www.epa.gov/superfund/helena-cheniical-landfill Lyman Dyeing and Finishing https://www.epa.gov/superfund/lvman-dyeing-finishing Medley Farm Drum Dump https://www.epa.gov/superfund/medlev-farm-drum-dump Savannah River Site (USDOE) https://www.epa.gov/superfund/savannah-river-site WamChem, Inc. https://www.epa.gov/superfund/wamchem Tennessee American Creosote Works, Inc. (Jackson Plant) https://www.epa.gov/superfund/american-creosote-works-iackson Oak Ridge Reservation (USDOE) https://www.epa.gov/superfund/oak-ridge-reservation D-3 ------- Ross Metals Inc. https://www,epa,gov/superfund/ross-metals Background Throughout the process of designing and constructing a cleanup at a hazardous waste site, EPA's primary goal is to make sure the remedy will be protective of public health and the environment. At many sites, where the remedy has been constructed, EPA continues to ensure it remains protective by requiring reviews of cleanups every five years. It is important for EPA to regularly check on these sites to ensure the remedy is working properly. These reviews identify issues (if any) that may affect the protectiveness of the completed remedy and, if necessary, recommend action(s) necessary to address them. There are many phases of the Superfund cleanup process including considering future use and redevelopment at sites and conducting post cleanup monitoring of sites. EPA must ensure the remedy is protective of public health and the environment and any redevelopment will uphold the protectiveness of the remedy into the future. The Superfund program, a federal program established by Congress in 1980, investigates and cleans up the most complex, uncontrolled, or abandoned hazardous waste sites in the country and endeavors to facilitate activities to return them to productive use. In total, there are more than 280 Superfund sites across the Southeast. More information: EPA's Superfund program: https://www.epa.gov/superfund ### I ©@©o D-4 ------- APPENDIX E-SITE MAPS E-l ------- mm Of£i\|\|j Trailer jSontrM Building iFormer Ansonborough i Homes Property ¦Charleston Calhoun Park Area Superfund Site Charleston, Charleston County, SC Site Location Map KiMy 9S90& iriSsWfyi Figure E-l: Site Location Map E-2 ------- Area 2 Former Rail Spur Area ^^_Area 1 rmer Gas Holder Area Area 5 m's Property Area 3 Former Oil Tank Area ¥ Area 6 NPS Property Area 4 CM-05A Figure E-2: Historical Site Map (Source: Management and Technical Resources, Inc.) E-3 ------- APPENDIX F - INTERVIEW FORMS F-l ------- Interview Form for Five-Year Review Site Name: Calhoun Park Area Interviewer's Name: Timothy Kadar Affiliation: SCDHEC Interviewee's Name: Sara Callahan Affiliation: SCDHEC, Federal Remediation Project Manager Contact Information: SCDHEC 2600 Bull Street Columbia, SC 29201 CallahSE(a)d hec.sc.gov Type of Interview: Email Date: January 2024 1. What is your overall impression of the project, including cleanup, maintenance and reuse activities (as appropriate)? The Site remediation is progressing at an acceptable rate. The hydrology/geology of the Site is well understood, and the groundwater contaminant plume is well defined as is the DNAPL. Current land uses at the site include commercial and residential buildings, continued utility services, public and educational services, recreational and cultural attractions and ecological projects. 2. What is your assessment of the current performance of the remedy in place at the Site? Pumping, chemical oxidant injection, and phytoremediation are effective in removing NAPL/DNAPL and reducing groundwater contaminants. Between October 1998 and November 2023, approximately 52,113 gallons of NAPL/DNAPL have been recovered. Historical concentrations of the principal groundwater contaminants, benzene and naphthalene, have fluctuated but show an overall declining trend. 3. Are you aware of any complaints or inquiries regarding site-related environmental issues or remedial activities from residents in the past five years? I am unaware of any complaints of inquiries regarding site-related environmental issues or remedial activities associated with the Site. 4. Has your office conducted any site-related activities or communications in the past five years? If so, please describe the purpose and results of these activities. SCDHEC has provided review and comments to EPA and the site contractor regarding progress reports, groundwater monitoring results, and DNAPL removal reports: SCDHEC has also participated in F-2 ------- conference calls and site visits to monitor the status of site remediation. On February 14, 2024, SCDHEC, EPA, and the contractors conducted a site inspection for the 2024 FYR. 5. Are you aware of any changes to state laws that might affect the protectiveness of the Site's remedy? No. 6. Are you comfortable with the status of the institutional controls at the Site? If not, what are the associated outstanding issues? I am comfortable with the status of the institutional controls at the Site. 7. Are you aware of any changes in projected land use(s) at the Site? I am not aware of any changes in the projected land use(s) at the Site. 8. Do you have any comments, suggestions or recommendations regarding the management or operation of the Site's remedy? I have no comments or suggestions regarding the management or operations of the Site remedy. The extraction of DNAPL is effective. The schedule of DNAPL removal and groundwater sampling has been optimized. F-3 ------- Interview Form for Five-Year Review Site Name: Calhoun Park Area Interviewer's Name: Timothy Kadar Interviewee's Name: Thomas Effinger Affiliation: SCDHEC Affiliation: DESC South Carolina Contact Information: thomas.effinger@dominionenergy.com Type of Interview: Email Date: February 20, 2024 1. What is your overall impression of the remedial activities at the Site? Dominion Energy South Carolina (DESC) has and continues to work hard to remediate various impacted media at the Site, while maintaining the safe operation of a critically important electrical substation. The on-going site work is being completed with minimal disruption to the surrounding community. The completed and on-going remedial activities continue to be protective of the environment, practical (given site limitations), and cost-effective. 2. What have been the effects of this Site on the surrounding community, if any? Since the late 1990's, integrating site remediation with redevelopment allowed the remedy to proceed during other project construction and development activities which in-turn helped support many beneficial property reuse improvements for the surrounding community. Completed Site redevelopment activities include a parking garage, the South Carolina Aquarium and open green space used for various community events, an office/shopping facility, and the National Park Service's Fort Sumter tour boat facility. The Charlotte Street Park, which includes an observation deck extending over the Cooper River, was completed and future development plans for the site include an outdoor venue or other amenities to support the growing local economy and tourism to the area. 3. What is your assessment of the current performance of the remedy in place at the Site? The remedy in place at the Site is meeting and achieving the remedial objectives of the Record of Decision (ROD). Dense Non-Aqueous Phase Liquids (DNAPL) continue to be removed from various locations throughout the site and elevated groundwater constituents continue to attenuate as a result. The total DNAPL removed is over 52,000 gallons and continues. 4. Are you aware of any complaints or inquiries regarding environmental issues or the remedial action from residents since implementation of the cleanup? There have been no complaints but there have been several inquiries from various property owners since the implementation of the cleanup, which began in 1998. Currently, DESC is not aware of any unresolved environmental issues with any residents. F-4 ------- 5. Do you feel well informed regarding the Site's activities and remedial progress? If not, how might EPA convey site-related information in the future? Yes, I am very well informed of the site's activities and remedial progress. 6. Do you have any comments, suggestions or recommendations regarding the management or operation of the Site's remedy? I believe that the operation of the Site remedy is both protective of the environment and cost effective. There may be opportunities for improvement in monitoring and reporting since the site has such a long history of data collection and observed positive trends. Optimization is believed to be appropriate for the shallow and intermediate groundwater monitoring and reporting as well as for the routine quarterly reports. We are discussing ways to streamline these measures with the state and federal agencies and have received constructive feedback. We are also looking at proper abandonment of groundwater wells that are no longer relevant. 7. Do you consent to have your name included along with your responses to this questionnaire in the FYR report? Yes. F-5 ------- Interview Form for Five-Year Review Site Name: Calhoun Park Area Interviewer's Name: Timothy Kadar Interviewee's Name: Rusty Contrael Affiliation: SCDHEC Affiliation: Ace, Inc. Contact Information: rcontrael@ace-mgp.com Type of Interview: Email Date: February 27, 2024 1. What is your overall impression of the project; including cleanup, maintenance, and reuse activities (as appropriate)? My overall impression of the project is that the initial cleanup activities were completed to the maximum extent practicable given the logistical constraints and geological challenges encountered at this Site. The on-going operation and maintenance (O&M) activities continue to be efficient and cost-effective, based largely on the volume of dense, non-aqueous phase liquid (DNAPL) that continues to be recovered. The potential for Site reuse has been maximized. The site was awarded the "Excellence in Site Reuse" from the EPA in 2012. 2. What is your assessment of the current performance of the remedy in place at the Site? The remedy is performing as intended and providing sufficient protection of human health and the environment. 3. What are the findings from the monitoring data? What are the key trends in contaminant levels that are being documented over time at the Site? Based on the on-going DNAPL Monitoring and Recovery Program, DNAPL continues to be recovered to the maximum extent practicable, consistent with the first objective of the Record of Decision (ROD) for the Site. As of the end of May, 2023 over 52,000 gallons of DNAPL has been recovered from the Site. Based on the groundwater monitoring programs: • DNAPL and impacted groundwater migration is not occurring; and • The overall extent of groundwater impacts and constituent concentrations continues to decrease. For the OU #1 shallow zone groundwater, flow patterns remain fairly consistent, while benzene and naphthalene concentrations continue to trend downward (with some variation). F-6 ------- For the OU #2 intermediate zone groundwater, flow patterns are also remaining consistent, while overall, benzene and naphthalene concentrations continue to trend downward (with some variation). The overall groundwater monitoring program is effective and efficient in providing accurate documentation of key trends in contaminant levels. 4. Is there a continuous on-site O&M presence? If so, please describe staff responsibilities and activities. Alternatively, please describe staff responsibilities and the frequency of site inspections and activities if there is not a continuous on-site O&M presence. Yes - There is a very consistent O&M presence at the Site with environmental personnel on site for approximately 2 weeks, then off-site for 1 week. This off-site period, (approximately 10 days including the weekends) provides ample time for DNAPL to re-accumulate in the subsurface collection/containment system, thereby increasing the efficiency for removal. Staff responsibilities include: DNAPL measurement, maintenance, and removal activities from various site-wide locations, maintaining the shallow and intermediate groundwater sampling program, providing environmental support for other intrusive field activities related to the operation of the electrical substation/equipment and maintaining the Site facilities. Providing support for other intrusive field activities, (i.e. future construction worker protection [including the future utility worker]) was another important objective for the overall remedial approach at the Site. Having established the protocols and procedures for providing environmental support for the installation of new or updated substation equipment allows DESC to fulfill its' commitment to continue to provide efficient and reliable electrical service to Charleston and the surrounding community. Periodically, when intrusive activities are required by substation personnel, on-site, environmental O&M personnel will typically conduct a health and safety briefing for the electrical utility workers and any subcontractors that may also be working in the substation. Oversight tasks will also include monitoring the intrusive work area and being prepared to appropriately manage any impacted material that may be generated during construction activities. By having the O&M workers routinely on site allows DESC to provide environmental support for substation expansion and is fully consistent with the intent of the remedy to be protective of "a future construction worker." 5. Have there been any significant changes in site O&M requirements, maintenance schedules or sampling routines since start-up or in the last five years? If so, do they affect the protectiveness or effectiveness of the remedy? Please describe changes and impacts. In general, there have been no significant changes in the O&M requirements associated with the Site-Wide DNAPL recovery program within the last five years. In July 2010, the schedule for site O&M personnel staffing was reduced to the 2-week on and 1-week off F-7 ------- pumping schedule discussed above. This reduction in labor has continued to result in more DNAPL volume being recovered per pumping event, while reducing labor and overall site costs. The DNAPL recovery O&M schedule is evaluated periodically and has remained essentially the same for this 5-year review period. Tradebe Treatment and Recycling of Tennessee, LLC was utilized as the approved recycling facility for the recovered DNAPL through June 2021. Based on several factors, DESC determined that the Giant Resource Recovery-Sumter, Inc. (GRR-Sumter) facility in Sumter, South Carolina would be a suitable alternative to utilize as the facility for the recovered DNAPL in their fuel blending process. Following the approval process, U.S. EPA and SCDHEC were notified of the change in the Fourth Quarter of 2021 Progress Report submitted on January 24, 2022. Regarding the shallow groundwater monitoring program, the sampling frequency was reduced to an annual event from a 9-month sampling interval in April of 2019, based on regulatory approval dated January 9, 2019. This approval also included sampling of the sentinel wells on a biennial basis (i.e. every other year). These changes have resulted in cost savings and improved efficiency of the program. For the intermediate groundwater monitoring program, similar optimizations/reductions have been proposed and implemented. In May of 2019, DESC requested that the intermediate groundwater monitoring program be reduced from a semi-annual frequency to an annual basis along with other requested modifications/reductions. In June 2019, SCDHEC concurred with the request including: • Reducing sampling frequency to annual events; • Reducing the sampling of sentinel wells to biannual; • Eliminating 2,4 dimethylphenol from the sampling program; • Eliminating 13 of 14 wells recommended for collecting groundwater elevations; and • Subsequently, removal of MM-14C from the annual sampling program. Overall, the primary objective of the ROD (DNAPL removal to the maximum extent practicable) continues to be achieved. The groundwater monitoring programs have been optimized over the years and are focused and cost-effective. The protectiveness or effectiveness of the remedy has not been adversely affected by these changes. 6. Have there been unexpected O&M difficulties or costs at the Site since start-up or in the last five years? If so, please provide details. There have been no unexpected O&M difficulties or costs at the Site since start-up or in the last five years. However, it should be noted that the facility used for DNAPL recycling has changed over the years and transportation and handling costs have increased. F-8 ------- 7. Have there been opportunities to optimize O&M activities or sampling efforts? Please describe changes and any resulting or desired cost savings or improved efficiencies. Yes. As stated above and with agency approval, the shallow and intermediate groundwater monitoring programs were reduced to annual events. Additional changes that have resulted in optimization include sampling the sentinel groundwater monitoring wells every other year and eliminating constituents from the parameter lists to provide further focus to the monitoring program. These changes have resulted in cost savings and improved efficiency. 8. Do you have any comments, suggestions or recommendations regarding O&M activities and schedules at the Site? Yes, there are a number of groundwater monitoring wells at the Site that are no longer essential to the monitoring programs and these wells should be properly abandoned. Additionally, the current groundwater monitoring programs should be evaluated and recommendations to reduce sampling frequencies, locations and constituents may be warranted. Other changes may be appropriate in the future and will be presented to EPA and SCDHEC if justified, to provide for continuous improvement and optimization of the programs. 9. Do you consent to have your name included along with your responses to this questionnaire in the FYR report? Yes F-9 ------- APPENDIX G - SITE INSPECTION CHECKLIST Site Name: Calhoun Park Area Date of Inspection: 2/14/2024 Location and Region: Charleston, South Carolina, Region 4 EPA ID:SCD987581337 Agency, Office or Company Leading the Five-Year Review: EPA Region 4 Weather/Temperature: 60's and mostly sunny Remedy Includes: (Check all that apply) I I Landfill cover/containment I I Access controls 15^1 Institutional controls I I Groundwater pump and treatment I I Surface water collection and treatment 15^1 Other: DNAPL extraction, sediment capping, contaminated soil removal. Phvtoremediation and in-situ groundwater treatment. I I Monitored natural attenuation I I Groundwater containment I I Vertical barrier walls Attachments: Q Inspection team roster attached I I Site map attached II. INTERVIEWS (check all that apply) 1. O&M Site Manager Tom Effinger Dominion Energy SC. Inc 2/15/2024 Name Title Date Interviewed Q] at site Q] at office ^ by email Phone: Problems, suggestions ^ Report attached: Interview responses are included in Appendix E and summarized in section IV of this FYR. 2. O&M Staff Ace, Inc. 2/27/2024 Date Rusty Contrael Name Title Interviewed Q at site Q] at office ^ by email Phone: Problems/suggestions Q Report attached: Interview responses are included in Appendix E and summarized in jg£ii£nJy=2flhl!=EX!L 3. Local Regulatory Authorities and Response Agencies (i.e., state and tribal offices, emergency response office, police department, office of public health or environmental health, zoning office, recorder of deeds, or other city and county offices). Fill in all that apply. Agency SCDHEC Contact Sara Callahan Name Problems/suggestions Q] Report attached: Project Manager Title 2/14/2024 Date Phone No. Agency _ Contact Name Title Problems/suggestions Q Report attached:_ Date Phone No. 4. Other Interviews (optional) Q] Report attached:. I. ON-SITE DOCUMENTS AND RECORDS VERIFIED (check all that apply) 1. O&M Documents 15^1 O&M manual Readily available Up to date ~ N/A G-l ------- 153 As-built drawings ^ Readily available 153 Up to date ~ N/A 153 Maintenance logs ^ Readily available 1X1 Up to date N/A Remarks: 2. Site-Specific Health and Safety Plan 153 Readily available 153 Up to date ~ n/a 153 Contingency plan/emergency response plan 153 Readily available IXI Up to date ~ n/a Remarks: 3. O&M and OSHA Training Records 153 Readily available 153 Up to date ~ n/a Remarks: 4. Permits and Service Agreements 1 1 Air discharge permit 1 1 Readily available 1 1 Up to date ~ n/a 1 1 Effluent discharge 1 1 Readily available 1 1 Up to date ~ n/a \| \| Waste disposal, POTW 1 1 Readily available 1 1 Up to date ~ n/a 153 Other permits: See Below 153 Readily available 1 1 Up to date ~ n/a Remarks: While not required by the remedy, after on-site filtration, the PRP discharges any wastewater generated on site to the publicly-owned treatment works under a temporary discharge permit. 5. Gas Generation Records 1 1 Readily available 1 1 Up to date \|KI N/A Remarks: 6. Settlement Monument Records 1 1 Readily available 1 1 Up to date \|KI N/A Remarks: 7. Groundwater Monitoring Records 153 Readily available 153 Up to date ~ n/a Remarks: 8. Leachate Extraction Records 1 1 Readily available 1 1 Up to date \|KI N/A Remarks: 9. Discharge Compliance Records ~ Air 1 1 Readily available 1 1 Up to date M N/A 1 1 Water (effluent) ~ Readily available 1 1 Up to date N/A Remarks: 10. Da ily Access/Secu rity Logs 153 Readily available 153 Up to date ~ n/a Remarks: IV. O&M COSTS 1. O&M Organization 1 1 State in-house ~ Contractor for state 1 1 PRP in-house £ 3 Contractor for PRP 1 1 Federal facility in-house ~ Contractor for Federal facility ~ G-2 ------- 2. O&M Cost Records EH Readily available I I Up to date I I Funding mechanism/agreement in place ^ Unavailable Original O&M cost estimate: EH Breakdown attached 3. Unanticipated or Unusually High O&M Costs during Review Period Describe costs and reasons: Not Applicable V. ACCESS AND INSTITUTIONAL CONTROLS ^ Applicable ~ N/A A. Fencing 1. Fencing Damaged EH Location shown on site map 15^1 Gates secured ~ N/A Remarks: B. Other Access Restrictions 1. Signs and Other Security Measures EH Location shown on site map ~ n/a Remarks: Clear signage at locked front gate. C. Institutional Controls (ICs) Implementation and Enforcement Site conditions imply ICs not properly implemented ~ Yes No ~ N/A Site conditions imply ICs not being fully enforced ~ Yes No EH N/A Type of monitoring (e.g., self-reporting, drive by): Self Reported Frequency: Annually Responsible party/agency: RP Contact Name Title Date Phone no. Reporting is up to date lElYes ~ No EH N/A Reports are verified by the lead agency EH Yes ~ No IEI N/A Specific requirements in deed or decision documents have been met EH Yes ~ No \|KI N/A Violations have been reported EH Yes ~ No \|KI N/A Other problems or suggestions: \| \| Report attached 2. Adequacvl^l ICs are adequate I I ICs are inadequate ~ n/a Remarks: Institutional controls are in place and adequate for the Site. See the Institutional Control Review section of this FYR for additional details. D. General 1. Vandalism/Trespassing EH Location shown on site map 15^1 No vandalism evident Remarks: 2. Land Use Changes On Site ^ N/A Remarks: G-3 ------- 3. Land Use Changes Off Site ^ N/A Remarks: VI. GENERAL SITE CONDITIONS A. Roads Applicable ^ N/A 1. Roads Damaged Q Location shown on site map I I Roads adequate ~ n/a Remarks: B. Other Site Conditions Remarks: VII. LANDFILL COVERS ~ Applicable ^ N/A VIII. VERTICAL BARRIER WALLS ~ Applicable ^ N/A IX. GROUNDWATER/SURFACE WATER REMEDIES ^ Applicable ~ N/A A. Groundwater Extraction Wells, Pumps and Pipelines ^ Applicable ~ n/a 1. Pumps, Wellhead Plumbing and Electrical 15^1 Good condition All required wells properly operating Q] Needs maintenance ~ n/a Remarks: 2. Extraction System Pipelines, Valves, Valve Boxes and Other Appurtenances Good condition I I Needs maintenance Remarks: Extraction is DNAPL rather than groundwater 3. Spare Parts and Equipment 15^1 Readily available Good condition Q] Requires upgrade Q] Needs to be provided Remarks: B. Surface Water Collection Structures, Pumps and Pipelines Q Applicable ^ N/A 1. Collection Structures, Pumps and Electrical I I Good condition I I Needs maintenance 2. Surface Water Collection System Pipelines, Valves, Valve Boxes and Other Appurtenances Good condition I I Needs maintenance Remarks: 3. Spare Parts and Equipment I I Readily available Q] Good condition Q] Requires upgrade Q] Needs to be provided Remarks: C. Treatment System Q Applicable ^ N/A 1. Treatment Train (check components that apply) I I Metals removal Q] Oil/water separation Q] Bioremediation Air stripping I I Carbon adsorbers G-4 ------- I-! Filters: 1 1 Additive (e.g., chelation agent, flocculent): I-! Others: 1 1 Good condition Q] Needs maintenance 1 1 Sampling ports properly marked and functional 1 1 Sampling/maintenance log displayed and up to date 1 1 Equipment properly identified 1 1 Quantity of groundwater treated annually: 1 1 Quantity of surface water treated annually: Remarks: 2. Electrical Enclosures and Panels (properly rated and functional) 15^1 N/A Good condition Q] Needs maintenance Remarks: 3. Tanks, Vaults, Storage Vessels ^ N/A Good condition 1 1 Proper secondary containment 1 1 Needs maintenance Remarks: 4. Discharge Structure and Appurtenances 15^1 N/A Good condition Q] Needs maintenance Remarks: 5. Treatment Building(s) 15^1 N/A Good condition (esp. roof and doorways) 1 1 Needs repair 1 1 Chemicals and equipment properly stored Remarks: 6. Monitoring Wells (pump and treatment remedy) 15^1 Properly secured/locked ^ Functioning ^ Routinely sampled 15^1 Good condition 15^1 All required wells located Q] Needs maintenance ~ N/A Remarks: D. Monitoring Data 1. Monitoring Data 15^1 Is routinely submitted on time ^ Is of acceptable quality 2. Monitoring Data Suggests: 15^1 Groundwater plume is effectively contained Q] Contaminant concentrations are declining E. Monitored Natural Attenuation G-5 ------- 1. Monitoring Wells (natural attenuation remedy) I I Properly secured/locked Q] Functioning Q] Routinely sampled Q] Good condition All required wells located Q] Needs maintenance 15^1 N/A Remarks: X. OTHER REMEDIES If there are remedies applied at the site and not covered above, attach an inspection sheet describing the physical nature and condition of any facility associated with the remedy. An example would be soil vapor extraction. XI. OVERALL OBSERVATIONS A . Implementation of the Remedy Describe issues and observations relating to whether the remedy is effective and functioning as designed. Begin with a brief statement of what the remedy is designed to accomplish (e.g., to contain contaminant plume, minimize infiltration and gas emissions). The remedy appears to be functioning as intended. Past soil removal actions addressed soil contamination. Contaminated sediments were capped, and products were injected to groundwater to enhance contamination degradation. DNAPL removal is ongoing. Groundwater monitoring continues. Institutional controls are in place to prevent exposure to remaining site-related contamination. Phvtoremediation is in place via tree plantings to improve groundwater quality. B . Adequacy of O&M Describe issues and observations related to the implementation and scope of O&M procedures. In particular, discuss their relationship to the current and long-term protectiveness of the remedy. The PRP contractor maintains the Site, associated structures, grounds, fencing, pumping equipment, and monitoring wells in good and operable condition. C . Early Indicators of Potential Remedy Problems Describe issues and observations such as unexpected changes in the cost or scope of O&M or a high frequency of unscheduled repairs that suggest that the protectiveness of the remedy may be compromised in the future. The OU-2 ROD estimated that intermediate groundwater monitoring would be needed for 12 years based on the expected effects of in-situ treatment. Injections occurred in 2005 and 2006 and COC concentrations in some intermediate groundwater monitoring wells are still not trending downwards. D . Opportunities for Optimization Describe possible opportunities for optimization in monitoring tasks or the operation of the remedy. None Site Inspection Participants: Allan Hernandez, EPA Thomas Effinger, DESC Rusty Contrael, ACE Sara MacDonald, SCDHEC Sara Callahan, SCDHEC Billy Britton, SCDHEC Timothy Kadar, SCDHEC G-6 ------- APPENDIX H - DETAILED ARARs REVIEW Appendix H includes a review of relevant, site-related documents including the RODs, AROD, remedial action reports and recent monitoring data. CERCLA Section 121(d)(1) requires that Superfund remedial actions attain "a degree of cleanup of hazardous substance, pollutants, and contaminants released into the environment and of control of further release at a minimum which assures protection of human health and the environment." The remedial action must achieve a level of cleanup that at least attains those requirements that are legally applicable or relevant and appropriate. In performing the FYR for compliance with ARARs, only those ARARs that address the protectiveness of the remedy are reviewed. • Applicable requirements are those cleanup standards, standards of control, and other substantive requirements, criteria or limitations promulgated under federal environmental or state environmental or facility siting laws that specifically address a hazardous substance, remedial action, location, or other circumstance found at a CERCLA site. • Relevant and appropriate requirements are those standards that, while not "applicable," address problems or situations sufficiently similar to those encountered at the CERCLA site that their use is well suited to the particular site. Only those state standards that are more stringent than federal requirements may be applicable or relevant and appropriate. • To-Be-Considered (TBC) criteria are non-promulgated advisories and guidance that are not legally binding but should be considered in determining the necessary remedial action. For example, TBCs may be particularly useful in determining health-based levels where no ARARs exist or in developing the appropriate method for conducting a remedial action. Chemical-specific ARARs are health- or risk-based numerical values or methodologies which, when applied to site-specific conditions, result in the establishment of numerical values. These values establish an acceptable amount or concentration of a chemical that may remain in, or be discharged to, the ambient environment. Examples of chemical specific ARARs include Maximum Contaminant Levels (MCLs) under the federal Safe Drinking Water Act and ambient water quality criteria enumerated under the federal Clean Water Act (CWA). Action-specific ARARs are technology- or activity-based requirements or limits on actions taken with respect to a particular hazardous substance. These requirements are triggered by a remedial activity, such as discharge of contaminated groundwater or in-situ remediation. Location-specific ARARs are restrictions on hazardous substances, or the conduct of the response activities solely based on their location in a special geographic area. Examples include restrictions on activities in wetlands, sensitive habitats, and historic places. Remedial actions are required to comply with the chemical specific ARARs identified in the ROD. In performing the five-year review for compliance with ARARs, only those ARARs that address the protectiveness of the remedy are reviewed (Tables H-l through H-5). H-l ------- Table H-l: Chemical Specific ARARs Standard, Requirement, or Criterion Description Citation WATER REGULATIONS (Safe Drinking Water Act - 40 USC ' 300; Clean Water Act - 33 USC Section 1251-1376) Federal Groundwater Classification Federal classification system to establish groundwater usage categories for aquifers as part of a groundwater protection strategy. 55 FR Part 8733 National Primary Drinking Water Regulations Establishes maximum contaminant levels (MCLs) for specific chemicals to protect drinking water quality. 40 CFR 141.61 Effluent Guidelines and Standards: Pretreatment Standards Discharges of extracted/treated Groundwater will be subject to Pretreatment requirements if discharged to the publicly owned treatment works. 40 CFR 403 South Carolina MCLs in Drinking Water Establishes maximum contaminant levels (MCLs) for specific chemicals to protect drinking water quality. SCDHEC R. 61- 58.5 H-2 ------- Table H-2: Location Specific ARARs Standard, Requirement, or Criterion Description Citation Fish and Wildlife Coordination Act The Act allows the Department of Agriculture and Commerce to assist Federal and State agencies to study the effects of domestic sewage, trade wastes, and other polluting substances on wildlife. 16 USC Sections 661 to 667e Protection of Wetlands Requires federal agencies to take action to avoid adversely affecting wetlands, to minimize wetlands destruction, and to preserve the value of wetlands. (Executive Order 11990; 40 CFR 6.302 (a); 40 CFR Part 6, Appendix A) Table H-3: Action Specific ARARs Standard, Requirement, or Criterion Description Citation Installation of Monitoring Wells Requirements for installation of wells SC Well Standards (R.61-71) Groundwater ARARs The 1998 ROD for OU-1 and the 2002 ROD for OU-2 identified multiple potential chemical specific ARARs for groundwater. However, only the following ARAR was used as basis for selection of groundwater cleanup goals: • National Primary Drinking Water Standards (MCLs) (40 CFR Part 141, Subpart B and G) Several compounds did not have MCLs and risk-based numbers were derived for these compounds (see the toxicity review for these compounds in Appendix I). This FYR compared groundwater ARARs in the 1998 ROD for OU-1 and the 2002 ROD for OU-2 against the current values of these ARARs (see Table H-4). None of the ARARs have changed with the exception of arsenic. However, arsenic was removed from the COC list in 2002, as the EPA and SCDHEC agreed that arsenic should be removed from the COCs based on the limited number of groundwater samples with arsenic concentrations above the MCL of 0.01 mg/L and the potential contribution of arsenic from non-site sources. In addition, no new MCLs have been established for those remedial goals originally based on risk. H-3 ------- Table H-4: Groundwater ARAR Review Contaminant Media/OU ROD Cleanup Levels (Hg/L)a Current ARAR (MCL) (Hg/L)b ARARs More or Less Stringent than Cleanup Levels? Arsenic Shallow Groundwater/OU-1 50 10 More stringent Cyanide Shallow Groundwater/OU-1 200 200 No change Benzene Shallow Groundwater/OU-1 Intermediate Groundwater/OU-2 5 5 No change Benzo(a)pyrenec Shallow Groundwater/OU-1 Intermediate Groundwater/OU-2 0.2 0.2 No change Ethyl benzene Shallow Groundwater/OU-1 Intermediate Groundwater/OU-2 700 700 No change Beryllium Shallow Groundwater/OU-1 4 4 No change Leadd Shallow Groundwater/OU-1 15 15 No change Mercury Shallow Groundwater/OU-1 2 2 No change Chromium Shallow Groundwater/OU-1 100 100 No change Copper Shallow Groundwater/OU-1 1300 1300 No change Toluene Shallow Groundwater/OU-1 Intermediate Groundwater/OU-2 1000 1000 No change Xylenes (total) Intermediate Groundwater/OU-2 10000 10000 No change Notes: a) Cleanup goals from 1998 OU-1 ROD and 2002 OU-2 ROD. b) Listed values are MCLs from https://www.eDa.gov/ground-water-and-drinking-water/table-regulated-drinking-water-contaminants, accessed 1/08/24. c) Represents PAHs as a group. d) Lead is regulated by a treatment technique that requires systems to control the corrosiveness of their water. If more than 10 percent of tap water samples exceed the action level, water systems must take additional steps. For lead, the action level is 15 ng/L. \|jg/L = micrograms per liter H-4 ------- APPENDIX I - TOXICITY ASSESSMENT Groundwater Cleanup Goals Toxicity Assessment No new exposure pathways were identified. No new methodologies to determine risk more accurately were identified during this Five-Year Review. Groundwater cleanup goals based on the National Primary Drinking Water Regulations MCLs were evaluated in Appendix H and are not addressed further. 2,4-Dimethylphenol, carbazole, chrysene, naphthalene, and nickel use health-based values for the cleanup goal.9 To evaluate whether the health-based cleanup goals remain valid, the cleanup goals without current MCLs were compared to the EPA's RSLs for tapwater. The RSLs for cancer are chemical-specific concentrations for individual contaminants that correspond to an excess cancer risk level of 1 x 10"6 (or a hazard quotient of 1 for non-carcinogens), and they have been developed for a variety of exposure scenarios (e.g., residential, commercial/industrial). RSLs are not de facto cleanup standards for a Superfund site, but they do provide a good indication of whether actions may be needed to address potential human health exposures. The EPA acceptable risk range is between 1 x 10"6 and 1 x 10"4. RSL values that are within this range are determined from a risk standpoint to be acceptable. Remediation levels (RLs) are chosen by the risk manager for COCs and are included in the Proposed Plan and the ROD. These values, derived from site specific Remedial Goals or chemical specific ARARs, are considered the levels the remedial action needs to achieve in order to be protective of human health risks. If a chemical specific risk-based value other than lxlO6 for carcinogens or HQ of 1 is recommended and/or selected as the RG, the FS, Proposed Plan, and ROD should provide a justification. As shown in Table 1-1, the health-based cleanup goals remain valid except for the noncancer risk from 2,4-dimethylphenol and the noncancer and cancer risk from naphthalene. Tapwater RSLs are conservative screening levels for drinking water, and the groundwater at the Site is not used for drinking; therefore, this does not affect current protectiveness. However, the cleanup goals for naphthalene and 2,4-dimethylphenol do not correspond to risks within the EPA's acceptable risk range; the EPA may reevaluate these cleanup goals to determine if they warrant updating. Table 1-1: Review of Groundwater Cleanup Goals Groundwater COC Media/OU ROD Cleanup Goal Tap Water RSL3 Cancer Riskb Noncancer Hazard Quotient (HQ)C 1 x 10"6 Risk HQ-1.0 2,4-Dimethylphenol Shallow groundwater/OU-l & Intermediate groundwater/ OU-2 700 - 360 - 2 Carbazole Shallow groundwater/ OU-l & Intermediate groundwater/OU-2 5 - - - - Chrysene Sha How ground water/ OU-l 20 25 - 8.0 X 10 7 - Chrysene Shallow groundwater/ OU 1 200d 25 - 8.0 X 106 - Naphthalene Shallow groundwater/ OU-l & Intermediate groundwater/ OU-2 1,500 0.17 6.1 8.8 X 10'3 246 Nickel Shallow groundwater/ OU-l 100 - 390 - 0.3 Notes: a. Current EPA RSLs. dated November 2023. are available at httD://www2.eDa.eov/risk/risk-based-screenine-table- seneric-tables (last accessed 1/9/2023). b. The cancer risks were calculated using the following equation, based on the fact that RSLs are derived based on 1 x 10 6 risk: cancer risk = (cleanup goal cancer-based RSL) x 10 6. c. The noncancer HQs were calculated using the following equation: HQ = cleanup goal noncancer based RSL. d. The ROD cleanup goal for chrysene was 20 ng/L, but the June 2018 Shallow Groundwater Monitoring Report notes that the chrysene cleanup goal was changed to 200 ng/L and that this was approved in a SCDHEC letter dated May 23, 2002. Both values are reviewed in this screening-level risk evaluation. e. Nickel as soluble salts. - = EPA has not yet established toxicity values. Bold = exceeds EPA's acceptable carcinogenic risk range (1 x 104 to 1 x 10-6) or the noncancer HQ of 1. ug/L = micrograms per liter 9 The cleanup goal for nickel was originally MCL-based, but nickel no longer has an MCL and is therefore evaluated with health-based cleanup goals. 1-1 ------- Vapor Intrusion Screening Level Risk Assessment VOCs are present in groundwater at the Site. This FYR evaluates whether there are unacceptable risks from the vapor intrusion pathway based on current toxicity information and groundwater data. A screening-level vapor intrusion evaluation was performed using the most recent groundwater data from May 2023 under a commercial exposure scenario. The highest groundwater concentrations of each contaminant from the shallow wells were compared to conservative Vapor Intrusion Screening Levels (VISLs). The results of the screening indicate that the cumulative risk for all contaminants is within the EPA's risk range of 1 x 10~6 to 1 x 10~4 and equals the cumulative noncancer hazard quotient (HQ) target of 1 (Table 1-2). Table 1-2: Vapor Intrusion Evaluation - From April 2019 to April 2023 Maximum Concentration VISL Calculator13 coc from Shallow Welis in May 2023 (pg/L)a Predicted Indoor Air Commercial Concentration (p.g/m3) Cancer Risk Noncancer HQ Benzene 139 31.5 2.01 x 10"5 2.40 x 101 Ethyl benzene 47.7 15.4 3.13 x 10"6 3.51 x 10"3 Toluene 14 3.8 - 1.74 x 10"4 Total xylenes 66.6 18.1 - 4.12 x 10"2 Totals: 2.32 x 10"5 2.85 x 101 Notes: a. Maximum concentration for each COC from this sampling event used. Only detected volatile contaminants were included in this evaluation. Groundwater data are from Table 6 of the Shallow Groundwater Monitoring Results May 2023 Event Report. lb. Only volatile contaminants with established toxicity criteria for indoor air are included in this evaluation. VISL calculator last accessed 1/9/2024 at https://www.epa.gov/vaporintrusion/vapor-intrusion screening level- calculator using default assumptions. - = cancer risk could not be calculated; toxicity values not established jxg/m3 = micrograms per cubic meter Hg/L = micrograms per liter The above VISL evaluated the maximum concentrations in May 2023. Prior to annual sampling, there was a seasonal trend at MM-03A in which concentrations were highest in December. With the start of annual monitoring, the overall trend in MM-03A has been downward with a slight rise in April 2022. Well MM-03A is located near the control building on the SCE&G property; therefore, this FYR also evaluated the potential for vapor intrusion at the control building. As noted in the Site's 2009 Assessment of Vapor Intrusion report (Technical Memorandum #004), the control building is used to house electrical equipment and is highly ventilated to maintain appropriate operating temperatures. The building is not occupied on a full-time basis but is used intermittently to perform required maintenance and monitoring tasks. Therefore, there is no complete vapor intrusion pathway in the control building, despite the presence of volatile groundwater contamination near the building. Soil PRG Toxicity Assessment Soil PRGs were based on risk rather than chemical specific ARARs. To evaluate whether the risk-based PRGs remain valid, the PRGs were compared to the EPA's RSLs for a composite worker. RSLs incorporate current toxicity values and standard default exposure factors. As shown in Table 1-3, the soil PRGs remain valid because they correspond to risk below or within EPA's carcinogenic risk range of 1 X 10"6 to 1 X 10 4 and below the target noncancer HQ of 1. 1-2 ------- Table 1-3: Review of Soil Cleanup Goals - Commercial Soil PRG ROD Cleanup Goal (rng/kg) Composite Worker RSL5 Cancer Risk0 Noncancer Hazard Quotient (HQ)C 1 x 10 6 Risk HQ-1.0 Arsenic 7.6 3 480 2.5 x 10"6 0.02 Benzo(a)pyrene (EQ) 1.7 2.1 220 O T 1 X T 1 o6 0.008 Notes: a. Current EPA RSLs, dated November 2023, are available at http://www2.epa.gov/risk/risk-based-screening-table- generic-tables (last accessed 1/9/2023). b. The cancer risks were calculated using the following equation, based on the fact that RSLs are derived based on 1 x 10 6 risk: cancer risk = (cleanup goal cancer-based RSL) x 10 6. c. The noncancer HQs were calculated using the following equation: HQ = cleanup goal -- noncancer-based RSL. mg/kg = milligrams per kilogram The 2019 FYR evaluated the need for soil institutional controls on properties other than the SCE&G property and determined institutional controls on other site properties are not warranted. To determine whether the PRGs used for soil remediation continue to be protective of residential use (and therefore would not require institutional controls), a review of the soil cleanup goals was conducted by comparing the PRGs to the EPA's current RSLs for a residential exposure scenario. As shown in Table 1-4, the soil PRGs remain valid as they correspond to risk within the EPA's carcinogenic risk range of 1 x 10~6 to 1 x 10~4 and below the target noncancer HQ of 1. Therefore, institutional controls on other site properties are not warranted. Soil PRG ROD Cleanup Goal (rng/kg) Resident - RSL3 Cancer Riskb Noncancer Hazard Quotient (HQ)C 1 x 10 6 Risk HQ-1.0 Arsenic 7.6 0.68 35 1.1x10-5 0.02 Benzo(a)pyrene (EQ) 1.7 0.11 18 1.5 x 10-5 0.09 Notes: a. Current EPA RSLs, dated November 2023, are available at http://www2.epa.gov/risk/risk-based-screening-table- generic-tables (last accessed 1/9/2023). b. The cancer risks were calculated using the following equation, based on the fact that RSLs are derived based on 1 x 10 6 risk: cancer risk = (cleanup goal cancer-based RSL) x 10 6. c. The noncancer HQs were calculated using the following equation: HQ = cleanup goal noncancer-based RSL. mg/kg = milligrams per kilogram Sediment Cleanup Goal Review The 2002 OU-2 ROD stated that the remedial goal for sediments was to address PAH-contaminated sediments with ESGTU HQs that were greater than 1. The 2002 ROD used the equilibrium sediment benchmarks from the EPA's 2000 guidance on Equilibrium Partitioning Sediment Guidelines for the Protection of Benthic Organisms: PAH Mixtures (EPA Final Draft dated April 5, 2000). These values were compared to the sediment benchmarks in the EPA's updated 2003 guidance; the values have not changed since 2000 (Table 1-5). 1-3 ------- Table 1-5: Review of Sediment Cleanup Goals PAH Equilibrium Sediment Benchmark in 2002 ROD3 (M-g/g) Current Equilibrium Sediment Benchmark15 (M-g/g) Benchmark Change 2-Methylnaphthalene 447 447 None Acenaphthene 491 491 None Acenapbthylene 452 452 None Anthracene 594 594 None Benzo(a)anthracene 841 841 None Benzo(a)pvrene 965 965 None Benzo(b)fluoranthene 979 979 None Benzo(e,h,i)perylene 1095 1095 None Benzo(k)fluoranthene 981 981 None Carbazole 349 349c None Chrysene 844 844 None Dibenzo(a,h)anthracene 1123 1123 None Fluoranthene 707 707 None Fluorene 538 538 None Indeno(l,2,3-cd)pyrene 1115 1115 None Naphthalene 385 385 None Phenanthrene 596 596 None Pyrene 697 697 None Notes: a. From Table 5-6 of 2002 ROD referred to as the critical concentration of PAH in sediment identified in EPA 2000 guidance. b. Values from Procedures for the derivation of equilibrium partitioning sediment benchmarks (ESBs) for the protection of benthic organisms: PAH mixtures. EPA-600-R-02-013. Office of Research and Development, Washington, DC. 2003. https://nepis.epa.gov/Exe/ZvNET.exe/30006DOD.TXT?ZvActionD=ZvDocument&Client=EPA&lndex=2000 +Thru+2005&Docs=&Querv=&Time=&EndTime=&SearchMethod=l&TocRestrict=n&Toc=&TocEntrv=&Q Field=&QFieldYear=&QFieldMonth=&QFieldDav=&lntQFieldOp=0&ExtQFieldOp=0&XmlQuerv=&File=D% 3A%5Czvfiles%5Clndex%20Data%5C00thru05%5CTxt%5C00000006%5C30006DOD.txt&User=ANONYMO US&Password=anonvmous&SortMethod=h%7C- &MaximumDocuments=l&FuzzvDegree=0&lmageQualitv=r75g8/r75g8/xl50vl50gl6/i425&Displav=hpf r&DefSeekPage=x&SearchBack=ZvActionL&Back=ZvActionS&BackDesc=Results%20page&MaximumPage s=l&ZvEntrv=l&SeekPage=x&ZvPURL (last accessed 1/9/2024) c. A value was not established so the lowest benchmark was selected. (ig/g = microgram per gram 1-4 ------- APPENDIX J - SHALLOW GROUNDWATER DATA J-l ------- Table J-1: Shallow Groundwater Monitoring Locations Wells Location Sentinel Wells DW-04 South Carolina Ports Authority LM-03A Former Luden's Property LM-10AR Former Luden's Property MW-07AR National Park Service Property MW -" 4 National Park Service Property MW-33 National Park Service Property Aqueous Plume Weils LM-OIAR Former Luden's Property LM-02A Former Luden's Property MM-02 A DESC Substation MM-03 A DESC Substation MRVV-U I National Park Service Property MRW-02 National Park Service Property MZ-02AR DESC Substation Note: Sentinel wells are sampled on a biennial basis and were not sampled in 2021 or 2023. J-2 ------- Table J-2: Summary of Groundwater Analytical Parameters and Methods REQUIRED ANALYTICAL DETECTION CLEANUP CONSTITUENT METHOD LIMIT (mg/L) GOAL (mg/L) Volatile Organic Compounds Benzene 8260B 0.005 0 005 Ethyl benzene 8260B 0.005 0 7 Toluene 8280B 0.005 ! 0 Xylenes, Total 8260B 0.005 _ PAH Constituents Acenaphthene 8270D 0.01 _ Anthracene 8270D 0.01 _ Benzol a jpyrene 8270D 0.0002 0.0002 Carbazole 8270 D 0.005 0.005''' Ghrysene 8270D 0.01 0.2 Fluorantfiene 8270D 0.01 - Fluorene 827QD 0.01 _ Naphthalene 8270D 0.01 Phenanthrene 8270D 0.01 - Pyrene 8270D 0.01 - Phenolics 2,4-Dimethylphenol 8270D 0.01 Inorqanics Cyanide yo a 0 2 1. Field measurements included pH, specific conductance, temperature, dissolved oxygen, turbidity, and redox potential. 2. Quality assurance/quality control (QA/QC) samples included one equipment blank, one trip blank per sample delivery group (VOCs only), one blind field duplicate and one matrix spike (MS)/matrix spike duplicate (MSD). 3. (1) - Revised cleanup goal of 0.053 mg/L proposed (MTR letter dated May 15, 2002). 4. (2) - Cleanup goal modification approved (SCDHEC letter dated May 23, 2002). J-3 ------- Table J-3: Benzene Historical Analytical Results - Aqueous Plume Wells Sample Date Units LM-01AR01 LM-02A MM-02 A MM-03 A MRW-01 MRW-02 MZ-02AR January 1994 MSt- 98 100 390 5.200 - - - Sept/Oct 1997 pgt- - 5 U - - - - - February 1998 Pg/L — — - - — — — April 1993 pg-i- - - - — - - - May 1998 pgi- - - - — - - - July 1998 Pgrt- - - - — - — — October 1998 pg'L 59 130 J — — - — - Nov/Dec 1998 pgt- 100 5 U 7 6.500 - - - March 1999 pg/L — — — — — — — June 1999 pg'L — - — — - — Aug/Sept 1999 pg'L - - - — - - - July 2000 pgfl- - 0.8 J 120 9.000 300 5U« — December 2000 pgi- 190 22 8 4.200 220 SU 4.200/3,700 March 2001 pgi- 150 SU 24 1.BOO 220 SU — June 2001 pgt - 5U/5U 13 7.900 - SU 4,000 September 2001 pg/L 54 34 10 3,700/3,800 — SU 3,000 December 2001 Pg'L 7 5 U 5 U 1,900 - 5 U 2.DOO/1.BOO March 2002 pgi- 7 5 Li 8 1.160/1.170 - SU 3.770 June 2002 pgt- 7 5 (J 10 8,310 1,050 7 3.840/3,770 September 2002 pgt- 17 5 U 11 1.200 1.300 5 U 1.000 December 2002 WjA- 99 5 U 20 1,900 310 5 U 200 March 2003 pgfl- 170 5 U 18 160 460 SU 680 June 2003 pgJL 46 5 U 10 270 700 5 U 150 September 2003 pg/L 35 5 U 25 1,100 1,500 8.2 33 December 2003 rafl- 5 U 14 8.4 6,900 260 SU 440 March 2004 180 5 U 15 680 440 s u" 320 June 2004 ugA. 5 U 5 U - - 860 5 U — September 2004 pgfl- 5 U 5 U 11 180 1.000 5.5 13 December 2004 pg'L 5 U 5 U - — 360 J SU - March 2005 pg/L 21 SU 14 1,100 460 SU 220 June 2005 pg/L 5 U 14 — 650 SU — September 2005 pgfl- 5 U 5 U 7.3 7 1,100 7 31 December 2005 pg/L 5 U 5 U - - 290 5 U - March 2006 pg'L 5 U 39 11 220 460 SU 71 June 2006 pg'L 5U 5U - - 510 5 U - September 2006 ng/L 5 U SU 12 380 750 J SU 76 December 2006 pg/L 5 U SU - - 360 SU - March 2007 5 U SU 24 640 220 5 U 400 June 2007 pgi- - - - — — - - September 2007 pgfl- - - - — - - - Deoember 2007 Pg/L 12 5 (J 12 3,600 75 SU 90 September 2008 pgt 96 5 U 10 320 300 SU 23 June 2009 pgi 50 5 U 9.8 5 U 600 5 U 450 March 2010 pgi- 120 9.6 38 160 370 5 U 280 December 2010 pg«- 5 U 5 U 15 7.300 300/300 SU 64 September 2011 pgfl- 200 SU 19 4.100 590/510 5 U 220 June 2012 pgA- 8.8 SU 17 150 420/430 5U 14 March 2013 PS^L 5 U SU 14 650 130/110 SU 160 December 2013 PO'L 31 SU 14 4,200 340/340 5 U 65 September 2014 pg/L 5 U SU 6 62 820/830 SU 100 June 2015 WL 151 SU 11 151 574/54 9 SU e March 2016 pgl- 51 5 U 5 U 5 U 291/266 SU 25 Deoember 2016 pg/L 134/157 5 U s u 3440 263 SU SU September 2017 PB/L 88 J/55 J 5 UJ s u 334 611 5 U 6.5 June 2018 pg/t 80.8 f 79.9 5 IJ 6.3 61 258 SU 194 April 2019 pg/L 64.8 / * SU e 4,270 168 5 U SU April 2020 pgfl- 89.4/ 101 5 U 12.7 180 121 SU "313 April 2021 pg/L 155 ' 154 5 U 5.4 177 295 5 U 5 U April 2022 pgfl- 55.7/54.4 SU 5 U 1,080 220 5 U 19.7 May 2023 pg/L 6.0/5.7 5 U 5 139 77.3 SU 5 U Notes: L Replacement Well. 2. Sample collected August 2000, 3. U - Indicates that the constituent was not detected at the reporting limit. 4. J - Indicates an estimated value. The constituent was identified between the reporting limit and method detection limit, or the result was qualified based on the data evaluation. 5. UJ - Indicates that the constituent was not detected above the reporting limit and the result was qualified as estimated during data evaluation. J-4 ------- Table J-4: Naphthalene Historical Analytical Results - Aqueous Plume Wells Sampie Date Units IM-01AR " LM-02A MM-02A MM-03A MRW-01 MRW-02 MZ-32AR'"' January 1994 f^L 700 J 1,300 17 5,£00 - - - Sept/Od 1907 - 29 - - - - - February 1996 P0L — — - — - - - Apnl T9&B wt - - - - - - - May 1998 - - - - — - - Jtiyl9&8 - - - - - - - October 1998 52 30 J — — — — — ^JovOec 1998 t»9/L ISO io u 10 u 5,000 - - - March "999 - — — - — - IT June 1999 pg/L — - — — - - AugfSept 1999 pjjfL - - - - - - - Jiiy2900 -O'L - 3 J 78 3,900 530 sir' - December 2000 1,300 io u io u 3,100 17 10 u iou/iou Maich 2001 W'- 620 10 u 10 UJ 1,400 J 28 10 u - June 2001 WfL — io urio u io u 3,200 — 10 u 10 UK September 2001 310 26 10 u JiJUU JM CJW) J - 10 u 810 December 2001 tifl/L 110J 10 UU 10 u 3,000 — 10 u 170 J/10 UJ March 2002 WfL 66 10 u 10 u 840 J/660 J — 10 u 710 June 2002 (igfL 37 10 u 10 u 2,000 940 10 u aid J/1200 j September 2002 vgtL 11 10 u 10 u 400 1,900 10 u 59 December 2002 WTL 78 10 UJ 10 u 2,200 160 J 10 UJ 10U Man* 2003 2,500 J 10 u 10 u 10 u S3 10 u IfiU June 2003 10U 10 u 10 u 53 770 10 u 10U September 2003 10 u 10 u 10 u 1,400 3,600 10 u 10U December 20QCJ 10U 23 10 u 2.600 10 u 10 u 10U March'2004" vqfi 260 10 u 10 u 66 910 10 u ibu June 2004 ItfL 10 u 10 u - - 2,500 io u - September 2CXM jig/L 10 u 10 u 10 u 10 U 1,800 12 10U Itecember 2004 PtfL 10U iou - - 10 u 11 - March 2005 M)N- 32 10 u io u 370 1,900 J 12 1QU June 2005 W- 10U 10 u — — 1,000 10 u — September 2035 MgC 10U 10 u 10 u 10 u 6,400 18 1QU December 2005 10 u 10 u - - 34 io u - March 2006 itgfL 10 u 64 fiA® 10 u 440 J 10 u ¦ 0 u June 2006 I^L 10 u 10 u - - 770 J 10 u - September 2006 10 u 10 U 10 u 10 u 2,700 10 u 10U December 2006 MBfL 10 u 10 u - - 280 J 10 u - March 2007 W- 10 u 10 u 10 u 190 J 10 u 10 u 10U bune 200? — — — — — - — September 2007 pgA. - - - - — - - December 2007 ug. 44 10 u 10 u 1,700 21 10 u 10U September 2006 WTL 203 10U ib u 17 J ^13X5 10 u 10 u June 2009 Wt- 10 u io y 10 u 10 u 10 u 10 u 34 March 2010 PtfL 120 "iS iou 26 920 WD ?1 December 3010 S^L 10 u 10 u 10 u 4,400 710/730 10 u 13 Seplem ber 2011 ug'i- 390 io uj 10 u 2,900 3,1003100 io u 7t June 2012 26 25 U 10 u 10 u 330/350 10 u 10U March 2013 MIL 10 D 10 u 10U 10 u 320/340 10 u IOU December 2013 44 10 u 10 u 3,200 ioiy« u 10 u 14 J September 2014 10 u ib u 10 u 10 u 1,0QOf920 10 u ' 0 U June 2015 326 10 u 10 u 24 810/818 10 u 10 u March 2016 -3'l. 86 10 u 10 u 10 u 199/122 50 L 10 December 2016 SJflfL 400434 10 u 10 u 3190 J 220 io u 10 u September 2017 \|ig/L 355 J/282 J 11 UJ io u 153 768 10 u 10 u Jtne 2018 Wift- 405/354 10 u 10 u '4 218 ¦ J 10 u Apni 2019 WL 2?6 1 290 10 u 10 6.130 10 U 3& 1 9.8 U April 2020 \w- 209 1 190 9.6 U 9.7 U 71.5 «S2 12 u 9JU Apr 2021 247 i 237 9.9 U 9.6 2SJI 218 9 7 LI 9.7 " Aprs 2022 \igft- 5.9 UJ / 213 J 10 u 10 u 991 98 U 10 u 9.8 U May 2Q23 tMVL 12.6/ 13.5 10 u 0.7 U 9.7 U 390 9.7 U 9.7 U Notes: 1. 2, 3, 4. Replacement Well. Sample collected August 2000. U - Indicates that the constituent was not detected at the reporting limit. J - Indicates an estimated value. The constituent was identified between the reporting limit and method detection limit, or the result was qualified based on the data evaluation. UJ - Indicates that the constituent was not detected above the reporting limit and the result was qualified as estimated during data evaluation. J-5 ------- SCSPA PROPERTY SCSPA ELECTRICAL, SUBSTATION CHARLOTTE STRl CONTROL BUILDING APPROXIMATE LOCATION OF RETAIL BUILOING Dfiw-08 (4.13) LUDEN'S MARINE DRW 40 14.53) DRW-3S ,I«.99) j UWjVJ. -U.09)- MWH -(23?)— ' ' HF RO -DHW-48 . (2.90) onw-50." (2.8S) (1.29) LIBERTY 9BUARE (i3b) \| GROUNDWATER FLOW DIRECTION (COLOR BLUE IS SEGMENT FOR HYDRAULIC CONDUCTIVITY ESTIMATE). DASHFD WHFRF INFFRRFD SOUTH CAROLINA AQUARIUM APPROX LOCATION OF TOUR BOAT FACILITY DOMINION ENERGY SOUTH CAROLINA, INC. GROUNDWATER SAMPLING LOCATIONS AND GROUNDWATER ELEVATION CONTOURS FOR MAY 23. 2023 CALHOUN PARK AREA SITE CHARLESTON. SOUTH CAROLINA FILE NAME SGWCONQ523 APEX COMPANIES, LLC CHARLESTON GATEWAY CENTER CITY OF CHARLESTON PARKING GARAGE LEGEND SENTINEL WELL GROUNDWATER SAMPLING LOCATION AQUEOUS PLUME WELL GROUNDWATER SAMPLING LOCATION WELL OR PIEZOMETER GROUNDWATER ELEVATION (FEET. NAVD 88. REFERENCED TO MLSL) GROUNDWATER ELEVATION CONTOUR (FEET). DASHED WHERE INFERRED NOTES 1. GROUNDWATER CONTOURS WERE GENERATED USING SURFER VERSION 23 AND ADJUSTED WHERE APPROPRIATE (I E BOUNDARIES). 2. AQUEOUS PLUME WELLS SAMPLED ANNUALLY STARTING IN APRIL 2019 3. SENTINEL WELLS SAMPLED BIENNIALLY STARTING IN SECOND QUARTER 2020 4 THE GROUNDWATER ELEVATION AT A3-T3 APPEARS TO BE ANOMALOUS AND WAS NOT USED IN COUNTOUR DEVELOPMENT Figure J-1: Shallow Groundwater Sampling Locations J-6 ------- Figure .1-2: Average Benzene and Naphthalene Concentrations with Time from Aqueous Plume Wells - LM-01AR, LM-02A, MM-02A, MM-03A, MRW-01, MRW-02, & MZ-02AR J-7 ------- Table J-5: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) TiST TOO Volume IQOO A 'h ftauui'alfi 0,2 ¦ >'r ... ' 5 200 ttttt FLcra>«,w TT li I.J. [l4oj * i'.ne-a' O^e,, >500 — ttt; ^SX 200 B—wo Gad bet E TT 5 LI TTT Tj 5 TTT TT TTT TFTT 5 J w ' 5 LI TIT TT TTT Tj TTT JUL TT TT 5 Ll TUT TTT 5 J TTT TTT HH Tj "TTT TT TT TT TT 5 U TIT JUL TT v> ^TT Si TBI/ irru iU HaL •. i i h u iU JUL JU JUl Ili u JUL JUL. _ULU JUL JUL JIU. 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J JUL 10 I, TT 10 LJ TT TTT TT ir. li TiT U TT JM1AR TT _u u _ JUL JJ L J - JJ_ J_ JUL JU_ J-J- JUL JUL JUL JUL 44 JUL j2_ii UU _UL_ M-OIAR mTTT- 5 U TT 5 U T 5 U 5 J IT" 21 io u TT io u Ttr 10 J TT io J TT 10 Ll TT io j TT 10 J TTT io u UT TT 10 L TT 10 Ll ~W7 io u TT ID J TT 10 J T— 10 Ll TIT io u TTT 266 "SSTlTI taiaa josam. _ JJL Jk JUL JUL L3LU i n __ JU_ jiu. jjm» JUL 1f ! 10 u JUL JUL JUL JUL JJL JM 33 iS T 2L ir ¦W T 10 li "TFa M TTTTT 10 J \|V II 3b ftfr -m- ¦ttf <00" 17. fx '1 J J5L. 19 M^IAR m- Off g\| IE * iiu 269 JU JUL JUL ia u IB u isr •m ¦i- JUJL us J 10 u 10 u JjA * * 133 U 10 U io u •m Nfl NA 14 3 # rsr > 1 - If _ai_ J£i_ 204 * u_ 0 u JU TT 10 J TBT ?64 3T 93 U T!TT NA Nm 3C JE ¦Wtt HO -36- 3T 3K IJJ -JUL sa u "TTlT ili 9 8 C 310 T3 230 Jt 3S2 TTu JUL JU. TTU -ES3. J-8 ------- Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) 4'1 SQCE2 I J-9 ------- Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) TTC7T TOO lOoO V.f-tWMWl o? Soituvb} 5c^z»ig.r;.i 5 Cf/ysuic 20) EST ffiSTESw '-1-teri 1500 I yrrfwr ypQ ?oo "ieanuo Goal (J»L mWT • ii" >™ usaasai. Tar ITT "55" TT -ra- TT 1ST "iT- ttt Tarr TT Tyrr TRTT "nrrr TTT "mr ~m- T3" "wrr Ulflifi- TT -UL Hhr ¦%T j& T -,T ftr jsj. ju JSL as- .MtHA IMBJi JQCT153E ?v TTT su TT "TIT JJ. T5T" 5 J TT JUL 1W MA TB MA .Mil? A 3u\| sir ~7 JUL : J jj^. . J I? I1 t '' ! J JJJL ¦: i- ig ¦.' 10 J HZ ju. J5_ JU- JU. Jii JU. JU. -UL i a u JTBT vn.-A" TTT T77 TU TT TiJ —7 15 TB"u 13 L TT 10 u Jjui. 10 J Tiu 10 J "ToU HEZ TOT JjU JUL H U «¦: - JSLJL ICtT — -— _J0_U ToTT JliL TflU jDZ tott 2SHL • - •. 1M rau ifllj jEI ID J jJEE iFu EDI JM IE! LM-O/A JM LM-02A >>Ui 5 J TTT 5 J "TTT TTT 15 TT 10 u ir-n 10 L. 13 J 10 ll ttt io j -rmr 10 J IP in io j i ttt ie iB Li J 10 J Tfq 10 llJ 10 u TTTT3 10 J Ttg tt- 10 J irrrq 10 LI tti 10 U' Tra sir •] u. — ¦44 5 U -n H J'S V. tt _J ± -n- m — ¦m -u -b m -^r HW -m -m -m TlT TJ TS U iu L 10 y 10 L "m J IJ LI 10 J EES 1 u u -nnr -rnr "Toir "TTTTT inr "Tfnr T7TT TTTT "RTTJ _12£1 - 1 ift U.I i.Li, mm \L 10 L J-i—L ' : n II, _J m n nro LMflZA -Mici 33T5Z TTT 5 LI —rr ~^¦ 10 II TTt7 10 u 10 u 10 L 10 LI m Li 10 J 10 u 10 u 10 u i ;i J 10 J "nnr ~iTT TTT TT 10 U' i-j J t u 1 ' J 10 L' i' u 10 J 1 I J ¦ ! , _¦ IM41?» _Lu. n: I IP u K1 ' l IJ i. in o ¦•' i' IC I: IM 1 l'l U I -* 'I I'-' H I J 11 M 02A lmTT ~r~r TT 5 J TT s u TT 13 10 U 10 u i e 6 10 il TTT 10 u TT 10 IJ TTT 10 J T5T 10 K ir LI 10 IJ 10 .1 IC u TTT 10 J TuT 10 'L 10 u TTT 10 Ul TTT « i) TTT 10 J to J i'J J I ¦ . 10U1 TTT j leu I I _i L la ij 10 U 1"11 10 u 10 10 u 10 u I'J 'J 10 1.1 I't* II m- TTT SJJ — 10 u -irtr J0JL M J0J 10 LI W ¦M JOJJ 10 u "iTT M '0 u LM-iPA 3.WQJ5 S II ^ u $ u S L' 10 u 10 u 10 u ID U ID U 10 y 10 u jiLki 10 u >0 u 10 u 10 u >0 u 0 J 13 U IC u 10 u ¦' ' LM-flPA nmr 5 U "Tu 32 ML 14 -TTTTT 10 u ia u 10 v i " 10JJ TTT 10 (J TTT7 10 [i jTT" 10 u 322 Trrr 10 u TTT in j TTT 10 Ll T5TT jg_u 10 u 10 J JfiJJ m a Jim. -Lit -iO. -JiLk '?U JSUL _L1L^ JSAL JO. 02JJ 'g.iy., .'8 V. JSM _!iH JOJi J - _HUi .M-02A I tror 3F1KB TTT TT 5 J TT 10 u -mr 10 u Ki ;i 10 u 10 u -nrrr 10 lil -urn 10 LI TTT 10 t TTT" 10 U TTT 10 u n i N Jl TT TTT urn IC LI TT 10 J "TTT 10 u IE " -ILL IB.I,' 'Q '-i JOji ¦0 u m u JUL IJ u ia.u, »a u im JOJi 10 U IP U ,_M i latoxe s J S J 10 u 10 u TTT 10 t j ' 10 u IB li lOJl TTT 10 J TTTT IC U TTT 10 u TT lOUl nnT _j TIF TU S~J 10 u Jiu TTl iffUT 10 u ' ¦ " MM ktu JLH JUL JU jJLk Jl JSUI JUL JLSL JSUI JIM. J&JL jjLk JO JSUL LM-02A ro* W11OT5 I I TTT 5 U TIT 5 LI TTT 5 U ttr 10 u 10 u TTT 10 u TTTTT ID U 10 J 10 J 10 O 10 0 10 J 10 t 10 u 10 u 10 LI 10 J 10 u ToU LM& 6 u 10 u iy 'J MM JSl. JSL1L _MjJZA_ LM 02A 5 J ~5~J 3]l 5 U 5 U 5 J 10 U ~5! lot/ 10 V 10 u iC n to ll IC J J 10 u ~TT 10 u rn 10 u Ml) ID J J mL 5 U TTT X- sir JLa 1 C L 2jI Toy _iS-L TFIT I' ' Z2jl ZEZL ii 'j. HH T5LU ieh. r J — JUL 10 JJ jHT 3; j JUL jSJL 17a JUL JUi LM-f-CA jfrw m CgA LM-ffi* 5 J ¦Ki> >-!>¦ mr/zv&m TT 5 U TT 5 J TT 5 J TT 10 u -rr- io u TTT 10 u TTT 10 u ~iTT 10 u TTT io l; TTT 10 li TFT io u TTT IC u ToTT 10 J TTTT 10 Li TTT 10 J TTTT io u TTT 10 J TTT 10 LI TTT io a TTT io u TTT 10 J TTT jjwagis TfTw^iF — 5 I JiM TT TT TT TT io u 10 u ID U 10 tl 1 11 JfiJJL 10 II in j i B 10 JJUi 10 J 10 L» «; 1 IC u 10 LI TTT 10 I, TTT JJUt ii TTT JAiL i'1 J IB U 10 J "TuTT 10 U TTT io Li TTT — 'Jim -in jji _L^. ¦fi Ji. JUL _mu _Li^ jJUL —i-— —U— JiLiL M -n jjjl JJUi —^_1L iiJ_ —- M .i?A I (-1 w Ml' yi rjjin 5 B 5 U. TT Tj in ii ijj 'I i n uu n jj II UJ i ii II LU L), IJ LI 11 ll r " lil LI r .u 10 LI I i i TTTT] 10 D TTT ii; u 10 L 10 L a a H' LI ¦ LI J 1(1 D I.I--I _5JL _ Jl±L __ i :i f 9 3 IJ NA NA XI JU. JOJi III 11 JdflZA TT TT TT "\|j j MA 98 U TTT 1 3 TT" J 9 LI ~TT" SB J NA 9J U TTT i u TTTT TTT 92 J TTT1 ae ll 'j ? Ll 99 U JTTL _£JI i -JJi JlH n ii NA 10 U JjA_ _22L_ _MA_ I m M _NA_ 10 u JjJJi ¦i - ¦J U icy 10 u LHKA .mm. ¦j j 5 U 5 J 5 Ll 10 6 NA 10 U MA _037_ NA MA 10 J NA 10 U 10 U S 10 J io B IC J 10 J LM-33A JOJI - 1° 10 J TJaT- 13 J HT" 10 Ll "TTT 5 U Tw" 5 J Tg 10 u "iff 10 Ll Tar 10 U ~Ra io J T3T 10 Ll ~K£ 10 J Ua 10 U ^ j — 33EZ '¦y. -;- -M VIA MPWwM MA TU 5 J 5 U 21 3= s u TT 5 U Ll M 5 II TTT 1E[ ~ 10 u TTTT JJUL io y TTT 10 u JJUL 10 I TTT JIUL 0 u in >» JUL 10 J TTT jUl 10 u TTT M. J— 10 Ll TTT JUL JL= 10 J - I JUL IC J 11 zn; 10 J 13 U JUL. ~ 10 L TTiT 32 j33E 10 Ll TTT jEI 10 u TTT JUL 3ZZ N Ll TTT JUL 10 u TTTT JUL K D ToTT 32 IC u 10 u JUL TTT 10 u TTT jEl jjjj. jjlu. M-03A UMf ITiKft? 5 .1 5 U ~TT S U tct 5 U TT 10 tl 10 u ra j ID Ll TTT 10 Ll TTT 10 Ll m li io j TTT ic u TTT io u Trcr 10 t 10 I 10 Ll 10 ll TTT 10 Ll TTT 10 Ll 13 U 10 U ID Ll 10 u TTT 10 u TTT ¦u s u JILLL 1 JUL ' -mr JUL IBM JUi io u ¦^TT - . .. !l - 10 Ll _L1_L -UHt in u ¦m T5TCT 5 0 — s u 5 U Ttr 10 u 10 U 10 u J io j fi j io ul Tuft >0 u Ifl ' 10 L 10 LJ 10 li "nnr H3 U "W LM-0V> t) J bjJ 10 U 10 u TTl OJ VpJ n; u K> J ia j ToTT khj iij j j i .i 4# — ... J1L _LL2 J _Li_ ..: - J.:— JU JUL JUi JJJL JUL JIUL _UL jjiji. io J i^nr- TT 5 U -7 S Ll —- S Ll 10 u v: i 10 u TTT 10 u ri -i i • j i Ll TTT 10 Ll TT 10 Ll it: 1; 10 J 10 u — 10 J TT 10 L 10 J "J !-¦ 10 u TT IO Ll TT 10 J TT io u TT- 10 Ll "n-7 TT •tl u j-r jji _5Ji -LSI _Lil JfiAL JJJi. i JJL1L ID LJ '2 1' ¦a U JJUI 1 JXUi I > U ,'D U '2 y JBJi. ¦a l' JJUJ. m- 5 J — 5 J — 4t 5 Ll Ttr ¦n 10 u ~mr 10 J ~iTT 10 Ll Trrr 10 J Ttr 10 u TTT 10 Ll nnr io i tit 10 Ll TBTT io u "TTT 10 J -nnr * ¦M ¦M ¦ _L_ JJd. ig y j : JJUL JUL JU _u_ JUL J JUL Ji __ J L JUL _0JL JUL JJUL JJLL «- ¦m 10 u 10 u T j JOLJ 10 u 10 J 10 L tO J 10 U 10 Ll TTTT 10 Ul TTu 10 Ll TTu IC 11 TTTT ¦M -Li _Ui _UL _L=. _UL 10 L1 JUL _LLJ JUL JUL JUL JUL JUL JUL 10 'J JUL JUL JUL JUL JUL JUL JJLLL M-O'iA 5 Ll TT 5 U TIT S J TlT 10 u "TTT 10 Ll 10 Ll 10 Ll TT 10 Ll 10 Ll 10 Ll -nnr 10 D til u TTT I* AM. _i_L Ju. . JLk -J-A- JUL JL. -l: c ' 1 ¦ JUi JUL JLL JUL TlW i j TT 5 Li TTT b Ll TT 5 Ll Tr- io y TTT 10 v TTTT 10 U 10 u rrr I'J Ll TTT 10 J TTiT u j Tr- io j TT ic j TTT 1U J ¦nnr 10 L TT to j nnr 10 Ll l< ll HI J TTT Ttr 10 J 10 u IC U Ttr io u TTT 22. JlL _Ui JJi JUL. JUL JUL JUL JUL JUI JUL JUL JO. JUL JUL. JUL JM io j Jik rnw LMiflA 5 .1 TT 5 U TT 5 Ll TT 5 Ll TTT IB y TTT 10 u TTT io t 1W io u TTT nnr 10 u TTT ID .1 -nnr 10 J TTT 10 D TT 10 J TTT 10 u TT to J TTT 10 u TTT ra J TT 10 li TT 1C l TTT M Ll TT lo J [ tHMZIZZ I 4# -UL 5 U -Mf S J ¦m JJA NA 9.3 L 95 U J4£L. m jia. Ji£L_ NA ¦#1 J1A_ NA 9 5 Ll JifiL. -Kfr 5 U S5 U J-10 ------- Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) Clean ud Goal Bwni 5 Bhyl 700 Toluene 1000 Anth ceriftj(d/n Saizovalp 0.2 Seneoib) 2faftZD\|gAi 3 £eruro{\) Cafba£a.'e 5 Cfuysene 200 OtiNxrroteM Rjorant.'ie.' rifl»xHl ..3-od) fJaplii'iaieiia 1500 R>en Pyrene TTST™ 700 Cyatude 200 Wril IW 52 iX 1>K 1HCO IfflB 36 24 36 23 17 J 28 J 10 J 59 U V4C 3fl SB U 66 64 556 1 W 44 J Bar 4500 MM HA 1 1i'l?J199S 6M0 520 24 19 10 10 U 16 U io y 10 u 10 U 72 ID U 1Q 'J 12 47 10 u tdtiO 7 j 1000 140 m-03A WIQQOOD 9000 720 1700 1360 59 J 10 J 21 J 100 u 1 100 u 100 u 100 u 120 100 u 100 u 16 J 65 J 100 u 3900 81 J 10 J 1100 20 U MM&U raMHfflCl 4X» 4 Fj ' ^ " 640 1® U IPG U IDQ U 100 u 1M u 1® u IOC u 100 u ¦ i3£ ' 1 GO U ioqu 100 U 100 U 10a u 3100 ¦ mil 100 U 230 IMG MM-ttA w 1<X; 3M 240 410 12 10 U 10 U 10 u 10 L' 10 u 10 u 10 U S2 10 u 10 u 10 U 21 10 u 14 00 J 24 10 U 180 J 990 WIM-03A 9/0200* 7900 550 1700 1300 36 10 u 10 10 u 10 U 10 u 10 u 10 u 73 10 u 10 u 10 u 45 10 u 320C 62 10 U WOO 150 MM01A v.-: ' 370D 450 73D 11® 23 1 G ia u 10 u 10 u 10 u IB U 10 u 3S J 10 u 10 u io u 9 j 10 u 2COQJ 58 10 U m j 710 VIKWU 1ffl 1» 2» rjo S7 10 u n 10 u 10 li 10 J 10U 10 u ij 10 u 10 u 10 u 50 10 u HOG 66 10 u 000 10 U MM-03A 1160 191 72 249 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 36 J 10 u 10 u 10 u 19 10 u 840 J 23 J 10 u 180 J 4950 J MM-fliA 6"6®Ca 8310 W7 966 861 46 16 lb 10 u 10 u 10 u 10 u 10 u 82 -0 u 10 u 12 55 -¦a u 2000 73 10 u iOOO 49 ii IXC 120 000 1C 10 U 10 u 10 u 10 Li 10 u 10 u 10 U 10 u 10 U 10 10 LI •JOO "j 10 LI 66 icon ! MM-D3A 19S0 150 450 470 15 10 u 21 12 !: 10 u 10 u 10 u 55 10 10 LI 38 36 10 u 2200 il 29 440 1270 moA raoasxa 160 33 5 U 27 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 U 10 u 10 U 10 u 10 U 10 u 2000 U MM-ai «12r?Ytl £lT 5 1/ 29 1C U 10 u 19 U UJ u 10 u 10 u 10 u 10 u 14 10 u 10-J in u 11 ID LI 53 14 10 IJ 10 IJ 13 >0 J MM-D3A 1100 150 98 310 19 10 u 10 u 10 U 10 u 10 u 10 u 10 u 72 10 u 10 u 10 u 29 10 U 1400 29 10 u 120 200 U MM-03A 12-ir^X'J 6900 4iO 480 'JU 55 14 52 10 u 10 u 10 u 10 u 10 u 2b0 Ifil) 10U 18 85 10 u 78 ii- 1000 11)4 OU MM/IV. vww fiST 12 71 1f> u 10 u 10 11 1fl l» 10 LI 10 IJ 10 u 10 i) 10 u 10 ij 10 II 13 11 10 u Oft 13 10 u 16 74 iU V1M-03A yuaco* 180 5 U 5 U 36 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 L) 10 U 10 U 10 u 10 u 10 U 10 u 10 u 479 MM03A 1100 110 36 14* 10U 10 u IBTi 10 u 10 u 10 u 10 u 10 u ' 57 ibu 10U \h 10 U 10 u 370 11 11 77 2CC00 U UM-33A W?Q& 7 5 U 5 U 5 U 5 U 5 J s 10 11 5 5 U 7 5 U 15 5 U 6 * u 5 U 1? 5 U 1000 MM-03A ?1WW 220 17 5 U 11 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 U 10 u 10 U 10 u 10 u 10700 MWAU ¦ 380 15 & U 53 TfTd i5U \b b 16 u 10 u ifi u 10 u 10 u 10 u 10 u ifiu- ia u 1$ u iffil ifl ii 10 u 1CHJ 1u 14JU V1M-03A 3EKKB7 40 50 U SOU SOU 10 u 12 10 u 10 u 10 u 10 u 10 u 10 u 38 10 u 10 u 10 u 13 10 u 190 J 10 u 10 u 45 4190 MM-D3A ISVOtSP 3600 290 240 570 20 10 u 14 10 u 10 u 10 u 10 u 10 u 110 10 u 10 u 13 47 10 u 1700 27 10 u 390 1000Q U mm rr-r:- J 20 23 in 15 UJ i5iil in 530 ior>n 1190 22 J 11J 18 J 10 UJ 1; j 19 J 10 UJ 10 UJ M J 14 J 10 UJ 4H J «o ; 10 Lk 3200 22 J 35 J 44f» 1880 ! MM-03A WS/201A 62 5 U 5 u 5 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 U 10 U 305 MM-353A WBMtt HI 18 9 (J 13 16 rr IB U ^ 15 U 10 u io U io y ID U io U i b li 10 u 16 U irtr ~rau~ u 24 ? 10 u iouJ 10 cr 5100 anseoie 5 U 30 5U 11 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u in u 10 u 10 U 10 u 10 U 10 u 300 U MM-D3A HfMQBic 3440 696 420 1300 ii j 10 u 10 u 10 u 10 u 10 u 10 u 10 u 39.1 J 10 u 10 u 16 J 119 j 10 u 3190 J 14 6 J 13 J 369 J 1600 MM-UJA I'Si'Xll) 334 22 s u 50 10U 10 u 10 u 10 u 10 u 10 u IQ u 10 U 10 U 10 u 10U 10 U 10 u 10 u 153 10 U 10 U 62 1200 <> 16 5U 20 10 u 10 u 10 u 10 u 10 u 10 IJ 10 u 10 u 10 U 10 u 10 u >0 U 10 U JQ U 14 10 u 10 U 10 u im MM-03A «arois 4270 872 838 1710 34 9 J NA 15.6 J NA 156 N NA NA 104 11 5 J NA 41 J 48 8 J NA 6130 71.1 31 J 699 5700 MM Oil ~naoaa: 180 18.6 5 U 31 B 97 U NA 9 ? u NA 88 Nb NA NA 4.9 U 9 7 U NA 10.3 97 U NA 71 5 5 u 10 5 41.9 5100 VJrKp 177 502 122 47 ^ V3U NA N* 42 NA W NA 5 94 u NA 98 U 6S U NA 25^ 90 Qfi \) 175 1200 MM-03A 1080 265 89 9 485 10 3 NA 10 u NA 17 NA NA NA 382 10 u NA 10 U 10 U NA 991 10 U 10 LI ?;7.9 5100 mmwba Kaesa 139 4? ? 14 66.6 9./ U NA 9 / U NA 1 ? NA NA NA 49 U 9.7 U NA 9 7 U 9 r u NA 9 7 U 9? U 9 / U S? U 3100 MRW-01 MvXGG 30C 65 24 75 46 6 J 5 J 10 U 0 u 10 U 10 U 10 U 36 10 u 10 U 5 J 31 10 U 530 31 3 J 32 20 MRW-01 law-Msu 220 38 10 U 1 j 45 12 U 10 u 10 U 10 u 10 u 10 U 10 u 10 U 10 u 10 U 10 U 42 10 LI 1? id 10 U 10 U 10 u ; MRW-01 mothoi 220 98 5 U 1? 47 10 U 10 u 10 U 10 u 10 u 10 U 10 u 10 If 10 J 10 U 10 II 35 10 U 28 30 10 IJ 10 U 10 u MRW-01 wsce 1D50 92 26 7' 93 13 10 u 10 U 10 u 10 u 10 U 10 u 150 10 u 10 u 10 U 68 10 U 940 69 10 u 10 U 37 MfMO- rnvvm u i?0 "44 1M 10 U 15 [> u ^1 Hi U aLj f6 u 10 0 2W U MR.-,'-01 SMlOOtB 7 f>n 98 29 130 iod 10 u 13 10 u 10 u 10 J 10 u 10 u 120 10 u 10 LI 10 U 62 10 u 770 72 10 u 68 200 UJ MRW-01 vnraea 1500 210 13 430 150 10 U 16 10 u 10 u 10 u 10 u 10 u 240 10 u 10 u 11 100 10 u 3600 110 10 u 200 200 U MRW 01 BKaxm 260 33 5 l) fi2 "S ia u 13 U 19 U 1 c u 10 u 10 u 10 u OS 10 u 10 IT 10U 23 to u 10 u 10 10 LI ' 200 U MftW-fr i'-ifMa WJJ 44 » U bl~ 51 10 u 10 u 10 u 10U io u 10 u 10 LI n 10 U 10 u 10 U 49 10 u «lG jy 10 u If mu MRW-01 »®2C6» 860 140 10 217 130 10 u 13 10 u 10 u 10 u 10 u 10 u 240 10 u 10 u 12 81 10 u 2500 84 10 u 92 200 u MRW-01 wijoom 100C 1 JO 9 U 21/ 65 J 10 u 10 U 10 u 10 u 10 u 10 u 10 u 30 J 10 u 10 u 10 u #0 J 10 u 1300 46 J 10 u 43 2!W U MRW-01 rvYft* »SJ * ? V 7^ $ 10 y If $ 1U u \F 10 u 10 l^l 10 U 42 10 LI V 10 y 10 y 10 u ! 10 y ioy 10 v 12 m u \| MRW-01 3dffi 460 89 14o 293 71 J 10 u 10 u 10 u 10 u 10 u 10 u 10 u 120 J _ 10 u 10 u 10 u 44 J 10 u ; 1500 J 10 u 10 u 10 U 200 u MRW-01 M09» etc 120 5 u 153 1QC U 100 u lMU 100 u 1C€ U 100U 1M5 U 1 DO U 100 U 100 u 100 u 100 u 100 u 100 U 10O0 ItiOU 100 u 1 Gil u axi u MRW-01 110O 220 J 5U 219 J 75 J 5 LI ? J 5 U 5 U 50 5 U 5 LI 87 J 5 LI 5 !J 7 J 48 2 5 U 6400 55 J 5 Ij 0 J 200 u MRW-01 ia>T5005 290 34 5 U 40 47 10 u 10 u io u 10 u 10 u 10 u 10 u 67 10 u 10 u 10 u 33 10 u 34 26 10 u 10 u 200 u MRW-01 S13KM 4 CO 30 5 U 51 54 10 u 10U 1GU 1C u 10 u 10 u 10 u 110 10 u 10 u 10 u 32 10 u 440 J 22 10 u 10 u 200 U i VIRW-01 (TOMM 510 50 U ^ U 74 J 55 10 u 10 u 10 LI 10 li 10 u 10 u 10 u 110 10 LI 10 u 10 u U . 10 II 770 J 10 10 IJ 10 u 300 U MRW-01 5 'J, 5 U 5 U 5 UJ 140 E 10 u 14 1U LI 10 u 10 u 10 u 10 u 130 E 10 u 10 u 10 u 90 10 u 4300 87 10 U 10 u 200 U MRW-01 380 33 ? u 44 66 10 IJ 10 u id u 10 u 10 'J 10 u \'J u 105 J •0 u id u TO } -0 u 200 * 53 10 u 10 Ij 200 U MRW-01 31703007 ??r. 16 F 1 f 37 J IV, J 10 u 10 u 10 u 10 u ioi; 10 u 10 u 71 in u 10 il in u 45 in 11 10 u 73 J 10 IJ in u TOO 11 MRW-01 . I&zwpi ib 6 5 U 10 22 J 10 u 10 u 10 u 10 u 10 u 10 u 10 u 22 J 10 u 10 u 10 u 10 U 10 u 21 10 U 10 u 10 u 200 U MRvi-^l Mivxe 300 7 S U W ib u 10U 10 u 10 u «6 u 10 u 16 u (0 U 16 u 10 u 10 u 55 10 u 10 U 10 u 10 u 200 U MHW-0? R'10?X9 fifC 51 57 10 U 10 u 10 u ID U 10 u 10 u 1Q U 10 u ia u 10 u 10 u 10 u 10 U IP u 10 u in u 10 u 10 u ^>.1 u MRW-01 iWO'O 370 13 5 U 63 74 10 u 10 u 10 u 10 u 10 u 10 u 10 u 30 10 u 10 u 10 u 43 10 u 920 44 10 u 10 u 200 U MRW-01 300 24 5 ii 50 110 nTu7 11 J 10 LU 10 UJ 10 UJ 10 UJ 10 UJ 25 J 10 UJ iBuj M li. 61 i5 UJ 710 66 10 u 10 LU 200 U MFTW-Q? aracHit m « 5U 98 23C- . 10 UJ 22 J 10 Ui 10 LAJ _ 10 OJ 10 UJ 10 UJ 100 JO U: 10 UJ 14 13D 10 UJ 31 CO 160 10 4 in u. m ui MRW-01 5.7317017 420 45 5 U 30 110 10 u 13 10 u 10 u 10 u 10 u 10 u 43 10 u 10 u 10 72 10 u : 330 63 10 LI 10 u 200 u WFta'-iVi 130 14 ftu SO 1 ^ u 10 U 10 u 10 u 10 u 1C u 10 u 74 10 u IQ U 10 u 58 in u w 45 10 u 10 u 200 U ^RW-01 . H3ZB0H . m . 5 y, 5 U . 31 n 10 t 10 U 1UJJ IQ_U _ 10 J. 10 u 10 u. 10 U 10 u_ 1.0 u ia.u _ 2.7 10 u 10 u 10 U- 1Q-U -10 u _ _ 200 U MRW-01 KW314 820 r~ 98 5 U 112 190 11 u 17 11 u 11 u 11 u 11 u 11 u 120 11 u 11 u 14 100 11 u 1000 120 11 u 110 200 U taflW-di wwwis 574 32 5 U 59 10 u 14 10 u 10 ii 10 u id u 10 u 78 6 U 10 u 10 u 10 u 99 in u 810 W 15 U 10 U 200 U V1RW-01 SHOEM 291 ft 3 U s 119 10 Li _ 10 U 10 u 10 u 10 u 10 u 10 u 25 10 u 10 u ia u M 10 u 11 9 30 10 u 10 u 200 U MRW-01 T2fMiH51!i 263 5 U 5 U 27 200 10 u 13 10 u 10 u 10 u 10 u 10 u 16 3 U 10 u 10 U 10 u 73.9 10 u 220 70 3 10 u 10 u 200 U KSOTIT til 1 47 5 13 73 321 ill! U 24 10 u 10 u 10 CJ iiru ib u 792 in u IflU 17 "_TC5 . mu 76E 1 }\ 11 10 U 45 MRW-01 ¦rwrao™ ZiS B * u 185 10 u 13 10 U 10 u 10 u 10 u 10 u B2 U 10 u 10 u 12 879 10 u 218 684 10 u 10 u 200 U MRW-01 092019 168 5 U 5 U 79 108 NA 10 u NA 0 2 U NA NA NA 21 2 10 u NA 10 53 6 NA 10 U 16 5 10 u 10 u 66 MKW C " WSOBD Tfl " 5 U g'O 329 NA 991) NA U 2 U w NA NA 20.3 99 U NA 99 U 54.5 NA 182 » 99 U 99 u 45 MRW-01 5 U. 5 IA 28 5 101 0 NA 11- NA 01 u NA NA NA 5£2 9.9 U NA 108 687 NA 21K h 7 99 U 99 u 42 MRW-01 4,'iicas! 220 5 U 5 U 169 385 NA 98 U NA 0.2 U NA NA NA 68 98 U NA 9.8 U 9.8 U NA 9.8 U 98 U 9 8 U 98 U 57 MFWO! 1040023 //. 3 5 U. 5 LA 22.5 J 193 0 NA 168 NA 02 U NA NA NA 37 4 99 U NA I3.y 90.6 NA 390 yj b y 9 u 99 U 50 J-ll ------- Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) TiTTT 700 ^oIueruT 1000 A.n!h Cer, a2 i>eiTx3Vb) SSao^i SSSoffJ s 1 Chysene 200 Fi/orant.'M». Jr. cm cv" 0~^efT 1500 ?Vm TOO 200 > Goal I'yrene ,W1 Kirw & Trcssflr TU TlT "RS" "TOT" _ulll NA TE" ~R5~ NA T«" NA -wr NA "FTT W ur NA JJLU HRWC5 fl » JJLU JiLU JiLU. -Ui-iJ- J2JJ. _UUL M i! JUL JJLU ji. a JUL '¦3 U '3 U n.u. JiLU J£_U JUIL (tRW-02 I jtmn 5 U T 5 U TIT 5 U TTJ 5 U "FT 10 u t 10 u tt 10 u TTO 10 li ~nnr 10 U 10 U 10 u tt 10 LI 10 U ~nm 10 u 10 u 10 u 10 u 10 u TT 10 u unr 10 D 10 U ^Rw-ca 1C u TdlT 1C u Ifl u 10 LI you 13 U 10 u 10 J m u loU JL± JJJi 2jt _Ui JILL Ji^i JiLU. 10 L> JiLU. -UMl _ulll "J u JiLU. JUJ. JiLU. JiLU JiLU. J&AL JJLU JiLU JiLU. -i-U MRW-02 MKw'CC! 1212.12001 TT 5 U 5 U Tu TiJ 5 U 22 i J tt 10 U 10 u io u 10 u 10 u TT io u TT 10 u 10 u 10 Ll io g TT 10 B TiTT io u io u 10 U ToT 10 0 TT io u TTT to u 10 J 10 u 1D U n j in u is u io u "ToT io u 20 U _LU _LU _LU JL. jlu JiLU JiLU. JJ-U. JX-w JiLU, JLU JLX JUL JiLU. JiLU JJLU JiLU JiLU. JiLU JiLU JJLU say 20 Q. TT ¦^¦11X2 5 U 5 U 5 U s u 5 U 5 U TiT 22 10 U 10 u HI J 10 u TUT 10 LI 10 u TT 10 LI ' 10 (J TT 5 J 10 u Tut io u 10 LI -J u. 10 u ~~~T 10 LI •J 'J. io u TT" 10 U ttt 10 LI TTi 10 u Tu] KHw'Ci' 5 U 10 UJ 10 uu 10 u m- -s# -2JU 4# ¦U ¦m JAM- 10 u •m jiu 10 u -n JM 10 J —LS—Lai, 10 J m * JiUt 10 u ¦M W JJUL 10 LI -m •m KIM S J L» ' j. LJ lli U n: u in J 1'.' u 10 u 1 J LI jS U ~RTIj S LI >• 10 L J 10 u J 10 J • ' 10 J 0 D 10 LI 10 0 m ffiv-w -Hi. — -Ill _5JL 18 10 » in ii in ii -ULLL ic J in i.i 10 II in ii -ULLL i' - . JJLU. in u _ULU io u hi ii 10 IJ JJLLL MKW-02 5 LI Tu 5 U TiT 5 U — 5 U TTT 24 10 U 10 L 10 LI 10 J 10 LI m u 10 J io u 10 u ID U 1Q U 10 u 10 u imr 10 LI TIT ~nnr TTiT TiT 1 K L 10 U io u 10 u lOTT 10 u 10 u MRw-fiC Jul _Lii _ Jiii 10 tl _!iui n: J 10 u 10 u i a Hi II 10 II 10 u io u I'l II id MRW-02 5 U Tu 5 U 5 U 5 U Tu 5 u Tu 17 ~TT 10 li 10 u 10 u 1u 10 u unr 1.0 u 10 LJ 10 I) -finr 10 LI 10 LI 10 LI utr 10 u 10 LI 10 J 10 LI 10 u -unr 10 J i a u io u "iytr 10 u "TTO" TT -rotr 10 LI UJ J 10 LI 10 U VIRW-U2 1_ _5JI __ ^_u _3CJ_ 10 L 10 U ;! 1 10 0 10 -J 10 LI 10 u 10 It io y io u J_ '-3 0 io y 10 _KMJ 10 U MRW-02 7 TIT 5 U Tu 5 U 23 ZZ 24 ~mr 1 ll u TTC i ii j 5 y 5 U T? 5 U -nnr S J io u 10 y TtT s u unr jTu -ifu s u "TW 10 u 5 U TTtT 5 y TTu ToTT MRW-02 _5Ji _5Ji _LU JlJ. 19 10 L 10 U iai> JOJi IC LI 10 u 10 u 111 LI 10 L JM _LUi 80 LI '¦a u io y JiLU MRW-02 5 U 5 Ii 5 U TTf s u II 5 U TiT 10 ~W 10 u "TTu" 10 u TTu 10 LJ io y 10 u io y TlfTf io y o j io y 10 y TTiT 10 U -r-T io u TTTT 10 1L rrr io y TTu io y TT 10 LI 10 ll 10 LJ TTiT io y 10 Ll l0 li 10 •; 10 ll MRW-02 aaaa JLU , 5 U _ 5 U J5_ J2J, jai 10 u ia u in u JLiL o u jot. JJLU 10 u JM u 10 u _1('U -m. 5 y 5 y TT 5 y TTT 5 y zz JL 10 u TTTT 10 u "RTT "TTT W 10 y TFT io y ~nnr io y TTTT io y unr 10 y TTTT io u EZ io y TTTT io y TTIT TTTT TTTT TTjT 10 L' 10 U -mr n u HRW-n?. a-n.SKS JJi 10 -t- 1 : ¦¦ J^ ' '¦ 10 : "J 10 U aa 10 U JiLU 13 U JUL J1A 13 U MRW-02 BREST B'1Q.?X!1 worn 5 y 27 TT 10 ll -nnr "M TTT -IC. LL. -nnr 10 y TT? -nnr 10 y TTIT TTtT io y TTTT -jinr io y n TTTT -TTTT JiLU rerr J2JL irtr 10 y "TTT 511 JlU -J3LLL JJLU tftRW-n? jji JLU JiJl JL. 10 u JiLL JO. JiLU i° u 10 U JJLU. -1S-U- JLU jfijL JILU MRW-02 I fctaw-0i 5 y TT7 5 y TTT 5 y TU 5 y TIT 26 TT 10 u TTTT 10 li "nnr io y ToTT io y Tir 10 u IO io y "mr io y TTT io u ttit io y "mr io u T5TT 14 10 y HTu to y "iTiT io y io y BEE MRW-02 'MFi'.-K JUL 5 u TTT JLX. 5 y TTT -1U. 5 y —r JJL 16 JL TiT 12 JJLU "1T 10 u JiLU "nnr 10 u 1fl U TTT io y JiLU. TTCT io y "foTT JiLU 10 y JiLU ~io"IT io y JiLU ~nnr 10 u "W JUL 10 J "W JiLU io y "nnr JiLU. 10 u JiLU JiLU "T5TT "nnr io y TTiT JiLU io y "TTiT JiLU. io u TTTT JJL io y J2JL "ToTT "TTiT io y JiLU 10 y "TTiT MT-rw-m J-U -LU -LU JL. JiLU JJLL ¦» ¦» iB HW HW JJLU. ¦Iff JL HW ¦## MRW-02 5 U 5 U 5 U 5 Ll 5 U 1- J 10 — 3Z 26 IC U 10 U 1 10 L 10 u J J_ JJLLL io j 10 io y JiLiL 10 J ii ia y 10 u "TiTTT 14 ia u 1 Ll J 1 'J J JiiL 23 10 J _LU 10 Ll MRW-02 3^ 10 u 1? 10 y 10 J 10 11 io u ip u io u JULLL ID U 10 U 10 U joal jjjj. MRW-02 5 U 5 U 6 U 5 U TTT 10 u TT 10 u 10 u 10 u 10 u 10 u 9 S U MRW02 5 J 5 U NA 98 U NA 0 2 Ll NA NA 49 U 9 8 U NA 98 U NA 11 9 9 S U 9.8 U MRW-0? 4# % 12 U NA 12 U 9 7 U NA fV4_U NA "TO" NA ir NA ¦P NA ^4; JiLU 13 U MRW-02 5 u 5 y TTT 14 9 "NA" ia u ur 019 u "Fir "NA" u li "na" m j 9 7 U "TTTT 9 7 y Mi-;,- -, NA NA in y NA 10 Ll MRVi-Ol _L_ ^JU. 1-4 NA Q 7 1J NA n 19 i' NA NA NA 4 1U q 7 li NA 0 7 II 97 ll NA " ¦>7 f S7U 97 l» - ¦- TiT TTT zz IT "ST "TT "TTT TTiT -TTTT TTiT "W — TTT TT MW-07 miifl op 7 _Ui _i11 11" 3 -I 10 'I ;' 10 ¦' IP 10 IJ 10 u _£J. _74J1_ 10 u 4 J 10 IJ MW-07 12»1998 s y 5 y 5 y 5 y 120 10 ll 10 U 2 u 0 u 2 y 2 y 2 y 4 8 u io y o u 20 y 58 y 2 u 9 6 u 10 u WW-f7AB wivzaxt _5_U _ __ _U. 10 u n u io .¦ 1C u 1 J 10 Ll 1' - _Li 3 80 '.I JJ. ^J. JJ. n i. MW07AR 5 y j 5 y TTT 5 y TiT 5 y Ty io u TTiT 10 u TTu" 10 ll TTu 10 y 10 y TTT io y TTT 10 y TFiT io y TTT io y TT io y -r io u io u io y TT 10 y TTTT 10 y TTT io y TTiT to y ^T io y TT io y TTT ~6'U t L Tu jUl VIJL JSUL 1D U Hf# 1? JiLU. is JJUL « W tH- ID UJ MW-07AR WW ¦17.W-: "JTiiw liyiaaMi s y j y 5 y 5 y s y 5 0 5 y TiT 10 (J T~ 10 u io y 10 j ic Ll TT n li JiLU, 1 L J 13 Ll 10 y 10 u rj j io y iu y u j 13 J 1'i J ¦ J JM TT Hjl zz 3Z zz zz io u JiUL 10 u J^ JiLU. j J JiUL zz JiLU JiLU ZZi MW-C<7AFI_ JJLU, JOJ. JiLU JiLU, JJLU V1W07AR mw 575? T55BT 5 y TT s y Ll 5 J Ll 5 y TT 10 u 10 ll io u 10 ll 10 u 10 u 10 Ll o y TiT 10 J 10 y io u :< j 10 Ll 10 u 10 y TuB io y io y 10 y i ¦ i io 10 y _ j id u io J TT if; io y io y TT 10 Ll id .' 10 u 11} Ll ic- y _£JI ¦U jjj± JJLLL io y JJLLL JJLU 10 y JJLLL 10 y JJLLL 10 y ifr ia y JJLU 10 u ULU JJLU io y Tj JJLLL Sit ^IW07AFI mw-v,1.'--; s y 5 y TT TT 1C u io y io u TTT TiT io y j io u ic y 'i li y m y io y in y io y TT 10 Ll TTT 10 J TT 10 J i j y u y s y oTT "iu u 'TT MWJffAR _ _5JL _U _SJI _5JL 1l, " 1Q JiLU 10 U JiiL JJLU i? u JJLLL JJLLL JJLLL JJLU. JJLU ' M '' ' 10 IJ i'; MW07AR htoti-jA* 5 y TT 5 y TT 5 y "TTT 5 y TT 10 u t; 'j 10 ll TTT 10 u 1' ' 10 u •o u io y 10 Ll TT io y TT io y 'Ll Ll 10 Ll •U u 10 y TT io y 1 io y TT io y TT io y •3 u io y TTT 10 y TT 10 Ll TT io _y TT MW-07 AR _5JL _ _5JL -Li! 1' 10 u J^ JJi "HI j2JI ¦i 10 H Ifl" JiLU 10 -.t JUL in ii '¦1' 1 i" n JSJi JJLU WW07AR 42 T s y 5 y s y ~j 9 TT 10 u 10 y Tu 10 u TTu io y ¦ j io u io y io y io y 10 y IJ Ll io y To y io y io u 10 y io y 10 u io u id y io y io y io y io y io y io y io y io y ToT io i io y ¦SEKiOT i i ii — vFUf'A'ua s y 5 y _LU 5 y TT _5U 5 y Tu j_o '' 10 u TT JJJJ. 10 u __ 10 u TTu 'J io y -nnr io y "T Ji_L 10 <¦' 10 u ' 10 u IJ ia u id u io y TTu 10 u TTTT 10 y Tnr io y 12 U 10 y TTTT 10 u TTT io y 12 J io y Tu io y TTiT io u io y Tu io y TTIT if-/: V ag3M14 5 U 5 U •i U 5 U 10 L ' ¦ Jj_ ' JJLU. J2JL in u 10 L JiJi JilJi u " Hi i- JM 10 u io y Etr in u MW-07 AR 5 U TT 5 y TT 5 y TTT 5 U TT io u 10 u 10 u TTTT io u io y TTu" 10 y io y io y 10 u TTTT io y ToTT io y io y -nnr 10 u TTT io y TT 10 y TTu io y rrr io y TTTT 10 u 10 y io u TTT io y io u TT TT io u amaa JUL _UU JLU JiU jo_l JiLU my Mil. ju^l JJLU JiiL 1.Q..U JfiJL J2JL m u JiJi JILU. :? m JJLU. JiLU JiLU MW-07AR l1W-07ftR a!jB?017 5 y TT 5 y sT 5 U TT 5 y Ty 10 U TTiT io u tstt 10 u TTu 10 u TTTlT 10 u ToTT 10 y Tu io y TTiT io u TTu io u ToTT io u TTT 10 u TTT io y TT io u TFy io y TTTT io u TTT io y Tu 10 u TTT io u TTu W'i)/AR _£1 JJi. -93-U JiA_ JiM -MM jja_ JIM S.3-U J«_ 'i3.U 99-" -33 U -aa.u -3-9-U -S.3JJ JJJ. J-12 ------- Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) J-13 ------- Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program) TOO Toluene 1000 XyteniB ce 0.2 uJ 10 u W 10 u 10 u i D D 10 u 10 u 10 u 10 J 10 u 10 u 17 TTT 10 u To u 810 29 ID U 10 U 10 U 10 U Tg~lT 87 13b aim ¦± 10 70 IC u 10 u 10 u 10 u 1 & tj K 10 u 10 u 10 tj 10 LI 10 l' 10 u 10 u ID U JUiL J±iL JUL jjai JJ2. WZ02AR hz mm wii-aota 680 IK) 23 ~5" 91 10 10 u 10 u 10 u 10 u 10 J 10 u 10 u 10 u 10 u ¦IJ L" 10 u -J Lt 10 u 10 J 10 Lt 10 u 10 U 15 u 10 u 10 u nm 10 u 10 LI 10 u HT 200 U 150 12 10 Li 10 u 10 u 10 u IC ; 10 u 10 u 10 L) 10 u 10 u 200 UU -8 64 - 24 ¦M TTu ULiL lii JUi 10 LI jaji ¦## j_ 10 U LLLL ¦tftf JJLLL joji. 10 u ¦m ¦frf Ji WZ t 44 ~w 10 U 10 u 10 u 1L> U To u II." u TTu W&Q4 26 5 U 21 ft 1U U 10 u 10 u 10 u 10 U 1U u 10 U 10 u i¥U 10 u Tii u i0 U l-'J LI 10 U 200 U UZ-GlAft Ji. .Ui _5_LI AJl JJLLL J 10 u 10 " JJLLL _L JJLLL 10 " JUii J^vl JSU1 JJLLL JJLLL 10 U JJLLL JfiJi JJLLL JSSL mcam v7iy 220 5 U 5 U 5 Ti 23 tir 12 10 U "TU 10 u TTT 10 u 5 LI 10 u 10 u 10 U 10 u 10 u 10 u TT 10 u "TTr 10 5 10 LI 10 u Tir 10 LI TTT 10 u 5 U 10 u F LI 10 u 293 J b U 5 U 5 U 5 U 5 LI 5U 5 U 5 LI 200 LI 71 JlIL JJLLL 10 u JOJI inn 10 u JDU. ir. u 10 n 10 U 10 u 1fl II m ii 10 u JUL JOJI JLii 10 lr JLL MZ02AR M——~ 76 5 U 50 U 5 U 50 U 50 U 10 L 56 J 10 U 10 u 10 u 10 LI 10 u 10 u 10 LI 10 u 10 U 10 u 10 u 1 ! LI 10 u 10 u TTHj 10 LI 10 u 10 U 10 U 10 LI 10 u 10 u 10 u 200 J 41K) 10 U ITTU 1U LI TOU 10 u 10U irju 10 jTiiJ 10 U 10U 200 U M7-C-2AP _2Q_ _ _ _ 10 t 10 L 10 u in" 10 u 10 i )¦: li 10 u io y 10 LI 10 u JCMJ JJJJ 10 u jom_ 10 LI JO_J JOJi JWJ1 MZ-02AR r 23 5 U TT" 5 u TIT 5 U 10 u TT" 10_.LI m u 10 LI 10 u 10 u 10 u 10 y 10 u 10 u 10 u 10 u 10 u 10 LI 10 U TTTT 10 u TTu 10 1/ TTU 10 u nnr 10 u — 10 u 10 u Tvr 10 u 574 AW 63 10 U 10 u 10 u 10 LI 10 U lOU 10 U 268 _L_ __ 66 _2fl. IE 10 L 10 U 1G U 10 U 10 J m J 10 J 10 U iO J 10 L 10 u 10 LI iO J 11 10 Li 10 10 U ?0Ci U I 02 AR 64 TT 5 U 5 U TIT 5 U 13 — 10 LI TTu" 10 u TTu 10 u 10 u 10 u I LI " 10 u 10 u TTTT 10 U 10 J 10 u 10 u "nru 10 u ~nrr 10 u iTu 10 u TIT 10 U TTTT 13 r 10 u 10 u ¦wu 10 u TTu 200 U MQ ll 1QT7 ToTT 10 l.i 14 5 L» 5U J0L_ JOL. jo_i 10 u 10 u J2JJ JJLU. JOJi JOJL JUL 10 t J2JL in u J0_J. u JOJJ. 10 u JOJi ^u MZ 02AR i&mr S'1517013 ¦it'/cU'l -'_z_ 160 HI 19 5 U 11 10 U J00_ A_, r y 17 JLc. JZ. 10 u T 10 LI 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 LI 10 u 10 u 10 u 10 u .lUBBIjX'J 10 u 10 UJ Kf UU icnj 10 LU. m lu ignis 10 UJ inn Kru an uji TTT JOL, JJLL JOJi JiLLL JJJ_ JL^. 1-C-U w_v 10_Lf. 13 u jn_g jml jaji JUL J2JL JOJi loil Jill JO U T 200 U li.'Hl'J JOJi J2LLL MZ02AR 5/2 TTT 15 TT 6 TIT 5 U TTT 5 U TTT 5 U TTT 10 L) 10 U TTT 10 u "TTT 10 u 10 u 10 u "nnr 10 LI 10 LI "TTTT 10 U T5TT 10 u nro- 10 u TTTT 10 u 10 u 10 u 10 LI TTTT 10 u 10 u 10 u 10 U 10 u 200 U 200 U 10 L 10 li 10 u jutt iq TT in ti K' D mTTT aeaafl ,.I3f33R&IC- a it _L_ JLU JUL JM, JLk J5JL J2J_ JL^ JJLk J2JL 10 u JUL JUL jim JJLLL JUL JUL JUL JUL JUL MZ-Q2AR mTo^TT I yzanun 6 f&4 IT 5 U 13 TT 10 u To 10 u TBTT 10 U ToU 10 LI TTu" 10 u TTTT 10 LI JO u 10 u TTTT 10 u T5TT 10 LI "WTT 10 u ToTT 10 u ToTT 10 LI TTtT 10 u 10 U 10 u loTT 10 u TBTT 10 LI TBTJ 10 u T0TT 10 u T3TT 200 u 1? TU 200 J ¦v MZ-G26fl b U VIKSOiD inmrt 313 33 JUL 5 U 5 U TU JUL 46 JUJL. 5 U 9 7 U TTU" JsL NA 9.7 U 9 .• U NA JLLLL 02 J JiL. HA 22- NA Jia- NA JJUL. NA 49 U Ll 9.7 U JiSu NA JUL 97 U TTu ilU 97 U TTTT NA JUL 97 Ll TTT JJiJL 9.7 U TTTT jiji 87 J TTu M 87 Ll TTTT JSSL 84 TP" IAZ-02Afi 5 U NA NA 019 U NA NA 49 U 9.7 U NA NA MZ-024F MZ-02ifi 4tt — 5U TU U U * NA NA NA NA NA 19U NA NA NA AUL. 49 U TTU #¦ -w JLUL TTu NA NA 9 B U 9 Tu jL«k 9 7 Ll Hotas: At results are in ugL U - [ndica?BS that the constituent was not detected at the reported detection timl J - Indicates an estimated value. The constituent was posjtwEfy identified. However, the restrtt was less than the ------- Table J-6: Summary of Historical Shallow Groundwater Quality Data (other wells with historical data for current parameters) Cleanup Goal nervene s EtiNyl 700 Totieri! 1000 a yen es Acenophlhenn A^enopMhyten* An! ft oerwot)£ 8en«H«jp 02 6'en/o{o) Beruo^g JviJ nen/o^) Carbon e b Chrysene Mb Often zyihj Ruorenthene Fluorene lndeno(lZ3^rf) Napntholun \bOO ryfene ^4-uim 700 Cyanide Mall Dole .AM-OS A wan 994 10 u 10 U w u 10 U 10 U 10 u 10 u 10 u 10 u 10 U 10 u 10 U 10 u 10 U 10 u 10 u 10 u TO U 10 u 10 u 10 u 10 U 10 u AM-OSA 01/t»7 2 J 2 J 5 U 5 U 10 u 10 U 10 U 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u NA NA AM-OSA 9,^1997 5 U 5 U 5 U 5 U 10 u 10 U 10 U to u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u NA NA AM-OSA mymt 5 U 5 U 5 U 5 U 10 u 10 u 10 U 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u NA NA AM-05A 2W19SS 5 U 5 U 5 U 5 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 1" •• 10 u 10 u NA NA AM-OSA &H/1936 5 U 5 U 5 U 5 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA NA AM-OSA S U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA NA AM-05A laraim 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 u 5 U 5 U 5 U 5 u NA 5 U 5 u 5 U 5 u 5 U 5U 5 U 5 U NA NA AM-G5A unarm 5 U S U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U s u S u 5 U 5 U 5 U 20 5 U 5 U 5 U 10 U AM 05A 3/91959 5 U 5 U 5 U 5 U 10 u 10 U 10 U 10 u 10 U 10 U 10 U 10 U 10 U 10 u 10 u 10 U 10 U 10 U 10 U 10 u 10 u 10 U NA AM 05A 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U S u 5 U ! 5 U 5 U 5 U 5 U NA NA AMOSA 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5 U s u 5 U 5 U 5 U 5 U 5 U NA NA AM-05A 7,'tCWOOO 5 U 5 U 5 U 5 U to U 10 U 10 U 10 U 02 U 10 U 10 U 10 U 10 U 10 U 10 U 10 u 10 U 10 U 10 U 10 U 10 u 10 U 20 U AM-OSA lirtiraoo 5 U 5 U 5 U 5 U 10 U 10 U 10 U TO U 10 U 10 U 10 U 10 U TO U 10 u 10 U 10 u 10 U 10 U 10 U 10 U 1Q U 10 u 60 AM OSA few 5 U 5 U 5 U 5 U 10 U 10 u 10 U 10 U 10 U 10 u TO U 10 U 10 U 10 u 10 U 10 u 10 u 10 U 10 U 10 U 10 u 10 u 10 U AM-OSA S U 5 U S U 5 U 10 U 10 u 10 U 10 U 10 U 10 u 10 u 10 u 10 U 10 u TO U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 U AM-OSA itwatin 5 U 5 U 5 U 5 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 U 10 U 10 u 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U AM-OSA !2®2001 5 UJ 5 U. S UJ 5 UJ 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 u 10 u 10 u 58 10 u 10 u ID U 10 UJ AM-OSA VV.-Otc 5 U S U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u NA 20 U AM-OSA artsroyc i 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 0 2 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U AM-OSA JACOW 5 U S U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 U 5 UR 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 UJ AM-OSA V3.C0K 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 2 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u to u 10 u 10 u 5 U NA 200 U AMWC3 1 >14,1994 10 U 10 u K) U 10 U 20 u 20 U 20 u 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 u 20 U 20 U 20 U 20 U 20 U 10 u AMW-03 12(1/1998 5 U s u 5 U 5 U 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 U 5 U 10 u 10 u 10 u 10 u 1G U 10 u 10 u 10 u 5 U NA AMW03AR 5 U s u 5 U 5 U 10 u 10 U 10 u 10 u 01 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 U 20 U AMW-G3AR I3T3CWO S U 5 U S U 5 U 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 U AMW-G3AR JCMODl 5 U s u 5 U 5 U 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 U AMW-03AR c^efaii 5 U 5 U 5 U 5 U 10 u 10 u 10 u TO U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u ID U 10 U AMW-03AR WWWI 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u ID U 5 U AMW-G3AR (Zfizcwi 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 1D U 10 U AMW-03AR IWDCC 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 20 U AMW-G3AR 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 0 2 U 10 u 10 u 10 U 5 UR 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 UJ AMW-Q3AR W'vih 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 2 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 5 U NA 200 U :m-osa Vl2>t9W 10 U 9 J Kj U 10 U 38 20 U 4 J 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 u 3 J 21 50 U 1 J 24 5 20 UR 210 :m-osa 3/W»7 33 20 5 U 55 15 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 U 170 10 u 10 u NA NA :m-06A ewm? 20 8 J 190 210 14C J 500 U 110 J 500 U 500 U 500 u 500 U 500 U 500 U 500 U 500 U 500 U 58 J 500 U 2900 110 J 500 U NA NA :m-osa 9»1»7 12 S U 24 16 47 10 u 10 u 10 U 10 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 21 10 u 390 26 10 u NA NA :m osa &'1S/1997 5 U 5 U 5 U 5 U 30 10 u 10 u 10 U 10 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 16 10 u 200 20 10 u NA NA :m-osa •JV 29 39 5 U 27 29 10 u 10 u 12 12 10 u 10 u 10 U 10 U 10 u 10 u 18 19 10 u 15 22 16 NA NA :M 06A wn-m 81 140 5 170 49 10 u 10 u 10 u 10 U 10 u 10 u 10 U 15 10 u 10 u 10 u 25 10 UJ 900 J 27 10 u NA NA :M 06A 5WI99® 45 85 5 U 120 23 10 U 10 u 10 u 10 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 U 10 u 10 U 14 10 u NA NA :M 05A 7,3' l» 5 U 5 U S U 5 U 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 U NA NA :m-osa UlCSflW. 8 18 5 U 17 51 5 U 8 5 U 5 U 5 U 5 U 5 u 5 U 5 U 6 30 5 U 5 U 29 6 NA NA :m-05a IM19W- 20 41 5 U 44 97 U 97 U 100 u T9 U 44 19 U 19 U 19 U 49 U 97 U 29 U 97 U 97 U 19 U 97 U 97 U 97 U 97 U 70 :m-05a wim 19 53 5 U 23 10 U 10 u 10 u 10 U 10 u 10 U TO U 10 U 10 U 10 u 10 U 10 U 10 U 10 U 10 U 10 U 10 U 10 U NA :m osa 6/7/1599 5 18 5 U 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA :m-05a watis&s 48 5 U 97 3.7 70 5 U 8 06 J 5 U 5 U 5 U 5 U 19 06 J 5 U 6 36 5 U 350 47 6 NA NA :m-osa 54 J 96 J 5 UJ 72 J NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA :m-05a snarraw 58 120 5 U 120 150 7 10 5 U 5 U 5 U 5 U 5 U 75 5 U S U 11 79 5 U 1100 84 11 NA NA DRW-03 warn 5 U 5 U 5 U 5 U 10 u 10 U 10 u 10 U 2 U 10 u 10 U 10 U 10 U 10 U 10 u 10 U 10 U 10 U 10 u 10 U 5 U NA 200 U DRW-03 S U 5 U 5 U 5 U 10 u 10 u 10 u TO U 02 U 10 U 10 U 10 U 10 U 10 u 10 u 10 U 10 u 10 U 10 u 10 u 10 U NA 200 U DRW-03 ictm? 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 U 02 U 10 U 10 U 10 U 10 U 10 u 10 u 10 U 10 u 10 U 10 u 10 u 10 u NA 200 U DRW-03 isitcaw 5 U 5 U S U 5 U 10 u 10 u 10 u 10 U 10 U 10 u 10 U 10 U 10 U 10 u 10 u 10 U 10 u 10 U 10 u 10 u 10 u ID U 200 U 3RW-03 SflOCOOfc 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 U 10 U 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 200 U DRW-03 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 200 U DRW-03 K.C01Q 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 200 U LM-12A K7«»1 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u .M-12A 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 UJ LM-12A SV13CBD1 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 5 U LM-12A 12100)01 5 U 5 U 5 U 5 U 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ LM-12A WWc 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 5 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u NA 20 U LM-12A 3,-19,':'®; 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U L m2A 3rtCHM 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 5 UR 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U LM-1ZA WK 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 2 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 5 U NA 200 U LM 12 A 5 U 5 U s u 5 U 10 U 10 u 10 u 10 u 2 U 10 u TO U 10 u TO U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U NA 200 U LM-12A 3C1CT07 5 U 5 U s u 5 U 10 u 10 u 10 u TO U 02 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U .M-13A isseooi 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 1Cf u 10 u 10 u 10 U 10 u 10 U M-13A afi9H»i 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 5 U .M-13A cnocDoi 5 U 5 U 5 U 5 U 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ .M-13A 3,-seccc 5 U 5 U S U 5 U 10 u 10 u 10 u 10 u 0 2 U 10 u 10 u 10 u 5 U 10 u 10 u 10 u 10 U 10 u 10 U 10 u 10 u NA 20 U LM-13A j.i&coo:! 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u NA 200 U LM-V3A 3Me004 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 5 UR 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U NA 200 U LM-13A 3iBCOC6 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 2 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 5 U NA 200 U LM-13A ,V1« 5 U 5 U 5 U 5.8 10 u 10 u 10 u TO U 2 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U LM-13A ]«ti/3ai>7 5 U 5 U 5 U 5 U 10 U 10 U 10 u 10 u 02 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U J-15 ------- Table J-6: Summary of Historical Shallow Groundwater Quality Data (other wells with historical data for current parameters) Cleanup Goal 3en?eie s Eyi 700 Totiera 1000 Xyfenes Aoefiaphlhen«! Arenaphlhyterie Anil Seruopjtt Eteff£Oia;p 0.2 nen/o 1,1998 7200 890 170C 1900 500 U 500 U 500 U 500 U 500 U 500 U 500 U 500 U NA 500 U 500 U 500 U 500 U 500 U 16000 500 U 500 U NA NA MM-OIA 12/4/1998 7800 800 2300 2200 110 41 10 U 2 U 0 36 2 U 2 U 2 U 280 98 U 0 29 U 98 U 86 2 U 340G 91 98 U 85 9C i MM-05A 1/1 7/1994 1500 990 J 370 J 1100 370 J 140 J 210 J 180 J 1000 u 130 J 1000 U 1000 U 150 J 160 J 1000 U 410 J 290 J 1000 u 4900 970 J 480 180 J 650 MM-05A 11/17,1993 240D 900 250 1300 180 33 20 2 J 2 J 5 U 5 U 5 U 140 2 J 5 U 13 90 5 U 5900 100 12 270 140 MM-G6A _ 1Q.TLHS8 12000 730 4300 2200 01 50 U 50 U 50 U 50 U 50 U 50 U 50 U NA 50 U 50 U 50 U 94 50 U 770 140 50 U NA NA MM-06A 12/21998 10000 550 3500 2200 100 10 U 10 U 2 U 27 2 U 2 U 2 U 180 E 10 U 02 U 26 10 U 2 U 54 OG 90 10 U 71 ;•'< j UM-06A 7X1 }j'2100( 1800 510 220 430 490 49 J 100 U 1CI0 U 03 100 u 100 U 100 u 610 100 U 100 U 47 J 100 UJ 100 U 24000 J 410 47 J 2000 1700 MM 06A 1-1B-«00 6100 470 520 900 170 100 u 100 U 100 U 100 u 100 u 100 U 100 u 270 1QG U 100 u 100 U 100 u 100 U 9300 120 100 u 3600 10 U m ioa "10/1999 2400 650 910 950 130 16 19 5 U 5 U 5 U 5 U 5 U 140 5 U 5 U 9 01 5 U 5700 83 7 610 90 MRW-03 4 J 0 8 J 2 U 5 U 38 7 J 10 10 U 0 2 U 10 U 10 U 10 u 10 to U 10 u 6 J 37 10 U 61 59 4 J 10 U 20 U MRW 03 iart4CT«i 5 U 5 U 5 U 5 U 32 10 U 10 u 10 u 10 u 10 U 10 U 10 u 10 U to u to u 10 U 10 u 10 U 10 u 10 U 10 U 10 u 20 MRW-03 3£.3CTB1 5 U S (J 5 U £ U IB 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 20 MRW-03 tsccoi 5 U 5 U 5 U 5 U 10 U 10 u 10 u 10 u 10 U 10 U 10 U 10 u 10 U 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u It UJ MRW-03 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 u to u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 5 U MRW-03 'Ml 5 U S U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u If JJ MRW-03 ^CtlfC 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 5 U 10 u to u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 20 J MRW-03 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u ?<: in MRW-C3 s,io.--oo:- S U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 U to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 20 UJ MRW-03 _ larjCOOI 5 U 5 U 5 U 5 U 10 UJ 10 UJ 10 Ul 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 188 J MRW-03 3/12003 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 u 200 U MRW-03 ftioeoK 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 U 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 200 U MRW-03 fltlCKW; 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW-03 EW 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 J 10 u 10 U 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u j:.!' .. MRW-03 MKOW 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW03 W.flSM 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u to u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW-03 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW 03 mSCTW 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW 03 W905 S U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW G3 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW-03 artscwe 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u to u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW03 anrsce 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u to u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 2011 U MRW 03 3,"1C067 5 U 5 U 5 U 5 U 10 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u to u 10 u 200 U MRW-06 m&am 28 20 5 U 38 41 7 J 7 J 10 u 0 2 U 10 u 10 U 10 u 18 10 u 10 u 6 J 31 10 u 200 40 5 J 2 J 130 WRW-06 rjrt+coiso 5 U 5 U s u 5 U 51 10 u 10 u 10 u 10 u 10 u 10 U 10 u 16 10 u to u 10 u 14 10 u 10 u 56 10 u 10 u 20 MRW-06 3i23V20Cl 5 U 5 U 5 U 5 U 30 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u TO u 10 u 10 u 10 u 23 10 u 10 u 20 MRW-06 feW?C01 5 U 5 U 5 U 5 U 34 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U MRW-06 wftctwi 5 U 5 U 5 U 5 U 17 10 u 10 u 10 u to u 10 u 10 U 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 50 MRW-06 «esoi 5 U 5 U 5 U 5 U 25 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 1( lid MRW-06 WW 5 U 5 U 5 U 5 U 11 10 u 10 u 10 u to u 10 u 10 U 10 u 5 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 20 U MRW-06 esrm,- 5 U 5 U 5 U 5 U 39 10 u 10 u 10 u 10 u 10 u 10 U 10 u 5 U to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 20 UJ MRW 06 WUSM 5 U 5 U 5 U 5 U 17 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 U to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u :: UJ MRW 06 5 U 5 U 5 U 5 U 18 J 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ to UJ to UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 23 J MRW 06 jjiataci 5 U 5 U 5 U 5 U 46 10 u 10 U 10 u 10 u 10 u 10 u 10 u 10 U 10 U to u 10 U 10 U 10 U 10 u 10 u 10 U 10 u 200 U MRW-Ofi 6,'lOCJGi 5 U 5 IJ 5 U 5 U 10 U 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u 200 u MRW-06 WlClflflfcl 5 U 5 U 5 U 5 U 13 10 u 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 u 10 u 10 u 10 u 200 U MRW-06 C.VSSJ 5 U 5 U 5 U 5 U 12 J 10 UJ 10 uu 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 200 U MRW-06 jfaccw 5 U 5 U 5 U 5 U 21 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 U 10 u 10 u 10 U 10 u 10 U 10 u 10 u . MRW 06 e,7.«K>! 5 U 5 U 5 U 5 U 23 10 u 10 u 10 u to u 10 U 10 u 10 u 10 u 10 U to U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW 06 smcnw 5 U 5 U 5 U 5 U 10 U 10 u 10 u 10 u to u 10 U 10 u 10 u 10 u to U to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW 06 rcaow 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u to u 10 U 10 u 10 u 10 u to u to u 10 u 10 u to u 10 u 10 u 10 u 10 u 200 U MRW 06 J.SC0C6 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u to u 10 U 10 u 10 u 10 u to U to U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW-06 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 U to u 10 U 10 u 10 u to u 10 u to U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW-06 . 1,'ik-jiif. 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u to U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 200 U MRW-06 SfKCOOS 5 ti 5 U 5 U 5 U 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 u to U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 2QG U MRW 06 3 ------- Table J-6: Summary of Historical Shallow Groundwater Quality Data (other wells with historical data for current parameters) CJeonup God ugA. aem one S ty1 TOO Touerie 1000 Ayenes Acenapnthefi« A^enop1hylefi>i Anlfc ntnsciofc B«1ZO(ajp 0.2 tjertzo(o} 9wiiO(g.h.il Sfiid) Napnthobn 1500 Ftler rytan* 24-uiin 700 cyomde 290 Wei Dote SamelM MW-12A 20 23 5 U 31 B 19 10 u 10 u 10 u 10 u 10 U 10 u 10 u 25 10 u 10 u 10 U 10 UJ 10 u 240 17 12 10 u 200 U MW-12A acacaos 5 U 93 5 U 7 25 10 u 10 u 10 u 10 u 10 U 10 u 10 u 14 10 u io u 12 10 10 u 22 14 50 U 10 u 200 U UW-12A 14 19 5 U 22 4 62 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 270 so u 27 50 U 200 U MW 12A 22 35 5 U 3S 51 13 10 u 11 13 14 10 u 10 u 25 12 10 u 21 27 io u 21 53 12 10 u 200 U UW-1ZA I2/11C007 93 72 6.2 104 S3 10 U 10 u 10 u 10 u 10 U 10 u 10 u 56 J 10 U 10 u 14 49 10 u 300 49 10 u 200 U WW-13 7m,caw 3 J 27 3 U 28 120 4 J 6 J 100 u 0.2 U 100 u too u too u 66 J 100 U ioo u 100 U 45 J ioo u 1200 34 J 100 u ioo u 20 U WV-13 larwzooo 5 U 10 S U 8 140 J 10 U 10 u 10 u to u 10 u 10 u 10 u 140 J 10 u 10 u 10 U 75 J 10 u 790 J 66 J 10 U 10 u 10 u vlW-13 3fi2J2001 5 u 12 S U 10 220 10 U 10 U io u io u 10 u 10 u 10 u 200 10 u 10 u to u S3 io u 290 57 10 u 10 u to u MM 3 6«C0O1 5 U 12 5 U 12 170 10 U 10 U 10 u 10 u 10 u 10 u 10 u 250 10 u 10 u 15 140 10 u 180 170 10 u 10 I) 10 u MV-13 SVW'IW 5 U 5 U 5 U 5 U 10 U 10 u 10 U 10 u to u 10 u 10 u 10 u 10 u io u 10 u 10 u 10 U 10 u to u 10 u io u 10 u to u WW-13 IZftlEOOl 5 U 5 U 5 U 5 U 65 10 u 10 U 10 u 10 u 10 u 10 u 10 u 12 to u 10 u 10 U 2fi 10 u 69 17 10 u 10 u 10 u vtW-13 3AGD01 5 U 5 U 5 U 5 U 10 U 10 u 10 U 10 u 02 U 10 u 10 u 10 u 5 U 10 u 10 u 10 u 10 U 10 u 10 U 10 u 10 u NA 20 U MW-13 anaeooj 5 U 5 U 5 U 5 U 10 U 10 u 10 u 10 u 02 U 10 u 10 u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 u 10 U 10 u NA 200 U WW-13 Ktiniw 5 U 5 U 5 U 5 U 11 10 u 10 u 10 U 02 U 10 u 10 u 10 u 5 UR to u 10 u 10 U 10 u 10 u to u 10 u 10 u NA 200 UJ MW13 W-TO5. 5 U 5 U S U 5 U 25 10 u 10 u 10 u 2 U io u 10 u 10 u 10 U 10 u io u 10 U 10 u 10 u 10 u 10 u 5 U NA 200 U MM3 1!5COO€, 5 U 5 U 5 U 5 U 14 10 u 10 u 10 u 2 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u to u 10 U 10 U NA 200 U MW-13 s u 5 U S U 5U 25 io u 10 u io u 02 U io u 10 u 10 u 10 U 10 u io u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U rw-ra tlKSn5B7 5 U 5 U S U 5 U 7i 2 u 0 77 0.1 0027 004 0 05 U 002 U 36 029 0.16 14 26 0.05 u 35 55 1 3 NA NA rw-02 5 U 5 U 5 U 5 U 98 U 98 U 10 u 2 U 03 U 2 U 2 U 2 U 49 U 98 U 03 U 93 U 93 U 2 U 93 U 98 U 98 U 98 U 20 U rw-02 7rtaa>oo 5 U 5 U 5 J 5 U 4 J io u 0 8 J 10 u 0.2 U 10 u 10 u 10 u 10 u 10 U io u 1 J 2 J 10 u to u 4 J 0 7 J 10 U 20 U rw-02 ISI+CWO s u 5 U 5 U S U 10 U 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 U 10 u 10 u 10 U 10 u to u 10 U 10 U 10 U to U rw-02 3C2SKW1 5 U 5 U S U 5 U 10 u io u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 UJ io u 10 U 10 UJ to U rw-02 srtCiiot 5 U 5 U 5 U 5 U io u io u 10 u 10 u 10 u 10 u 10 u io u 10 u io u 10 u 10 u io u io u 10 U 10 u 10 U 10 u 10 U rw-02 M&Wlttl 5 U 5 U 5 U 5 U io u 10 u 10 u 10 u to u 10 u 10 u 10 u 10 u 10 u 10 u 10 u io u 10 u to u 10 u 10 u 10 u 5 U rw-02 mcooi 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u to U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u to u 10 u 10 U 10 u to UJ rw-02 3BC0TC 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 0.2 U io u 10 u 10 u 5 U 10 u io u 10 u 10 u 10 u to U 10 u 10 u NA 20 U TWH32 jnawm 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 02 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U rw-02 WfiW 5 U 5 U 5 U 5 U 10 u 10 u 10 u 10 u 0 2 U 10 u 10 u 10 u 5 UR 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u NA 200 U rw-02 viEm 5 U 5 U 5 U S U 10 u 10 u 10 u 10 u 2 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u to u 10 u 5 U NA 200 U rw-02 uijswk SO UJ 50 U. 50 UJ 50 UJ 10 u 10 u 10 u 10 u 2 U 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 u 10 U NA 200 U rw-02 3C1.uaranlhene D»benzo(a.h) -DA>enza(a,h)antliracefie lndeno( 1, 2 3-cd) lndeno( 1,2.3-cd)pyrene Phen Pfienanthrene 2 4- Qfn - 2 4-Dimethylphenol J-17 ------- mngre—i 1 r 12/00 27 0&OS 5 U 06/09 5 U 9/14 5U 03/01 6 09/04 SU 03/10 SU »15 5U 06/01 5 U 12/04 SU 12/10 SU 3/16 5U 09/01 8 I 03/0S SU \|09/I1 SU 12/16 SU 12/01 5U1 06/05 SU 06/12 5U 09/17 5 UJ 03/02 SU \| 0905 5 U I 03/13 5u\| 06/18 5U 06/02 SU 1 12/05 SU ' 12/13 5 U 04/20 5U 09/02 5 U I 03/06 S U \| 04/22 5 U 12/02 SU 1 06(06 5 U fli/M—)S-W-f>08/CH 06/03 5U I 12/06 SU pRWMl 09(03 5 U \| 0M7 5U 12/03 5_U 1 12(07 5 U LM52A T I 01 S4 160 j 03/03 SU \| 10/97 SUl 03/03 5 U 101(17 10/Se 130 , 09/03 SU , 12/07 12/98 S UI 12/03 14 \| 03/07 07,00 ( J . 03/04 S U . 06/08 12/00 22 1 06/04 5 U \| 03/10 03/01 5 U, 09/04 5U . 12/10 06/01 SU\| 12/04 5U I 09/11 09/01 34 03/05 S U 06/12 _ SZfll 5Jul\| ,,-14^,03/13, QW-04 \| 11/98 SU ,03/07 SU 8W90- SU\|l2/07 5 U 12/00 su oaoa su 03/01 5 U 106/09 5 U 06/01 5 U 03/10 SU 09/01 5U 12/10 SU 12/01 5 U 09/11 SU 03/02 5 U 06/12 SU 03/03 5 U 03/13 SU MRW-06 07/00 " 28 12AO lo 03/07 5 U MW-12A 01/94 03/87 DRW 03 03/05 to 03/10 5 U TTTiT 03/01 06/02 06/02 5U 12/05 SU 09/14 5U 00/02 5 U1 03/06 14 1 05/15 5 1 -4a»a S-U- I -06^«——S4i ,, """V CII -1?/l»t '1 '\|12®B 5U I 09/17 5 UJ 1 1 06/18 5U j I 04/19 5 U 04/20 5 U • 04/21 5 U 04/22 5 U 1\|00 5!W E9/Q5 5 U "J5S53 SU 03(01 150 1)2/05 5 U OJ/01 54 33,06 5 U iSol 7 \|06/OS 5 U 06/02 7 'bsfflc 4IL 06/02 7 Il2ffl6 SU 09/02 ! 7 'oil07 SU, 12/02 99 j ','07 \| 12 03(03 170 'fciiWlJ 96 O 06/CI -st 106/09 ! ¦ 'J D j3a'03. 12/03 S UI12/10 5U -j 1W1 I no/11 200 0SW. jjjp——r- 0»04 5UI03/13 TC 03/06 5 U 05/15 5 U 03/07 5 U 03/16 5 U -UW6-5-U J 09/17 5 UJ [06/18 5 U 9 04/20 5U J\ loaa su bott 12/02 03/03 OB/03 DS/03 12/03J 03»-t MM-03* LM-13A D3/01 to 03/07 5 U ps/oi 12"01 oa/o2 09(02 MRW-03 rero 4 j 12/00 to 03/07 SU 07/00 a.ooD 12/00 4.200 1,900 » (66(6^ j V.900 —' OW01 "H"'3.700 12/01 1.900 o,!rojv i.teo f 06/02 > 9,310 I , 09103 \| yygj 3 270 - - -i~~ TwSJ-Tio 12/98 7 qTTCIO 120 iwdo 8 03/01 2« 06/01 13 09/01 10 12701 5 L &m-<—& 06/02 1 0 09/02 11 SaesZ^sS. 03/03 18 12/04 03/05 06(05 0905 12(06 03/06 06/06 08/06 0&01 lo Q3X3T 5 U 720Z 03(03 06/03 09/03 1203 03/04 LM-03A LM-D1AR 01/94 10 U 11/98 5 U 07/00 5 U 12/00 5 U tsmi— eu 06/01 >U 09/01 )U 12/01 iU LM-OJA JJL-U 12/06 14 03/05 09/05 12/03 6.900 MRW-01 09/07 13 12/07 5 U 09/08 13 06/09 50 i 03/10 12 .. 12/10 5 U 09/11 5 U 06/12 5 03/13 5 U 12/13 SU 09/14 5U 05/15 fi U . 03(16 S4\| 12/16 5 U 09/17 5 U 06/1B 5U 04/20 SU ¦lot gZ~~ "513 MKW-02 3JE0X 0®03 12/03 03/04 ow 03/05 oaro 03/06 06/06 03/07 1207 09/08 06(09 03/10 12/10 '{EBKEyl 12/07 09/08 06/09 03/10 12/10 09/11 06/12 03/13 12/13 09/14 05/15 03/16 12/16 09/17 03/05 21 user msrar 09.02 12/02 03(03 06/03 09/03 12/03 0304 06AM 09/04 12/04 03/05 08/05 09(05 09/04 03/05 09/05 03/06 08/06 03/07 12/07 09/08 06/09 03/10 12/10 09/11 06/12 03/13 09/14 05/15 06/00 5U M27D5- 12/00 5 U 103(06 03/01 5 U I 06/06 08/01 S U \| 08/06 09(01 5UI 12/06 .12/01 5 U j 03/07 (81/02 5 U 112/07 .56/02 7 .G9/08 09/02 5 U \| 06(09 12/02 5 U ,01(10 03/03 5 U \| 12/10 06/03 5 U 09/11 39/03 8 106/12 06/04 5U. 03/13 "-OSP2— 03'03 03/04 03/05 03-06 03/07 12A57 09/03 06/09 12/10 09/11 06/12 03/13 T2P3 0W14 05/15 03/16 12/16 09/17 MW-D7AH 106/18 90. \|04/1S 64, ,04/20 \|04/2l ,04122 M 07/00 SfJ 12/00 s Ij 03101 S Li 06/01 S U 09/W— 6d i2rtii su / 03/02 5 U 03/03 SU 03/04 5U 03/05 5U 03/06 5 U 03/07 5 U 12/07 SU 09/08 5 U 06/09 5 U 03/10 5 U 12/10 42 09/11 14 08/12 SU 03/13 S U I FORMES ( 1 retail i ' GAS 1 f STATION I , (»«« , lcicmiqn)! 09/97 SU 112/01 5£l OB/97 5 U 103/02 fU 02/98 5 U 103/03 SU D5/98 5 U \| 03/M/S U 07/98 5U\|03,'1)K SU TO5E "2T i03®6 5 U 12/98 5 U 103/07 SU D3/99 SU ,12/07 5 U 36«9 5u\|09/08 SU "KBVWVSTJ ,08/09 SU 07/00 5 \l \| 03/10 5 U 12/00 5/) 12/10 5U 33/01 jU 09/11 5U 36/01 A U 06/12 5 U 09/01 /5 U 03-13 5 U / 12/13 S U / I 09/14 SU / ' 05/15 SU / I 03/15 SU / 1 12/16 5 U / \| 09/17 5U, ' ' 06/18 5 U / I 04/20 5 U 1 04'22 5II W 01(06 08/06 12/06 03/07 e-fWT3—TO" 5 u oa/14 5 u 5 U 05/15 5 U 5 U 03/16 5 U 7 I 12/16 5 U ' 09/17 5 U I 06/18 5 U I 04/19 S U I 04/20 SU I 04/21 5U 104/22 SU 105(23 5 0 ! WST 12/04 03/05 06./0S KfflS 0 SO 04(21 04/22 0H3 12713" 09/14 05/15 m/iA 3STT 03/16 12/16 09/17 06/18 --u' 1. 12/13 t Ui 09/14 su; 05/15 5tn ~\| 103/16 S u ! 12/16 5 U j 09/17 SU " 06/18 5 U J m suiwa. su TjWDff" 0009 03/10 12/10 03/11 06/12 03/13 12/13 09/14 05(15 03/16 12/16 03/17 08/18 04/19 04/20 04/21 0 72 04/20 180 04/21 177 04/22 1,080 •ft Mi 15ii~ 09/17 06/18 04/19 04/20 04/21 04/20 5 U 04/22 5U DOMINION ENERGY SOUTH CAROLINA, INC £555525 01/94 10 u 03/97 to 0307 07(00 3 J 12/00 to 03/07 SU 0 BENZENE IS GENERALLY FOUND ABOVE THE REPORTING UMIT OF 5 UGA ^ BOIZENE IS PREDOMINANTLY TO ALWAYS BELOW THE REPORTING UMT OF 5 UG/L 0 INDICATES BENZENE WAS INI 1IALLY FOUND ABOVE S UG/L mo WITH TIME IS PREDOMINANTLY BELOW 5 UGA 1 I MAY 2023 ANALYTICAL RESULTS NOTE: 1) RESULTS IN UGA 2) FORMERLY SAMPLED WELLS SHOW RANGE OF TIME PERIOD SAMPLED AND RESULTS. WHEN RESULTS DIFFERED FROM THAN CONSISTENTLY OBSERVED (e.g. 5 U). THAT RESULT IS SHOWN. 3) WW-12A WAS FORMERLY SAMPLED AND SINCE RESULTS VARIED OVER TIME. THE HISTORICAL RESULTS ARE SHOWN. HISTORICAL BENZENE GROUNDWATER ANALYTICAL RESULTS THROUGH MAY 2023 EVENT CALHOUN PARK AREA SITE CHARLESTON, SOUTH CAROLINA DATE: 9/20/23 FILEMAME; CPA092 FORMERLY SAMPLED WELL GRAPHIC SCALE APEX COMPANIES, LLC Figure J-3: Historical Benzene Groundwater Analytical Results Through May 2023 J-18 ------- LM-10AR 1100 ,06/04 10 I 06/09 10 U 09/14 10 U 10 UJ \| 09/04 10 U 103/10 10 U 05/15 10 U 20 ,12/04 10 U 112/10 10U 03/16 tO U 03/05 10 U 109/11 10 UJ 12/16 33 06/05 10 U 106/12 25 U 09/17 10 UJ 03/13 10 U 06/18 10 U 12/13 40 04/20 9.7 U I 04/22 9.9 U Figure J-4: Historical Naphthalene Groundwater Analytical Results Through May 2023 J-19 ------- Table J-7: Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL (December 2000 to May 2023) Sampling Event A3-T3 CM-03A LM-01AR LM-10AR MM-03A MM-11A MRW-01 MRW-05 MW-12A MZ-06M MZ-55A ORC-7 PM-02A Dec-00 NP(1) NP NP NP TRACE 0 30 NP TRACE 0 06 0 14 TRACE NP Installed 10/21/01 Mar-01 NP 0.40 NP NP TRACE 0 30 NP NP TRACE NP TRACE NP Jun-01 NP 0.10 NP NP TRACE 0.40 NP NP — 0.30 TRACE NP Sep-01 NP 0 12 TRACE NP TRACE 0 63 NP TRACE - 1.25 0 05 NP Dec-01 NM(J> — NM 0.2 — — NM NM — — — NM NM Mar-02 NM 1.09 NM TRACE TRACE 1.54 NM TRACE — 1.40 TRACE NM NM Apr-02 NP - - - - - - — — - - - - May-02 NP — — — — — — — — — — — — Jun-02 NP 0.70 NP NM 0.10 0.90 NP TRACE — 0.52 0.45 NM NM Jul-02 NP — — — — — — — — — — — — Aug-02 NP — — — — — — — — — — — — Sep-02 NP 0.30 NP 0.17 TRACE 0.23 NP TRACE TRACE 0.10 0.53 NP TRACE Oct-02 NP — — — — — — — — — — — — Nov-02 NP — NP 0 10 — — NP TRACE — — — — — Dec-02 NP 0.75 NM NM TRACE 1.40 NM NM NM 0.40 0.80 NM NM Jan-03 _<3) - TRACE TRACE - - TRACE TRACE - - - - - Mar-03 NP 0 75 TRACE TRACE ! TRACE 1 03 ! TRACE TRACE 0.25 TRACE 0 50 NP TRACE Apr-03 — — TRACE TRACE — — TRACE TRACE — — — — NM Jun-03 NP 2 00 NP 0 10 TRACE 0 97 TRACE TRACE 0.25 0.55 0 15 NP NM Jul-03 — — NP 0 10 — — NP TRACE — — — — NM Sep-03 NP 0.63 NP 0.10 TRACE 070 TRACE TRACE 040 0.85 0.88 NP NP Oct-03 - — NP 0 30 — - NP TRACE - j — — — NM Jan-04 — — NP NP — — NP TRACE — — — — — Mar-04 NP 0.58 NP TRACE 0.01 1.50 NP TRACE 0.80 1.42 TRACE NP NM Apr-04 - - NP NP - - TRACE TRACE - - - - - Jul-04 — — NP TRACE — — NP TRACE — — — — — Sep-04 NP 0 70 NP TRACE TRACE 0 98 NP TRACE 0 50 060 ¦ TRACE NP NM Oct-04 - - NP 0 30 - — NP TRACE - - - - NM Jan-05 — — NP 0 52 — — NP NP — — — - — Mar-05 0.73 0.55 NP 0.45 TRACE 060 NP 0.14 0 89 0.54 0.91 NP NM Apr-05 - - NP 0.52 - - NP NP - - - - NM Jul-05 — — NP 0 52 — — NP TRACE — — — — — Sep-05 0.10 1 12 NP 0.52 TRACE NM NP TRACE TRACE 1.43 0.92 NP NM Oct-05 - — NP 0.52 — — NP 0.20 — — — — — Jan-06 — — NP 0 60 — — NP NP — — — — NM Mar-06 0.01 1.08 NP 0.60 TRACE 0 11 NP NP 0.38 0.58 0.40 NP NM Apr-06 - - NP 0.53 — — TRACE NP - - - - - Jul-06 — — NP 0.73 — — TRACE TRACE — — — — — Sep-06 TRACE 0.65 NP 0.73 TRACE 0.30 TRACE TRACE 0.30 0.95 0.75 NP NM Oct-06 — — TRACE 0.50 — — NP TRACE — — — — — Jan-07 — — NP — — — NP TRACE — — — — — Mar-07 TRACE 0.51 NP 0.50 TRACE 0.60 NP TRACE 0.40 1.61 0.51 NP NM Apr-07 — — NP 0.20 — - NP NP - — — — — Jul-07 — — — — — — — TRACE — — — — — Oct-07 — — — — — — — TRACE — — — — — Dec-07 TRACE 0.79 NM TRACE I TRACE 0.63 — NP 1 86 0.83 TRACE TRACE NM Jan-08 — — — _ — — — TRACE — — — — — Apr-08 — — — — — — — 0.03 — — — — — Jul-08 - - - - - - - NP - - - - - Sep-08 TRACE 0.77 NP 0 12 NP 0 65 NP NP 0.24 0.28 0 16 TRACE NP Oct-08 — — — — — — — NP — — — — — Jan-09 — — - — — — — TRACE — — — — — Apr-09 — — — TRACE — — — 0 02 — — — — — Jun-09 0.07 0.44 NP NP TRACE 0.62 NP TRACE 0.15 0.59 TRACE TRACE NM Jul-09 - — — — - - — TRACE - - — — - Oct-09 — — — — — — — TRACE — — — — — Jan-10 — — — — — — — NP — — — — — Mar-10 0 18 0.32 NP — TRACE 0.42 NP NP 1 05 0.10 NP 0.10 NM Apr-10 — — — TRACE — — — TRACE — — — — — Jul-10 — — — — — — — TRACE — — — — — Oct-10 — - - - — — — NP — — — — — Dec-10 0.25 0.28 NP - TRACE 0.48 NP NP 084 TRACE 0 18 TRACE NM J-20 ------- Table J-7 Continued: Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL (December 2000 to May 2023) Sampling Event A3-T3 CM-03A LM-01AR LM-10AR MM-03A MM-11A MRW-01 MRW-05 MW-12A MZ-06M MZ-55A ORC-7 PM-02A Jan-11 — — — — — — — NP — — — — — Apr-11 — — — NP — — — NP — — — — — Sep-11 0.15 0.38 NP — TRACE 0.63 NP NP 0.82 TRACE 0.66 TRACE TRACE Oct-11 — ~ — — — — -- NP — -- — — — Jan-12 — — — — — — — NP — — — — — Apr-12 — — — TRACE — — — NP — — — — — Jun-12 0.37 TRACE NP — TRACE 0.64 TRACE NP 115 TRACE 0 83 0.18 TRACE Jul-12 — — — — — — — TRACE — — — — — Oct-12 — — — — — — — NP — — — — — Jan-13 — — — — — — « TRACE — -- -- -- — Mar-13 0.03 2.25 NP TRACE TRACE 0.82 NP TRACE 0.38 TRACE 0.43 TRACE NP Apr-13 — — — — — — — NP — — — — — Jul-13 — — -- — — — -- NP ~ — — — — Oct-13 — — — — — — NP — — — — - Dec-13 0.25 1.60 NP — TRACE 110 NP NP 1 25 NP 1 62 TRACE NP Jan-14 ! 0.22 — — — — — — NP — — — 0.12 - Apr-14 — — 0.07 — — — NP — — — TRACE — Jul 14 TRACE — — — — — — TRACE — — — TRACE — Sep-14 TRACE 1 22 NP ~ TRACE 1.42 NP NP 1.30 NP 1.40 TRACE NM Oct-14 0.20 — — — — — — NP — — — TRACE — Jan-15 — — — — — — — NP — — — NP — Apr-15 — — — 0.15 — — — NP — — — NP — May-15 TRACE 1.12 NP — 0.02 1.05 NP NP 0.42 TRACE 1.05 NP TRACE Jul-15 NM — — — — — — NP — — — TRACE — Oct-15 — — — — — — — TRACE — — — TRACE - Jan-16 : 0.24 -- — — — — ~ TRACE — — — TRACE — Mar-16 0.24 0.85 NP — TRACE 1.20 NP TRACE 0.60 0.60 1.20 TRACE NP Apr-16 0.22 — — 0.80 — — — NP — — — TRACE — Jun-16 0.10 — — — — — — TRACE — — — TRACE — Oct-16 TRACE — — — - — — NP ~ — — NP — Dec-16 — 0.98 NP 0.80 TRACE 1 20 NP — 0.70 TRACE 1.20 — NP Jan-17 0.30 0.80 — ~ — 1.10 ~ TRACE 1.05 TRACE 1.20 TRACE — Feb-17 — 0.73 — — — 1.90 — — 1.15 — 1.10 — — Mar-17 — 0.67 — — — 1.93 — 1.35 — 1.20 — - Apr-17 — 0.90 — 0.18 — 0.66 — — 0.28 — 0.89 — — May-17 0.28 0.80 — — — 045 — TRACE 0.70 TRACE 1.03 TRACE — Jun-17 — 0.95 — — — 1 50 — — 0.75 — 1.00 — — Jul-17 — 0.45 — — — 1.55 — — 0.70 — 1.00 — — Aug-17 0.32 0.75 — — — 2.35 — NP 0.75 NP 0.94 TRACE — Sep-17 — 0.95 NP 0.18 0.21 1.20 NP — 0.25 NP 0.77 — TRACE Oct-17 — 1.00 — — — 2.20 — — 0.44 — 1.18 — — Nov-17 TRACE 1.22 — - — 1.03 — NP 0.55 TRACE 1.00 0.2 — Dec-17 - 0.80 - - ~ 0.80 - - 0.55 » 1.15 - — Jan-18 TRACE 1.35 — — — 0.98 — NP 0.84 TRACE 1.41 TRACE — Feb 18 — 0.95 — - — 1.30 — — 0.85 - 0.80 — - Mar-18 — 0.78 — — ~ 1.68 — — 0.38 — 0.54 ~ — Apr-18 0.20 0.83 ~ ~ — 1.90 — NP 0.55 TRACE 0.70 TRACE ~ May-18 — 1.00 — - 1.70 — - 0.60 — 1.75 - Jun-18 - 0.66 NP TRACE TRACE 0.75 NP NP 0.37 - 0.74 TRACE NM Jul-18 TRACE 0.65 — — — 1.15 — NP 0.35 TRACE 0.76 TRACE - Aug-18 — 0.62 — — — 1.41 — 0.74 — 0.89 __ - Sep-18 I — 1.00 — — — 2.02 — ~ 0.58 — 1.05 ~ — Oct-18 TRACE 0.93 — — — 1.68 — NP 0.44 TRACE 1.18 TRACE - Nov-18 — 0.60 — — - 1.05 — — 0.70 1.15 ~ -- Dec-18 - 0.83 - - ~ 0.72 — -- 083 -- 0.95 - — Jan-19 0.15 0.99 — — — 1.30 — NP 0.85 TRACE 0.89 TRACE — Feb 19 — 0.78 — -- — 0.85 — — 0.45 1.10 — — Mar-19 — 080 — — — 1 00 — — 033 — 070 — — Apr-19 025 0.63 NP TRACE TRACE 0.82 NP NP 0.60 TRACE 1.05 TRACE NM Apr-20 TRACE 0.5 NP NP TRACE 1.78 NP NP 0.20 TRACE 1.20 TRACE — Mar/Apr-21 0.31 1.00 NP NP TRACE 0.62 NP NP 0.10 TRACE 1.20 NP — Mar/Apr-22 TRACE 0.60 NP NP NP 1.38 NP NP 0.62 TRACE 1.10 TRACE — Mar/May/June-23 TRACE 0.75 NP NP TRACE 1.53 NP NP 0.15 NP 1.65 TRACE - Notes: (1) NP - No Product (2) NM - Not measured due to access constraints (3) — Not measured during tNs event J-21 ------- SOUTH GASOU** STATE PORTS AUTHORITY (SCSPA) PROPERTY (WTERIOOWM® S-fFT pa P WALL SCSPA ELECTRICAL SUBSTATION DRAINAGE, outfall DRW-20 DRW-27 DRW-25 ^ ORW-'0 i CONTROL BUILDING DRW-28 , DRW-11 RESIDENTIAL I FORMERI I RETAIL I gas I I STATION, f (APPROX. I 1 LOCATION), ARTESIAN W£LL TWD-STOKY WQ00\RES1D DRW—13 HIGH VOLTAGE EBMW-03 ABOVE GROUND CABLE TRENCH >RW—00 THREE STORY BRICK BUILDING rDRW-11 DRW-1J LUDEN'3 MARINE EBMW-D5 DRW—23 DRW-21 ] DRW—41 \ # j DRW- [ DRW—36 0 DRW—37- DRW—38 SINGLE—STOftY -j snjcco J EBMW—04 APPROXIMATE LOCATION OF RETAIL BUILDING BURIED SEA WALL OISHE?. HAMFflCK fie MYERS REALTY UNOCIlOniOtiWD CONCRETE LOADING AREA MW-12A 1 FORMER \| [AUTO BODY SrfOR I (APPROX. LOCATION) BUS LANE MRW-02 AQUAR/OM WHARF ro. SERVICE AREA DRW- 50 DRW—48 MW-Q7AR SOUTH CAROLINA AQUARIUM CITY OF CHARLESTON PARKING GARAGE FORMER \| j RETAIL . ' GAS ' \| STATION \| , (APPRCK. , J LOCATION)/ UBERTY SQUARE (GRASS AND TREES AREA) CHARLESTON CAfLWAY CENTER SEWER VORTEX INTERLOCKING SHEET PILE WALL (20* DEEP) APPfl0X- LOCATION OF 42" RCP STORM SEWER APPROX. LOCATION OF TOUR BOAT FACILITY [APPROX. LOCATION OF 42" RCP CALHOUN STREET DOMINION ENERGY SOUTH CAROLINA, INC 0 SHALLOW PIEZOMETER MONITOR WELL SHALLOW jff DNAPL RECOVERY WELL ^ WELL THAT HAS EXHIBITED INTERMITTENT OR "TRACE" AMOUNTS OF DNAPL - DECEMBER 2000 THROUGH PRESENT SHALLOW GROUNDWATER MONITORING WELLS WITH INTERMITTENT AND/OR "TRACE" AMOUNTS OF DNAPL CALHOUN PARK AREA SITE FENCE JhE fcPPfKWIMl.TE LDCAT1CW OF STORM SEWE3K 100 200 FEET GRAPHIC SCALE j: CHARLESTON, SOUTH CAROUNA DATE: 8/15/23 FILE NAME: CPA091 APEX COMPANIES, LLC Figure J-5: Shallow Groundwater Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL J-22 ------- DOMINION ENERGY SOUTH CAROLINA. INC ILLUSTRATION OF BENZENE CONCENTRATIONS CALHOUN PARK AREA SITE CHARLESTON, SOUTH CAROLINA DATE: 9/11/2023 FILE NAME: BENZENE 0523 POST-IRA-April 2020 POST-IRA-April 2021 -FGFND 5-50 ug/L 50-500 ug/L 500-5,000 ug/L > 5,000 ug/L Note: Due to "numeric dispersion" the boundary extent shown may be overstated APEX COMPANIES. LLC POST - IRA - September 2014 POST - IRA - March 2010 POST - IRA - March 2004 POST - IRA-June 2018 START OF IRA - December 1998 POST - IRA - September 2017 POST-IRA-April 2022 Rl Event-January 1994 POST-IRA-May 2023 Figure J-6: Illustrations of Benzene Concentrations from January 1994 to May 2023 J-23 ------- POST - IRA - September 2017 POST - IRA-April 2021 POST-IRA-April 2022 POST - IRA - May 2023 DOMINION ENERGY SOUTH CAROLINA. INC. ILLUSTRATION OF NAPHTHALENE CONCENTRATIONS CALHOUN PARK AREA SITE CHARLESTON, SOUTH CAROLINA DATE: 9/12/2023 FILE NAME: NAPH 0523 APEX COMPANIES. LLC POST - IRA - September 2014 POST-IRA- March 2010 LEGEN1 5-50 ug/L 50-500 ug/L 500-5,000 ug/L > 5,000 ug/L Note: Due to "numeric dispersion" the boundary extent shown may be overstated. START OF IRA - POST - IRA - April 2020 POST - IRA-June 2018 Rl Event - JaWiary l^f^y Figure J-7: Illustrations of Naphthalene Concentrations from January 1994 to May 2023 J-24 ------- APPENDIX K- INTERMEDIATE GROUNDWATER DATA K-l ------- Table K-J: Intermediate Sand Unit Groundwater Monitoring Wells Wells Location Upper Sond BM-03D BM-04D MM-13C PAMW-02 Sector 9 - East Bay Charlotte Street SCE&G Substation Sector 1A - SC State Ports Authority Middle Sand BM-10C Sector 9 - East Bay MM-02D MM-T2B PM-01C SCE&G Substation SCE&G Substation NPS Property Sector 2A - SC State Ports Authority Lower Sand MM-01D MM-IGD SCE&G Substation SCE&G Substation Notes: (i) Three wells were eliminated from the program ;r> 2015 and niclude BM-08B (abandoned on May 28, 2015), and BM-07C and CM-11D based on multiple non-detections and prior recommendations i,2) LM-Q9B was el minated from the program in May 2017 based on multiple non-detections and prior recommendations (3) MM- S4C was ei'minated from the program based on the August 16. 2019 request approved by SCDHEC on September 6.2319. (4) Sentinel wells (LM-08C and NM-06D) are sampled on a biennial frequency, rnciuding December 2022. K-2 ------- Table K-2: Analytical Parameters and Methods for Intermediate Groundwater Monitoring Program EPA Reporting Cleanup Constituent Method Limit ffjg/L) Goal (M0/L}!" Volatile Oraanie Constituents: Benzene 8260C 5 5 Ethylbenzene 8260C 5 700 Toluene 8260C 5 1,000 Xylenes, Total 8260C 5 10,000 Semi-Volatile Oraanie Constituents Benzo(a)pyrene 8270D 0,2 0.2 Carbazole 8270D 5 5'2' Naphthalene 8270D ¦0 1.500 Notes: (f) Re mediator) goals obtained from EPA Record of Decision for OU #2 at the CPA Site {September 2002}. (2) Indicates cleanup goal derived from nsx based calculations, rather than dnnking water standards (MCls) A revised goal of 53 jjg/L has been proposed for shallow groundwater (3) Because the laboratory reporting limit (RL) varies with diluton. the laboratory provides analytical results between the method detection limit (MDL) and RL and qualifies the results as estimated, •J". K-3 ------- MIOOLE SANS UNIT WELLS SOUTH CAROLINA STATE PORTS AUTHORITY CONTAINER STORAGE AREA LOWER SAND JMT WELLS ABANDONED WELL UPFER SAME UNIT SAMRUNG LOCATION MIDDLE SAND uNIT SAMPLING LOCATION (BIENNIAL AT LM-06C AND NW-G6D) LOWER SAND UNIT SAMPLING LOCATION pm-828 sea3* ELECTRICAL SJ^STATlos PU—QIC PERMEOX PLUS OR EHC-0 TREATME!\T SECTOR "RUCK ACCESS ROJTE FENTON'S REAGEhJT TREATMENT SECTOR REPRESENTS SECTOR IDENTIFICATION EMbSMStt. MW-IEC f jsaisgssg^i: CONTROL BUUDiNC LV-36C iSHEn TWJ—iTCT WO\RESIO FWMER \| RETAIL CAS STATIC* (VPWflK ! y^ncwji MW-02D HGH voltage above GiMXINB CABLE TRENCH THREE STORY 3RICK BUILDING LUCEN'S MARINE F3w_n HIGH vtLTACE APPROXIMATE LOCATION HETAJL BUIU3WC JMHC' HAUI"i:> A M1EFS SHGLE-STCftr STUCCO CMU BUILDIK &JB1E0 SEA ALL CvftCHETE LOAHIVG AfiEA FORMER AUT10 PPDr SHttR BUS LANE AOtMmw WHARr xOAD SERVICE AREA APPROXIMATE GARAGE LOCATION SOUTH CAPOUNA AO.iA.RIUV ~T RPWE^ ] , RETAIL , J GAS I I ST«11C« \ ' (AaPR{J3«. , I LCCATKIKJ ~BETTY S3UARE (CRASS AND TREES AREA) CHARLESTON GATEWAT COLTER FIGURE 1 DOMINION ENERGY SOUTH CAROLINA. INC INTERMEDIATE GROUNDWATER MONITORING LOCATIONS CALHOUN STREET U INTERLOCKING SHEET PILE WALL (20' liEEPJ NOTE: 1) WELLS AM-CHD, EW-01D, DM-01D, AND DM-OJD WERE ABANDONED ON DECEMBER S AND 6,1004 AND THEREFORE ARE NOT SHOWN, 2\| WELLS 3M-0BBIC AND SM-11B'C WERE ABANDONED ON MAY 28, 2015, CALHOUN PARK AREA, SITE CHARLESTON, SOUTH CAROLINA DATE- 4/1J/ZQ RLE VAME. CPAIGW073 GRAPHIC SCALE APEX COMPANIES, LLC 4- !¦«-!} LEGEND - JP=E=? SAND LNfT WELLS Figure K-l: Intermediate Groundwater Monitoring Locations K-4 ------- SOUTH CAROLINA STATE PORTS AUTHORITY CONTAINER STORAGE AREA "RUSK ACCESS HOJTE CHARLorrr strcct DATE BENZENE NAPHTHALENE 11 .'00 4,200 10 U 10/01 2,600 10 U 05/05 4,600 13 U 02/06 3,100 10 U 09/06 IS,000 10 U 03/07 3,700 10U 09/07 1,700 10 U 06/08 3,8-00 10 U Q3/Q9 4,700 10U 12/09 NS NS 08/10 1,200 10U 06/11 340 10U 03/12 130 10 u 12/12 5 U 10 Lf 09/13 5 U 10 u 05/14 5 U 10U 03/15 52 10 u 12/15 63 10 LT 09/16 5 Lf 10 U 06/17 5U 10 u 03/18 906 10 u 12/1B 174 1DU 12/19 43 10 u 12/20 5U 10 u 11/21 6,1 iq u 12/22 8.7 9,3 U LEGEND UPPER INTERMEDIATE SWD UNIT WELLS ABANDONED WELL ~2 - PERMEOX PLUS OR EHC-0 TREATMENT SECTOR - FEVTDN'S KEAGEVT TREATMENT SECTOR 1A - REPRESENTS SECTOR IDENTIFICATION NOTES; 1) ALL RESULTS ARE IN UG'l, 2) J - THE RESULT \|S APPROXIMATE , S) U -THE CONSTITUENT WAS NOT DETECTED. -fli NS. NOT SAMPLED. 5) PAUV.M12 WAS NOT SAMPLED )NS\| IN t2,'IM DUE TO SECURITY CONSTRAINTS. 6) BASED ON THE (WID ANALYTICAL RESULTS FSOiM MM-13C, \|T IS BELIEVED THAT MW-1,10 WAS INADVERTENTLY SAMPLED SINCE THE BENZENE AND NAPHTHALENE RESULTS ARE COMPARABLE TO MWM.1D HISTORICAL RESULTS, 7) BM-PHB ABANDONED ON UAj ZB, Z015. j FORMER , DETAIL ' I =as I I STATION CHAF I < ArPftO.«- i urc4-ns»o, GATEVi/ — DATE BEN2ENE NAPHTHALENE 05/00 60,000 9,600 08/00 29,000 3,600 11 m 30,000 9,500 t0/01 35,000 11.000 12/01 45,000 J 7.600 04105 54.000 11,000 02/06 10>000 7,600 09/06 37,000 9,900 03/07 21,000 14,000 09/07 14,000 5,900 J 06/00 30,000 15,000 03/00 35,000 16.000 12109 28,000 J 7,600 OB/10 34,000 11,000 06/11 24,000 12,000 03/12 19.000 14,000 12/12 26,000 14,000 09/13 25,000 6,200 05/14 30,000 10,000 03/15 27,500 13,300 12/15 26,300 10,600 09/16 26,200 J 9.640 J 06/1 7 23.300 11,800 03/1B 21,400 10,900 I2na 24,500 14.300 12/19 24,200 6.990 J 12/20 20,200 3,540 11/21 20,900 9,510 12/22 24,700 10,600 ^r'^TliVS MM-t3 C DATE BENZENE NAPHTHALENE 10.'01 56.000 4.600 12/01 43.000 J S.500 05/05 33,000 7,300 02/06 34,000 J 4,400 J 09/06 45,000 4,100 03/07 5-6,000 4,800 09/07 S.6Q& 4,100 06/08 36,000 3,600 03/09 39,000 5,500 12/09 29.000 5 U 3'9QQ <6> 10 IT ' 08/10 06/11 31,000 4,300 03/12 16.000 3,300 11/12 23,000 4,500 09/13 39,000 3,300 05/14 34,000 3,900 03/15 1,540 3,460 12/15 33,000 3,500 HIS/16 25.000 3,610 (16/17 IB,300 4, see 03/18 26,400 2,760 12/18 29,000 4,570 12/19 28.400 J 2j43Q 12/20 17,900 763 11/21 22.400 2,990 12/22 17,300 3.200 DECEMBER 2022 EVENT AND HISTORICAL BENZENE AND NAPHTHALENE ANALYTICAL RESULTS UPPER INTERMEDIATE SAND UNIT CALHOUN PARK AREA SITE CHARLESTON, SOUTH CAROLINA RLE NAME- CPAICW083 APKX COMPANIES, LLC Figure K-2: Historical Benzene and Naphthalene Analytical Results in Upper Intermediate Sand Unit from 2000 to 2022 K-5 ------- BM-10C DATE BENZENE NAPHTHALENE 10/01 14,000 1,800 04/05 20,ODD 2200 02/06 5.900 160 Mm 46 150 E 03/07 5,8 10 U 09/07 5 U 10U 06/0B 5U 10U 03/09 5 U 10 U 12/09 9 U 10U 08/10 NS NS oe.ii NS NS 03/12 9,1 iou 09/13 3P7DD 390 05/14 7,700 830 03/15 6,510 996 12/15 9.890 1.220 09/16 7r370 385 06/17 155 10U 03/16 5.230 411 I2i'18 10,300 988 12/19 4.980 408 \ 2,(20 5.350 292 11/21 NS NS 12J22 2,300 667 n npnp. t UYEK OElLTt CM-11D l~DATE BENZENE 0M00 OSi'DQ llrtNt IWOt (WD5 07JD6 09.06 OJi'OT 0B.'D7 OEi'DB OZHW 12/0-3 06.10 06.'11 03/12 12/12 09/11 05/14 01/15 12/15 06/17 12/18 12119 12/20 11/21 12/21 HAPHTHALEHE 9,400 32 S.9O0 43 12,000 10 U 5.600 69 48 10 U 41 10 U 360 10 U S3 10 U 2,700 10U 19 10U $ 10U 7 10 u 9.2 10 u $U 10U 5,4 IOU 5 U 10 u 5U 10 u $U 10 U sir 10 u NS NS NS NS NS NS NS NS NS NS NS NS NS NS legend MIDDLE INTER VEDIATE SAND LIMIT WELLS ABANDONED A'ELL I - PERMEOX PLUS OR EHC-0 TREATMENT SECTOR FENTON'S REAGENT TRE^.TME^T SECTOR REPRESENTS SECTOR IDENTIFICATION ~ 12 - NOTES: 1) ALL RESULTS ARE in U&'L, 2) E - THE CQNSTIIUENT WAS DETECTED ABOVE THE CALIBRATION CURVE, 2) R- UNUSABLE RESULT, 41 U -THE CONSTITUENT WAS NOT DETECTED AT THE REPORTING DETECTION LIMIT. 5'J Uvl - THE CONSTITUENT WAS NOT DETECTED AND THE REPORTED QUANTITATION LlMlT IS APPROXIMATE, 6) J- THE CQNSTlIUENT WAS DETECTED Mil r HE RESULT IS APPROXIMATE BASED ON DATA VALIDATION. 7) NS - NOT SAMPLED, 81 BASED ON THE MARCH 2015 GROUNDWATER MONITORING REPORT, &M-G7C AND CM-11D WERE ELIMINATED FROM GROUNDWATER SAMPLING, 91 BASED ON THE SEPTEMBER 2016 GROUNDWATER MONITORING REPORT, LM-QSB WAS ELIMINATED FROM GROUNDWATER SAMPLING, , 10\| BASED ON THE DECEMBER 2010 GROUNDWATER MONITORING REPORT AND SUBSEQUENT SCDHEC APPROVAL MW-14C WAS IMINATFD FROM GROUNDWATER SAMPt I NO, \| BM-10C WAS BUHlEEi UNDER A SOIL P\|L£ AMD NOT SAMPLED RING THE DECEMBER 2021 EVENT, ___ WHAKr — aaa«»ifliaar^ ------- NOTES! 1 j ALL RESULT? ARE IN UG/L. 2) J-THE RESULT \|S APPROXIMATE, 3) U - THE CONSTITUENT WAS NOT DETECTED. 4) UJ - THE CONSTITUENT WAS SOT DETECTED AND THE REPORTED QUANTITATION LIMIT \|S APPROXIMATE. 5l NA - NOT AVAILABLE. SC3PA ELECTRICAL SLBSTAT10S ¦RUCK ACCESS ROUTE CHARt OTJW STRFFT CHARl OTTF STREET INTERLOCKING-^ SHEET PILE -WALL TWC-STCftY wxovjcaa RE3DEVT1A1_ FORMER \| DETAIL \| GAS STATION (aPPWic. : WCATOwy ABOVE WCUSO CAELE T=EKlH THREE STTJRT BRICK 9UIL91K; LJCEN'S MARINE HICH YOLTMjE VOLTAGE APPROXIMATE LOCATION RETAIL BUILDING HSHE3. HAMPICH A MTEhi f»ELT SIHCLE—STCftT STUCCO CML 9UILDIWJ BURIED SEA «ALL COftvRETE L0A3INC REA FDRMEH ; ajto Booy srtcri lrffflWC_LOCATlDklJ WIMM6D NAPHTHAI.FNF DATE BENZENE 01.94 12/96 1Q/01 04,-05 02/06 09/06 03/07 09/07 06/08 02/09 12/09 oa/10 06/11 03/12 12/12 09/13 05/14 03/15 12/15 09/16 06/17 03/18 12/16 12/19 12/20 11/21 12/22 AGUAftfLtM WiAPfi ROAD SERVICE AREA WOT 04/05 02/06 09/06 03/07 09/07 0 02/09 12-09 0B/10 06/11 01/12 12/12 09/1J 05/14 03/15 12/15 09/16 06/17 01/16 12/18 12/19 1221 11/21 12/22 SOUTH CAROLINA AOUAftlUM I FORMED \| . RETAIL i > CAS I I STATION \| CHARLESTON Il22X)' ^TCWAYCENItH UBEW SQUARE 0BRA55 AMD TREES ARE'.; DOMINION ENERGY SOUTH CAROLINA, INC DECEMBER 2022 EVENT AND HISTORICAL BENZENE AND NAPHTHALENE ANALYTICAL RESULTS LOWER INTERMEDIATE SAND UNIT CALHOUN PARK AREA SITE CHARLESTON, SOUTH CAROLINA FILE KAsaE CPA1GWQ85 GRAPHIC SCALE APEX COMPANIES, 1 LC SOUTH CAROLINA STATE PORTS AUTHORITY CONTAINER STORAGE AREA Figure K-4: Historical Benzene and Naphthalene Analytical Results Lower Intermediate Sand Unit from 1994 to 2022 K-7 ------- Table K-3: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzetrre HaphthaSene 2,4-Dimethyl phenol Benzoi'ajpyrene Cairbazole Etfvyibenzeoe Toluene Total Xyterws 5 1.500 700 02 5 700 1.000 10,000 Wei! Date Sampled AM-03D 1/14/1994 200 U 10 U 10 U 10 U 10 U 200 U 200 U 253 U AM-03O 121/1998 5 U 9.6 U 9.60 U 0.29 U 4.3 U 5 U 5 U 5 U AM-03D 1 1/14)2000 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U AM-03D 1Di'12/2QQ1 5 U 10 U ID U D.2 U 10 IJ 5 U 5 U 5 U EM-01D US/I 994 10 u 10 U ID UJ 10 U 10 U to U 10 U 10 U BM-01D 12W1908 5 U 9 U 1D U 0.23 U 470 U 5 U 5 U 5 U BM-01D 11 M3i2Q0CI 5 U 10 U 1D U 10 U 10 U 5 U 5 U 5 U BM-03D 11/14.2000 30.DD0 9.500 37 J SCO U 45 J 3400 3.100 2500 U BM-030 1D1&2Q01 35,000 11.000 35 10 U 10 U 3S0Q 4200 2,800 BM-030 LOWER 124(2001 53,003 J 5.700 15 10 U to U 5.000 5JOO 3600 BM-030 UPPER 124/2001 45.000 J 7 800 25 10 U 10 U 5.300 5,900 3.800 E3M-030 4,f2&l2Q05 54,000 11 '000 10 U 10 U 10 U 3 700 0.500 4200 BM-030 9'132005 37,000 J 3200 ID UJ 10 U 10 U 2 300 6 600 4,630 BM-030 1MU2DD5 24,000 3.100 220 UJ 37 UJ 350 UJ 2.300 300 3200 BM030 1/9/2006 1,500 4.900 10 U 10 U 10 U 1 600 2,100 1 '320 BM-030 2,24.'2oae 13,000 7 500 36 10 U 10 U 2200 1 600 1.880 BM-030 6/130009 24,000 6 300 100 U 100 U too U 2100 2600 1.050 BM-03D #11/2000 37,000 9-500 10 U 10 u 10 U 3 300 3,100 1.790 BM030 121/2006 27,000 9.300 10 U 10 u to U 2400 5.S0G 3.3C0 BM-03D 1'13/2007 21,000 14.000 2,500 U 10 u 10 U 2.300 940 1,810 BM-030 9122D07 14,000 5:500 J 10 U 10 u 10 U 22-00 540 1,180 BM-030 30,000 15,000 ID U 10 u to U 3200 4.100 2100 BM-030 3K2/2009 35,00:• 13.000 220 UJ 37 UJ 350 UJ 4200 7.000 3,830 BM-030 12/17/2000 28,000 J 7JS00 61 J 13 UJ 51 UJ 3200 J 5200 3,000 BM-030 S,'2Qi20IO 34,000 11 000 68 10 U 10 IJ 4 400 4.630 3200 BM-03D arason 24,000 12.000 10 UJ 10 UJ 10 UJ <100 3,000 2400 BM-030 3,'14;2012 19,000 54,000 1D UJ 10 UJ 10 UJ 3 000 1.100 1 630 BM-03O 1242012 25,000 14 000 28 J 14 UJ 10 UJ 3200 960 1.610 BM-03D W16<20!3 25,000 3 230 15 UJ 10 UJ 14 UJ 3,400 340 J 1.443 BM-030 922^2014 30,000 10.000 35 UJ 10 UJ 10 J 3.600 320 J 1.300 J BM-03D 3/ 15:20 ¦ 5 27,500 13 330 10 U 10 U 10 U 2400 93 611 BM-030 1222:2015 26,300 10,300 10 U 10 U 10 U 3250 134 J 75d BM03D 9/2BGQ16 26200 J 9.640 J ID U 10 U 10 U 3470 J 146 J 4 39 J BM-030 &W2017 23,300' 11 £00 17 U 10 u 10 U 3.S00 132 J 759 BM-030 32220IS 21,400 10.000 ID U 10 u 10 u 2900 123 J 463 J BM-030 12/13^2018 24,500 14 300 1D U 10 u 10 U 3.960 110 J 610 J BM-030 12/12/2010 24,200 6 330 J NA 02 U 6 4070 55 U 434 BM-030 1222020 20,200 3.540 NA 0.19 U 7.7 3450 53.1 J 562 J BM03D 11 29/2021 2D.9D0 9.510 NA 0.2 U 0.1 3230 62.3 J 442 J EM-030 12&2D22 24.7DD TOSCO NA 0.2 U 0.2 34:0 97.8 J 624 J BM-030 DUP 11/14/2000 30,000 8.000 17 J 100 U 45 J 3.6CO 2703 2,530 U BM-030 DUP 124.200' 32,000 J 6.8Q0 13 10 U 10 U 5,500 6.000 3:500 BM-030 DUP 1'1&'2007 20,000 12000 10 U 10 U 10 IJ 2400 960 1 870 BM-03D DUP 3.'122007 15,000 4.000 J 10 U 10 U 10 U 2430 550 1260 K-8 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzefw Naphthalene 2,4-Dimethylpfce-no! Benzoi'ajipyTene Carbazole Etftyfbenzeflie Toluene Tcrtal Xylene's 5 1.5&G 700 02 5 700 1.0CH} 10,000 Well Date Sampled BM-03D DUP 6.r16/2DQi5 20.ODC' 1c ,000 10 U 10 U 10 U 2.900 3.700 2200 BM-03D DUP sasias 38,000 20.000 220 UJ 37 UJ 350 UJ 4500 7x00 4500 BM-03D DUP 12.'17<2009 20,000 J 7.DC0 54 UJ 13 UJ 51 UJ 4 .000 J 6.300 3600 BM-Q4D 11/13/2000 20,DD2 5.600 50 U 50 U 50 U 2 .5C0 U 2,500 U 2.500 U BM-04D ID-' 10=2001 20.000 7j00 24 to U 10 U 2,700 1 4D0 2.600 BM-Q40 4S23i2005 14.000 6.500 10 U 10 U 10 U 1700 500 5.340 BM-04D 2S3.-2QM 20.DCC 6.700 10 U 10 U 10 U 2.500 500 U 1.950 BM-04D Sm/2003 9.7DQ 2 500 5C U 50 U 50 U 1 400 1 000 U 1 OQO U BM-Q4D 3/1SQ0O7 13.000 7 500 10 U 10 U 10 U 1 900 250 1.350 BM-040 fl'1!S0D7 25,000 5.600 10 U 10 U 10 u 3.4:0 50Q U 2.060 BM-MD #17,2005 19.DD0 9 400 10 U 10 U 10 u 2,500 350 1243 BM-04D 2J25!20D>? 22.DD0 7,SCO 220 UJ 37 UJ 350 UJ 3,100 250 1.710 BM-04D 12/15.2000 14,000 6.700 10 U ¦0 U 10 U 2400 3D0 144D BM-04D &'1ft2010 10,000 £ .500 10 U 10 u 10 U 3.100 261 1.550 BM-04D &22.<2011 13,000 5.300 10 UJ to UJ 10 UJ S.700 130 910 BWaMD 3/13GDI2 11,000 5.K0 10 UJ to UJ 10 UJ 1 6C0 150 J 740 BM-04D 12C/2D-2 13,OK 4.600 1D UJ to UJ 10 UJ 1900 130 J 900 BM-04D W15G013 11,000 1 720 10 U 10 U 10 u 930 45 J 440 B^Z4D 5/222014 15,000 S.700 10 U 10 u 10 u 1.300 75 J 660 BM-04D 3MS/2Q15 11.400 7650 34 UJ 10 UJ 12 UJ 1J0E0 57 607 BM-04D 12.21.2015 2 43: 9.020 10 U 10 u 10 u 27 UJ 112 J 39 UJ BW04D 9,27.2016 20,200 3.310 10 U 10 u 10 u 1.7S0 tea j 775 J BM-04D 3.7,2017 16,700 9 730 10 U to u 10 u 2.410 .33a J 1,290 BM-34D 3/22CD15 12600 6 550 10 U 10 u 10 u 1,170 62 J 256 J BM-04D 12.1S.2018 7,130 4.210 10 U 10 u 10 u 644 20 J 194 J BM-04D 12/12/2019 9,450 3 620 NA 3.5 49 U 747 21 U 157 BM-040 122.2020 16,000 2.430 NA 2.2 k J 946 23.6 J 309 J 6M4MD 11 "292021 17,700 9.020 NA 0.72 5 U 920 25.3 J 271 BM-04D 12^2022 10,500 11 500 NA 0.70 5.3 V070 35.0 J 445 EM-05D 11.14.2000 220 25 2* 10 U 53 25 U 25 U 75 BM-05D 10/13/2001 14 10 U 10 U 10 U 52 5 U 5 U 25 BM-Q6C 10-11-2001 100 10 U 10 U 10 U 10 U 5 U 5 U 5 U 4.262035 62 10 U 10 U 10 U 10 U 5 U 5 U 5 U BM-06C 3/1&2007 65 10 U 10 U 10 U 10 U 33 5 U 357 BMO18C py.2007 25 10 U 10 U 10 U 10 U 5 U 5 U 5 U EVPZ"cC 6'1E,203E 2& 11 ID U 10 U 10 U 5 U 5 U 5 U BM-06C 3.2.2009 12 10 U 10 U 10 U 10 U 5 U 5 U 5 U EM-06C 1221.2009 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U EM-QOC Sa&CQIO 5 U 10 U 1D U 10 u 10 U 5 U 5 U 5 U BM-asc 6S2I2011 5 U 10 U 10 U 10 u 10 U 5 U 5 U 5 U BM-05C 3,' 14.20 '2 5 U 10 u ID U 10 u 10 u 5 U 5 U 5 U BM-OflC 12/4,2012 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U BM-06C 9'15.2013 5 U 10 u ID U 10 u 10 u 5 U 5 U 5 U K-9 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup G&a!: Benzeeie ftaphthaSene 24-Dimethyl phenol Benzotajpyiene Carbazole Eshyibenzene Toluene Total Xylenes 5 i.500 700 02 5 700 1,000 10,000 Well Date Sampled BM-07B !0'1&2001 5 U 10 U 10 U 10 u 10 U 5 U 5 U 5 U BM-07C 10/192001 760 13 10 U 10 u 10 U 130 170 130 BM-07C 4070005 130 15 R 10 UR 10 UR 10 UR 71 5 U 65 BM-37C 2010006 100 10 10 U 10 U 10 U 57 5 U 15 S M-07C &'H/2D06 67 10 u 10 U 10 U 10 U 52 5 U 3 BM-07C 3/19OD07 07 15 10 U 10 U 10 U 50 5 U 23 BM-07C af12"2007 37 10 IJ 10 U 10 u 10 U 41 5 U 7 BM-07C 6/170008 68 10 U 10 U 10 u 10 u 53 5 U 5 U BM-D7C 31/22000 45 11 10 U 10 u 10 u 23 5 U 6.5 BM-07C 12/17.2006 50 14 10 U 10 u 10 u 15 5 U 5 U EM-07C 5/200010 21 10 U 10 U 10 u 10 u 7 5 U 5 U BM-07C 6020011 17 10 U 10 U 10 u 10 u 5 U 5 U 5 U EM-07C 3®2012 5.B 10 u 10 U 10 u 10 u 5 U 5 U 5 U BM-07C 12WO012 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U BM4J7C rdi iaoot3 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U EM07C 5/200014 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U BM-07C 1/19O015 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U BM-O0B 1Q' 1 Z'2DQ 1 46.000 12,000 35 10 u 10 u 3.000 a.ooa 4,500 BM-03B 5/3/2005 24,000 12,000 10 U 10 u 10 u 3.000 3.700 2500 BM-05S anarans 13,ODD 2,700 22 10 u to u 640 580 {.060 BM-OSB 11&2DQ5 14,OK1 4 300 10 U 10 u 10 u fJDOQ 1.300 * 550 EM-OEB 1 <9/2006 9,500 6,900 26 10 u 10 u 1 oca 1,800 ¦5 200 EM-OBB 2240D36 9.600 9.800 72 10 u 10 u 590 1.400 1,660 EM-058 firi4fflDB6 22,ODD 5,500 34 10 u 10 u 1.200 990 6E0 BM-OSB 9/3/2006 10,003 7.SG0 10 U 10 u 10 u 2JMQ 1.930 1,810 BM-OSB 11 ¦¦30.200S 400 10 U 10 U 10 u 10 u 46 110 250 BM-OSB 5/190007 6,100 e.coo 10 U 10 u 10 u €40 800 1.170 BM-OBB 9,'U2007 6,000 2:900 10 U 10 u 10 u 660 920 560 EM-0-E8 6/17,-2000 23,000 9.400 10 U 10 u 10 u 1.800 2930 2433 BM-088 2250009 10,000 9.900 220 UJ 37 UJ 350 UJ 2300 2900 2-330 BM-OSB 12/15.2009 14,002' 6.330 10 U 10 u 10 u 1.930 2000 t„920 BMOSB 8000010 20,003 3.400 10 U 10 u 10 u 2100 1,700 2000 BM-OSB 6020011 15,003 5,600 23 J 10 UJ 10 UJ 1.900 1 700 1450 BM-OSB 3fli2D12 16,003 3.800 10 UJ 10 UJ 10 UJ 1 SCO 1 300 1.380 BM-OSB t2ftOQ12 15,003 4.400 16 J 10 UJ 10 UJ 1.600 1.100 1.180 BM-OSB 0(172013 7,703 1 700 10 U 10 u 10 u 1.100 620 660 BM-OSB 5000014 2,603 35 10 U 10 u 10 u 450 5:90 230 BM-OSB 3/17/2015 1.180 714 10 U 10 u 10 u 345 104 190 EM-SC 1CL'12/2001 10,000 2,800 10 U 10 u 10 u 1.500 520 720 BM-03C s-a;2005 4,600 750 J 10 U 10 u 10 u ESQ 400 470 BM-08C 9' 13,2 Dj5 38 10 U 10 IJ 10 u 10 u 5 U 5 U 5 U BM-OSC 11BOD05 8 10 U 10 U 10 u 10 u 5 U 5 U 5 U BM-OSC 1.9-2006 2,100 ?ao 10 U 10 u 10 u 330 44 91 BM-O&C 2040006 130 27 10 u 10 u 10 u 120 5 U 61 K-10 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benze>e Naphthalene Z4--Dimethylp-?no! Benzo(a)pyrene Carbazole Ethyflbenzerve Toluene Total Xylenes 5 1.5W 700 0_? 5 700 1.0&D 10,000 Well Date Sampled EM-08C 6/14,2006 16 ia u 10 U 10 u 10 U 5 U 5 U o BM-OSC 9V3/2Q06 7 ia if 10 U 10 u 10 U 5 U 5 U 5 U BMtfBC 11/30/2006 7 10 u ID U 10 u 50 U 5 U 5 U g U BM-OSC 3f19/2Q07 5 U 10 u 10 U 10 u 10 U g U 5 U 5 U BM-OSC W11/3Q07 5 U 1G U 10 U 10 Q 10 U 5 U 5 U 5 U EM-G0C sn.QQoa 5 U 10 U 10 U 10 u 10 U 5 U 5 U g U em-oqc 2G5C2MB 5 U 10 U 10 U 10 u 10 U 5 U g U g U BNW8C 12/15/2009 5 U 10 u 10 u 10 u 10 U 5 U g U g U BM-03C 3/6/20 12 5 U 10 u 10 u 1D U 10 u 5 U 5 U 5 U BM-OSC 9/17CD13 5 U 10 u 10 u 10 li 10 u £ U 5 U 5 U BNHKC CUP 5,i"i2005 4,800 1 6X3 J 10 u 10 U 10 u 650 4jO 470 BM-10B ID'1221X11 38 10 U 10 u 10 U 50 U 5 U 5 U 5 U BM-1QB 4/27/2005 19 10 U 10 u 10 U 10 U g U 5 U g U BM-?0B 2/24,(2033 5 U 10 U 10 u 10 U 10 u 5 U g U 5 U BM-1QB 3/10/2OB7 5 U 10 U 10 u 10 u 10 u 5 U 5 U 5 U BM-liOB 9i 22007 5 U 10 u 10 u 10 u 10 u g IJ g U 5 U BM-1QB fflisaooa 5 10 u 10 u 10 u 10 u 5 U 5 U 6 U EM-^oe 3/2/2006 5 U 10 u 10 u 10 u 10 u 5 U g U g U BM-10B 1221.2006 5 U 10 u 10 u 10 u 10 u 5 U 5 U g U BM-1C6 B0Q/2Q1O 5 U 10 u 10 U 10 u 10 u g U g U g U EM-10B 023/2011 5 U 10 u 10 U 10 u ia u g U g U 5 U BM-10B 3/8/2012 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EM-1QB 12/42012 5 U 10 u 10 u 10 u 10 u g U 5 U g U BM-10B a'ia2Q13 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EM-ice DUP 124,2012 5 U 10 u 10 u 10 LI ia u 5 U 5 U 5 U BM-1QB DUP ft''1SE013 5 U ia u 10 u to u 10 u 5 U 5 U 5 U BM-IOC 10.122001 14.DOO 1,500 10 u 10 u 10 u 50Q 260 260 BM-IOC 4,27,"2005 20,000 2200 10 u 10 u 10 u 12C0 250 U 700 EM-IOC 9/14,2005 2t,ooo ¦sea 760 250 U 280 BM-1QC 11/62035 9,800 200 10 u 10 u 10 u 300 100 U 330 em-»oc 1/9/2006 11,000 310 J 10 u 10 u 10 u 250 U 250 U 25Q U EM-IOC 2'24/2QQ6 5,600 ?&0 J 10 u 10 u 10 u 270 16 263 em-ioc & 14,2008 300 110 10 u 10 u 10 u 170 12 67 BM-IOC ari i/2oa& 46 130 E 10 u 10 u to u 16 5 U 16 EM-IOC 11.202006 16 10 u 10 u 10 u to u 5 U 5 U 5 U BM-IOC 3/'1&2007 5.6 10 u 10 u 10 Li 10 u e 5 U 5 U BM-IOC 9/12/2Q07 5 U 10 u 10 u 10 u 10 u g u 5 U 5 U BM-IOC 6/16,2008 5 U 10 Lf 10 u 10 u 10 u g u g U g U BM-JGC 3/22009 5 U 10 u 10 u 10 u 10 u 5 U 5 U g U EM-IOC 1221.12009 5 U 10 u 10 u 10 u 10 u g u g U g U BM-^OC 3.-18.2012 9.1 10 u 10 u 10 u 10 u g u 5 U g U BM-IOC 9/1620!3 3,700 39a 10 u 10 u 10 u 4?a 81 205 BM-IOC 5,222014 7,TOD 830 10 u 10 u to u &sa 200 J 320 J K-ll ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzew Haiphthafefie 2^t-DimetfryJ phenol Benzoi'a)pyTene Carls scale Etfty! benzene Toluene Total Xylenes 5 1,500 700 02 5 700 f.OOG 10,000 WelS Date Sampled BM-'OC 3/18/2015 6.510 936 10 U 10 U io u 763 153 EM-'CC 1Z.'ia.2Q15 9,890 1220 10 U 10 U 10 u 719 100 321 BM-IOC SV26/2D16 7,370 155 10 U 10 U 10 u 349 49 J m j BM-IOC 0-T-'2d 17 155 10 U 10 U 10 U 10 u 5 U 5 U 5 U BM-IOC 3/22/2018 5.230 411 10 U 10 U 10 u 307 30 J 769 J EM-'CC 12/13/2016 10,300 933 10 U 10 U 10 u 782 55 J 456 J BM-IOC 12/12/2019 4,960 403 NA 02 UJ 5 UJ 572 10.3 J 2E3 BM-IOC 12/20020 5.350 292 IMA D2 U 5 U 694 13.3 J 347 BM-'QC 12BQ022 2,300 667 NA D2 U 5 U 461 5 UJ 256 BM-IOC DUP 4/272005 20,000 2,000 10 U 10 U 10 u 1.200 250 U 670 BM-IOC DUP 9/11Q0O3 43 95 10 U 10 U 10 u 10 5 U 17 EM-MB 6/15/2006 5 U 10 U 10 U 10 U 10 u 5 U 5 U 5 U BM-11C 6/15-2DD6 9 10 U 10 U 10 U 10 u 5 U 5 U 5 U CM-01D 1/10/1994 15,000 67 20 U 20 U 20 U 770 500 U 420 J CM-06D 11/13112000 5 U 10 U 10 U 10 U 10 u 34 5 U 13 CM-06D 1024Q001 5 U 10 u 10 U 10 U 10 u 13 5 U 19 CM-06D 4/26/2005 5 U 10 u 10 U 10 U 10 u 5 U 5 U 5 U CM-06D 2/22/2009 5 U 10 u 10 U 10 U 10 u 5 U 5- U 5 U CM-06D 3/1&2KJ7 5 U 10 u 10 U 10 U 10 u 5 U 5 U 5 U CM-07C 11/1flG!D00 5 U 10 UJ 10 UJ 10 UJ 10 UJ 5 U 5 U 5 U CM-07D 10H 12001 5 U 10 u 10 U 10 U so u 5 U 5 U 5 U CM^Q7D 4,'26/2005 5 U 10 u 1D U 10 u 10 u 5 U 5 U 5- U CM-07D 2'23/2006 5 U 10 u 1D U 10 u 10 u 5 U 5 U 5 U CM-07Q J-W2Z07 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U CM-11D 11/1320D0 12.000 10 u 10 U 10 u 15 500 U 500 U 500 U CM-11D 10'17200: 5,600 09 1D U 10 u 10 u 13 5 13 CM-11D 4292005 4S 10 u 10 U 10 u 10 u 5 U 5 U 5 U CM-11C ^'14;20j5 36 10 u 10 U 10 u 10 u 5 U 5- U 5 U CM-11C 12:102005 3D 10 u 10 U 10 u 10 u 5 U 5 U 5 U CM-11D 2E2/2D0B 45 10 u 10 U 10 u 10 u 5 U 5 U 5 U CM-11D 4/2&2Q06 4» 10 u 10 U 10 u 10 u 5 U 5 U 5 U CM-11D ffl12ffl006 353 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-110 emoooe 360 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-11D 11/30/2006 3M 10 u 10 u 10 u 10 u 5 U 5 U 6 CM-11D 3/1&2007 93 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-11D 9/122ED7 2.700 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-11D 6/1B/2Q08 19 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-11D 2'26,l20O9 5J 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-11D 12.'152OD0 7.0 10 u 10 u 10 u 10 u 5 U 5 U 5 U CM-11C £'20/2010 92 10 u 10 u 10 u 10 u 5 U 5 U 5 U K-12 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzene Ifaphthatanse 2,4-Dimethyl phenol Benzo(a)pyTene Carbazole Etitiyfbenzesve Toluene Total Xyt«es 5 1t500 700 0.2 5 700 1.000 10,000 Well Date Sampled CM-11D 6/222011 5 U to U 10 U to u to U 5 U 5 U 5 U CM-11C 3/14,20'2 54 10 U 10 U 10 u 10 U 5 U 5 U 5 U CM-11D 124/2012 5 U 10 U 10 u 10 u 50 U 5 U 5 U 5 U CM-11D 0/1.5/2013 5 U 10 U 10 u 10 II 10 U 5 U 5 U 5 U CM-11Q 5(2010014 5 U 10 U 10 u 10 u 10 U 5 LI 5 U 5 U GM-11D 3M8QQi£ 5 U 10 li 10 u 10 u 10 U 5 U 5 U 5 U DM-01D VIW19W 10 U 10 U 10 U 10 u 10 U 10 U 10 U 10 U DM-01D 12W1SSB 5 U 9.5 U S.5 U 0.23 U 4.30 U 5 U 5 U 5 U DM-01D 11/14/ZDDD 5 U 10 U 10 u 10 U 10 U 5 U 5 U 5 U DM-Q1D ID/252001 5 U 10 U 10 U 10 U 10 U 5 U 5 U rn a DM-02D 1/7/1994 10 U 10 U 1D UJ 10 u 10 U to U to U to u DM-Q2C 12W19BB 5 U 10 If 10 U 0.31 U 5.20 U 5 U 5 Lf 5 U ~M-Q2D 10/24/2001 5 U 10 U 10 u 10 U 10 U 5 U 5 U 5 U 0RW-D2 123/1990 4,600 2.500 550 0.30 U 57 580 3.000 1.400 DRW-C2 11/16/2000 9200 4 iQQ J 10 UJ 10 UJ 74 J 1 500 6 400 2.180 EB1D1SQ1 1Q' 18/200r 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U EB102301 1 Q23/200' 5 U 10 U 10 U 10 U 50 U 5 U 5 U 5 U EE 102431 10/24/2001 5 U 10 U 10 U 10 U SO U 5 U 5 U £ U EB111430 11 ¦14:2000 5 U to U 10 U 10 U 10 U 5 U 5 U 5 U EB12050I 125/2001 5 U 10 U 10 u 10 u 10 U 5 U 6 5 U BB030905 3-9/2005 5 U 10 U 10 u 10 u 10 U 5 U 5 U 5 U EBQ42S06 4Q&2005 5 U 10 li 10 u 10 u 10 U 5 U £ U 5 U EB050305 5/3-2005 5 U 17 10 u 10 u 10 U 5 U 5 U 5 U EBQ913C6 ffl13,20G5 5 U 10 U 10 u 10 u 10 U 5 U 5 U 5 U EBO10906 1/9/2006 5 U 10 U 10 u 10 u 10 U 5 U 5 U 5 U EEC2220? 2/22GD03 5 U tQ U 10 u 10 u 10 u 5 U 5 U 5 U EB0613C6 &f13J2C06 5 U 10 U 10 u 10 u 10 u 5 U 5 U 5 U EBQ315Q7 3/15/2007 5 U 10 U 10 U 10 u 10 U £ U 5 U 5 U EB032107 3,2 1/2007 5 U 10 U 10 u 10 u 10 U 5 U 5 U 5 U E306DK7 9/9/2007 5 U 10 U 10 U 10 u 10 u £ U 5 U 5 U EB06170S 817/2000 5 U 10 U 10 u 10 u ia u 5 U 5 U 5 U EBQ225G9 2/2S2009 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EB1216DB 12-16-2009 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EB0319'I 5; 19/20'0 5 U 10 u 10 u 10 u m u 5 U 5 U 5 U EB0620T T 6,2i020lt 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EB030512 3/52012 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EB112012 11/29.2012 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 LI E3O017H3 9/17/2013 5 U 10 u 10 u 10 u 10 u £ U £¦ U £ U EB0520J4 500/2)014 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U 003172015 3,f17/2D15 15 10 u 10 u 10 u to u 5 U 5 (J £ U EE12182015 12-'18.2015 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EBG926-C ¦5.2.5.2016 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U EBQ6062017 6-1-2017 5 U 10 u 10 u 10 U 10 u 5 U 5 U 5 U K-13 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup GoaJ: Benzene fephtha&ene Z4-Dimethylphe-nol Benzoi'a)pyTene Carbazole Etfrytbeazesre Toiuene Total Xyt«>es 5 1,500 700 0.2 5 700 1,000 10.000 Wel« Date Sampled EBQ3221S aC2ZCD1S 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U EB12131S 12/13/2018 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U EB12113019 12''11/2019 5 U 11 u NA 0.2 UJ 5 UJ 5 U 5 U 5 U EB12D12G 12/1G02Q 5 U 9.9 U NA D.2 U 5 U 5 U 5 IJ 5 U EE 11292* 11/20/2021 5 U 10.0 U NA 0.21 U 5.2 U 5 U 5 U 5 U EB120622 (2/5/2022 5 U 9.7 U NA 0.19 U 4.9 U 5 U 5 U 5 U EBMW-06 11/14/2DD0 29 10 U ID U 10 U 10 U 5 U 5 U 5- U EBMW-DS 1 D'23"2DD 1 25 10 U ID U 10 U 10 U 5 U 5 U § U EBMW-07 11/14/2000 12 10 U 1D U 10 U 10 U 5 U 5 U 5 U EEMrt'-07 10.212001 35 10 U 10 U 10 U ID U 5 U 5 U 5 U LM-D3D 1/18/1 £©4 10 U to U 1D U 10 U 10 U 10 U 10 U 10 U LM-030 11/17/1998 5 U 10 U 10 U 5 U 5 U 5 U LM-030 12/2/19SS 5 U 10 u 0.90 U 0.20 U 5 U 5 U 5 U 5 U !_M^S3D 3/10/1999 5 U 5 LI 5 U 5 U 5 U 5 U 5 U 5 U LM03D 11/15.2000 5 U 10 U ID U 10 U 10 U 5 U 5 U 5 U LM-030 1 Q'24/2001 5 U 10 U 1D U 10 U 10 U 5 U 5 U 5 U LM-OSC 11/16.20DO 5 U 10 UJ 1D UJ 10 UJ 10 UJ 5 U 5 U 7 LM-OSC 10/10/2001 25 U 33 10 U 10 U 10 U 25 IJ 25 U 25 U LM-DSC LOWER 12S2DQT 6 UJ 19 1D U to U 10 U 5 UJ 5 UJ 5 UJ LM-OSC UPPER 12/3/2001 7 UJ 67 1D U 10 U 10 U a UJ 5 UJ 3 J LM-OSC 4(26/200® 5 U 10 U ID U 10 U 10 U 5 U 5 U 5 U LM-OSC 3230009 5 U 10 U 1D U 10 u 10 U 5 U 5 U 5 U LM-OSC 3/16ffl0Q7 5 U 10 U 1D U 10 u 10 u 5 U 5 U 5 U LMH8C 2Q6'2009 5 U 10 U 1D U 10 u 10 u 5 U 6 U 5 U LM-05C 1216/20® 5 U 10 U 10 U 10 u 10 u a U 5 U 5 U LM-DSC S^^DSO 5 U 10 U 1D U 10 u 10 u o U 5 U 5 U LM-OSC 6/20V2D11 5 U 10 U 1D U 10 u 10 u 5 U 5 U 5 U LM-DSC i113/20 "2 5 U 10 U ID U 10 u 10 u 5 U 5 U 5 U LMGSC 11/30:2012 5 U 10 U ID U 10 u 10 u 5 U 5 U 5 U LM-DSC: 5'?a«)13 5 U 10 U 10 U 10 u 10 u 5 U 5 U 5 U LM-OSC 5/21/2054 5 U 10 U 10 u 10 u 10 u 5 U 5 U 5 U UVWJSC 3/1E/2Q15 5 U 10 u 1D U 10 u 10 u a U 5 U 5 U LM-DSC 12/21/2015 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U LM-Q8C W27.'2Df6 5 U 10 u ID U 10 u 10 u 5 U 5 U 5 U LM-OBC 5/3.2017 5 U 10 u ID U 10 u 10 u 5 U 5 U 5 U LM-OSC i^QOIS 5 U 10 u ID U 10 u 10 u 5 U 5 U 5 U LM-OSC 12/13/2018 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U LM-Q8C 12/U2Q2D 5 U 0.9 U NA D.2 U 5 U 5 U 5 U 5 U LM-OSC 12/7/2022 5 U 9.a u NA D.2 U 4.9 U 5 U 5 U 5 U LM-05C DUP SOS201Q 5 U 10 u 10 U ?o u 10 u 5 U 5 U 5 U LM-09E 1'10/1&39 1,900 5.1C0 47 5 U 43 1,53] SO U 1,100 K-14 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goaf: Benzeve naphthalene 2,4-Dimetfiyl phenol Benzoi'a)pyrene Carbazole Efoyibenzeive Toluene Total Xylenes 5 1,500 700 02 5 700 1,000 10,000 Wei? Date Sampled LM-09B 11-10.-2OOD 2,000 710 J 10 UJ 10 UJ 71 J 1,100 100 u 6®) LM-G9B 10/222001 3.000 3,200 10 U 10 U 46 1.700 22 750 LW-D9B 42&2DQ5 1,003 2.2CC 61 10 U £2 SCO 50 U 260 lm-o§e ft'142005 80 1200 26 10 U 33 79 51 166 LM430B 11/&2005 S3 550 13 10 U 130 130 6 137 UM-O&E 1/102£06 36 J 420 23 10 U 39 50 6 J 40 J LM-09E 2/23,12006 56 110 10 U 10 U 41 120 5 U 36 LM-DdE &''14<2D06 25 77 10 U 10 U 34 260 12 70 LM-09B £' 13,2056 56 10 U 12 R 10 U 80 150 17 133 LM-09E !2'1,<2M6 100 5 400 10 U 10 U 27 <50 10 40 lM-OSE 3/160007 5 U 33 10 U 10 U 16 13 5 U 5- U LM-09E Bte/2007 5 U 10 U ID U 10 U to U 5 U 5 U 5 U LM-D0B 6f 1910003 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U LM-096 2260009 5,6 81 10 U 10 u 10 U 10 5 U 0 LM-05B 12/17/2009 5.0 U 79 10 U 10 u 10 U 15 5 U 5 U LM-09E S,23"2010 53 110 1D U 10 u 10 U 10 5 U 3 LM-02B &2Q2011 14 230 10 UJ 10 u 10 UJ 20 5 U 15 LM-06B 1' 112012 11 170 io u 10 u 10 U 20 5 U 7.3 JJA0E6 11.30.2012 5 U 42 io u 10 u 10 U 5 U 5 U 5 U LWJSB »1ffl2Q13 25 360 10 u 10 u 10 IJ 9 5 U 7 LVK38B 5E1Q0J4 5 U 12 10 u 10 u 10 U 5 U 5 U 5 U LM-096 3r1&20!5 5 U 10 U 10 u 10 u 10 U 6 U 5 U 5 U LM-O0C 1221;2015 5 U 17 1D U 10 u 10 U 5 U 5 U 5 U LM-09B ft<27QQ16 5 U 15 ID U 10 u 10 U 5 U 5 U 5 U LM-10E l'1Gr1999 5 U 10 5 U 5 U 5 U 43 5 U 22 . LM-'CS 1 022200 1 5 U 10 U IO u 10 U 110 5 U 43 LM-tGB 4/2612005 5 U 10 U 10 u 10 u 10 U 66 5 U 33 LM-liGB 2/23.'23:€ 5 U 10 U 10 u 10 u 10 U 46 5 U 24 11A-10B 3/1&2Q07 5 U 10 U 10 u 10 u 10 u 52 5 U 25 LM-10D 31/9/2005 5 U 10 U 10 u 10 u 10 u 5 U 5 U 5 U LM-1QO 3/142035 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U LM-1QD 12/162005 5 U 10 u ID U 10 u 10 u 5 U 5 U 6 U LM-1ZD 2/21200?' 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U LM-1QD 6/14,2036 5 U 10 u ID U 10 u 10 u 5 U 5 U 5 U LM-10D 3.1&2007 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U MM-01E 1/1S/19&4 3,630 890 1SD 1J 31 250 560 290 MM-D1B 12/3/10® *6,000 2,600 9.00 U 3 610 1,500 620 T ,600 MM-Q1B 11.' 1&2000 11,000 11 000 430 50 U 320 rooo 2,600 1.680 MM-01B 1Q/17.2001 10,000 530 10 U 10 u 10 U 1 500 1.700 1.700 MM-01B 12/42001 10,000 J e.ico 190 10 u 190 2.100 2900 2,500 MM-G1D ', 17,' 19£4 4,500 30 10 U 10 u 10 u 1.000 u 1 ODO U 1,000 U MM-01D 120/1008 12,003 too 10 U 0.30 U 5 U 1200 19 350 MM-01D 10.'172001 12.001' 67 10 U 10 u 10 U 1 5C0 ICO U 240 K-15 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzefve Naphthalene 2,4-Oime	------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleaniip Goal: Benzene N-aphthalefle 24-Dimethylplieno^ Benzoi'ajpyrene Carbazole Bthyflwnzene Toluene Toial Xylenes 5 1.5&G 700 0.2 5 700 1,000 10,000 Well Date Sampled MM-Q2D 9/27,2016 23,400 4.570 10 U 10 U 10 u 93 J 42 78 MM-02D 6/772017 17,300 5,060 10 U 10 u 10 U 58 U 73 J EO J MM-Q2D 3222018 26,000 5.060 10 U 10 u 10 U 123 J 53 U 73 U MM-02D 12/13/2016 30,1 DO 5.520 10 U 10 u 10 U 76 J 45 U 140 J MM-Q2D 12/12/2016 24,203 3430 MA 0.2 UJ 5 UJ 52 U as U 73 U MM-Q2D 12/2I2D20 22,103 t.150 MA 02 U 4.9 U 67.3 J 45 UJ 85.9 J MM-02D 11'30.2021 20,203 3.950 MA 0.2 U 5 U 43.5 J 45 UJ 78 UJ MM-02D 127/2022 15,800 4.590 MA 0.19 U 4.8 U 48.2 J 45 UJ 78 UJ MM-Q2D DUP 6/21/2011 23,003 J 4.000 10 UJ 10 u 10 UJ 33 U J 2i3 UJ 21 U MM-02D DUP 3/15/2012 11,003 2 300 10 U 10 U 10 U 17 UJ 13 UJ 43 J MM-Q2D DUP 5/222014 27,003 3,700 10 U 10 u 10 U 73 J 38 JS 120 J\| MM-Q2D DUP 3/192015 24,903 -£.650 10 U 10 U 10 U 58 to £2 MM-Q2D DUP 1222=2015 20,003 3.360 10 U 10 U 10 U 63 J 21 UJ 126 J MM-12B 11/15/2000 1,803 10 U 10 U 10 U 10 U 65 50 U 50 U MM-12B 10.102001 753 !50 10 U 10 u 10 U 44 10 U 51 MM-12B 4/2WZJQ5 630 330 R 10 UR 10 UR 10 UR 50 U 50 U 50 U MM-12B 2/24,0006 620 310 10 U 10 U 10 U 55 5 U 41 MM-12B ¦a'i2/?:-:r] 603 310 10 UR 10 U 10 U 62 5 U 42 MM-12B 315/2007 360 440 10 U 10 u 10 U 50 U 50 U 50 U rvW»f-12E 9'10.2037 503 420 10 U 10 u 10 U 47 5 U 23 MM-12B 6/18/2008 640 340 10 U 10 u 10 U 51 5 UJ 27 MM-12B 3/3/2006 683 340 10 U 10 u 10 U 67 5 U 41 MM-12B 12/17.2009 760 39 10 U 10 u 10 U 51 5 UJ 26 MM-12B 3/142010 530 25 10 U so u 10 u 54 5 U 27 MM-12B 6/20/2011 200 33 10 U 10 u 10 u 47 5 U 25 MM-12B 3/14/2012 70 14 10 u 10 u 10 u 40 5 U 21 MM-12B 11 >29/2012 123 13 10 u 10 u 10 u 52 5 U 21 MM-12B 3/12/2013 490 36 10 u 10 u 10 u 5c 5 U 25 MM-12B 5/22/2014 500 23 10 u 10 u 10 U 57 5 U 47 MM-12E 3/17/2015 491 11 10 u 10 u 10 u 52 5 U 18 MM-12E 12.18.-2015 392 10 U 10 u 10 u 10 u 56 5 U 14 MM-12B 9,262016 339 10 U 10 u 10 u 10 u 63 5 U 10 MM-12B §'7.2017 447 10 U 10 u 10 u 10 u 67 5 U 13 MM-12B 1222018 507 10 U 10 u 10 u 10 U 53 5 U 10 J MM-12B 12/12/2018 160 10 U 10 u 10 u 10 U 60 5 U 7 MM-12B 12.11.2019 392 J 11 U MA 02 UJ 5 UJ 87.3 J 5 UJ 0.8 J MM-12E 12/1/2020 '502 9.0 U MA 0.19 U 4.3 U 50 5 U 5.8 MM-12B 11-202021 946 11 U MA 0 .22 U 5.5 U 39.4 5 U 5 U MM-12B 12612022 122 10 U MA 0.2 U 5 U 30.6 5 U 5 U MM-13B 10222001 26 10 U 10 u 10 U 10 U 5 U 5 U 19 MM-13C 10.222001 56,003 4.600 35 10 U 10 U 3.700 890 1870 MM-13C 125/203 43,003 J 5.500 47 10 u 10 6,000 1,600 3.603 MM-13C 5.22005 33,003 7300 10 U 10 u 10 U 2 700 500 U 1:340 K-17 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goa5: Benzene fiiaphthaJesw 2,4-Dimethylpftenol Benzoi'a)pyrene Carbazole Ethylbenze^te Toluene Total Xylenes 5 1.50-0 700 Q2 5 700 1,000 10.000 Well Date Sampied MM-13C 2222006 34,000 J 4,400 J 10 U 10 U 14 3,100 J 550 1.550 J MM-13C 9/12/2006 45,ODD 4.100 50 U 50 U 50 U 3,800 Z50O U 2,500 U MM-13C 1'162007 56,000 4.800 10 U 10 U 10 U 3,100 470 5,520 MM-13C 9"1Q2DQ7 8,600 4.100 14 J 10 U 10 U 2 900 870 3200 MM-13C e/ra^DQB 36,000 3.600 10 U 10 U 10 U 2,500 19 UJ 830 MM-13C 3/312006 39.DDC- 5500 220 UJ 37 UJ 350 UJ 3.100 500 U 1300 MM-13C 12?' 15-2009 29,000 3,500 10 U 10 U 10 U 2.600 350 1,060 MM-13C 5,23/2010 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U MM-13C 60110011 31,000 4.300 1B J 10 U 10 UJ 2.900 25 UJ 750 WIM-13C £15(2012 16,000 3,300 120 10 U 10 U 1,100 170 J 439 MM-13C 11.29,2012 23,000 4.500 10 UJ 10 UJ 10 UJ 4.-000 330 1.170 MM-13C ana20i3 39,000 3,300 10 UJ 10 UJ 12 J 32-00 310 1.040 MM-13C 5/222014 34,000 3,900 10 U 10 u 10 U 3.200 330 J ijooa j MM-13C 3/19,2015 1,540 3 430 10 U 10 u 10 U 146 13 52 MM-13C 12.222015 33,000 3.500 10 U 10 u 10 U 3,140 270 J 1070 MM-13C 927,2016 25,500 3.610 10 U 10 u 10 U 2,650 203 J 755 J MM-13C 6,720 17 16,300 4,5fi] 10 U 10 u 10 u 1.860 m J 678 J MM-13C 1222015 26,400 2.760 10 U 10 u 10 u 2.7M m j 704 J MM-13C 12/12/201B 29,000 4.570 10 U 10 u 10 u 3.30Q 234 J 924 J MM-13C 12/11.-2019 28,400 J 2.430 NA 02 U 7.1 2.750 J m j 697 J MM-13C 12/1/2020 17,900 763 NA 02 U 7.3 1,770 136 J 502 J MM-13C 11.202021 22,400 2,990 NA- 02 U 6.9 2410 177 J 640 J MM-13C 12/7/2022 17,300 32C0 NA 0.2 U 4.9 U 1.870 110 J 442 J MM-13D 10/ 13/2001 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U MM-13D 5-2/2005 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U MM-13D 2222DQ6 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U MM-13D 3/16(2007 5 U 10 U 10 U 10 U 10 u 5 U 5 U 5 U MM-14C 10-17-2001 5,400 6.700 220 10 u ISO 660 33 550 MM-14C 4/28/2035 18 33 10 U 10 u 10 u 12 5 U 5 U MW-14C 2/27/2000 6 24 10 U 10 u 10 u 7 5 U g U WIM-14C 9r13,2DQ6 10 10 U 10 UR 10 u 10 u 10 5 U 6 U MM-14C 2,'162007 5 27 10 U 10 u 10 u 5 5 U 5 U MM-14C 9/100007 6 33 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 6/192008 45 30 10 U 10 u 10 u a u 5 U 5 U MM-14G 2/262009 5 U 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 12' 17-2009 7 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 5/19.2010 52 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 6.23,2011 130 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 3/152012 96 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 11/29.2012 300 10 U 10 u 10 u 10 u 5 U 5 U 6 U MM-14C 2/10/2013 46 10 U 1D U 10 u 10 u 5 U 5 U 5 U MM-14C 5,21,2014 7.5 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 3/17/2015 5 U 10 U 10 U 10 u 10 u 5 U 5 U 5 U MM-14C 12MG.-2015 5 U 10 u 10 u 10 u 10 u 5 U a U 0 U MM-14C '3262016 5 U 10 u 1D U 10 u 10 u 5 U 5 U 5 U K-18 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup GoaS: Benzene Itaphthatese 2,4-0ime ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzene Naphthalene 2,4-Dimethyl phenol Benzo{a)pyrene Carbazole Ethylberizene Toluene Total Xylenes 5 1,500 700 0.2 5 700 1,000 10,000 Well Date Sampled MM-16D 12.7/2022 5 U 10 U NA 0.2 U 5 U 5 U 5 U 5 U MM-16D DUP 9/2S/20 IB 40 10 u 94 10 U 10 U 5 U 5 U 18 MM-16D DUP 6/6/2017 28 10 u 69 10 U 10 U 5 U 5 U 17 MM-16D DUP 3/21/2018 16 10 U 27 10 U 10 U 5 U 5 U 11 MM-16D DUP 12/13/2018 15 10 u 30 10 U 10 U 5 U 5 U 11 MM-16D DUP 12/12/2019 5 UJ 11 u MA 02 UJ 5 UJ 5 UJ 5 UJ 6 .4 J MM-16D DUP 12/2/2020 8.8 9.9 U NA 0.2 UJ 5 U 5 U 5 U 7.8 MM-16D DUP 11/30/2021 5.0 U 10.0 U NA 0.2 U 5 U 5 U 5 U 5.0 U MM-16D DUP 12/7/2022 5 U 9.7 U NA 0.19 U 4.8 U 5 U 5 U 5 U NM-06D 11/15/2000 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U NM-06D 10/24/2001 5 U 10 U 1D U 10 U 10 U 5 U 5 U 5 U MM-06D 4/27/20D5 5 U 10 U 1D U 10 U 10 U 5 U 5 U 5 U NM-Q6D 2/23/2006 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U NM-06D 3/16/2007 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U NM-06D 2/2)6/2009 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U NM-06D 12/16/2009 5 U 10 u 10 U 10 U 10 U 5 U 5 U 5 U NM-G6D 8/19/2010 5 U ID U 10 U 10 U 10 U 5 U 5 U 5 U NM-06D 6/20/2011 5 U 10 U 1D U 10 u 10 U 5 U 5 U 5 U NM-08D 3/13/2012 5 U 10 U 10 U 10 u 10 U 5 U 5 U 5 U NM-06D 11/30/2012 5 U 10 u 10 U 10 u 10 U 5 U 5 U 5 U NM-06D 9/17/2013 5 U 10 u 10 IJ 10 u 10 U 5 U 5 U 5 U NM-Q6D 5/21/2014 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U NM-Q6D 3/18/2015 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U NM-06D 12/21/2015 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U NM-06D 9/27/2016 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U NM-06D 6/B/2017 5 U 10 u 1D U 10 u 10 u 5 U 5 U 5 U NM-06D 3/22/2018 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U NM-06D 12/13/2018 5 U 10 u 10 U 10 u 10 u 5 U 5 U 5 U NM-06D 12/1/2020 5 U 10 u NA 0.2 U 5 U 5 U 5 U 5 U NM-06D 12/7/2022 5 U 9.9 U NA 0.2 U 5 U 5 U 5 U 5 U NM-G6D DUP 10/24/2001 5 U 10 u 10 U 10 u 10 U 5 U 5 U 5 U PAMW-02 11/13/2000 4.200 10 u 10 u 10 u 10 U 500 U 500 U 500 U PAMW-02 10/16/2001 2,600 10 u 10 u 10 u 10 U 7 5 U 22 PAMW-02 5/2/2005 4,600 13 U ID U 10 u 10 U 23 7 28 PAMW-02 9/13/2005 4,700 J 11 1D U 10 u 10 u 50 U 50 U 50 U PAMW-02 12/16'2005 1,700 10 u 10 U 10 u 10 U 6 5 U 5 U PAMW-02 2/22/2006 3,300 10 u 10 U 10 u 10 u 17 5 U 18 PAMW-02 6/13/2006 2.800 10 u 10 U 10 u 10 u 10D U 100 U 100 U PAMW-02 9/12/2D06 18.000 10 u 10 U 10 u 10 u 500 U 500 U 500 U PAMW-02 11/30/2006 5,200 10 u 10 U 10 u 10 u 500 U 500 U 500 U PAMW-02 3/20/2007 3.700 10 u ID U 10 u 10 u 12 5 U 23 PAMW-02 9/11/2007 1,700 10 u ID U 10 u 10 u 5 U 5 U 7 PAMW-02 6/17/2008 3,800 10 u 1D U 10 u 10 u 5 U 5 U 12 K-20 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzene Naphthalene 2,4-Dimethyl phenol Benzo(a)pyrene Carbazole Ethylbenzene Toluene Total Xylenes 5 1.500 700 0.2 5 700 1,000 10,000 Well Date Sampled PAMW-02 3/3/2009 4,700 10 U 10 U 10 U 10 U 50 U 50 U 50 U PAMW-02 8/19/2010 1200 10 U 10 U 10 U 10 U 5 U 5 U 5 U PAMW-02 6/21/2011 340 10 U 10 U 10 U 10 U 5 U 5 U 6 PAMW-02 3/5/2012 130 10 U 10 U 10 U 10 U 5 U 5 U 5 U PAMW-02 12/3/2012 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U PAMW-02 9/17/2013 5 U 10 u 10 u 10 U 10 U 5 U 5 U 5 U PAMW-02 5/21/2014 5 U 10 u 10 u 10 U 10 u 5 U 5 U 5 U PAMW-02 3/17/2015 52 10 u 10 u 10 U 10 u 5 U 5 U 5 U PAMW-02 12/18/2015 63 10 u 10 u 10 U 10 u 5 U 5 U 5 U PAMW-02 9/26/2016 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U PAMW-02 6/6/2017 5 U 10 u 10 u 10 u 10 u 5 U 5 U 5 U PAMW-02 3/21/2018 906 10 u 10 u 10 u 10 u 5 U 5 U 5 U PAMW-02 12/12/2016 174 10 u 10 u 10 u 10 u 5 U 5 U 5 U PAMW-02 12/11/2019 43.1 10 u NA 0.2 U 5 U 5 U 5 U 5 U PAMW-02 12/1/2020 5 U 10 u NA 0.2 U 5 U 5 U 5 U 5 U PAMW-02 11/29/2021 6.1 10 u NA 0.2 U 5 U 5 U 5 U 5 U PAMW-02 12/6(2022 8.7 9.9 U NA 0.2 U 4.9 U 5 IJ 5 U 5 U PAMW-02 DUP 9/13/20DS 1,300 J 12 10 U 10 U 10 u 18 5 U 20 PAMW-03 11/13/2000 290 10 u 10 U 10 U 10 u 50 U 50 U 50 U PM-01 C 10/11/2001 1200 160 10 U 10 u 10 u 150 9 110 PM-01C 5/2/2005 1,800 59 U 10 U 10 u 10 u 160 5 U 33 PM-01C 9/13/2005 2,000 210 10 U 10 u 10 u PM-01 C 12'16/2005 1,000 190 10 U 10 u 10 u 150 8 30 PM-01C 2/22/2006 1,100 91 10 U 10 u 10 u 170 5 U 33 PM-01C 6/13/2006 1.200 61 10 U 10 u 10 u 160 5 U 9 PM-01C 9/12/2006 1,100 23 R 10 UR 10 UR 10 UR 130 5 U 17 PM-01 C 11/30/2006 910 97 10 U 10 u 10 u 98 50 U 50 U PM-01 C 3/20/2007 1,100 250 10 u 10 u 10 u 170 6 35 PM-01 C 9/11/2007 1,000 88 10 u 10 u 10 u 120 100 U 100 U PM-01 C 6/17/2008 1,700 110 10 u 10 u 10 u 130 5 U 20 PM-01 C 3/3/2009 200 54 10 u 10 u 10 u 8.0 5 U 5 U PM-01 C 6/19/2010 2,800 37 10 u 10 u 10 u 41.0 5 U 16 PM-01 C 6/21/2011 2,600 27 10 u 10 u 10 u 5 UJ 5 UJ 5 UJ PM-OtC 3/5/2012 53 12 10 u 10 u 10 u 5 U 5 U 5 U PM-01 C 12/3/2012 2,600 10 10 u 10 u 10 u 13 J 5 UJ 12 J PM-01 C 9/17/2013 2,500 13 10 u 10 u 10 u 13 J 5 UJ 14 J PM-01 C 5/21/2014 1,900 10 U 10 u 10 u 10 u 6.3 J 5 UJ 11 J PM-01 C 3/17/2015 1,510 10 u 10 UJ 10 u 10 UJ 5.6 5 U 13 PM-01 C 12/16/2015 1,210 10 u 10 u 10 u 10 u 5 U 5 U 10 J PM-01 C 9/26/2016 947 11 10 u 10 u 10 5 U 5 U 8 J PM-01 C 616/2017 761 10 u 10 u 10 u 10 u 5 U 5 U 11 J PM-01 C 3/21/2018 587 10 u 10 u 10 u 10 u 5 U 5 U 7 J PM-01 C 12/12/2018 557 10 u 10 u 10 u 10 u 5 U 5 U 10 PM-01 C 12/11/2019 440 J 11 u NA 02 LI J 5 UJ 5 UJ 5 UJ 10 UJ K-21 ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzene naphthalene 2.4-Dimethyl phenol Benzo ------- Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022 Cleanup Goal: Benzene Naphthalene 2,4-Dimethylphenol Benzo(a)pyfene Carbazole Ethylfoenzene Toluene Total Xylenes 5 1.500 700 0,2 5 700 1.000 10,000 Well Dale Sampled TBD30812 3/8/2012 5 U 5 U 5 U 5 U TB031412 3/14/2012 5 U 5 U 5 U 5 U TB031512 3/15/2012 5 U 5 U 5 U 5 U TB112912 1109/2012 5 U 5 U 5 U 5 U TB12Q312 12/3/2012 5 U 5 U 5 U 5 U TB091713 9/17/2013 5 U 5 U 5 U 5 U TB091913 9/19/2013 5 U 5 U 5 U 5 U TB052014 5/20/2014 5 U 5 U 5 U 5 U TB052214 5/22/2014 5 U 5 U 5 U 5 U TB03172D15 3/17/2015 5 U 5 U 5 U 5 U TB03192D15 3/19/2015 5 U 5 U 5 U 5 U TB12182015 12/1B/2015 5 U 5 U 5 U 5 U TB12212015 12/21/2015 5 U 5 U 5 U 5 U TB092616 9/28/2018 5 U 5 U 5 U 5 U TB 092816 9/28/2016 5 U 5 U 5 U 5 U TB06062D17 6/6/20T7 5 U 5 U 5 U 5 U TB032118 3/21/2018 5 U 5 U 5 U 5 U TB121218 12/12/2018 5 U 5 U 5 U 5 U TBI 21219 12/12/2019 5 U 5 U 5 U 5 U TBI20120 12/1/2020 5 U 5 U 5 U 5 U TRIP BLANK 11/29/2021 5 (J 5 U 5 U 5 U TRIP BLANK 12^6/2022 5 U 5 U 5 U 5 U USGS-01 1/13/1994 3 J 3 J 10 U 10 U 10 U 10 U 10 U 6 J USGS-02D 1/13/1994 10 U 5 J 10 U 10 U 10 U 10 U 10 U 10 U USGS-Q2D 12/2/1998 5 U 25 U 25 U 0.75 U 12 U 5 U 5 U 5 U USGS-02D 11/15/2000 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 u USGS-02D 10/23/2001 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U USGS-03 1/7/1994 50 U 10 U 10 UJ 10 U 10 U 50 U 50 U 50 U USGS-03 12/2/1998 5 U 10 U 9.80 U 0.29 U 4.90 U 5 U 5 U 5 U USGS-03 11/15/2D0D 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U USGS-03 10/23/2001 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U USGS-03 DUP 10/23/2001 5 U 10 U 10 U 10 U 10 U 5 U 5 U 5 U Note: N.A - Not available K-23 ------- Figure K-5: Apparent DNAPL Thickness - Intermediate Sand Units (December 2019) K-24 ------- NOT MEASURED DNAPL ACCUMULATION SCSPA ELECTRICAL SUBSTATION TRUCK ACCESS ROUTE BM-04D (TRACE) NOTE: SEE TABLE 3 FOR DATES OF DNAPL THICKNESS MEASUREMENTS. CONTROL BUILDING I ARTESIAN WELL ------- Figure K-7: Apparent DNAPL Thickness -Intermediate Sand Units (November 2021) K-26 ------- Figure K-8: Apparent DNAPL Thickness - Intermediate Sand Units (December 2022) K-27 ------- APPENDIX L - DNAPL DATA L-l ------- Table L-l:Cumulative Total of DNAPL Recovered Time Period Duration (months) Gallons Recovered111 Reporting Period Average Per fvlosilh (galions) October 1998 - February 28, 2001 28 1,320 47,1 March 1, 2001 - February 28, 2002 12 683 56.9 March 1, 2002 - August 30. 2002 6 2.356 392.5 September 1, 2002 - November 30. 2002 3 1,328 441.7 December 1, 2002 - May 31. 2003 6 1.884 314.0 June 1, 2003 - November 30, 2003 6 2,415 402,5 December 1, 2003 - May 31, 2004 6 1,329 321.5 June 1, 2004 - November 30, 2004 6 2,018 338.3 December 1, 2004 - May 31, 2005 6 1.334 222,4 June 1. 2005 - November 30. 2005 6 1,725 288.7 December 1. 2005 - May 31, 2008 6 1,345 224.1 June 1, 2006 - November 30, 2006 6 1.309 218.1 December 1, 2008 - May 31, 2007 6 986 161.0 June 1, 200? - November 30, 2007 6 1.025 170.8 December 1, 2007 - May 31, 2008 6 653 108.8 June 1, 2008 - November 30, 2008 6 844 107,4 December 1, 2008 - May 31, 2009 6 465 77.6 June 1, 2009 - November 30, 2009 6 800 100.1 December 1, 2009 - May 31, 2010 6 418 89.7 June 1, 2010 - November 30. 2010 8 540 90.0 December 1, 2010 - May 31, 2011 6 396 86.0 June 1, 2011 - November 30, 2011 6 486 80.9 December 1. 2011 - May 31. 2012 6 403 87,2 June 1, 2012 - November 30, 2012 6 512 85.4 December 1, 2012 - May 31, 2013 6 413 88.9 June 1, 2013 - November 30,, 2013 6 813 102,1 December 1, 2013 - May 31. 2014 6 1,020 170.0 June 1. 2014 - November 30, 2014 6 1,200 200,0 December 1, 2014 - May 31, 2015 6 1,252 208,7 June 1, 2015 - November 30, 2015 6 1.242 207.0 December 1, 2015 - May 31, 2018 6 1.135 189.1 June 1, 2018 - November 30, 2018 6 1,209 201,5 December 1. 2018- May 31, 2017 6 1,204 200.8 June 1, 2017 - November 30, 2017 6 1.238 208.4 December 1, 2017 - May 31, 2018 fi © 1,088 178,1 June 1, 2018 - November 30, 2018 6 1,146 191.0 December 1, 2018 - May 31, 2019 6 1.121 188.8 June 1, 2019 - November 30, 2019 6 1,283 213.8 December 1, 2019 - May 31, 2020 6 1,407 234.6 June 1, 2020 • November 30, 2020 6 1.482 247.0 December 1, 2020 - May 31, 2021 6 1,259 209.9 June 1, 2021 - November 30, 2021 6 1,591 265.2 December 1, 2021 - May 31, 2022 6 1,374 229,0 June 1 , 2022 - November 30. 2022 6 1,495 249.2 December 1 , 2023 - May 31, 2023 6 1,808 288.0 Total 52,113 Notes: i! I (iMm-, .hp hast-l on volume ri",ivure<* hi >mm! tn slotf* DNftf'L inmriii i«nnw>i opL'ratiriiiE. L-2 ------- Table L-2: Summary of DNAPL Shipments from January 2000 to May Drum Shipment Dates and Locations Number of Drums ONYX Environmental Services: January 27, 2000 24 January 24, 2002 13 May 13, 2002 15 Juiy 12, 2002 13 September 9, 2002 18 October 28, 2002 16 November 9, 2002 18 January 16, 2003 12 May 1, 2003 23 July 28, 2003 23 October 16. 2003 19 November 18, 2003 25 February 26, 2004 19 June 16, 2004 16 November 9, 2004 30 March 14, 2005 21 June 21, 2005 14 September 28, 2005 26 November 7, 2005 24 Total: 369 Pollution Control Industries (PCI) April 6, 2006 22 November 14, 2006 14 February 8, 2007 21 January 24, 2008 30 February 24, 2009 18 March 3, 2009 6 Total: 111 TRADEBE (PCI was acquired by Tradebe) July 20, 2010 21 January 25,2011 11 December 9, 2011 12 Octobers, 2012 11 August 2, 2013 12 March 11, 2014 16 July 3, 2014 13 December 3, 2014 19 April 27, 2015 14 September 1, 2015 19 January 26, 2018 15 May 31, 2016 16 November 1, 2016 21 April 25, 2017 20 October 9, 2017 18 March 26, 2013 18 September 18, 2018 19 February 15, 2019 20 August 20, 2019 18 April 21, 2020 16 August 12, 2020 18 January 7, 2021 18 June 9, 2021 18 Total: 383 Giant Resource Recovery-Sumter, Inc. March 8, 2022 45 October 11, 2022 30 January 24, 2023 18 Total: 93 Total Number of Drums: 956 L-3 ------- Table L-3: Apparent DNAPL Thickness Monitoring Schedule Well Monitoring Frequency DRW-06 Weekly MM-02B Weekly CM-03A Monthly MW-12A Monthly DRW-52C Quarterly DRW-53C Quarterly MM-01B Quarterly MM-11A Quarterly DRW-48 Quarterly DRW-51 Quarterly A3-T3 Semi-annual DRW-02 Semi-annual DRW-08 and 09 Semi-annual DRW-12 thru DRW-42 Semi-annual DRW-45 thru DRW-47 Semi-annual DRW-49 and 50 Semi-annual MZ-55A Semi-annual DRW-07 Annual DRW-10 Annual DRW-11 Annual LM-10AR Annual MM-03A Annual MM-15C Annual MRW-03 Annual MRW-04 Annual MRW-05 Annual MRW-06 Annual MZ-06M Annual MZ-06U Annual ORC-7 Annual PM-02A Annual Shallow Monitoring Wells Annual Intermediate Monitoring Wells Annual Notes: (1) Includes shallow monitoring wells in the current annual groundwater monitoring program. The next shallow groundwater monitoring event is planned in Second Quarter 2024. (2) Includes intermediate monitoring wells in the current annual groundwater monitoring program. The next intermediate groundwater monitoring event is planned in Fourth Quarter 2023. (3) Annual DNAPL monitoring planned in April of each year. L-4 ------- SEGMENT 2 DATE GALLONS MAR-02 - NOV-02 857.5 DEC-02 - NOV-03 1.354.5 DEC-03 - NOV-04 1,056.8 DEC-04 - NOV-05 1.399.2 DEC-05 - NOV-06 1,247.4 DEC-06 - NOV-07 8450 DEC-07 - NOV-08 555.7 DEC-08 - NOV-09 409.1 DEC-09 - MAY-10 344 4 DEC-1 G - NOV-11 358.3 DEC-11 - NOV-12 307.8 DEC-12 - NOV-13 217.9 DEC-13 - NOV-14 184.1 DEC-14 - NOV-15 142.5 DEC-15 - NOV-16 146.4 DEC-16 - NOV-17 121.9 DEC-17 - NOV-18 101.7 DEC-18 - NOV-19 94.1 DEC-19 - NOV-20 85.3 DEC-20 - NOV-21 101.0 DEC-21 - NOV-22 (2) 75.1 DEC-22 - MAY-23 31.4 TOTAL: 10.037 1 Figure L-l: DNAPL Recovery Volumes by Segments (from 2002 to 2023) L-5 ------- Figure L-2: DNAPL Recovery Trends with Time L-6 SEGMENT 4 - DNAPL REMOVAL 400 §350 1 U 300 \| i § 200 1 D 150 » /^^ ^ ^^ ^ ^ ^ ^^^ Ending Reporting Period (Month and Year) SEGMENT 5 - DNAPL REMOVAL 330 Is0 S 2S0 I % 100 £ 1 of 150 k § 100 50 /yVV^VVV^VVVVVVV/^VVVV Ending Reporting Period (Month and Year) SEGMENT 6 - DNAPL REMOVAL ////// J ^ 1? if ^ 4? ^ ^ Ending Repot ting Period (Month and Year) DOMINION ENERGY SOUTH CAROLINA, INC. DNAPL REMOVAL TRENDS WITH TIME CALHOUN PARK AREA SITE CHARLESTON. SOUTH CAROLINA DATE: 10/2/2023 FILE NAME: segmentpiotB43 APEX COMPANIES. LLC ------- 1000.0 100.0 Historical Monthy DNAPL Volume Removed Historical Monthly Apparent DNAPL Thickness Time (Month and Year) Figure L-3: DRW-06 Historical Monthly Volume Removed and Apparent DNAPL Thickness L-7 ------- I I II III II II II llllIHI\|\|\| II lul II \| I * II ii ^ fV // #V// c/./ cfV ------- 3000 Summer Months (June through November) Winter Months (December through May) 2500 §, 2000 1500 < 1000 500 0 ^VVVVV Ending Reporting Period (Month and Year) Figure L-5: Total DNAPL Volume Removed During 6-Month Reporting Periods L-9 ------- Cfl c O ra 0 TJ 1 > o £ oc © £ 3 O > a < 400 300 200 2,003 Gallons Recovered Prior to March 2002 50,110 Gallons Recovered Since March 2002 (Based on Drum Measurements) 52,113 Gallons Recovered Through May 2023 Note; The increased DNAPL volume removed from October 2013 through November 2022 Is attributed to the increased ONAPL recovery from DRW-06, DOMINION ENERGY SOUTH CAROLINA tNC TOTAL ONAPL VOLUME REMOVED BY MONTH MARCH 2002 MAY 2023 CALHOUN PARK AREA SITE CHARLESTON. SOUTH CAROLINA APEX CO.\[FAMES.LLC Ending Month (Month and Year) Figure L-6: Total DNAPL Volume Removed by Month L-10 ------- Table L-4: Average Monthly DNAPL Removed Compared to Total Removal Events (June 2002 - May 2023) Time Period Duration (months) Total Gallons Reporting Period Aveiage Pet Month (qallons) Total Removal Events per period Metiic,;s June 1. 2002 - November 30. 2002 6 2.683 447 2 445 1.01 December 1. 2002 - May 31 2008 6 1.884 314 1 281 i '2 June 1. 2003 - November 30. 2003 6 2.415 402.4 334 1.20 December 1. 2003 - May 31. 2004 6 1.928 321 4 369 0 87 June 1. 2004 - November 30. 2004 6 2,018 336.3 424 0.79 December 1 2004 - May 31. 2005 6 1.334 •¦)')) {4 33'' 0 67 June 1. 2005 - November 30, 2005 6 1.725 287.6 447 0.64 December 1. 2005 - May 31. 2006 6 1.345 224.1 571 0 39 June 1. 2006 - November 30. 2006 6 1.309 218.1 460 0.47 December 1. 2006 - May 31. 2007 6 966 i G > 534 0 30 June 1. 2007 - November 30. 2007 6 1.025 170 8 433 0.35 December 1. 2007 - May 3 1. 2008 6 653 100 8 474 0.23 June 1. 2008 - November 30. 2003 6 644 107 4 430 0.25 December 1. 2008 - May 31. 200G 6 465 77.6 486 0 16 June 1. 2009 - November 30. 2009 6 600 100.1 424 0.24 December !. 2009 - May 31 2010 6 418 69 7 395 0. IS June 1. 2010 - November 30. 2010 6 540 90.0 320 0.28 December 1. 2010 - May 31, 2011 6 396 66 0 317 June 1. 2011 - November .30. 2011 6 486 80.9 302 0 27 December 1 2011 - May 31. 2012 6 403 67 2 317 0.21 June 1. 2012 - November 30. 2012 6 512 85.4 230 0.30 December 1. 2012 - May 31. 2013 6 413 68.9 275 June 1. 2013 - November 30. 2013 6 613 102.1 271 0.38 December 1. 20i3 - "way 31. 2014 6 1.020 170 0 280 June 1 2014 - November 30, 2014 6 1.200 200.0 262 0.76 December 1. 2014 - May 31. 2015 6 1.252 203 7 262 0.80 June 1. 2015 - November 30. 2015 6 1.242 207 0 258 0.80 December 1. 2015 - May 31. 2016 6 1.135 189.1 231 0.82 June 1. 2016 - November 30. 2016 6 1.209 201.5 251 0.80 December 1. 2016 - May 31. 2017 6 1.204 200 6 909 0 90 June 1. 2017 - November 30. 2017 6 1.236 206.4 241 0.86 December 1 2017 - May 31. 2016 6 1.068 176 1 ¦ • o.ao June 1. 2018 - November 30. 2018 6 1.146 191 0 213 0 90 ; ¦ - ' - ' ' ¦ 6 1.121 186 is 233 0.80 June 1. 2019 - November 30. 2019 6 1.283 213.8 234 0.91 ¦ ¦ ¦ • .' " . 6 1 407 234.6 214 1.10 June 1, 2020 - November 30. 2020 6 1.482 247.0 243 1.02 December 1. 2020 ¦ May 31. 2021 6 1.259 209 8 216 0 97 June 1. 2021 - November 30, 2021 6 1.591 265 2 232 1.14 December 1. 2021 - May 31. 2022 6 1.374 229 0 217 1.06 June 1. 2022 - November 30. 2022 6 1.495 249.2 232 1.07 December 1. 2022 - May 31. 2023 6 1.608 268 0 203 1.32 Notes: (1) Gallons recovered are based on volume measured in drums used to store DNAPL during removal operations and includes all wells. (2) Developed to quantify DNAPL removal efficiency. Metric is the reporting period average monthly volume removed divided by the total number of removal events for tie period, L-ll ------- Table L-5: Evaluation and Interpretation of Removal Trends for Trench DNAPL Recovery Wells (Winter periods 2008 - 2023) Segment Slope (gallons/year) Correlation Coefficient (R2) Cumulative DNAPL Volume Removed-1! (gallons) Interpretation Segment 1 0.0 0.00 577.9 Poor R2 suggests data variability during the DNAPL recovery period evaluated. The trend is essentially flat indicating DNAPL recovery is asymptotic (i.e., recovery and recharge are essentially equal). Segment 2 -10.1 0.89 10,037.1 Good R2 suggests DNAPL recovery data has followed a predictable trend. Thetrend is negative suggesting depletion is occurring at an approximate rate of 10.1 gallons per year. Segment 3 -0.2 0.05 1,903.0 Poor R2 suggests data variability during the DNAPL recovery period evaluated. Thetrend is slightly positive, slope shallow, and indicates DNAPL recovery is asymptotic (i.e., recovery and recharge are essentially equal). Segment 4 -0.4 0.19 2,361.4 Poor R2 suggest data variability during the DNAPL recovery period evaluated. Thetrend is slightly negative, slope shallow, and indicates DNAPL recovery is asymptotic (i.e., recovery and recharge are essentially equal). Segment 5 -1.9 0.74 3,682.1 Moderate R2 suggests some DNAPL recovery data variability over period evaluated. Thetrend is negative and suggests depletion is occurring at an approximate rate of 1.9 gallons per year. Segment 6 -3.6 0.77 5,516.4 Moderate R2 suggests some DNAPL recovery data variability over period evaluated. The trend is negative and suggests depletion is occurring at an approximate rate of 3.6 gallons per year. L-12 ------- Table L-6: Summary ofApparent DNAPL Thicbiess in Wells and Averages Apparent DNAPL Thickness (feet) Change in Apparent DNAPL Percent Change from and Dates Measured"'" Thickness from March 2002 March 2002 to Well March 2002 March 13-16, 2023 to March 2023 (feet) March 2023 DNAPL Recovery Wells DRW-02(JI 3.65 0.01 -3.64 -100% DRW-06 2.29 11.00 8.71 380% DRW-O?™^ 0.42 0.18 -0.24 -57% DRW-08 0.50 0.20 -0.30 -60% DRW-09(3)H 0.00 0.01 0.01 undefined DRW-10(3Kb) 0.00 0.00 0.00 no change DRW-11<3' 0.00 0.00 0.00 no change DRW-12 1.42 0.20 -1.22 -86% DRW-13 1.00 0.31 -0.69 -69% DRW-14 1.33 0.10 -1.23 -92% DRW-15 1.67 0.11 -1.56 -93% DRW-16 0.96 0.15 -0.81 -84% DRW-17 0.88 0.11 -0.77 -88% DRW-18 0.21 0.25 0.04 19% DRW-19 0.17 0.13 -0.04 -24% DRW-20 3.83 0.14 -3.69 -96% DRW-21 2.92 0.27 -2.65 -91% DRW-22 0.46 0.08 -0.38 -83% DRW-23 0.54 0.10 -0.44 -81% DRW-24 1.42 0.13 -1.29 -91% DRW-25 3.08 0.15 -2.93 -95% DRW-26 2.13 0.15 -1.98 -93% DRW-273' 0.17 0.01 -0.16 -94% DRW-28 1.25 0.13 -1.12 -90% DRW-29131 0.30 0.00 -0.30 -100% DRW-30 1.83 0.08 -1.75 -96% DRW-31(J) 1.50 0.01 -1.49 -99% DRW-32 4.67 0.24 -4.43 -95% DRW-33'3' 2.25 0.01 -2.24 -100% DRW-34 3.83 0.30 -3.53 -92% DRW-35 1.75 0.55 -1.20 -69% DRW-36 1.58 0.20 -1.38 -87% DRW-37 1.42 0.11 -1.31 -92% DRW-38 1.75 0.15 -1.60 -91% DRW-39 1.25 0.12 -1.13 -90% DRW-40 0.67 0.20 -0.47 -70% DRW-41 2.50 0.16 -2.34 -94% DRW-42 1 17 0.28 -0.89 -76% DRW-45 2.08 0.11 -1.97 -95% DRW-46 0.92 0.15 -0.77 -84% DRW-473"41 0.00 0.13 0.13 undefined DRW-48(b) 0.83 0.30 -0 53 -64% DRW-4913' 0.01 0.00 -0.01 -100% DRW-50 0.54 0.10 -0.44 -81% DRW-51,el 0.33 0.30 -0.03 -9% Average Thickness (feet) 1.37 0.39 Average Change in Apparent DNAPL Thickness (feet): -0.98 Shallow Monitoring Wells Apparent DNAPL Thickness (feet) Change in Apparent DNAPL Percent Change from and Dates Measured11^1 Thickness from March 2002 March 2002 to Well March 2002 March 13-15, 2023 to September 2022 (feet) September 2022 A3-T3^> 0.00 0.01 0.01 undefined CM-03A 0.40 0.81 0.41 103% MM-11A16' 1.33 1.34 0.01 1% MW-12A13' 0.01 0.11 0.10 1000% MZ-06M™ 0.85 0.00 -0.85 -100% MZ-55A 0.35 1.65 1.30 371% ORC-7'3"4"5' 0.00 0.01 0.01 undefined Average Thickness (feet) 0.42 0.56 Average Change in Apparent DNAPL Thickness (feet): 0.14 Intermediate Monitoring Wells Apparent DNAPL Thickness (feet) Change in Apparent DNAPL Percent Change from and Dates Measured11'" Thickness from March 2002 March 2002 to Well March 2002 March 13-15, 2023 to September 2022 (feet) September 2022 DRW-52C(3K°> 0.01 0.27 0.26 2600% DRW-53C<3Ke) 0.85 0.01 -0.84 -99% MM-01B™ 3.15 0.15 -3.00 -95% MM-02B 7.00 2.65 -4.35 -62% MM-15C<3K5) 0.90 0.01 -0.89 -99% Average Thickness (feet) 2.38 0.62 Average Change in Apparent DNAPL Thickness (feet): -1.76 Notes: (1) March 2002 data used as a reference point, except for A3-T3, DRW-52C, DRW-53C, ORC-7 and MW-12A DRW-52C and DRW-53C were installed in December 2003 and DNAPL thickness measured in January 2004 used as reference Wells A3-T3, ORC-7 and MW-12A DNAPL thickness reference is September 2002 (2) Data obtained from the weekly, monthly, quarterly, semi-annual and annual apparent DNAPL thickness monitonng events for the timeframe indicated The dates listed represent the timeframe that measurements were obtained, excluding the exceptions below (3) A value of 0 01 feet generally indicates trace DNAPL was measured A value of 0 00 feet generally indicates no product was measured (4) The reference apparent DNAPL thickness is 0 00 feet and therefore quotient is undefined (5) DRW-07, DRW-10, DRW-11, MM-15C. MZ-06M and are measured annually and data is from May 2023. (6) DRW-48, DRW-51, DRW-52C. DRW-53C, MM-01B and MM-11A are measured quarterly and data is from January 2023 L-13 ------- Table L-7: DNAPL Volume Removed 6-Month Comparison RECOVERY WELLS COMPARISON OF DNAPL VOLUME REMOVED (GALLONS) Mar-02 - Auq-02 Sep-02 • Nov-02 Dec-02 - May-03 Jun-03 - Nov-03 Dec-03 - May-04 Jun-04 - Nov-04 Dec-04 - May-05 Jun-05 - Nov-05 Dec-05 - May-06 Jun-06 - Nov-06 Dec-06 - May-07 Jun-07 - Nov-07 Total AvgJ Month Total Avg./ Month Total Avg J Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg J Month Total Avg .1 Month Total Avg./ Month Total Avg./ Month Well DRW-06 489 82 132 620 103 667 111 649 108 465 77 207 35 212 35 260 43 151 25 199 33 202 34 Recovery Trench Wells DRW-08 through DRW-51 1.845 308 922 307 1,258 210 1,739 290 1.262 210 1,544 257 1,115 186 1.485 247 1,067 178 1.145 191 749 125 806 134 Shallow Monitoring Wells CM-03A, MM-11A MW- I2A. MZ-06M and MZ-55A 1.91 032 021 0.07 0.85 0 14 0 70 0 12 0.68 0.11 021 004 0.31 0.05 I 47 0 25 0.86 014 024 004 0.70 0.12 0 17 0 03 Intermediate Wells DRW-52C, DRW-53C, MM-01B. MM-02B and MM- I5C 2018 3.36 - 226 5.47 091 806 1 34 17.59 2.93 9 22 1 54 11.33 1 89 15 10 2 52 14.62 2.44 11 97 200 17 00 2.83 15 64 2 61 Total 2,356 393 1.326 442 1,885 314 2,415 402 1,929 322 2,018 336 1,334 222 1,713 286 1,342 224 1,309 218 965 161 1,024 171 RECOVERY WELLS COMPARISON OF DNAPL VOLUME REMOVED (GALLONS) Dec-07 - May-08 Jun-08 - Nov-08 Dec-08 - May-09 Jun-09 - Nov-09 Dec-09 - May-10 Jun-10- Nov-10 Dec-10- May-11 Jun-11 - Nov-1t Dec-11 - May-12 Jun-12 - Nov-12 Oec-12 - May-13 Jun-13 - Nov-13 Total Avg./ Month Total Avg J Month Total Avg./ Month Total Avg J Month Total Avgi Month Total Avg./ Month Total Avg J Month Total Avg./ Month Total Avg J Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Well DRW 06 88 15 68 11 75 13 90 15 65 11 88 15 66 11 62 10 73 12 87 15 109 18 271 45 Recovery Trench Wells DRW-08 Ihiough DRW-51 551 92 560 93 375 62 497 83 341 57 444 74 321 53 4I3 69 319 53 412 69 296 49 333 5r> Shallow Monitoring Wells CM-03A, MM-11A MW- 12A, MZ-06M and MZ-55A 0 17 003 1 04 0 17 1.32 0.22 0 22 004 085 014 0 88 0 15 1.05 018 1 16 0 19 1 41 0.24 1 03 0 17 0.43 007 1 43 0 24 Intermediate Wells DRW-52C, DRW-53C, MM-01B. MM-02B and MM-15C 13.48 2.25 15.47 2.58 14.16 2.36 10.25 1.71 11.32 1 89 7.50 1 25 7 94 1.32 9 73 1 62 9.26 1.54 900 1.50 8 07 1.35 7 78 1.30 Total 653 109 644 107 465 78 597 99 418 70 540 90 396 66 486 81 403 67 510 85 413 69 613 102 RECOVERY WELLS COMPARISON OF DNAPL VOLUME REMOVED (GALLONS) Dec-13 - May-14 Jun-14 - Nov-14 Dec-14 - May-15 Jun-15- Nov-15 Dec-15 - May-16 Jun-16 • Nov-16 Dec-16- May-17 Jun-17 • Nov-17 Dec-17 - May-18 Jun-18 - Nov-18 Dec-18-May 19 Jun-19 - Nov-19 Total Avg J Month Total Avg J Month Total Avgi Month Total Avg ./ Month Total Avg./ Month Total Avg./ Month Total Avg .1 Month Total Avg./ Month Total Avg J Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Well DRW-06 743 124 890 148 1,010 168 947 158 894 149 895 140 957 160 955 159 845 141 892 149 903 150 1.027 171 Recovery Trench Wells DRW-08 through DRW-51 266 44 300 50 232 39 286 48 232 39 306 51 238 40 270 45 213 35 245 41 206 34 246 41 Shallow Monitoring Wells A3-T3. CM-03A, MM-11 A. MW 12A, MZ-06M, MZ-55Aand ORC-7'11 2.32 0.39 0.72 0.12 1 03 0.17 0.44 0.07 1.02 0.17 0.50 0.08 0.65 0.11 0.55 0.09 1.50 0.25 0.35 0.06 1 85 0.31 1.00 0.17 Intermediate Wells DRW-52C, DRW-53C, MM-01B MM-02B and MM-15C 8.33 1.39 7 75 1.29 9.03 1.51 827 1 38 7.59 1.27 8 32 1 39 7.65 1.28 12 25 2 04 9.50 1.58 835 1 39 10.5 175 8 25 14 Total 1,020 170 1,199 200 1,252 209 1,242 207 1,135 189 1,210 202 1,204 201 1,237 206 1,068 178 1.146 191 1,121 187 1,283 214 RECOVERY WELLS COMPARISON OF DNAPL VOLUME REMOVED (GALLONS) Dec-19 - May-20 Jun-20 - Nov-20 Dec-20 - May-21 Jun-21 - Nov-21 Dec-21 - May-22 Jun-22 - Nov-22 Dec-22 - May-23 Total Avg J Month Total AvgJ Month Total Avg J Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Total Avg./ Month Well DRW-06 1.210 202 1.241 207 1.075 179 1.368 228 1.210 202 1,316 219 1.474 246 Recovery Trench Wells DRW-08 through DRW-51 188 31 228 38 173 29 212 35 151 25 168 28 126 21 Shallow Monitoring Wells A3-T3, CM-03A, MM-11 A. MW-12A, MZ-06M, MZ-55A and ORC-711' 0.85 014 1 10 0 18 1.15 019 0 70 0 12 1.05 0.18 0 7 0 12 1.05 018 Intermediate Wells DRW-52C, DRW-53C. MM 01B. MM-02B and MM I5C 8.25 1.4 11.65 1.94 1020 1.70 10.40 1 73 11.35 1 89 1035 1 73 7.5 1.25 Total 1,407 235 1,482 247 1,260 210 1,591 265 1,374 229 1,495 249 1,608 268 Notes: (1) Shallow monitoring well A3-T3 was added Airing the June 2014 through November 2014 event due to the well being pumped for the first time Pumping has not been performed on ORG 7 due to the limited DNAPL volume in this well L-14 ------- 600.0 500.0 400.0 300.0 200.0 100.0 L Nov May Nov May Nov May Nov May Nov May Nov May Nov- May Nov May Nov May Nov- May Nov- May Nov- May Nov May Nov May- Nov- May- Nov May Nov- May Nov May Nov May Nov May- Nov May 02 03 03 04 04 05 05 0b 06 07 07 08 08 09 09 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 ¦Average Gallons Removed Per Month 447 2 314.1 4024 321.5 336 3 2224 287 6 224.1 2181 1610 170 8 108 8 107 4 77 6 100 1 69,7 900 660 809 672 854 689 102 1 170 0 200 0 208 7 207 0 189 1 2015 200 7 206 3 1780 191 0 1868 213 8 234 5 247 0 209 8 265 2 229 0 249 2 268 0 ¦Total Number of Removal Events 445 281 334 369 424 332 447 571 460 534 483 474 430 486 424 394 320 317 302 317 280 275 271 280 262 262 258 231 251 222 241 222 213 233 234 214 243 216 232 217 232 203 Ending Reporting Period (Month and Year) Figure L-7: Average Monthly Volume Removed and Total Removal Events During 6-Month Reporting Periods L-15 ------- 6 Cn/linn Dr+ inn Dnrinrl /Mnntk inrl Vft«»r\ Figure L-8: Plot of Average DNAPL Manually Removed per Removal Event Versus Time L-16 ------- 2000 1800 25 50 75 100 125 150 175 200 225 250 Time Elapsed (months) Not: Includes all wells where DNAPL was removed except gasholder wells (DRW-02, DRW-06, and DRW-07). Figure L-9: Linear Plot of Volume Removed Versus Time for Winter Months (December through May) L-17 ------- Table L-8: MW-12A DNAPL Measurements and Pumping Activity Date Apparent DNAPL Thickness (feet) DNAPL Removed (gallons)'2 08/25/92 Well Installed - 09/04/92 021 0.03 09/28/92 NP'" NR'" 01/06/00 0 40 0 06 01/07/00 Trace NR 01/31/00 Trace NR 02/11/00 Trace 0.05 07/06/00 Trace NR 07/26/00 Trace NR 12/12/00 0.06 NR 03/21/01 Trace NR 03/30/01 ORC Socks Installed 04/16/02 ORC Socks Removec 09/09/02 Trace NR 11/18/02 0.35 NR 01/07/03 025 NR 03/04/03 0.25 NR 04/08/03 0 17 NR 07/07/03 0.40 NR 09/09/03 040 NR 10/08/03 057 NR 01/12/04 0.80 NR 03/02/04 025 NR 04/06/04 0.16 NR 07/07/04 0.50 NR 10/06/04 Trace NR 01/11/05 0.90 NR 04/05/05 090 NR 07/08/05 Trace NR 08/25-30/05"" 0.13 NR 10/07/05 0 30 NR 01/12/06 0.20 NR 04/06/06 006 NR 07/06/06 0.23 NR 10/02/06 0 15 NR 01/10/07 0.46 NR 03/05/07 0.40 NR 04/03/07 0.15 NR 12/06/07 1 86 NR 07/16/08 3.71 060 08/29/08 1.15 0.19 09/03/08 0.24 NR 12/05/08 2 35 0 38 01/12/09 1 62 026 02/06/09 081 NR 03/26/09 1.43 0.23 04/06/09 0 15 NR 05/07/09 0.71 NR 05/15/09 0.8 0 13 06/01/09 0.15 NR 07/01/09 0.72 0.12 07/09/09 0 22 NR 08/06/09 0.60 0.10 09/02/09 0 35 NR 10/05/09 0.49 NR 11/03/09 0.53 NR 12/03/09 0 90 NR 01/06/10 1.43 NR 01/13/10 1.43 0.23 02/05/10 1.05 NR 02/22/10 1.80 0.29 03/04/10 0.36 NR 04/09/10 093 NR 04/12/10 093 0 15 05/24/10 1.10 0 18 06/09/10 0 34 NR 07/19/10 078 NR 08/05/10 0 75 NR 09/02/10 1 58 026 09/16/10 0.81 NR 10/12/10 1.70 0.28 Date Apparent DNAPL Thickness (feet) DNAPL Removed (gallons)'2 ! 11/15/10 2.10 0.34 12/15/10 0.84 NR 01/07/11 2.15 NR \| 01/14/11 2 15 0.35 02/07/11 1.00 NR 03/16/11 2.20 NR 03/22/11 220 0.36 04/07/11 0.88 NR 05/03/11 1 00 0.16 05/24/11 1.08 0.18 06/09/11 1.15 NR 06/10/11 1.15 0.19 07/07/11 0.67 0.11 08/04/11 1.40 NR 08/05/11 1.40 0.23 08/31/11 1 51 025 09/15/11 0.82 NR \| 10/13/11 1.60 NR 11/03/11 236 038 12/08/11 1.25 NR I 12/21/11 1 25 NR 01/05/12 1.24 NR I 01/12/12 1.24 020 02/15/12 192 NR 02/22/12 1.92 0.31 03/09/12 1.00 NR 04/03/12 1.40 0.23 05/10/12 2.25 NR 05/17/12 2.25 0.37 06/07/12 1 15 NR 07/12/12 1.85 NR 07/18/12 2.02 0 33 08/08/12 1.10 0.18 09/19/12 1.30 NR 09/20/12 1 30 021 10/11/12 0.90 0.15 11/19/12 1.00 NR 11/20/12 1.00 0.16 12/14/12 0 65 NR 01/11/13 1.00 NR 01/31/13 1.03 0.17 ! 02/21/13 0.53 NR ! 02/21/13 055 009 03/11/13 0 38 NR 04/05/13 066 NR 04/25/13 072 0.12 05/09/13 035 NR 06/04/13 0.88 NR 06/06/13 0.88 0.14 07/10/13 0.60 NR 08/08/13 1.95 0.32 09/18/13 0.90 NR 10/09/13 1.00 NR 10/31/13 1.25 0.20 11/21/13 1.25 0.20 12/19/13 0.55 NR 02/03/14 1.30 NR 02/05/14 1.30 0.21 02/26/14 1.03 NR 03/13/14 065 NR 04/07/14 0.88 NR I 04/09/14 0.88 0.14 05/20/14 0.55 NR 05/21/14 055 009 06/11/14 0 57 0.09 07/17/14 0.51 NR 08/11/14 080 NR 09/17/14 1.30 0.21 10/06/14 0 46 NR 11/19/14 1.22 NR i 12/10/14 1 20 0.20 Date Apparent DNAPL Thickness (feet) DNAPL Removed (gallons)'2* 01/13/15 0.58 NR 02/05/15 0.73 NR I 02/25/15 0.89 0.15 I 03/31/15 047 NR 04/08/15 0 50 0.08 05/13/15 0 42 NR 06/08/15 0.63 NR 07/01/15 0.65 0.11 07/15/15 0.20 NR ! 08/07/15 0.65 NR 09/18/15 1.02 NR I 09/21/15 1.02 0 17 \| 10/12/15 0.00 NR 11/19/15 0.81 NR I I 12/16/15 0.94 0.15 01/26/16 0 62 NR i 02/25/16 0.60 0.10 I 03/29/16 0.45 NR 04/25/16 0.70 NR \| 05/16/16 0.75 NR 06/02/16 0.68 NR 07/19/16 0.25 NR I 08/26/16 1 13 NR 08/31/16W 1.20 0 25 I 09/19/16 0.43 NR l\| 10/13/16 0.45 NR I 11/21/16 0.70 NR J 12/19/16 0.93 NR i 01/25/17 1.05 NR 02/20/17 1.15 NR 03/28/17 1.35 NR i 03/29/17 1.35 0 25 04/19/17 0.28 NR 05/15/17 0.70 NR 06/23/17 0.75 NR ! 07/13/17 0.70 NR I 08/22/17 0.75 NR I 08/30/17 0.85 0.15 I 09/18/17 0 25 NR 10/11/17 0.50 0 10 \| I 10/25/17 0.44 NR \| ( 11/16/17 0.55 NR f 12/12/17 0.55 NR 01/24/18 0.84 NR 02/20/18 0 85 NR I 02/21/18 0.85 0 15 I 03/14/18 0.38 NR t 04/18/18 0.55 NR \| 05/14/18 0.60 NR 06/06/18 0 70 0.15 f 06/20/18 0.37 NR 07/13/18 0 35 NR I 08/22/18 0.74 NR i 09/19/18 0.58 NR 10/08/18 0 44 NR \| \ 11/19/18 0.70 NR ,i 12/18/18 0.83 NR 01/29/19 0.85 NR 01/30/19 0.85 0.20 I 02/18/19 0 45 NR I 02/20/19 0.45 0.15 03/11/19 0.33 NR 04/17/19 0.60 0 75 I 05/14/19 0 15 NR I 06/19/19 016 NR i 07/15/19 0.15 NR 08/21/19 0.50 NR 09/16/19 0.30 NR I 10/23/19 0 84 NR \| ( 10/29/19 0.50 0.10 11/19/19 Trace NR \| Date Apparent DNAPL Thickness (feet) DNAPL Removed (gallons)'2' 12/19/19 0 15 NR 01/15/20 TRACE NR I 02/26/20 0.13 NR 03/17/20 0 18 NR 04/06/20 0.20 NR 05/20/20 0.55 NR 06/10/20 040 0 10 ! 07/22/20 0 17 NR 08/28/20 0 21 NR 09/22/20 0.14 NR 10/27/20 0 28 NR 11/24/20 0.24 NR i 12/16/20 0.38 NR 01/26/21 0.42 NR 02/03/21 0.50 0.10 02/25/21 Trace NR 03/17/21 0.11 NR 04/07/21 0.10 NR 05/19/21 0.15 NR 06/30/21 022 NR 07/21/21 0 18 NR ! 08/26/21 0.18 NR 09/22/21 0 52 NR 10/29/21 023 NR 11/24/21 0.18 NR 12/15/21 0.40 0.10 01/26/22 0.10 NR I 02/23/22 0.27 NR 03/16/22 0.27 NR 04/27/22 0 62 0.10 05/17/22 Trace NR l 06/29/22 024 NR 07/18/22 027 NR 08/31/22 0.30 NR I 09/21/22 0.51 0 10 10/26/22 0.13 NR 11/22/22 0 33 NR ! 12/14/22 0.57 NR I 01/11/23 0 68 0 15 02/23/23 0 15 NR 03/15/23 0.11 NR 04/05/23 042 0.10 \| 05/16/23 0.15 NR I Notes: Total Gallons Removed: 14.17 (1) NP - Not Present, NR - Not Removed (2) From 1992 to 2000, the volume of DNAPL removed was calculated as a percentage of water and DNAPL pumped from the well. From July 16, 2008 to August 31, 2016 the DNAPL volume removed is based on the in-well volume derived from the apparent DNAPL thickness measurement Starting on August 31, 2016, the DNAPL volume removed is based on the estimated bucket volume of DNAPL removed from the well. (3) Well rehabilitation period via Fenton's Reagent. I.-18 ------- APPENDIX M - SITE PHOTOGRAPHS M-l ------- PARKING MTR 'l CHARLOTTE ST. Site Photograph M-l: DESC 1/2 Charlotte Street Substation Entrance M-l ------- Site Photograph M-2: DESC Substation (looking east to west) Site Photograph M- 3: Middle of DESC Substation (looking from southeast to northwestf M-2 ------- Site Photograph M-5: DESC Substation (looking from top of parking garage towards the Ports Authority) Site Photograph M-4: Calhoun Park Area (looking from parking garage east towards the Cooper River) M-3 ------- Site Photograph M-7Calhoun Park Area (looking from parking garage south towards Gadsdenboro Park) Site Photograph M-6: Cooper River (looking from Charlotte Street Park Irish Memorial south) M-4 ------- Site Photograph M-8: DRW-35 M-5 ------- Site Photograph M-9: DRW-33 M-6 ------- Site Photograph M-10: DRW-6 (555th drum) M-7 ------- M-8 ------- APPENDIX N - INSTITUTIONAL CONTROL INSTRUMENTS N-l ------- IIIIIIIIIIIUIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII BP0759782 Upon Recording. Return To: Attn: Project Manager Federal Remediation Bureau of Land and Waste Management DHEC 2600 Bull Street Columbia. South Carolina 29201 STATE OF SOUTH CAROLINA ) ) DECLARATION OF COVENANTS COUNTY OF CHARLESTON ) AND RESTRICTIONS THIS DECLARATION OF COVENANTS AND RESTRICTIONS (the "Declaration") is made and entered into this 1 day , 2018 (the "Effective Date"), by SOUTH CAROLINA ELECTRIC & GAS COMPANY (hereinafter referred to as "SCE&G"), the SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL (hereinafter referred to as the "Department"), and the UNITED STATES ENVIRONMENTAL PROTECTION AGENCY (hereinafter referred to as the "EPA"). , RECITALS WHEREAS, SCE&G is the owner of certain real property located at 1 Charlotte Street, Charleston, Charleston County, South Carolina, with Charleston County Property I.D. 4591304002, containing 3.746 acres, more or less, and as more particularly shown on that certain Boundary Survey of 1 Charlotte Street, City of Charleston, dated June 11, 2018. and prepared by Forsberg Engineering and Surveying, Inc. for SCE&G, attached hereto and incorporated herein as Exhibit A (the "Property"): and WHEREAS, the Property, as well as other surrounding property generally defined as the Calhoun Park Area Site (the "CPA Site") as that term is defined herein, has been the subject of a non-time-critical removal action, subject of and pursuant to the following matters: (i) that certain Administrative Order on Consent for Removal Action in CERCLA Docket No: 98-16-C dated as of May 22. 1998 (the "AOC") issued by the EPA under the Comprehensive Environmental Response Compensation and Liability Act ("CERCLA"), 42 U.S.C. §§ 9601, et seq.; (ii) the Record of Decision issued by the EPA with EPA ID: SCD987581337/OU 01 on September 30, 1998 (the "ROD"); and (iii) the Unilateral Administrative Order for Remedial Design and Remedial Action issued by the EPA in U.S. EPA Docket No. 99-08-C on January 13, 1999 (the "UAO"); and WHEREAS, SCE&G has completed all required work, including, but not limited to, all Remedial Design and Remedial Actions required, and in accordance and in compliance with the AOC, ROD and the UAO as they relate to the Property as well as to the CPA Site, as that term is defined in the AOC, ROD, and the UAO: and 1 N-2 ------- WHEREAS, at this time, the Property may be used for certain purposes without further remediation by SCE&G subject to the requirements of this Declaration; and WHEREAS. SCE&G agrees by the recording of this Declaration to impose certain restrictions on the manner in which the Property may be developed and utilized: and WHEREAS, it is the intention of all parties that that the EPA shall be considered a third- party beneficiary of this Declaration, and that the restrictions contained in this Declaration shall be enforceable by either the EPA, the Department, or their successor agencies and assigns; and WHEREAS, the EPA has worked closely with the Department in developing the AOC, and the EPA will assist the Department in monitoring and enforcing this Declaration. NOW, THEREFORE, KNOW ALL MEN BY THESE PRESENTS that SCE&G hereby declares and covenants on behalf of itself, its successors and assigns, and for any successor in title of the Property, that the Property shown on Exhibit A shall be held, mortgaged, transferred, sold, conveyed, licensed, leased, occupied, and used subject to the following restrictions, which shall touch, concern and run with the title to the Property. 1. Purpose. Notwithstanding the restrictions set forth below, this Declaration is required to maintain the security of the Site, to prevent human exposure to potentially contaminated materials, and to prevent erosion of any potentially contaminated soil, if any, from the Property. 2. No Consumption of Groundwater. SCE&G covenants for itself, its successors and assigns, that groundwater beneath the Property shall not be used by SCE&G for consumptive use or other purposes without prior approval from the EPA. the Department, or their successor agencies and assigns. 3. Use of Property. SCE&G covenants for itself, its successors and assigns, that the Property shall not knowingly or intentionally be used in a manner that would interfere with the remediation of or the post remediation controls employed on the Property, if any, without prior approval from the EPA, the Department, or their successor agencies and assigns. Nothing in this Declaration; however, shall prevent SCE&G from continuing its present uses of the Property. 4. Restricted Uses. SCE&G covenants for itself, its successors and assigns, that the Property shall not be used for residential, agricultural, child day-care facilities, schools, or elderly care facilities nor for recreational purposes without prior approval from the EPA, the Department, or their successor agencies and assigns. 5. Drilling. SCE&G covenants for itself, its successors and assigns, that there shall be no drilling of groundwater wells on the Property, other than groundwater monitoring and 2 N-3 ------- recovery wells only to the extent necessary, without prior approval from the EPA, the Department, or their successor agencies and assigns. 6. Excavation of Soils. SCE&G covenants for itself, its successors and assigns, that there shall be no digging, excavation, grading or other disturbance of any known contaminated soil on or in close proximity to the Property without prior notification to EPA and the Department, and characterization to determine proper management. SCE&G shall characterize, handle and dispose of all contaminated soil material from the Property in accordance with applicable laws, regulations, and guidelines. Nothing in this Declaration shall prevent SCE&G from expanding, upgrading, or modifying its substation facilities located on the Property so long as it remains in compliance with the requirements of this Section 6 of the Declaration. Furthermore, nothing in this Section 6 of this Declaration shall prevent SCE&G, its lessees or licensees, or any third- party provider/owner, from the continued use, repair and/or replacement of any existing utilities or utility related facilities on or in close proximity to the Property, including, but not limited to, power poles; light poles; guy wires; communications handholes. ground systems, conduit and lines: electrical manholes, conduit and conductors; fiber optic conduit and cabling; communications pedestals: water meters and water valves; fire hydrants; irrigation control valves; utility cabinets: or water meters. 7. Limited Access to Property by the EPA and the Department. Subject to the limitations, restrictions, and requirements set forth herein, SCE&G, or its successor in title of the Property, covenants and grants the EPA, the Department, or their successor agencies and assigns, and all other qualified persons performing response actions under the EPA's or the Department's oversight, supervision, and control, any of which shall be deemed an ("Agent") of the EPA or the Department, shall be provided restricted and limited access to the Property for the following limited purposes (i) inspecting the Property, (ii) monitoring the condition of the Property, (iii) verifying information relevant and related to this Declaration, (iv) sampling the soils or ground water beneath the Property, (v) assessing the need for additional quality control practices, (vi) inspecting and copying records as may be permitted pursuant to the terms, conditions, and limitations of the AOC: (vii) assessing any required compliance by SCE&G with the AOC or UAO, or (viii) assessing compliance with the land use restrictions set forth in this Declaration. 8. Restrictions on Access to the Property/Safety Compliance. The EPA, the Department, or their successor agencies and assigns, acknowledge that the Property is currently used as an electrical substation, that there is high voltage use on the Property, and that there are grounding rings and grids below the surface of the Property, all of which, along with other conditions, present extreme safety hazards which can result in the loss of life. Therefore, the EPA, the Department, or their successor agencies and assigns, or any persons acting on their behalf, or under their supervision and control, any of which shall be deemed an ("Agent") of the EPA or the Department, shall enter the Property at their own risk. The EPA and the Department, or their successor agencies and assigns, shall indemnify and hold SCE&G harmless from any personal injuries or 3 N-4 ------- property damage incurred because of such entry into the Property by an Agent of either the EPA or the Department. Under no circumstances shall SCE&G, it successors and assigns, be liable for any injury to person or to property occurring because of an Agents entry into or onto the Property, regardless of the cause of such injury or damage. Also, entry into the Property shall be subject to the following additional limitations and conditions: (i) no Agent may enter the Property without first having received all necessary health and safety training required by SCE&G or any state or federal agency to enter into and perform work in an active electrical substation; (ii) any entry must be arranged and scheduled in advance with SCE&G; (iii) no Agent shall enter the Property without being accompanied by a representative of SCE&G; (iv) all Agents entering the Property shall at all times abide by all rules and regulations of SCE&G regarding entry into and health and safety requirements related to working in an electrical substation; (v) no Agent shall enter the Property without wearing any and all required safety gear which must be supplied by either the EPA or the Department; and (vi) no Agent shall dig into or otherwise disturb the surface of the Property without the prior authorization and written consent from SCE&G as to time, location, and depth. To the extent that any soil disturbance or digging into the surface presents a safety hazard related to the electrical substation, SCE&G may deny the request in its sole discretion. Under no circumstances shall the EPA. the Department, or their successor agencies or assigns, or anyone acting on their behalf, have access to the interior of any building located on the Property, or access to any records or other information owned by any unaffiliated licensee or lessee of any portion of the Property. Declaration Runs with Title. The covenants and restrictions set forth in this Declaration shall run with the title to the Property and shall be binding upon SCE&G, its successors and assigns, and successors in title to the Property. It is expressly agreed that the Department, the EPA, and their successor agencies and assigns, shall have the right to enforce these covenants and restrictions against SCE&G, its successors and assigns, and successors in title to the Property. SCE&G, its successors and assigns, and successors in title to the Property, shall include the following notice on all deeds, mortgages, plats, or any legal instruments used to convey any interest in the Property (failure to comply with this paragraph does not impair the validity or enforceability of this Declaration): NOTICE: This Property is Subject to that certain Declaration of Covenants and Restrictions dated 2018. recorded at the Register of Deeds Office for Charleston County, South Carolina, in Book , at Page on , and any subsequent Amendments thereto. Annual Statement of Compliance. successors and assigns, or successors 4 Beginning in January 2020, SCE&G, its in title to the Property, shall submit to the N-5 ------- Department and the EPA a statement of compliance with this Declaration and the covenants and restrictions as set forth herein, annually on or before January 31st of each year. SCE&G, its successors and assigns, or successors in title to the Property, shall provide one of the following notices in each Report: "The covenants and restrictions applicable to this Property are being properly maintained, and no development or use which is inconsistent with the Declaration of Covenants and Restrictions has occurred since the Effective Date of the Declaration, or since the date of the last annual report," Or, "The covenants and restrictions applicable to this Property arc not being properly maintained," 11. Term/Amendment. This Declaration shall remain in place until such time as the Department has made a written determination that the covenants and restrictions set forth in this Declaration are no longer necessary. This Declaration shall not be amended without the written consent of the Department or its successor agency or assigns. The Department shall not consent to any such amendment or termination without the consent of the EPA and SCE&G, such consent not to be unreasonably withheld. 12. EPA Third-Party Beneficiary. It is expressly agreed that the EPA is not the recipient of a real property interest by virtue of this Declaration, but is a third-party beneficiary of this Declaration and, as such, has the rights of enforcement of its terms and conditions. 13. Reservation of Rights. This Declaration only applies to the Property expressly identified in Exhibit A and does not impair the Department's and the EPA's authority with respect to any other real property owned by SCE&G. N-6 ------- NOTICES AND SUBMISSIONS Whenever, under the terms of this Declaration, written notice is required to be given or any other document is required to be sent by one party to another, it shall be directed at the addresses specified below. As to EPA: Attn: Remedial Project Manager CERCLA Docket No: 98-16-C, Calhoun Park Area Site Superfund Remedial and Site Evaluation Branch Superfund Division United States Knvironmental Protection Agency, Region 4 Atlanta Federal Center 61 Forsyth Street, SAV. Atlanta. Georgia 30303-8960 As to the Department: Attn: Project Manager Federal Remediation Bureau of Land and Waste Management mux 2600 Bull Street Columbia, South Carolina 29201 As to SCE&G: Attn: Director, Environmental Services South Carolina Electric & Gas Company Mail Code C-221 100 SCANA Parkway Cayce, South Carolina 29033 [SIGNATURES TO FOLLOW] 6 N-7 ------- IN WITNESS WHEREOF, SCE&G has caused this Declaration to be executed as of the date first above written. WITNESSES: '4^ SOUTH CAROLINA ELECTRIC & GAS COMP, Name. RojldoJ M .^nQ ¦0<. VP- -SdfA MA A^mift.tArgckoN STATE OF SOUTH CAROLINA COUNTY OF LEXINGTON Its ) ) ACKNOWLEDGEMENT ) _ (Notary Public), do hereby certify that, Tin Bis/her capacity as ^av'\OT l/ite fat#- of South Carolina Electric & Gas Company, personally appeared before me this day and acknowledged the due execution of the foregoing Declaration, on behalf of South Carolina Electric & Gas Company. Witness my hand and official seal this Notary Public for SaA /a QtvrfiAk. My Commission Expires: %7- %% N-8 ------- IN WITNESS WHEREOF, the Department has caused this Declaration to be executed as of the date first above written. WITNESSES: SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL Donald L. Siron. P.d^ Assistant Chief Bureau of Land and Waste Management South Carolina Department of Health and Environmental Control STATE OF SOUTH CAROLINA COUNTY OF RICHLAND -iW\ LfiS "Rkft ACKNOWLEDGEMENT (Notary Public), do hereby certify that, Donald L, Siron. P.O. . Assistant Chief of the Bureau of Land and Waste Management of the South Carolina Department of Health and Environmental Control, personally appeared before me this day and acknowledged the due execution of the foregoing instrument. Witness my hand and official seal this day ofSWfK^J^ , 2018. Notary Public for , >';,• ^, -- - My Commission Expires: \ s.'-.. StateTsoWarollrta N-9 ------- EXHIBIT A SEE ATTACHED BOUNDARY SURVEY OF 1 CHARLOTTE STREET, CITY OF CHARLESTON, DATED JUNE 11, 2018, AND PREPARED BY FORSBERG ENGINEERING AND SURVEYING, INC. FOR SCE&G 9 N-10 ------- .tw ^fisssssr^~" aawiF--"— &sr -—• owt',,ui ~" -"•- «— !EK- I ~J Kww/a///M & a m,.^:£ &«sgr S .-v.. a -7 GRAPHIC SCALE 5 O• jso Is S 15 El III I £ i «- O ; 1 ------- RECORDER'S PAGE NOTE: This page MUST remain with the original document Filed By: SOUTH CAROLINA ELECTRIC & GAS CO. RIGHT OF WAY DEPARTMENT MC CH 29 POST OFFICE BOX 760 CHARLESTON SC 29402 RECORDED Date: November 13, 2018 Time: 11:27:30 AM Book Page DocTvoe \| 0759 \| 782 Rest/Covs I Elaine H. Bozman, Register Charleston County, SC MAKER: SCE&G COAL RECIPIENT: NA Original Book: # of Sats:£ Note: Original Page: # of Pages: j # of References: Recording Fee Extra Reference Cost Extra Pages Postage Chattel TOTAL DRAWER CLERK 11 1000 6.00 16.00 Drawer 4 SLW 0759 Book 782 Page 11/13/2018 Recorded Date I 111 gs Original Book Original Page D Doc Type 11:27:30 Recorded Time 843-958-4800 101 MEETING STREET CHARLESTON, SC 29401 www.charlestoncounty.org N-12 ------- Envir^S^i Contractors File No. 02216661.00 May 31, 2023 Care of Mr. Alex Daniel * East West Hospitality 1671 Belle Isle Avenue, Suite HQ, Office 0 Mt, Pleasant, SC 29464 5 W3 Mr. Chris Stanbery 5 Division of Site Assessment, Remediation, and Revitalization South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 SUBJECT: Annual Statement: Maintenance of the Declaration of Covenants and Restrictions Dear Mr. Stanbery and Mr. Daniel, SCS Engineers (SCS) is pleased to provide you with the 2023 Statement of Maintenance of the Covenants and Restrictions in accordance with VCC 08-5754-NRP (VCC) for The Gadsden condominiums building located along Laurens Street, Concord Street, and Gadsdenboro Street in Charleston, South Carolina (Site). MAINTENANCE OF THE COVENANTS AND RESTRICTIONS At the time of SCS's visual inspection of the Site by Christian Pullano on May 11, 2023, the property includes The Gadsden condominium building is capped with landscaping and asphalt or concrete surfaces which surround the structure. The Site is not being used for any of the purposes prohibited by paragraphs 1 through 8 of the February 2016, Declaration of Covenants and Restrictions. The Site is intact with no disturbance to Site soil or constructed. All storm water drains appear to be free and clear of debris. The parking garage under the building appears unchanged and all asphalt parking surfaces appear undisturbed. The Site is well maintained and has not been altered in any way since the 2022 inspection of the Site. No additional monitoring or remediation has been done since the previous inspection and no new potential sources of contamination were identified. SCS Engineers will continue to inspect the property as needed. If the remedies are maintained, DHEC will not receive further reports until May 31, 2024. If you have any questions, please feel free to contact either of the undersigned at (843) 746-8525. Sincerely, / Portion of the Calhoun Park Area Site in Charleston County, South Carolina, New Tract C-l a Portion of TMS No.458-01-02-063 Voluntary Cleanup Contract #08-5754-NRP Staff Professional SCS ENGINEERS Nina G. Marshtein, PG Project Director SCS ENGINEERS 400 Pierslcie Street, SuOe A North Charleston. South Carolina 29406 ( 8- N-13 ------- Annual Statement: Maintenance of Covenants and Restrictions New Tract C-l a Portion of TMS No. 458-01-02-063 Portion of the Calhoun Park Area Site in Charleston County, South Carolina Voluntary Cleanup Contract #08-5754-NRP Site Visit — May 1 1, 2023 Photograph 1: View of the Site facing west from Concord Street. Photograph 2: View of the south side of the Site facing east along Laurens Street. Page 1 N-14 ------- Annual Statement: Maintenance of Covenants and Restrictions New Tract C-l a Portion of TMS No. 458-01-02-063 Portion of the Calhoun Park Area Site in Charleston County, South Carolina Voluntary Cleanup Contract #08-5754-NRP Site Visit — May 1 1, 2023 Photograph 4: View of undisturbed sidewalks, pavers, and landscaping around the condominium building. Page 2 N-15 ------- Annual Statement: Maintenance of Covenants and Restrictions New Tract C-l a Portion of TMS No. 458-01 -02-063 Portion of the Calhoun Park Area Site in Charleston County, South Carolina Voluntary Cleanup Contract #08-5754-NRP Photograph 6: View of the north side of the Site facing east along Gadsdenboro Street. Photograph 7: View of the parking garage on the ground floor of the building. Page 3 N-16 ------- DocuSigri Envelope ID: 7FQB4D7E-FADB-453B-AA5E-5BB0AC5BFEB2 54475 Email Scanned STATEMENT OF MAINTENANCE OF THE DECLARATION OF COVENANTS AND RESTRICTIONS SC DHEC, Division of Site Assessment, Remediation and Revitalization Bureau of Land & Waste Management 2600 Bull Street Columbia, SC 29201-1708 Please complete the following questionnaire for VCC 08-5754-NRP RB Charleston LLC regarding New Tract A2-1, a portion of the Calhoun Park Area Site. The Property is further identified as New Tract A2-1 located at 7 Calhoun Street, Charleston and Tax Map Serial Number 458-01-02-067, which is a 0.656 acre portion of TMS 458-01-02-028. This Statement should be submitted by May 31st as set forth in the Declaration of Covenants and Restrictions. • Have all restrictions identified in the Declaration been maintained? X Yes No • Are you the current owner of the property that is responsible for maintaining the Restrictive Covenant(s)? X Yes No If not, provide contact information for the new owner on the back of this form or on an additional page. • Have site conditions changed since the contract completion that would affect either a deed restriction or requirements associated with the site? (Examples: a building has been removed; soil has been excavated; or use of the property has changed.) Yes X No Please provide a detailed account of any changes with your completed questionnaire. • Describe the current property use: Vacant land with parking • Has additional monitoring or remediation been done since the contract was completed? Yes X No • Have any new potential sources of contamination been identified? Yes X No Signature, ttuioiL J kais ^ 40//bSb3/B0y4W . Print Name Kenneth I. Krehs Title Authorized Signer Company RR Charleston T.T.C Mailing Address 4124 Worth Avenue, Suite 200 City, Zip Code Columbus, OH 43219 Phone Number 614.246.2400 E-Mail Address kjkr eb s@rockbrid gecapital.coin May 31, 2023 Date File 54475 40 N-17 ------- DocuSign Envelope ID: 7F0B4D7E-FADB-453B-AA5E-5BB0AC5BFEB2 STATEMENT OF MAINTENANCE OF THE DECLARATION OF COVENANTS AND RESTRICTIONS SC DHEC, Division of Site Assessment, Remediation and Revitalization Bureau of Land & Waste Management 2600 Bull Street Columbia, SC 29201-1708 Please complete the following questionnaire for VCC 08-5754-NRP RB Charleston LLC regarding New Tract A2-2, a portion of the Calhoun Park Area Site. The Property is further identified as New Tract A2-2 located at 7 Calhoun Street, Charleston, which is a 1.142 acre portion of TMS 458-01-02-064. This Statement should be submitted by May 31sl as set forth in the Declaration of Covenants and Restrictions. • Have all restrictions identified in the Declaration been maintained? X Yes No • Are you the current owner of the property that is responsible for maintaining the Restrictive Covenant(s)? X Yes No If not, provide contact information for the new owner on the back of this form or on an additional page. • Have site conditions changed since the contract completion that would affect either a deed restriction or requirements associated with the site? (Examples: a building has been removed; soil has been excavated: or use of the property has changed ) Yes X No Please provide a detailed account of any changes with your completed questionnaire. • Describe the current property use: Vacant land with parking • Has additional monitoring or remediation been done since the contract was completed? Yes X No • Have any new potential sources of contamination been identified? Yes 2^— No - DocuSigned by: Signature UmjaxHi, J faaM 4077E8537B09497... Print Name Kenneth I, Krebs Title Authorized Signer Company RB Charleston 1 I P. Mailing Address 4124 Worth Avenue, Suite 200 City, zip Code Columbus, OH 43219 Phone Number 614.246.2400 E-Mail Address kikrebs(a>rockhridgecapital.corn Date May 31, 2023 File 54475 N-18 ------- STATE OF SOUTH CAROLINA ) DECLARATION OF COVENANTS ) COUNTY OF CHARLESTON ) AND RESTRICTIONS THIS DECLARATION OF COVENANTS AND RESTRICTIONS ("Declaration") is made and entered into this day of 2020 by Housing Authority of the City of Charleston, a local government entity (hereinafter referred to as "the City"). RECITALS WHEREAS, The City is the owner of certain real property in Charleston County, South Carolina, more particularly described in Exhibit A attached hereto and incorporated herein by reference ("Property"); and WHEREAS, contaminants in excess of allowable concentrations for unrestricted use remain at the Property; and WHEREAS, the Property is the subject of Voluntary Cleanup Contract 08- 5754-NRP ("VCC") entered into by the South Carolina Department of Health and Environmental Control ("Department") and the City pursuant to the BrownfieldsA/oluntary Cleanup Program, S C. Code Ann. §§ 44-56-710, et seq.. as amended: the South Carolina Hazardous Waste Management Act (SCHWMA), S.C. Code Ann. §§ 44-56-10, et seq., as amended, the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), 42 U.S.C. §§ 9601, et seq., as amended; the State Underground Petroleum Environmental Response Bank Act, (SUPERB Act), S C. Code Ann. §§ 44-2-10, et seq.. as amended; and the Pollution Control Act (PCA), S.C. Code Ann. §§ 48-1-10 et seq.. as amended; and WHEREAS, the terms and conditions of the VCC inure to the City as a Beneficiary and pursuant to Paragraph 11 of the VCC; and WHEREAS, the Property may be used for certain purposes without further remediation in accordance with the conditions of the VCC and in compliance with certain restrictions that are required to be placed on development and use of the Property as set forth in this Declaration, and WHEREAS, The City has agreed to impose restrictions on the manner in which the Property may be developed (said restrictions to run with the land and inure to the benefit of and be enforceable by the Department and its successor agencies); and Declaration of Covenants and Restrictions, Page 1 of 7 Voluntary Cleanup Contract 08-5754-NRP N-19 ------- NOW, THEREFORE, KNOW ALL. PERSONS BY THESE PRESENTS that the City hereby declares and covenants on behalf of itself and its successors that the Property described as Tract C Affordable in Exhibit A shall be held, mortgaged, transferred, sold, conveyed, leased, occupied, and used subject to VCC 08-5754- NRP dated, July 25, 2008 to include the following restrictions, which shall touch and concern and run with the title to the Property. 1. Groundwater beneath the Property shall not be used for any purpose without prior written approval from the Department or its successor agency. 2. The Property shall not be used for the following purposes: residences of any type unless the habitable portion is raised above the surface soil or separated from the surface soil by impervious material, child care or elder care facilities, schools, parks, playgrounds, athletic fields, or agricultural use. 3. Two (2) feet of soil cover ("Soil Cap") was placed on the Property by a previous owner. Following initial redevelopment a water-permeable geotextile barrier shall be maintained over the Soil Cap in landscaped areas not covered by impervious material. 4. The disturbance and handling of the soil on the Property shall be in material compliance with Section 5 ("Soil Management") of the Soil Management Plan, which is attached hereto as Exhibit B and incorporated by reference. 5. The Department or its successor agency, and all other parties performing response actions under the Department's oversight, have an irrevocable right of access to perform and oversee response actions conducted on the property. 6. The covenants and restrictions set forth herein shall run with the title to the Property and shall be binding upon the City and its successors. The City and its successors shall include the following notice on all deeds, mortgages, plats, or any legal instruments used to convey any interest in the Property (failure to comply with this paragraph does not impair the validity or enforceability of these covenants): NOTICE: This Property Subject to Declaration of Covenants and Restrictions recorded on the day of 20 , at Book Page , Officer of the Register of Deeds, and any subsequent Amendments Recorded thereto. Declaration of Covenants arid Restrictions, Page 2 of 7 Voluntary Cleanup Contract 08-5754-NRP N-20 ------- 7. The City and its successors and assigns shall submit to the Department a statement of maintenance of the covenants and restrictions as set forth above on or before May 31s! of every year. 8. This Declaration shall remain in place until such time as the Department has made a written determination that the covenants and restrictions set forth herein are no longer necessary. This Declaration shall not be amended without the written consent of the Department or its successor agency. 9. This Declaration only applies to the Property expressly identified in Exhibit A and does not impair the Department's authority with respect to any other real property under the control of the City. [Remainder of page intentionally left blank] Declaration of Covenants and Restrictions, Page 3 of 7 Voluntary Cleanup Contract 08-5754-NRP N-21 ------- IN WITNESS WHEREOF, HOUSING AUTHORITY OF THE CITY OF CHARLESTON has caused this instrument to be executed as of the date first above written. HOUSING AUTHORITY OF THE CITY OF CHARLESTON WITNESSES: A SOUTH CAROLINA LOCAL GOVERNMENT By: (Name and Title) STATE OF ) ^ ACKNOWLEDGEMENT ) COUNTY OF I, (Notary Public), do hereby certify that, , an authorized representative of the HOUSING AUTHORITY OF THE CITY OF CHARLESTON, personally appeared before me this day and acknowledged the due execution of the foregoing instrument, on behalf of the LOCAL GOVERNMENT Witness my hand and official seal this day of , 20 . Notary Public for My Commission Expires: Declaration of Covenants and Restrictions, Page 4 of 7 Voluntary Cleanup Contract 08-5754-NRP N-22 ------- IN WITNESS WHEREOF, the Department has caused this instrument to be executed as of the date first above written. SOUTH CAROLINA DEPARTMENT OF HEALTH WITNESSES. AND ENVIRONMENTAL CONTROL U - By: Bureau of Land and Waste Management Environmental Quality Control Henry J, Porter, Chief STATE OF <-> ) ACKNOWLEDGEMENT COUNTY OF \| - , I r\G +t^ I. k>i\ ------- EXHIBIT A Declaration of Covenants arid Restrictions, Page 8 of 7 Voluntary Cleanup Contract 08-5754-NRP N-24 ------- ------- EXHIBIT B Declaration of Covenants and Restrictions, Page 7 of 7 Voluntary Cleanup Contract 08-5754-NRP N-26 ------- ENGINEERS SOIL MANAGEMENT PLAN A PORTION OF THE CALHOUN PARK AREA CHARLESTON, SOUTH CAROLINA VOLUNTARY CLEANUP CONTRACT #08-5754-NRP Prepared fori SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL Bureau of Land and Waste Management 2600 Bull Street Columbia, South Carolina 29201 On Behalf Of: EAST WEST CUMBERLAND PARK ASSOCIATES, LLC c/o McNair Law Firm, P.A. 100 Calhoun Street Charleston, South Carolina 29401 Prepared by> SCS ENGINEERS Ashley River Center 2655 Evott Lane, Suite 109 North Charleston, South Carolina 29405 (843) 746-8525 August 28, 2009 Hie No. 02207636.00 OfficM Nationwide www.tcungimMrt.com J^ECEIVEQ AUG 3 1 2009 SITE ASSESSMENT, REMEDIATION & REVITAJJZATION N-27 ------- East West Cumberland Park Associates, Inc. SECTION 1 INTRODUCTION AND BACKGROUND 1.1 INTRODUCTION / Hus SMP regulates subsurface soil disturbance and handling of subsurface soil before, during, and following redevelopment activities at the former Ansonborough Homes Area in downtown Charleston, Charleston County, South Carolina ('"Property'). The Property is the subject of a Voluntary Cleanup Contract, #08-5754-NRP ("VCC}, between the South Carolina Department of Health and Environmental Control ("SCDHEC") and East West Cumberland Park Associates, LLC ("East West"). See Appendix A. This SMP contains procedures designed to (1) protect worker health, and safety during subsurface soil excavation activities; (2) contain impacted subsurface soil; (3) dispose of impacted subsurface soil removed from the Property; (4) ensure adequate soil cap replacement following excavation acti vities; and (5) prevent and respond to unauthorized excavation activities on the Property. For purposes of this SMP, the terms "subsurface soil" or "subsurface" refer to soil located below the two-foot roil cap currently on the Property. 1.2 PROPERTY HISTORY AND PROPOSED REDEVELOPMENT The Property includes two parcels located at the intersection of Calhoun, Concord, Laurens, and Washington Streets and is further defined in the VCC. The Property has been developed with portside businesses, such as a ship building and lumber yards, as well as residences, for over 150 years. A two-foot soil-cap was placed over the Property in 1996 and 1997- Details of the history, prior environmental assesanent, and planned redevelopment of the Property are discussed in the VCC. Additional assessment of the Property was conducted pursuant to the VCC and is documented in the VCC Investigation Report, dated August 1,2008. See Appendix B. On October 7,2008, SCDHEC issued a letter to East West requesting that a SMP be submitted. SCDHEC initially requested that the SMP include a schedule for the placement and maintenance of the additional two feet of soil cover. This request was based solely on East West's proposal to add additional soil cover, however, and the additional soil cover was not required by SCDHEC. SCDHEC also requested the SMP outline personal protection to be taken during redevelopment activities, an explanation of how impacted soil will be contained and, if removed from the Property, disposed. Finally, SCDHEC requested the SMP address the potential for unauthorized/unsolicited excavation activities. This SMP is in response to SCDHEC's letter. The redevelopment of the Property will occur in phases. SCS, in consultation with East U West, prepared this SMP based on current redevelopment plans. This SMP may be revis«yVj in the event material changes to redevelopment plans occur that significantly increase the potential for exposure to impacted subsurface soil. Any revision to this SMP wall be submitted to the SCDHEC for approval prior to implementation. Concord Park 1 Soli Management Plan N-28 ------- East West Cumberland Park Associates, Inc. 1,3 SOIL CAP PLACEMENT AND MAINTENANCE The existing top two feet of the Property is comprised of impoited soil and is considered "clean fill." Redevelopment on the northern portion of the Property (Lot A) is scheduled to begin in late 2010. The redevelopment schedule for the southern portion of the Property (Lot C) has not been finalized. In the meantime, the Property will be covered with grass and stormwater controls will be maintained to minimize surfece erosion, The Property mil be inspected quarterly and washouts or erosion damage will be repaired promptly. A summary of the quarterly soil cap inspections and any repairs will be submitted to SCDHEC by May 31st of each year by SCS Engineers ("SCS") or East West's designee until construction has been initiated on both Lot A and Lot C. RECEIVED MAY - ssn n'~iEC • L'L HEAD OF iand&was^Wqemot Concord Park 2 Soli Management Pta N-29 ------- East West Cumberland Park Associates, Inc. SECTION 5 SOIL MANAGEMENT 5.1 OBJECTIVE The objective of this section is to establish procedures for the management of soil during activities that disturb subsurface soil at the Property, conditions on reuse of soil at the Property, and procedures for the disposal of any soils removed from the Property. 5.1 EXCAVATION AND REDEVELOPMENT ACTIVITIES 5.2.1 Redevelopment Activities SCS concluded that die levels of contaminants identified In the subsurface soils at the Property mil not present a risk to future residents or construction workers. However, soil from the subsurface will be managed in a way that will not cause sediment accumulation la storm water runoff, Le., by either covering stockpiled soO or adhering to the applicable Storm Water Pollution Prevention Pkn. Although project areas have been adequately characterized prior to construction, contaminated soil could be unexpectedly encountered during excavation. The Project Manager, First Res ponder, or sponsoring group representative must notify the Safety Representative and tile Local Owner Representative immediately if suspected contamination is discovered. If contamination is discovered, there will be no differentiation between existing "cap" soils or subsurface soils; therefore, all excavated soils in the area of contamination will be properly disposed off-site. Excavated soil thai is suspected or known to be contaminated wiJl be placed in covered bins or other sealed containers or stockpiled and covered with plastic sheeting. Construction or other work in the affected area shall be stopped, and the affected area shall be cordoned off until an evaluation can be made. 5.2.2 Soil Disposal Following the evaluation of the excavated subsurface soil by the First Responder and when contamination is not detected, excavated subsurface soil may be re-used on the Property in areas below the existing two (2) foot soil cap. Following the evaluation of soil from the cap by the First Reaponder and when contamination is not detected, soil removed from the cap may be reused on the Property. Soil removed from the cap andf} not reused on -site, will be prwperiy characterized and disposed off-site. r"H m CT ZjJ y I Subsurface soil not reused onsite, as allowed in this SMP, shall be properly characterized and disposed off-site. At a minimum, the soil will be disposed at a municipal solid waste landfill. The landfill may require analytical testing of the soil to p£J ^ confirm that constituent concentrations do not exceed the landfill's waste acceptance >_. 6 W. 5 5 All stockpiled soil will be handled in such a way to prevent runoffferosion. Soil QjJ removed from the Property shall not be reused off-site. o w Concord Park 7 Soil Management Pla N-30 ------- East Wgsr Cuniberiand Pork Associates, lag TABLE OF CONTENTS Ssefien Pane Tohlo ®fConf®itSa Slgnohire 1 Introduction and Background — 1 15 ftsj. fb ¦¦ mLai .. ~ ... — ^ l¥l ^ ,n t irtai n Uiil t ««»»• i 1 .3 Soil Cap Placement and Maintenance.... — — ..,..2 2 Exposure Scenarios and Risks ..................................................3 2.1 Exposure Scenarios During Site Redevelopment 2.2 Current Property Conditions and Related Exposure Risks.3 3 Prevention of Exposure to Subsurface Soil 3,1 Personnel Exposure Routes .——, ,— —_„4 32 Personal Protection &yf}pfligyifiimiiiTni.utiiin-riiiiiiiniiiiir-jijfii[- ¦¦ m-uuu-uu i.,,u.iJU,i.i.unn 4 3.3 Engineering Controls . ., .4 34 Toolbox/Safety Meetings —— „.,4 4 Soli Management Plan Logistics 5 Sal! Management ............6 5.1 Objective „ , . — „~™6 5.2 Excavation and Redevelopment Activities... 5.2.1 Redevelopment Acttvltles™ ...,— 5.3 Past Redevelopment Activities.... 5.4 Documentation _ _ 6 UnpsmtEttod/Unseitcifed Sol Excavation Activities .....8 6.1 Before Redevelopment.. 6.2 During Redevelopment „.„8 6.3 After Sfflttyifffnpfman+- 1 r 1.-1„.1-—T. ¦ mi ,„ iS APPENDICES A Voluntary Cleanup Contract, # 08-5754-NRP B Voluntary Cleanup Contract Investigation Report, August 1, 2008 C letter from SCS Engineers to the Soufr Carolina Department of Health and Environmental Control, September 16,2008 N-31 ------- Edit West Cumberland fork Associates, Inc. SIGNATURE PAGE This document, entitled "Soil Management Plan," lias been prepared for a portion of the Concord Park Area site located within the perimeter created by the intereections of Calhoun, Concord, Laurens, and Washington Streets in Charleston, South Carolina at the request of East West Cumberland Park Associates, LLC. It has been prepared in accordance with the guidelines set forth in Voluntary Cleanup Contract #08-5754-NRP. It has been prepared in accordance with accepted quality control practices and has been reviewed by the undersigned. Project Professional SCS ENGINEERS SCPG License #2514 Project Manager SCS ENGINEERS SC PG License # 898 Concord fork Sol I Management Plan II N-32 ------- lost West Cumberland Park Assoeletas, Inc. LIMITATIONS This Soil Management Plan ("SMP") does not cover general health and safety requirements for activities conducted at the subject property. A separate Health and Safety ("H&S") Plan prepared in accordance with applicable requirements, including those of the Department of Labor, Occupational Safety and Health Administration ("OSHA"), may be necessary for such activities. Additionally, this SMP is not intended to address compliance with requirements outside the scope of Vo luntary Cleanup Contract #08-5754-NRR Requirements not addressed by this SMP include land disturbance permitting, stormwafcr peraaitting, and OSHA construction practices. Concord Parle Ift N-33 Soil Management Pia ------- Eoat Wtit Cumberland Porte Assoclntei, lite. SECTION 1 INTRODUCTION AND BACKGROUND 1.1 INTRODUCTION This SMP regulates subsurface soil disturbance and handling of subsurface soil before, during, and following redevelopment activities at the former Ansonborough Homes Area in downtown Charleston, Charleston County, South Carolina ("Property"). Hie Property is the subject of a Voluntary Cleanup Contract, #08-5?54-NRP ("VCC"), between the South Carolina Department of Health and Environmental Control ("SCDHEC") and East West Cumberland Park Associates, LLC ("East West"). See Appendix A. This SMP contains procedures designed to(l) protect worker health and safety during subsurface soil excavation activities; (2) contain impacted subsurface soil; (3) dispose of impacted subsur&ce soil removed from the Property; (4) ensure adequate soil cap replacement following excavation activities; and (5) prevent and respond to unauthorized excavation activities on the Property. For purposes of Ms SMP, the terras "subsurfece soil" or "subsurface" refer to soil located below the two-foot soil cap currently on the Property. 1.2 PROPERTY HISTORY AND PROPOSED REDEVELOPMENT The Property includes two parcels located at the intersection of Calhoun, Concord, Laurens, and Washington Streets and is further defined in the VCC. The Property has been developed with portside businesses, such as a ship building and lumber yards, as well as residences, for over 1 SO years. A two-foot soil-cap was placed over the Property in 1996 and 1997. An additional two-foot cap mil be placed on top ofthe existing cap during redevelopment to raise the Property's base grade elevation. Details ofthe history, prior environmental assessment, and planned redevelopment ofthe Property are discussed in the VCC. Additional assessment of the Property was conducted pursuant to the VCC mid is documented in the VCC investigation Report, dated August 1,2008. Sec Appendix B. On October 7,2008, SCDHEC issued a letter to East West requesting that a SMP be submitted. SCDHEC requested that the SMP include a schedule for the placement and maintenance of the additional two feet of soil cover. SCDIIEC also requested the SMP outline personal protection to be taken during redevelopment activities, an explanation of how impacted soil will be contained and, if removed from the Property, disposed. Finally, SCDHEC requested die SMP address the potential for unauthorized/unsolicited excavation activities. This SMP is in response to SCDHEC's letter. The redevelopment of the Property and the installation of the additional two-foot cap will occur fat phases. SCS, in consultation with East West, prepared this SMP based on current redevelopment plans. This SMP may be revised in the event material changes to redevelopment plans occur that significantly increase the potential for exposure to impacted subsurface soil. Any revision to this SMP will be submitted to the SCDHEC for approval prior to implementation. Concord Park 1 Soil Management Pla N-34 ------- East West Cumberland Parte Aisoclcf », Inc. 1,3 SOIL CAP PLACEMENT AND MAINTENANCE The existing fop two feet of the Property is comprised of imported soil and Is considered "clean fill.* Installation of the additional two foot soil cap on the Property will occur in phases and prior to redevelopment Redevelopment on the northern portion of the Property (Lot A) is scheduled to begin in late 2010. The additional two feet of clean fill rail will be installed on Lot A prior to construction. The redevelopment schedule for the southern portion of the Property (Lot C) has not been finalized; however, the additional two feet of clean soil will be installed prior to construction on that portion of the Property as well. In the meantime, the Property will be covered with grass and stonnwater controls will be maintained to minimize surface erosion. The Properly will be inspected quarterly and washouts or erosion damage will be repaired promptly. A summary of the quarterly soil cap inspections and any repairs will be submitted to SCDHEC by May 31st of each year by SCS Engineers ("SCS") or East West's designee until construction has been initiated on both Lot A and LotC. Concord Pork 2 N-35 Soil Management Plan ------- Boat Wett Cumberland Pork Associates, lac* SECTION a EXPOSURE SCENARIOS AND RISKS 3.1 EXPOSURE SCENARIOS DURING SITE REDEVELOPMENT The first exposure scenario would apply following the purchase of the Property by East West and until construction begins there. Tbe Property will remain vacant daring this period. The existing soil cap is snCRcteat to prevent exposure of intermittent workers and trespassers to the underlying soil, and the risk assessment conducted by SCS Engineers Indicates the levels of PAHs detected in the existing cap would not pose a risk even to daily site workers over a three (3) month period. The second exposure scenario applies only to site workers during disturbance of subsurface soil. The risk af exposure to workers would exist during construction of site foundations and installation of subsurface utilities or other subsurface work. Soil removed from the cap does not require special management other than ensuring it is not commingled with contaminated soil and, where appropriate, is replaced. When construction does extend beneath the soil cap, the extremely shallow water table will likely create conditions unsuitable for workers to enter the trenches. Therefore, there appears to be minimal exposure opportunity to the soil beneath the soil cap, unless it is stock-piled on site. Soil management is discussed in Section 5, The third exposure scenario occurs when the Property is completely redeveloped. The Property will be developed with muitifamily residential and commercial uses. The development pirns do not include residential space at ground level. Over ninety percent of the surface will be covered with either pavement or structures and the balance will have non-native, clean soil for landscaping brought in from outside sources. A distinct, water- permeable geotextile will he placed beneath dean fill installed within landscaped areas and will serve as an exposure harrier to the older soil cap and subsurface soils. Site occupants will not be exposed to the subsurface soil and will not have a route of access to subsurface soil or site groundwater. Groundwater will not be used for any purpose at the Property, and all water wall be provided by the City of Charleston. Therefore, no known risk of exposure exists to site occupants following redevelopment. Hie fourth exposure opportunity is through unauthorized or unsolicited subsurface penetration below die soil cap (Le. drilling or excavation). Unauthorized or unsolicited activities, especially after redevelopment has been initiated, would not be expected to last more than one or two days before being discovered and stopped. Therefore, based on die risk assessment conducted for the Property, any significant exposure is considered unlikely under this scenario. 2.2 CURRENT PROPERTY CONDITIONS AND RELATED EXPOSURE RISKS Analytical results documented in the VCC Investigation Report dated August 1,2008, and related exposure risks are discussed in SCS* correspondence to SCDHEC dated September 16,2008. See Appendix C. SCS concluded that the levels of contaminants identified in the subsurface soil at the Property will not present a health risk to future residents or construction workers. Concord Pork 3 Soli Managsmont Pla N-36 ------- East West Cumberlond Pork Associates, Inc. SECTION 3 PREVENTION OP EXPOSURE TO SUBSURFACE SOILS 3.1 ratSONNR, EXPOSURE ROUTES The primary exposure route to contaminated soils is through ingestion, specifically through hand-to-mouth contact. Therefore, personal protective equipment (PPE) and engineering controls must be used by construction workers to limit exposure to subsurface soil through ingestion. This SMP identifies the minimum PPE and engineering controls necessary to prevent such exposure. 3.2 PERSONAL PROTECTION EQUIPMENT Based upon the low concentrations of constituents detected at the Property, this SMP requires Level D PPE for workers who are expected to come into contact with subsurface soil. See NIOSH/OSHA USCG/cmd the EPA Occupational-Safety and Health Guidance Manualfar Hazardous Waste Site Activities, October 1985; See also, EPA Standard Operating Safely Guides, Publication 9285.1-03, dated June 1992. Level D protection is appropriate for conditions where de minimis levels of contamination exist. Level D protection is primarily a work uniform (i.e., coveralls) and safety shoes/boots. Other PPE (e,g., gioves, safety glasses, etc.) may be appropriate depending on assigned tasks. 3.3 FIRST RESPONDS A person who has completed "Hazardous Materials First Responded Awareness (Level 1)" 8-hour training (First Responder) will be present daring disturbance of subsurface soils. Hazardous Materials First Responder Training includes instruction on 29 CFR 1910.120 and the National Fire Protection Association Standard for Competence of Rcspondcrs to Hazardous Materials Incidents (NFPA 472). This training will enable the First Responder to identify hazardous materials that may be discovered on site and to detect and identify such materials from a safe distance using sight and odor. Responsibilities of the First Responder include: • The First Responder will have knowledge of and understand the nature of contaminants found within the Calhoun Park Area Site which include polyouelear aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs) associated with creosote, coal tar, and other petroleum-based products. • The First Responder will observe all activities which disturb subsurface soils for physical evidence of contamination. Physical evidence for the presence of the above referenced contaminants includes discolored oil stringent odors, and viscous product within the soiL • The First Responder will notify the Safety Representative and the Local Owner Representative immediately if suspected contamination is discovered. . Excavated soil that is suspected or knows to be contaminated will he placed in covered bins or other sealed containers or stockpiled and covered with plastic sheeting. Concord Pork 4 Soil Management P la N-37 ------- Eaat Watt Cumberland Park Anoctof 1, Inc. • Construction or other work in the affected area shall be stopped, and the affected am shall be cordoned off until an evaluation can be made. 3.4 SNGINEERIN6 CONTtOU For purposes of tills SMP, the following engineering controls shall be used in areas where parsons are expected to come in contact with subsurface soil, 3.5 SIGNAGE Appropriate signage shall be posted at each entry/exit of titese areas; 1. No tobacco use in the work area. 2. No eating or drinking in the work area. 3. Required hand-washing upon exiting work area and prior to eating, drinking, or tobacco use by persons exiting the work area. 14 TOOUOX/&AHTT MIITOMS Required PPG and the need to avoid hand-to-mouth contact with subsurfece soil shall be discussed with construction workers during toolbox/safety meetings associated with subsurface soil excavations. Concord Park 5 N-38 Sotl Management Pie ------- Eoit West Cumberland Pork Asioclates, Inc. SECTION 4 SOIL MANAGEMENT PLAN LOGtSTiCS Contacts have been established to maintain the integrity of the soil management activities for tile Property. Hie contacts are: Rtgnletoiy Ms. lo Cherie Overcash SCDHEC Bureau of Land and Waste Management 2600 Bull Street Columbia, South Carolina 29201 (803) 896-4019 L«eof Owner Repraisntativs Mr. Ross Bowker East West Cumberland Park Associates c/o Donald Furtado, Esq. McNair Law Finn, PA. 100 Calhoun Street Charleston, South Carolina 29405 (843) 723-7831 SCDHEC shall notify the Local Owner Representative and Safety Representative if SCDHEC's contact information changes. Should revisions to the above-referenced contact information be necessary, SCS or East West's designee shall revise this page of the SMP and submit it to SCDHEC. Local Regulatory Ms. Christine Sanford Coker SCDHEC Trident EQC Office 1362 McMillan Avenue, Suite 300 North Charleston, South Carolina 29405 (843)740-1590 Sofoty R$pros6nfstiv® Ms. Nina Marehtein, PG SCS Engineers 26SS Evatt Lane, Suite 109 North Charleston, South Carolina 29405 (843)746-8525 Concord Pork 6 N-39 Soil Mona8*(nen» Plo ------- laif West CumbTlond Park A»»oclot«». Inc. SECTION 5 SOIL MANAGEMENT 5.1 OBJECTIVE The objective of flils section is to establish procedures for the management of soil daring activities that disturb subsurface soil at the Property, conditions on reuse of soil at the Property, and procedures for the disposal of any soils removed from the Property. S.I EXCAVATION AND REDEVELOPMENT ACTIVITIES 5.2.1 Redevelopment Activities SCS concluded that the levels of contaminants identified in the subsurface soils at the Property will not present a ride to future residents or construction workers. However, soil from the subsurface will be managed in a way that will not cause sediment accumulation in storm water runoff, Le., by either covering stockpiled soil or adhering to the applicable Storm Water Pollution Prevention Plan. Although project areas have been adequately characterized prior to construction, contaminated soil could be unexpectedly encountered during excavation. The Project Manager, First Respocder, or sponsoring group representative must notify the Safety Representative and the Local Owner Representative immediately if suspected contamination is discovered. If contamination is discovered, there will be no differentiation between existing "cap" soils or subsurface rails; therefore, all excavated soils in the area of contamination will be properly disposed off-site. Excavated soil that is suspected or known to be contaminated will be placed in covered bins or other scaled containers or stockpiled and covered with plastic sheeting. Construction or other work in the affected area shall be stopped, and the affected area shall be cordoned off until an evaluation cm be made. 5.2.2 Soil Disposal Following the evaluation of the excavated subsurface soil % the First Responder and when contamination is not detected, excavated subsurface may be re-used on the Property in areas below the existing two (2) foot soil cap. Following the evaluation of soil from the cap by the First Responder and when contamination is not detected, soil removed from the cap may be reused on the Property. Soil removal from the cap and not reused on-site, will be properly characterized and disposed off-site. Snbsurfiace soil not reused onsite, as allowed in this SMP, shall be properly characterized and disposed off-site. At a minimum, the soil win be disposed at a municipal solid waste landfill. The landfill may require analytical testing of the soil to confirm that constituent concentrations do not exceed the landfill's waste acceptance criteria. All stockpiled soil will be handled in such a way to prevent runoff/erosion. Soil removed from the Property shall not be reused off-site. Concord Pork 7 Sol! Management Plan N-40 ------- Eoit Wait Cumberland Park Anoclotei, Inc. 5.3 POST REDEVELOPMENT ACTIVITIES Once excavation activities have been completed, the soil cap will be re-established, to the extent possible, to prc-cxcavation elevation with either the original cap material or with new clean fill. The SMP shall continue to be enforced for all post-redevelopment activities that disturb subsurface soil Such activities include landscaping work which may result in contact with soils beneath the geotextile barrier. Where such contact may occur, the entity charged with enforcing this SMP will advise the landscape to comply with the SMP In die event the geotextile barrier is breached. 5.4 DOCUMENTATION A Soil Excavation Report (SBR) documenting excavation and soil disposal activities at the Property during redevelopment shall be completed and submitted to SGDHEC by SCS or East West's designee within SO days of completion of all redevelopment activities at the Property. The SER may be submitted earlier if ail planned excavations at the Property have been completed. Excavations where less than five cubic yards of subsurface soil are removed shall be considered de minimis for documentation purposes and are not required to be included in the SER. At a minimum, the SER will include: • Subsurface soil excavation dates, • Subsurface soil excavation contractor information (i.eM name, address, telephone number) • Estimated volume of subsurface soil removed and disposed off-site » Siie diagram depicting areas of subsurface soil disturbance • Unpermitted or unsolicited subsurface soil excavations occurring during redevelopment • Laboratory data (if applicable) from subsurface soil samples If subsurface soil was removed from the Property, the following information will also be provided: • Willi n HIM II Mii M ¦ mmJI fit ifiiT.ni 111 in i ransporter nains ana axiufess • Name and address of landfill where the subsurface soil was disposed ¦ Non-Hazardous Waste Manifests • Load tickets Hie SER will also provide any recommendations for further action. If laboratory analysis is conducted on subsurface soils at the Property during redevelopment and concentrations exceed the standard calculated for the Baseline Report, SCS will calculate Site Specific Limits for exposure period. SCS or East West's designee shall submit such analytical data to SCDHEC within 30 days of receipt Concord Pork 8 Soil Monogeffltnt Plan N-41 ------- East Wesr Cumberland Port Anoelotoi, Inc. SECTION 6 UNPERMITTED/UNSOLICITED SOIL EXCAVATION ACTIVITIES 6.1 BEFORE REDEVELOPMENT Prior to redevelopment, SCS or East West's designee will inspect the Property regularly to determine if unpermitted or unsolicited soil excavation has occurred. If an unpermitted or unsolicited activity is suspected, SCS or East West's designee will attempt to identify the entity responsible for the activity and to track the soil if removed from the Property. Since the Property may continue to be used as a public park prior to redevelopment, it is unlikely that unpermitted or unsolicited soil excavation will occur prior to redevelopment In order to minimize the risk of unpermitted or unsolicited excavation, a sip will be posted on the Property requiring SCS or East West's designee be contacted prior to any excavation. Phone numbers for SCS or East West's designee will be provided on the signs. SCS or East West's designee will also notify the Commission of Public Works of die City of Charleston and South Carolina Electric and Gas after closing on the Property and inform them that no excavation is to take place at the Property without written permission from East West. 6.2 DURING REDEVELOPMENT During redevelopment activities, workers will be present, and we do not anticipate unpermitted or unsolicited soil excavation to occur. However, any unpermitted or unsolicited subsurface soil excavation occurring during redevelopment will be documented intheSER. 6.3 AFTER REDEVELOPMENT Upon completion of redevelopment, over ninety percent of the Property's surface will be covered with either pavement or structures and the balance will be landscaped. The only opportunity for unpermitted or unsolicited soil excavation would likely be limited to weak by utilities. The low concentrations of constituents detected in the soil at the Property and the risk calculations included in Appendix C indicate exposure risks to workers conducting such work would be insignificant Concord Park 9 Soil Management P!on N-42 -------


FOURTH FIVE-YEAR REVIEW REPORT FOR
CALHOUN PARK AREA SUPERFUND SITE
CHARLESTON COUNTY, SOUTH CAROLINA

a rnA

otrA

August 2024

Prepared for

U.S. Environmental Protection Agency
Region 4
Atlanta, Georgia

CAROLINE
FREEMAN

Digitally signed by CAROLINE
FREEMAN

Date: 2024.08.29 15:12:41 -04'00'

Caroline Y. Freeman, Director

Superfund & Emergency Management Division

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11

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e of Contents

LIST OF ABBREVIATIONS & ACRONYMS	vii

I.	INTRODUCTION	1

Site Background	1

Five-Year Review Summary Form	3

II.	RESPONSE ACTION SUMMARY	3

Basis for Taking Action	3

Response Actions	5

Status of Implementation	12

Institutional Controls (IC)	15

IC Summary Table	17

Systems Operations/Operation and Maintenance (O&M)	19

III.	PROGRESS SINCE THE LAST REVIEW	19

Other Findings	22

IV.	FIVE-YEAR REVIEW PROCESS	23

Community Notification, Involvement & Site Interviews	23

Data Review	24

Site Inspection	30

V.	TECHNICAL ASSESSMENT	31

QUESTION A: Is the remedy functioning as intended by the decision documents?	31

QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels and RAOs used at the

time of the remedy selection still valid?	32

QUESTION C: Has any other information come to light that could call into question the
protectiveness of the remedy?	33

VI.	ISSUES/RECOMMENDATIONS	34

Other Findings	34

VII.	PROTECTIVENESS STATEMENT	36

VIII.	NEXT REVIEW	37

APPENDIX A-REFERENCE LIST	A-l

APPENDIX B - CURRENT SITE STATUS	B-l

APPENDIX C - SITE CHRONOLOGY	C-l

APPENDIX D - PRESS NOTICE	D-l

APPENDIX E - SITE MAPS	E-l

APPENDIX F - INTERVIEW FORMS	F-l

APPENDIX G - SITE INSPECTION CHECKLIST	G-l

APPENDIX H - DETAILED ARARs REVIEW	H-l

APPENDIX I - TOXICITY ASSESSMENT	1-1

APPENDIX J - SHALLOW GROUNDWATER DATA	J-l

APPENDIX K - INTERMEDIATE GROUNDWATER DATA	K-l

APPENDIX L - DNAPL DATA	L-l

APPENDIX M- SITE PHOTOGRAPHS	M-l

APPENDIX N - INSTITUTIONAL CONTROL INSTRUMENTS	N-l

ill

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es

Table 1: COCs by Media	5

Table 2:1998 ROD Established Remediation Goals for OU-1	8

Table 3:1998 OU-1 ROD Soil PRGs	9

Table 4: 2002 OU-2 ROD Intermediate Groundwater COC Cleanup Goals	11

Table 5: Summary of Planned and/or Implemented Institutional Controls	17

Table 6: Protectiveness Determination/Statements from 2019 FYR	20

Table 7: Status of Recommendations from 2019 FYR	21

Table C-l: Site Chronology	C-l

Table H-l: Chemical Specific ARARs	H-2

Table H-2: Location Specific ARARs	H-3

Table H-3: Action Specific ARARs	H-3

Table H-4: Groundwater ARAR Review	H-4

Table 1-1: Review of Groundwater Cleanup Goals	1-1

Table 1-2: Vapor Intrusion Evaluation - From April 2019 to April 2023 	1-2

Table 1-3: Review of Soil Cleanup Goals - Commercial	1-3

Table 1-4: Review of Soil Cleanup Goals - Residential	1-3

Table 1-5: Review of Sediment Cleanup Goals	1-4

Table J-l: Shallow Groundwater Monitoring Locations	J-2

Table J-2: Summary of Groundwater Analytical Parameters and Methods	J-3

Table J-3: Benzene Historical Analytical Results - Aqueous Plume Wells	J-4

Table J-4: Naphthalene Historical Analytical Results - Aqueous Plume Wells	J-5

Table J-5: Summary of Historical Shallow Groundwater Quality Data	J-8

Table J-6: Summary of Historical Shallow Groundwater Quality Data	J-15

Table J-7: Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL	J-20

Table K-l: Intermediate Sand Unit Groundwater Monitoring Wells	K-2

Table K-2: Analytical Parameters and Methods for Intermediate Groundwater Monitoring Program.. K-3
Table K-3: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent

List from September 2022 	K-8

Table L-l:Cumulative Total of DNAPL Recovered	L-2

Table L-2: Summary of DNAPL Shipments from January 2000 to May 2023	L-3

Table L-3: Apparent DNAPL Thickness Monitoring Schedule	L-4

Table L-4: Average Monthly DNAPL Removed Compared to Total Removal Events	L-ll

Table L-5: Evaluation and Interpretation of Removal Trends forTrench DNAPL Recovery Wells	L-12

Table L-6: Summary of Apparent DNAPL Thickness in Wells and Averages	L-13

Table L-7: DNAPL Volume Removed 6-Month Comparison	L-14

Table L-8: MW-12A DNAPL Measurements and Pumping Activity	L-18

iv

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Figures

Figure 1: Institutional Controls Map	18

Figure E-l: Site Location Map	E-2

Figure E-2: Historical Site Map (Source: Management and Technical Resources, Inc.)	E-3

Figure J-l: Shallow Groundwater Sampling Locations	E-6

Figure J-2: Average Benzene and Naphthalene Concentrations with Time from Aqueous Plume Wells -

LM-01AR, LM-02A, MM-02A, MM-03A, MRW-01, MRW-02, & MZ-02AR	J-7

Figure J-3: Historical Benzene Groundwater Analytical Results Through May 2023	J-18

Figure J-4: Historical Naphthalene Groundwater Analytical Results Through May 2023	J-19

Figure J-5: Shallow Groundwater Monitoring Wells with Intermittent Trace Amounts of DNAPL	J-22

Figure J-6: Illustrations of Benzene Concentrations from January 1994 to May 2023 	J-23

Figure J-7: Illustrations of Naphthalene Concentrations from January 1994 to May 2023	J-24

Figure K-l: Intermediate Groundwater Monitoring Locations	K-4

Figure K-2: Historical Benzene and Naphthalene Analytical Results in Upper Intermediate Sand Unit

from 2000 to 2022	K-5

Figure K-3: Historical Benzene and Naphthalene Analytical Results Middle Intermediate Sand Unit from

1999 to 2022	K-6

Figure K-4: Historical Benzene and Naphthalene Analytical Results Lower Intermediate Sand Unit from

1994 to 2022	K-7

Figure K-5: Apparent DNAPL Thickness - Intermediate Sand Units (December 2019)	K-24

Figure K-6: Apparent DNAPL Thickness - Intermediate Sand Units (December 2020)	K-25

Figure K-7: Apparent DNAPL Thickness - Intermediate Sand Units (November 2021)	K-26

Figure K-8: Apparent DNAPL Thickness - Intermediate Sand Units (December 2022)	K-27

Figure L-l: DNAPL Recovery Volumes by Segments (from 2002 to 2023)	L-5

Figure L-2: DNAPL Recovery Trends with Time	L-6

Figure L-3: DRW-06 Historical Monthly Volume Removed and Apparent DNAPL Thickness	L-7

Figure L-4: DRW-06 Total DNAPL Volume Removed from March 2001 to May 2023 	L-8

Figure L-5: Total DNAPL Volume Removed During 6-Month Reporting Periods	L-9

Figure L-6: Total DNAPL Volume Removed by Month	L-10

Figure L-7: Average Monthly Volume Removed and Total Removal Events During 6-Month Reporting

Periods	L-15

Figure L-8: Plot of Average DNAPL Manually Removed per Removal Event Versus Time	L-16

Figure L-9: Linear Plot of Volume Removed Versus Time for Winter Months	L-17

v

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Site Photographs

Site Photograph M-l: DESC 1/2 Charlotte Street Substation Entrance	M-l

Site Photograph M-2: DESC Substation (east to west)	M-2

Site Photograph M-3: Middle of DESC Substation (from southeast to northwest)	M-2

Site Photograph M-5: Calhoun Park Area (from parking garage east towards the Cooper River)	M-3

Site Photograph M-4: DESC Substation (from top of parking garage towards the Ports Authority)	M-3

Site Photograph M-7: Cooper River (from Charlotte Street Park Irish Memorial south)	M-4

Site Photograph M-6: Calhoun Park Area (from parking garage south towards Gadsdenboro Park) ...M-4

Site Photograph M-8: DRW-35	M-5

Site Photograph M-9: DRW-33	M-6

Site Photograph M-10: DRW-6 (555th drum)	M-7

Site Photograph M-ll: BM-03D (Located in Parcel 4591304005)	M-8

vi

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LIST OF ABBREVIATIONS & ACRONYMS

AR

Administrative Record

ARAR

Applicable or Relevant and Appropriate Requirement

BTEX

Benzene, Toluene, Ethylbenzene and Xylene

CERCLA

Comprehensive Environmental Response, Compensation, and Liability Act

CFR

Code of Federal Regulations

CIC

Community Involvement Coordinator

COC

Contaminant of Concern

DESC

Dominion Energy South Carolina

DNAPL

Dense Non-Aqueous Phase Liquid

EPA

United States Environmental Protection Agency

ESD

Explanation of Significant Differences

ESGTU

Equilibrium Partitioning Sediment Guideline Toxicity Unit

FYR

Five-Year Review

HQ

Hazard Quotient

IC

Institutional Control

Hg/L

Micrograms Per Liter

Hg/m3

Micrograms Per Cubic Meter

mg/kg

Milligrams per Kilogram

mg/L

Milligrams per Liter

MDL

Minimum Detection Limit

MCL

Maximums Contaminant Level

MW

Monitoring Well

NCP

National Contingency Plan

NPL

National Priorities List

NPS

National Park Service

O&M

Operation and Maintenance

OU

Operable Unit

PAH

Polycyclic Aromatic Hydrocarbon

PRP

Potentially Responsible Party

RAO

Remedial Action Objective

Rl

Remedial Investigation

RL

Reporting Limit

ROD

Record of Decision

RPM

Remedial Project Manager

RSL

Regional Screening Level

RV

Recreational Vehicle

SCDHEC

South Carolina Department of Health and Environmental Control

SCE&G

South Carolina Electric & Gas Company

SVOC

Semivolatile Organic Compound

USGS

United States Geological Survey

UU/UE

Unlimited Use and Unrestricted Exposure

VISL

Vapor Intrusion Screening Level

VOC

Volatile Organic Compound

WQC

Water Quality Criteria

vii

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I. INTRODUCTION

The purpose of a five-year review (FYR) is to evaluate the implementation and performance of a
remedy to determine if the remedy is and will continue to be protective of human health and the
environment. The methods, findings, and conclusions of reviews are documented in FYR reports such
as this one. In addition, FYR reports identify issues found during the review, if any, and document
recommendations to address them.

The U.S. Environmental Protection Agency is preparing this FYR pursuant to the Comprehensive
Environmental Response, Compensation, and Liability Act (CERCLA) Section 121, consistent with the
National Contingency Plan (NCP)(40 Code of Federal Regulations (CFR) Section 300.430(f)(4)(ii)), and
considering EPA policy.

This is the fourth FYR for the Calhoun Park Area Superfund site (the Site). The triggering action for this
statutory review is the completion date of the previous FYR. The FYR has been prepared because
hazardous substances, pollutants or contaminants remain at the Site above levels that allow for
unlimited use and unrestricted exposure (UU/UE).

The Site consists of two operable units (OUs), both of which are addressed in this FYR. OU-1 addresses
soil, dense nonaqueous phase liquid (DNAPL) and shallow groundwater. OU-2 addresses intermediate
groundwater, surface water and sediment in the Cooper River.1

The South Carolina Department of Health and Environmental Control (SCDHEC) conducted the FYR and
prepared this report regarding the remedy implemented at the Site. The SCDHEC personnel conducted
this review from October 2023 to March 2024. The EPA is the lead agency for developing and
implementing the remedy for the cleanup at the Site. The relevant entity, Dominion Energy South
Carolina, Inc.2 (DESC) was notified of the initiation of the FYR. The review began on October 23, 2023.

Site Background

The Site is located on the peninsula of Charleston, South Carolina. From 1855 to 1957, a manufactured
gas plant operated on site and produced coal tar as a byproduct of the manufacturing process. Plant
operations contaminated area soil, groundwater, and sediment. The Site includes areas affected by
manufactured gas plant operations, which include an electrical substation property, a large parking
garage, National Park Service (NPS) property (which includes the Fort Sumter Tour Boat facility and
Liberty Square), the Irish Memorial at Charlotte Street Park, the South Carolina Aquarium, former
Luden's Marine property, the former Ansonborough Homes housing project (which now includes
Gadsdenboro Park) and capped sediment areas in the Cooper River (Figure 1 and Figure E-l in

1 The 2002 OU-2 Record of Decision (ROD) determined that surface water required no additional action to protect public
health and the environment because of previous response actions.

2 SCE&G is the official PRP and is a subsidiary of SCANA. Dominion Energy purchased SCANA in January 2019.
SCE&G's name changed to Dominion Energy South Carolina, Inc. (DESC) on April 15, 2019, but SCANA still exists.

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Appendix E). Site surroundings include commercial, industrial, and residential developments. The
Cooper River borders the Site to the east. The original plant operated on the location of the electrical
substation, which is now in use by DESC.

The Site is in an area of filled tidal creek channels and fill placed along the Cooper River shoreline. The
following geological units are under the Site: fill material/upper sand, upper clay, upper intermediate
sand, middle intermediate sand, lower intermediate sand, and the Ashley Formation of the Cooper
Group. Shallow groundwater at the Site is in the fill material/upper sand; intermediate groundwater is
in the interval between the upper clay and deeper Ashley Formation. The upper clay unit is relatively
shallow (about 10 feet below ground surface) and generally serves as a unit of lower permeability.

However, there are some permeable areas in the upper clay, and the clay was likely breached during
installation of the gas holder on the electrical substation property.3 Therefore, the DNAPL source areas
are mostly in the shallow aquifer, but DNAPL is also observed in the intermediate aquifer.

Drinking water in the area is supplied by the City of Charleston, which uses an upgradient surface water
supply that is not influenced by the Site. Groundwater near the Cooper River is saline or brackish. The
Cooper River is used for recreational fishing.

Appendix A provides a list of references used during this FYR. Appendix B provides detailed site status
information. Appendix C provides a chronology of site events.

3 The former gasholder is a circular, subsurface structure with walls constructed of 1-inch thick steel and cemented brick, a
wooden floor and an interior filled with debris and soil.

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Five-Year Review Summary Form

SITE IDENTIFICATION

Site Name:

Calhoun Park Area



EPA ID:

SCD987581337



| Region: 4

State: SC

City/County: Charleston/Charleston County

SITE STATUS

NPL Status: Non-NPL

Multiple OUs?

Yes

REVIEW STATUS

Lead agency: EPA
Author name: Allan Hernandez (EPA) and Timothy Kadar (SCDHEC)

Author affiliation: EPA and SCDHEC
Review period: 10/23/2023 - 8/15/2024
Date of site inspection: 2/14/2024
Type of review: Statutory
Review number: 4
Triggering action date: 8/15/2019

Due date (five years after triggering action date): 8/15/2024

II. RESPONSE ACTION SUMMARY

Basis for Taking Action

Before the 1998 remedial investigation (Rl), several environmental investigations were performed on
parts of the Site, including the former Ansonborough Homes, Calhoun Park (now the location of the
on-site parking garage) and the Cooper River.4 In 1992, the Site received a Hazard Ranking System

4 Preliminary investigations conducted in the early 1990s for the former Ansonborough Homes property were used to inform
the remedy selection process. As the property was included in initial investigations, it is considered part of the Site. However,

Has the site achieved construction completion?

Yes

3

-------
score sufficient for National Priorities List (NPL) listing, but listing was suspended based on cooperation
by SCE&G (the PRP). Site cleanup was conducted under an alternative approach. In January 1993,
SCE&G entered into an Administrative Order with the EPA to perform an Rl.

Evaluation of human health risk associated with the Site is discussed in the 1994 Baseline Risk
Assessment by Black & Veatch, the 1995 Assessment of Risk for the National Park Service Property by
the EPA, and the 1996 Revision to the Risk Assessment by the EPA. For OU-1, the risk evaluation for
commercial workers and future residential populations resulted in unacceptable risk levels associated
with soil and groundwater. Risks under the construction worker and long-term worker scenarios were
largely driven by incidental ingestion and/or dermal contact with surface and subsurface soils. The risk
under the future resident scenario was driven primarily by exposure to shallow groundwater.

For OU-2, the potential carcinogenic risks associated with exposure to intermediate groundwater by a
hypothetical child or adult resident exceeded the EPA target cancer risk range. Similarly, potential
noncarcinogenic risks associated with exposure to intermediate groundwater by a hypothetical child or
adult resident exceeded a hazard index of 1.0. The risk from human exposure to sediment was not
evaluated because human exposure to sediment was deemed unlikely. Sediment presented ecological
risks from polycyclic aromatic hydrocarbons (PAHs) with hazard quotients (HQs) based on the EPA's
equilibrium partitioning sediment guideline toxicity units (ESGTUs) above 1. At the time of the 2002
OU-2 Record of Decision (ROD), about 70 percent of the area with ESGTU HQs equal to or greater than 1
was covered by permanent structures and previously installed sand blankets, which reduced but did
not eliminate the direct contact pathway for ecological exposures. Contaminants of concern (COCs) are
included by media in Table 1 below.

based on investigation findings, no remedy was selected for the former Ansonborough Homes property. Because preliminary
investigations identified some contamination associated with former wood treating activities, SCDHEC manages the former
Ansonborough Homes property under the authority of SCDHEC's Voluntary Cleanup Program.

-------
Table 1: COCs by Media

COCs

Media

Arsenic

Groundwater and Soil

Benzo(a)pyrene

Groundwater and Soil

Cyanide

Groundwater

Benzene

Groundwater

2,4-Dimethylphenol

Groundwater

Ethyl benzene

Groundwater

Beryllium

Groundwater

Lead

Groundwater

Carbazole

Groundwater

Mercury

Groundwater

Chrysene

Groundwater

Naphthalene

Groundwater

Chromium

Groundwater

Nickel

Groundwater

Copper

Groundwater

Toluene

Groundwater

Xylenes (total)

Groundwater

PAHs

Sediment

Sources: 1998 ROD Section 7.1. 1 and 7. 1.2 anc

2002 ROD Table 8-1 and Section 8.2

Response Actions

Pre-ROD

To support site redevelopment construction activities, several early cleanup actions were
conducted before final remedy selection for OU-1. These actions included installing several
sediment containment structures (such as sand blankets to minimize the resuspension of
contaminated sediment during area redevelopment), addressing contaminated stormwater
discharges (by upgrading a Calhoun Street storm drain that had been transporting contaminants
from the Site to the Cooper River, resulting in contaminated sediment, and installing a
subsurface sheet piling wall to prevent the new drain from acting as a preferential pathway for
groundwater to the river), and investigating and responding to an oily sheen and seeps
observed on the river at the end of Charlotte Street (by using absorbent booms and
investigating the coal tar seeps). The 1998 OU-1 ROD includes additional details regarding
those actions.

Post-ROD

The EPA selected the Site's remedies in the 1998 OU-1 ROD, the 2005 OU-1 Explanation of
Significant Differences (ESD), and the 2002 OU-2 ROD. OU-1 addresses DNAPL source areas,
shallow groundwater contamination and soil. The DNAPL source areas were identified as the

5

-------
former gas holder, the former rail spur, and the former oil tanks (see Figure E-2 in Appendix E for
a historical site map). The DNAPL source areas are mostly in the shallow aquifer, though DNAPL is
also observed in the intermediate aquifer.

6

-------
Operable Unit 1

The 1998 OU-1 ROD included the following remedial action objective (RAO) for soil:

Ensure soil exposure concentration levels are adequately protective forfuture
construction workers and long-term workers.

The 1998 OU-1 ROD noted that the while the goal of the remedy is to restore groundwater to
Maximum Contaminant Levels (MCLs), restoration to MCLs may be technically impracticable.
Therefore, the ROD stated that the shallow groundwater/DNAPL remedy shall at a minimum
achieve the following:

Source areas:

o Removal or treatment of DNAPL to the maximum extent practicable,
o Containment of potentially non-restorable source areas.

Shallow groundwater:

o Restoration of aqueous contaminant plumes.

The 1998 OU-1 ROD selected the following remedy:

Excavation and transportation of contaminated soil to a permitted landfill followed by
backfilling excavated areas with clean fill.

DNAPLsource removal from the shallowand intermediate aquifers via an
extraction system.

• Treatment of the shallow groundwater plume through a combination of recovery
wells/filtration system and phytoremediation.

Additional sampling of surface water and sediment, following mitigation of coal tar
discharge into the Cooper River, to fully delineate the extent of contamination and
potential threat to aquatic and terrestrial life.

The OU-1 ROD did not specify an anticipated timeframe for this remedy but did note that the full-
scale groundwater/DNAPL remedy would be an iterative process that must be conducted for a
sufficient period of time before its ability to meet applicable cleanup levels can be fully evaluated.

Cleanup goals for OU-1 shallow groundwater are included in Table 2.

-------
Table 2:1993 ROD Established Remediation Goals for OU-1

Shallow Groundwater

COC

1998 ROD Cleanup Goal
fme/L)

Arsenic

0.05

Benzene

0.005

Benzo(a)pyrene

0.00023

Beryllium

0.004

Carbazole

0.005b

Chromium

0.1

Chrysene

0.020c

Copper

1.3

Cyanide

0.2

2,4-Dimethyl phenol

0.7b

Ethylbenzene

0.7

Lead

0.015

Mercury

0.002

Naphthalene

1.5b

Nickel

0.1

Toluene

1.0

Notes:

Source: 1998 OU-1 ROD Section 7.1.2

a.	Represents PAHs as a group.

b.	Based on actual risk calculation rather than MCLs.

c.	The ROD cleanup goal for chrysene was 0.02 mg/L, but the June 2018 Shallow Groundwater Monitoring Report
notes that the chrysene cleanup goal was changed to 0.2 mg/L and that this was approved in a SCDHEC letter
dated May 23, 2002.

mg/L = milligrams per liter



8

-------
Preliminary Remedial Goals (PRGs) included in the 1998 OU-1 ROD for soil are included in
Table 3 below.

Table 3:1998 OU-1 ROD Soil PRGs

Soil COC

1998 ROD PRG
(mg/kg)'

Arsenic

7.6

Benzo(a)pyrene (EQ)b

1.7

Notes:

Source: 1998 OUI ROD Section 7.1.1

a. These values were based on data presented in the risk assessment. The PRGs are not the
concentrations above which all soils should be remediated. The PRGs are based upon the Upper
Confidence Limits (UCL) in the same manner as the risk assessment used UCL in calculating the soil
exposure point concentrations for determining overall site risk.

b. EQ = Toxicity Equivalents. The toxicity associated with benzo(a)pyrene is used as a point of
reference for other carcinogenic PAHs.

mg/kg = milligrams per kilogram

During remedy implementation, three additional source areas were found: a former wood treating
operation, depositional areas around the former steam plant, and the discharge outfall of the former
oil-water separator. See Figure E-2 in Appendix E for a historical site map. The EPA determined that
performance standards could be achieved by methods other than those prescribed in the original ROD
for all the Site's source areas. In 2005, the EPA modified the original OU-1 remedy in an ESD. The
modified remedy included excavation of DNAPL source areas and installation of a perimeter DNAPL
collection trench with over 50 recovery wells. The modified remedy also specified mixing chemical
oxidants into the soil used to backfill the excavated areas and spot injections of oxidation products to
address shallow groundwater contaminated by source material that was inaccessible for excavation.

Operable Unit 2

OU-2 addresses intermediate groundwater, DNAPL in the intermediate sand unit that affects
intermediate groundwater, sediment, and surface water. The 2002 OU-2 ROD determined that
surface water required no additional action to protect public health and the environment because
of previous response actions. The 2002 OU-2 ROD included the following RAOs:

Intermediate groundwater:

o Removal or treatment of DNAPL to the maximum extent practicable,
o Containment of potentially non-restorable source areas,
o Restoration of aqueous constituent plumes.

o Prevent exposure to groundwater having concentrations above acceptable
risk levels.

Sediment:

o Prevent exposure of benthic organisms to impacted sediment,
o Prevent the volume of PAH-contaminated sediment from increasing.

-------
o Reduce the volume of PAH-contaminated sediment.

o Prevent the erosion and provide for the long-term stability (reduce mobility) of
impacted sediments.

10

-------
The 2002 OU-2 ROD included the following remedial components:

DNAPL removal to the extent practicable using either stationary or portable pumping
equipment and transportation of recovered DNAPL off site for reuse or treatment
and disposal.

In-situ treatment of contaminated groundwater in the intermediate zone, using
increasing dissolved oxygen concentrations to stimulate microbial activity and
biodegradation, or the direct destruction of dissolved constituents via chemical oxidation.
Groundwater monitoring in the contaminated part of the intermediate zone and at
sentinel well locations.

Restrictions to future uses of intermediate groundwater on SCE&G property through
a deed notification.

Evaluation of containment measures if DNAPL removal and institutional measures do
not help prevent migration of dissolved phase constituents.

Monitoring of existing sand blankets at the perimeter of existing structures and along
the west bank of the Cooper River.

Maintenance of the existing sand blankets, if required, and augmentation of the sand
blankets depending on supplemental total organic carbon and PAH data collected
during the remedial design.

The 2002 OU-2 ROD estimated a five-year DNAPL recovery period and a 12-year intermediate
groundwater monitoring period. Cleanup goals for OU-2 intermediate groundwater are included
below in Table 4.

Table 4: 2002 OU-2 ROD Intermediate Groundwater COC Cleanup Goals

Intermediate Groundwater

Groundwater COC

2002 OU-2 ROD Cleanup Goal
(mg/L)

Benzene

0.005

Benzo(a)pyrene

0.0002

Carbazole

0.005a

2,4-Dimethylphenol

0.7a

Ethyl benzene

0.7

Naphthalene

1.5a

Toluene

1.0

Xylenes (total)

10.0

Notes:

Source: 2002 OU-2 ROD Table 8-1

a. Indicates cleanup goals derived from risk-based calculations, rather than drinking water standards
(MCLs).

mg/L = milligrams per liter

-------
The 2002 OU-2 ROD stated that the remedial goal for contaminated sediments was to address PAH-
contaminated sediments with ESGTU HQs that were greater than 1.

Status of Implementation

Operable Unit 1
Soil

SCE&G completed the soil and source material excavation in eight phases from August 1998 through
November 2004, with soil management and disposal activities extending to the end of 2005. This
included removal of about 63,400 tons of contaminated soil, sediment, coal tar, and debris. Soil was
removed from the following areas to be protective of future commercial and construction workers:
substation, parking garage, NPS and Luden's Marine properties. Contaminated material was sent off
site for recycling or disposal. Excavated areas were backfilled.

As noted in the 2005 ESD, additional source material and soil removal activities were completed during
the OU-1 remedy implementation because additional source areas were discovered; and it was
determined that the performance standards could be achieved using alternate methods described
below. Concurrent with the sitewide redevelopment, a significant volume of DNAPL was removed
during the soil excavation described above (the original remedy prescribed DNAPL recovery via an
extraction system). There were some areas inaccessible for excavation, including the former gas
holder source area, which is located within the electrical substation. The substation and other
existing site features (i.e., underground utilities and structures) created obstacles to removing
DNAPL. Additional steps were taken to address DNAPL in inaccessible areas, including installation
of a perimeter collection trench with over 50 DNAPL recovery wells and mixing chemical oxidants
into the soil used to backfill the excavated areas and spot injections of oxidation products. See
below for more information on the DNAPL recovery. Lastly, due to the Site's proximity to the
Cooper River and the shallow water table, groundwater collection, storage and disposal was
necessary during soil excavation. During excavation activities, over 3,000,000 gallons of water
were removed and transferred to approved treatment facilities. These source material removal
activities contributed significantly toward achieving other remedial objectives.

DNAPL

The following DNAPL source areas were remediated by excavation: depositional areas around the
former steam plant, the former wood treating operation, the former rail spur, and the former oil
tank. The discharge outfall of the former oil-water separator received oxidant injections.

As documented by the 2005 ESD, a collection trench was installed with over 50 recovery wells
around the former rail spur and former oil tank source areas to increase the overall effectiveness
of the remedy by recovering DNAPL via the trench. See Appendix L, Figure L-l for the location of
the trench segments. DNAPL recovery activities also include automated recovery from DRW-06 in
the former gas holder source area and recovery from groundwater monitoring wells and other

-------
DRW wells where DNAPL typically accumulates. DNAPL removal began in October 1998 and is
ongoing. See the Data Review section of this FYR for more information.

Shallow Groundwater

Fortreatment of the groundwater plume, a combined approach was used that included:

• Installation and operation of DNAPL recovery wells.

• Removal and treatment at approved treatment facilities of over 3,000,000 gallons of water
resulting from excavation and construction activities.

• Amending backfill with commercially available oxidants.

• Point source injection of commercially available oxidants.

• Phytoremediation.

• Routine groundwater monitoring.

As documented in the 2005 ESD, oxidation products were introduced into the subsurface soil and
shallowgroundwater by amending excavation backfill material and conducting spot injections,
aiming to enhance bioremediation. Areas with enhanced backfill and shallow injections are shown
on Figure E-2 in Appendix E; the areas with enhanced backfill include the former wood treating
operation and former steam plant deposition source areas. In the early 2000s, injections occurred
in the following source areas: the former rail spur, former wood treating operation and the discharge
outfall of the former oil-water separator.

The United States Geological Survey (USGS) and SCE&G implemented phytoremediation (the
treatment of environmental contamination using plants) at the Site. Trees planted by SCE&G
uptake contaminated groundwater. The 2009 FYR estimated 105,000 gallons of contaminated
groundwater are taken up over an eight-month growing season. Benzene, toluene, naphthalene, and
other coal tar-related PAHs have been detected in tree tissue samples.

DNAPL recovery and groundwater monitoring are ongoing; see the Data Review section of this FYR
for more information.

Additional Sampling

The OU-1 remedy required that after coal tar discharge to the Cooper River is stopped, surface
water and sediment be sampled to delineate the extent of contamination. Seep mitigation
activities along Charlotte Street concluded in April 1999 and included excavation of 1,542 tons of
soil/sediment and debris and placement of a sand blanket over the excavated area.

Operable Unit 2

Intermediate Groundwater

Two DNAPL recovery wells (DRW-52C and DRW-53C) were installed on site to provide additional
locations in the intermediate unit; DNAPL removal from various intermediate wells is ongoing. In-

-------
situ groundwater treatment was conducted via the addition of chemical oxidants to treat
dissolved phase contaminants either biologically or through chemical destruction. The two
chemical oxidants (PermeOx® Plus or EHC-O™, and Fenton's reagent) were selected during the
design phase based on accessibility, extent, estimated constituent mass and regulatory requests.
Injections occurred from May 2005 to September 2006. Injection areas are depicted on Figures K-6
and K-7 in Appendix K. Post- remedial groundwater sampling continues to monitor intermediate
groundwater; see the Data Review section of this FYR for an assessment of the effectiveness of
these injections.

Sediment

Sediment was contaminated from the former Charlotte Street seep area and the former Calhoun
Street drain outfall. Before area redevelopment, a protective sand layer at least 2 feet thick was
installed. The OU-2 ROD sediment remedy called for monitoring, maintenance, and augmentation
(if needed) of existing sand blankets: Regulatory agencies later approved use of more stable and
permanent capping materials than the sand in place (i.e., concrete mats and stone riprap). The
additional sediment remediation work was divided into three areas (Areas 1, 2 and 3) along the
western bank of the Cooper River, as shown in Figure 1, page 13. Area 1 is at the end of Charlotte
Street Park underneath an observation platform. Area 2 is between the South Carolina Aquarium
and the NPS Tour Boat Facility. Area 3 is south of the NPS Tour Boat Facility. Generally,
contaminated sediment in these areas were capped near the shoreline where the existing sand
blanket may not have been thick enough to prevent exposure of benthic organisms to
contaminated sediment. The 2013 sediment remedial action report stated that because of the
stability and permanence of the capping materials installed and with completion of development
activities along the adjacent riverside property, no further monitoring or inspection of the capped
areas is required. The 2013 sediment remedial action report also noted that if future
development, construction, or other activities warrant disturbing or modifying the capping
materials, SCE&G and the agencies will be notified by the landowners and appropriate measures
will be taken to ensure that the sediment remediation measures remain intact.

Several supplemental sediment-related activities were also conducted during the remedial action;
while not specified in the ROD, they were completed as part of the sediment capping activities
described in the work plan. These activities included extending an existing oyster research study
area near the aquarium and regrading a small sand mound west of the oyster study area (to
mitigate a "scouring effect" the sand mound had on the oyster study area). This included
placement of bagged oyster shells north and south of the existing research area.

Construction for the caps over Areas 2 and 3 occurred in July and August 2006. For Area 1, SCE&G
and the City worked together on capping so it could be conducted in conjunction with the planned
construction of a city park at the end of Charlotte Street, as Charleston had plans to develop an
observation platform extending out over the river and covering most of Area 1. The city park
construction was delayed for several years due to technical and budgetary constraints, so the Area
1 remedial activities were completed in two phases. The first phase (sand blanket installation) was
conducted in March 2010 and the second phase (geotextile and riprap installation) was completed

-------
in December 2012. The City's construction of the observation platform was completed in
June 2013.

Institutional Controls HC)

The OU-2 ROD called for institutional controls restricting future uses of intermediate groundwater
on the SCE&G property (now DESC). Institutional controls were implemented for the SCE&G
property in September 2018 via a Declaration of Covenants and Restrictions. This institutional
control prohibits consumptive groundwater use; prohibits use of the property that interferes with
remediation; precludes residential, agricultural, day care, school, or elder care facilities, or
recreational uses; prohibits non-remedial well drilling; and precludes soil excavation without
EPA approval.

Decision documents do not require institutional controls for soil, but they are in place on the DESC
property as noted above. No institutional controls are in place for soil on other site properties, but
they do not appear to be needed as the cleanup of those areas has been completed and the soil
cleanup goals (listed in Table 3) are protective of a residential exposure scenario. See Appendices H
and I for more detail. The former DNAPL source area located at the discharge outfall of the former
oil-water separator is outside of the institutional control area on the substation property. However,
that source was remediated with oxidant injections; therefore, land use restrictions for the area
are not required.5

While institutional controls for groundwater were called for and have been implemented on the
substation property, contaminated groundwater is present outside of this property. Part of the
Charleston City Code; Chapter 7, Article IV, Division 2, Section 7-91(Ord. No. 2010-110, § 1, 7-20-
10), acts as an institutional control because it includes a requirement that dwelling structures
must have fresh water from a SCDHEC approved well or from a public water system supplied to
the individual building through an onsite water meter.6 This city ordinance provides protection
against use of contaminated groundwater. In addition, groundwater quality in the site vicinity is
brackish and unsuitable for human consumption.

Decision documents also do not require institutional controls for sediment, though contamination
beneath the capped areas could potentially pose risks to ecological receptors. Implementation of
conventional institutional controls on riparian properties presents a wide range of challenges and is
often deemed infeasible. To ensure the long-term integrity of the caps, DESC (or its subcontractor)
visually inspects the sediment caps during routine Operation and Maintenance (O&M) activities.
As the sediment caps are located within a public waterway, no work of any kind can be performed
in those areas without first obtaining prior permission and required permits from several

5 While not required by the remedy, prior to any digging in the vicinity of the discharge outfall of the former oil-water
separator, the property owner must notify the South Carolina 811 utility locating service to ensure that any excavation does
not disrupt underground utilities and to ensure that the work is performed in accordance with local regulations.

6 Accessed 1/2/2024 at https://librarv.municode.com/sc/charleston/codes/code of ordinances?nodeId=COCHSOCA

-------
regulatory agencies. That requirement acts as an institutional control that prevents activities that
could potentially impact the integrity of the sediment caps.

For the ICs to be enforceable, the decision document(s) should be modified to include land use
restrictions for all media of concern. For this Site, provisions for land use restrictions should be
added to the decision document(s) for soils and the sediments. Appendix O includes a copy of the
deed restrictions for parcels 4591304002, Tract C-l (a portion of parcel 4580102063), Tracts A2-1
(a portion of parcel 4580102028), and A2-2 (a portion of parcel 4580102064). Figure 1 shows the
extent of ICs at the Site.

16

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IC Summary Table

Table 5: Summary of Planned and/or Implemented Institutional Controls

Media, Engineered
Controls and Areas
that Do not Support

UU/UE Based on
Current Conditions

ICs
Needed

ICs Called
for in the
Decision
Documents

Impacted
Parcells)3

IC Objective

Instrument in Place

Soil

Yes

No

4591304002
(DESC)

Prevent land use that
interferes with
remediation and
prevent exposure to

remaining
contamination/DNAPL

2018 Declaration of
Covenants and Restrictions

Groundwater

Yes

Yes

4591304002
(DESC)

Restrict future uses of

intermediate
groundwater on the
SCE&G property

2018 Declaration of
Covenants and Restrictions

Groundwater

Yes

Yes

4590000006
4590000167
4590000166
4590000157
4591304001
4580102028
4580102062
4580102027

Restrict city-wide use
of groundwater

Ord. No. 2010-110, § 1,
7-20-10







4580102067
4580102064

Restricts use of
groundwater on
property

VCC 08-5754-NRP RB
Charleston LLC Declaration
of Covenants and
Restriction

Sediment

Yes

No

See Figure 1, Page
15

Ensure the long-term
integrity of the caps in

order to prevent
ecological exposure to
contaminated sediment

None

17

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'• [. r"-»S U ; S.;dM $Z ||

I ' -.jJ. 7

®V

Jf%

P, ,

^Ml§>

&es»»Kx -j
•*- «*«-««»

Feet

Sources: Charleston County GIS Viewer
(https://gisccweb.charIestoncounty.org/public_search/);
Declaration of Covenants and Restrictions Calhoun Park
ArealTract C Affordable Housing, 0.42 acres Charleston
County, SC; Statements of Maintenance of the Declaration
of Covenants and Restrictions (one for Tract A2-1 and one
for Tract A2-2, each located at approximately 7 Calhoun
Street in Charleston). Annual Statement; Maintenance of
the Declaration of Covenants and Restrictions Portion of the
Calhoun Park Area Site in Charleston County, SC, New
Tract C-l a Portion of TMS No.458-01-02-063; 2013 OU-2
Sediment Remedial Action Report

Legend

Approximate Site
Boundary

Parcel under 2018
Declaration of
Covenants &
Restrictions

Parcels IJntler
Declaration of
Covenants and
Restrictions (Tract [
A2-1 & A2-2)

Parcels Under Declaration of
Covenants and Restrictions
Calhoun Park Area/Tract C
Affordable Housing

Declaration of Covenants
and Restrictions Portion of
the Calhoun Park Area Site,
New Tract C-l a Portion of
TMS No.458-01-02-063

Approximate Sediment Caps

Approximate Oyster Research
Bed Area

i. ? t

TPdhec

Healthy People. Hcaltr.y Co(T\rnuiuu«j£.

Calhoun Park Area Superfund Site

Charleston, Charleston County, South Carolina

Figure 1: Institutional Controls Map (Disclaimer - This map and any boundary lines within the map are
approximate and subject to change. The map is not a survey. The map is for informational purposes only
regarding the EPA's response actions at the Site.)

-------
Systems Operations/Operation and Maintenance fO&M)

DNAPL recovery and groundwater monitoring are ongoing; these are explained in further detail in the
Data Review section of this FYR. Intermediate groundwater monitoring is performed in accordance
with 2007 Revised Technical Memorandum #003 and subsequent modifications. Shallow groundwater
monitoring and subsequent modifications are performed in accordance with the 2007 Technical
Memorandum #001. DESC submits shallow and intermediate groundwater monitoring reports
following each event to the EPA and SCDHEC.

In 2010, the site O&M personnel staffing was changed to a 2-week on and 1-week off schedule, which
has been effective in maximizing available DNAPL removal (by allowing for DNAPL recharge) while
reducing labor and overall site costs. Recovered DNAPL is contained in 55-gallon drums and
temporarily stored onsite in a secured, restricted access and monitored electrical substation facility.
Currently, the DNAPL drums transported to an approved facility for recycling via fuel blending at a
cement kiln. From August 2019 to June 2021, 98 drums were transported to Tradebe Environmental
Services recycling facility. From March 2022 to January 2023, 93 drums were transported to Giant
Resource Recovery recycling facility. Wastewater generated onsite from O&M activities is stored in an
on-site storage tank for future disposal. DESC submits DNAPL removal reports semiannually to the EPA
and SCDHEC. Maintenance is conducted as needed.

O&M is not required for soil cleanup areas, phytoremediation trees or sediment caps. The 2013
sediment remedial action report stated that because of the stability and permanence of the capping
materials installed and with the completion of development activities along the adjacent riverside
property; no further monitoring or inspection of the capped areas is required.

III. PROGRESS SINCE THE LAST REVIEW

This section includes the protectiveness determination and statement from the previous FYR Report
(Table 6) as well as the recommendations from the previous FYR Report and the status of those
recommendations (Table 7).

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Table 6: Protectiveness Determination/Statements from 2019 FYR

ou#

Protectiveness
Determination

Protectiveness Statement

OU-1

Short-term
Protective

The remedy at OU-1 currently protects human health and the environment
because contaminated soil was excavated and disposed of off-site, DNAPL was
removed during excavation and continues to be removed via ongoing DNAPL
recovery, shallow groundwater monitoring and phytoremediation are ongoing,
bioremediation products were put in backfill and injected into the subsurface,
and institutional controls are in place to prevent exposure to contaminated
groundwater. However, in order for the remedy to be protective over the long-
term, the following action needs to be taken:

•	Evaluate whether naphthalene and 2,4-dimethylphenol
groundwater cleanup goals warrant updating to reflect
appropriate risk levels.

•	Evaluate whether the new chrysene groundwater cleanup goal should
be updated in a decision document.

•	Officially document the need for institutional controls forthe
substation property soil, for site-related groundwater contamination
outside of the substation property and forthe sediment caps.

•	Ensure the detection limit is low enough to assess
achievement of the benzo(a)pyrene groundwater
cleanup goal.

OU-2

Short-term
Protective

The remedy at OU-2 currently protects human health and the environment
because contaminated sediment was capped, intermediate groundwater
monitoring is ongoing, bioremediation products were put in backfill and
injected into the subsurface, and institutional controls are in place to prevent
exposure to contaminated groundwater, ensure the long-term integrity of the
sediment caps and to prohibit activities that could potentially disturb the caps.
However, in order for the remedy to be protective over the long-term, the
following action needs to be taken:

•	Evaluate whether naphthalene and 2,4-dimethylphenol
groundwater cleanup goals warrant updating to reflect
appropriate risk levels.

•	Officially document the need for institutional controls forthe substation
property soil, for site-related groundwater contamination outside of the
substation property and for the sediment caps. Ensure the detection limit is
low enough to assess achievement of the benzo(a)pyrene groundwater
cleanup goal.

Sitewide

Short-term
Protective

Because the remedies for OU-1 and OU-2 are protective in the short term, the
sitewide remedy is protective in the short term. For the sitewide remedy to be
protective over the long term, the issues identified for OU-1 and OU-2 need to
be addressed.

20

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Table 7: Status of Recommendations from 2019 FYR

ou#

Issue

Recommendations

Current
Status

Current
Implementation
Status Description

Completion

Date (if
applicable)

OU-1
OU-2

The groundwater cleanup
goals for naphthalene and
2,4-dimethylphenol do not
correspond to risks within
the EPA's acceptable
risk range.

Evaluate whether
naphthalene and 2,4-
dimethylphenol
groundwater cleanup
goals warrant updating
to reflect appropriate
risk levels.

Considered

But Not
Implemented

The current cleanup goal
for 2,4-dimethylphenol is
protective, as the majority
of monitoring well locations

sampled below the RSL
value as well as the cleanup
level. The site is considered
short-term protective with
groundwater ICs in place.

1/25/2024

Ongoing

The current cleanup goal

for naphthalene was
compared to current the
RSL. The RSL was then
compared to the Site's
monitoring results. Based
on monitoring results, an
updated cleanup goal for
naphthalene should
be considered.

N/A

OU-1

The chrysene cleanup goal
was changed from the 1998
OU-1 ROD'S value of 20 |ig/L
to 200 |ig/L; this was
approved in a 2002 SCDHEC
letter. This cleanup goal
change does not appear to
have been documented in a
formal EPA document.

Evaluate whether the
new chrysene
groundwater cleanup
goal should be updated
in a decision document.

Ongoing

Ongoing

N/A

OU-1
OU-2

There is no remedial
requirement for institutional
controls for the substation
property soil, for site-related
groundwater contamination
outside of the substation
property or for the
sediment caps.

Officially document the
need for institutional
controls for the
substation property soil,
for site-related
groundwater
contamination outside
of the substation
property and for the
sediment caps.

Considered

But Not
Implemented

Considered But Not
Implemented

N/A

OU-1
OU-2

The detection limit used for
benzo(a)pyrene is above its
established groundwater
cleanup goal.

Ensure the detection
limit is low enough to
assess achievement of
the benzo(a)pyrene
groundwater cleanup
goal.

Completed

Method SW846 8270D with
a reporting limit of
0.20 |ig/L and a method
detection limit of
0.085 |ig/L for
benzo(a)pyrene was
implemented for

groundwater
analytical results.

4/1/2020

21

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Other Findings

Six additional recommendations were identified during the 2019 FYR. These recommendations did not
affect current and/or future protectiveness.

Update the site repository with recent documents.

• In groundwater monitoring reports, clearly distinguish between groundwater contaminant
concentrations that are below laboratory reporting limits and those that were below
laboratory minimum detection limits or "non-detect".

Continue to closely monitor COC concentrations and DNAPL at sentinel well LM-10AR. If
COC concentrations continue to increase, or if DNAPL increases at well LM-10AR,
additional evaluation of that area may be warranted.

Consider groundwater monitoring program optimization suggestions from SCE&G.
Consider mapping plumes in groundwater monitoring reports.

Consider formally documenting the decision to remove nickel, beryllium, lead,
mercury, chromium, copper, and arsenic from the list of shallow
groundwater COCs.

The following provides updates for each Finding:

Update the site repository with recent documents. The EPA will transfer the local information
repository to an online format, allowing the EPA to make information available to the public more
efficiently and conveniently. The local library that serves as the current repository can provide internet
access to the community via the publicly available computers.

Clearly distinguish between groundwater contaminant concentrations that are below laboratory
reporting limits (RLs) and those that were below laboratory minimum detection limits (MDLs) or "non-
detect". Groundwater reports have been changed to clearly distinguish between RLs and MDLs.

Closely monitor COC concentrations and DNAPL at sentinel well LM-10AR. If COC concentrations
continue to increase, or if DNAPL increases at well LM-10AR. additional evaluation of that area may be
warranted. Sentinel well LM-10AR has continued to be monitored. Benzo(a)pyrene decreased from
40.0 pig/L in 2020 to 8.0 pig/L in 2022. The relatively low levels of PAHs detected in LM-10AR samples
are attributed to the continued presence of residual DNAPL in the vicinity of the wells.

Consider groundwater monitoring program optimization suggestions from SCE&G. Groundwater
monitoring program optimization suggestions were considered and implemented as needed.

Consider mapping plumes in groundwater monitoring reports. Groundwater plumes are now included
in groundwater monitoring report.

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Consider formally documenting the decision to remove nickel, beryllium, lead, mercury, chromium,
copper, and arsenic from the list of shallow groundwater COCs. The formal documentation recording
the decision to remove nickel, beryllium, lead, mercury, chromium, copper, and arsenic from the list of
shallow groundwater COCs is under review by the EPA and SCDHEC.

IV. FIVE-YEAR REVIEW PROCESS

Community Notification. Involvement & Site Interviews

On October 19, 2023, the EPA issued a press release, which announced that comprehensive reviews
will be conducted of completed cleanup work at NPL Superfund sites in the Southeast, including the
Calhoun Park Area Site. Appendix F contains a copy of the EPA News Release. A copy of the FYR report
will be made available on the EPA website: https://www.epa.gov/superfund/superfund-five-year-
reviews.

During the FYR process, interviews were conducted to document any perceived problems or successes
with the remedy that has been implemented to date. The interviews are summarized below and
included in full in Appendix F.

Tom Effinger (DESC) stated that DESC has and continues to remediate various site media while
maintaining the safe operation of a critically important electrical substation. He noted that integrating
site remediation with redevelopment allowed remediation during other construction activities, which
supported property improvements for the surrounding community. Mr. Effinger said the completed
and ongoing remedial activities continue to be protective of the environment, practical (given site
limitations), and cost-effective. He said that DNAPL continues to be removed (over 52,000 gallons and
continuing) and elevated groundwater constituents continue to attenuate as a result. He also noted
that optimization for the shallow and intermediate groundwater monitoring and reporting and routine
quarterly reports is being discussed with state and federal agencies.

Rusty Contrael (Ace, Inc.), stated that cleanup has been completed to the maximum extent practicable
given the logistical and geological challenges encountered at this Site. Mr. Contrael stated the remedy
is functioning as intended, DNAPL and contaminated groundwater are not migrating, and O&M
activities continue to be efficient and cost-effective. The potential for Site reuse has been maximized.
The site was awarded the "Excellence in Site Reuse" from the EPA in 2012.

The shallow groundwater monitoring program was reduced from a 9-month to an annual sampling
interval. The change also included sampling of the sentinel wells on a biennial basis (i.e. every other
year). The changes have resulted in cost savings and improved efficiency of the overall remedy.

Similar optimizations/reductions have been proposed and implemented for the intermediate
groundwater monitoring program.

Mr. Contrael recommends that wells at the Site that are no longer essential to the monitoring
programs be properly abandoned. Additionally, the current groundwater monitoring programs should

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be evaluated and recommendations to reduce sampling frequencies, locations and constituents may
be warranted.

Sara Callahan, the project manager with SCDHEC stated that the Site remediation is progressing at an
acceptable rate. The hydrology/geology of the Site is well understood, and the groundwater
contaminant plume is well defined as is the DNAPL. Current land uses at the site include commercial
and residential buildings, continued utility services, public and educational services, recreational and
cultural attractions, and ecological projects.

Data Review

The data collected during this FYR period include DNAPL recovery volumes and shallow and
intermediate groundwater monitoring.

DNAPL Recovery

Manual DNAPL extraction continues to remove DNAPL from the subsurface. A total of 52,113 gallons of
DNAPL have been removed from October 1998 to May 2023. Removal occurs via DNAPL recovery wells
located in excavated collection trenches, automated recovery from DRW-06 located in the former
gas holder, and recovery from groundwater monitoring wells and other DRW wells where DNAPL
typically accumulates.7

The DNAPL trench, recovery wells, recovery segments, and recovery volumes by segment are included
in Appendix L, Figure L-l. Over the last five years, the highest volumes of DNAPL recovered were from
segment 7. Segment 7 includes DRW-06, which is in the former gas holder, a main DNAPL source area
that cannot be excavated. Starting in 2014, the recovered DNAPL volume increased an order of
magnitude in segment 7 (Appendix L, Figure L-l). From 2014 through 2022, the recovered DNAPL
volume per year in segment 7 has shown an increasing trend from 1,634.0 gallons in 2014 to
2,526.3 gallons in 2022. For 2023, the recovered DNAPL volume per year in segment 7 dropped to
1,473.6 gallons, the lowest recovered DNAPL volume per year in 9 years.

Except for segment 7, the recovered DNAPL volumes indicate a downward trend when comparing this
FYR period's volumes to historical data. The lowest recovered DNAPL volume per year in all segments
was in 2023. Aside from segment 7, the recovered DNAPL volume per year was at least half again lower
in 2023 than in 2022 (Appendix L, Tables L-l, L-4, and L-18, Figures L-l, L-2, L-5, L-6, L-8, and L-9).

Shallow Groundwater

Shallow groundwater is monitored to assess the restoration of the aquifer and evaluate the
potential for contaminant migration. Originally, the shallow groundwater sampling program
involved sampling a total of 15 monitoring wells with six designated as sentinel locations and nine
as aqueous plume monitoring wells. In December 2007, two wells (MW-12A and DRW-03) were
eliminated with the EPA and SCDHEC concurrence. From December 2007 to June 2018, thirteen

7 The bottom of the former gasholder is on clay that is believed to provide a low hydraulic conductivity layer.

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monitoring wells (five sentinel and eight aqueous plume) were included in the shallow
groundwater sampling program. The June 2018 Shallow Groundwater Monitoring Results Report
(Apex, October 2018) recommended to reduce the sampling frequency of the aqueous plume
wells to annual and the sentinel wells to biennial (i.e., every other year), re-designate well MW-14
(previously an aqueous plume well) as a sentinel well, and remove seven PAH parameters from
the analytical program. Regulatory approval of the proposed changes was provided in a letter
dated January 9, 2019. Beginning with the April 2019 monitoring event, six sentinel wells and
seven aqueous plume wells were sampled as part of the shallow groundwater sampling program
(Appendix J, Figure J-l). The April 2019 Shallow Groundwater Monitoring Results Report (Apex,
September 2019) recommended reducing the number of groundwater level measurements from
75 to 39 wells. SCDHEC approval to eliminate 26 of the proposed 36 wells was provided in a letter
dated November 4, 2019.

Beginning with the April 2019 event, sampling is performed annually for the aqueous plume wells.
The sentinel wells are sampled biennially with the first biennial event in April 2022. The
monitoring events include groundwater level and DNAPL occurrence measurements.

Groundwater sampling is performed using modified low flow techniques. The parameters
analyzed include benzene, toluene, ethylbenzene, total xylenes (BTEX), semi-volatile organic
compounds (SVOCs) comprised of nine polynuclear aromatic hydrocarbons (PAHs), carbazole,
2,4-dimethylphenol, and cyanide.

Sentinel Wells

BTEX was not detected in the six sentinel wells (DW-04, LM-03A, LM-10AR, MW-07AR, MW-14
and MW-33). In the 2020 shallow groundwater sampling event, PAHs were detected in two
sentinel wells, LM-10AR and MW-14. LM-10AR had five PAHs detected at concentrations ranging
from 12.5 ng/L (anthracene) to 75.1 ng/L (fluoranthene). Only benzo(a)pyrene detected at
40.0 [ig/L exceeded its cleanup goal. Acenaphthene (0.26 [ig/L) and fluorene (10.5 [ig/L) were
detected in MW-14. Neither detection exceeded their cleanup goals. In the 2022 shallow
groundwater sampling event, PAHs were detected in a single sentinel well, LM-10AR. The only
PAH detected above its cleanup goal was benzo(a)pyrene at 8.0 ng/L. The relatively low levels of
PAHs that were detected in LM-10AR and MW-14 samples are attributed to the continued
presence of residual DNAPL in the vicinity of the wells.

Cyanide was not detected in any sentinel well during the 2020 shallow groundwater sampling
event. Cyanide was detected in four of the six sentinel well samples during the 2022 shallow
groundwater sampling event at concentrations ranging from 0.005 to 0.0095 mg/L. All detections
were at or within two times the RL, and cyanide was also detected at a low level in the equipment
blank. These results are well below the cleanup goal and were not considered significant.

Aqueous Plume Wells

The aqueous plume wells monitor contamination trends in the shallow aquifer. These wells are
located near the former gas holder on the substation property (MZ-02AR, MM-02A and MM-03A),
near the former steam power plant/Luden's Marine (LM-02A and LM-01AR) and near the former
oil/water separator discharge (MRW-01, MRW-02and MW-14). Since December 2010, benzene has

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not been detected in the aqueous plume wells LM-02A and MRW-02. Benzene cleanup goal
exceedances in the other aqueous plume wells are summarized in Table J-3 in Appendix J. The
highest benzene exceedance over the past five years was in well MM-03A with a concentration of
1080 ng/L. Concentrations fluctuated by up to a single order of magnitude during thisFYR period,
which is consistent with historical data (Appendix J, Figure J-2).

Since September 2014, naphthalene was not detected in samples from four (LM-02A, MM-02A,
MRW-02, and MZ-02AR) of the eight aqueous plume wells. Naphthalene was detected but did not
exceed the cleanup goal in wells LM-01AR and MRW-01. The only naphthalene exceedance above
the cleanup goal of 1,500 ng/L in the last five years was observed in well MM-03A with a
concentration of 6,130 ng/L in April 2019.

Over the past five years the highest cumulative BTEX and PAHs concentrations have generally
been detected in wells MRW-01, MM-03A and LM-0IAR.

Cyanide has been detected above the 0.2 milligram per liter (mg/L) cleanup goal in every
monitoring event in this FYR period. These exceedances have occurred in wells LM-0IAR
and MM-03A.

Intermediate Groundwater

The current intermediate groundwater monitoring program was developed to provide data to
demonstrate the long-term effectiveness of the in-situ chemical oxidation treatment areas and
plume stability via natural attenuation processes at other areas of the Site. The OU-2 ROD
estimated that based on in-situ treatment benefits, the total duration of intermediate
groundwater monitoring would be 12 years, which has now been exceeded (injections occurred
in 2005 and 2006, which is 19 to 20 years ago).

Groundwater samples were collected from 9 to 12 (depending on the event) intermediate
monitoring wells during this FYR period (Appendix K, Figure K-l). The intermediate sand unit is
split into upper, middle, and lower sections. Groundwater is sampled annually and analyzed for
BTEX and SVOCs. The SVOCs consists of carbazole and two PAHs, specifically naphthalene and
benzo(a)pyrene. See Figures K-2 through K-4in Appendix Kfor historical benzene and naphthalene
results in the upper, middle, and lower intermediatesand units relative to the in-situ chemical
oxidation treatment areas. Intermediate groundwater monitoring data from this FYR period are
included in Table K-3 in Appendix K.

Upper Intermediate Sand Unit

A total of four upper intermediate sand unit wells were sampled during this FYR period. For
discussion purposes, the upper intermediate sand unit wells are grouped into two separate
categories and include:

• Fenton's Reagent Treatment Area; and

• Natural Attenuation Areas.

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Upper intermediate well BM-03D is located in the area previously treated with Fenton's reagent.
Wells PAMW-02, BM-04D, and MM-13C are located in the natural attenuation area of dissolved
phase constituents is being monitored. The well locations and historical benzene and naphthalene
results are shown on Figures K-l, K-2, K-3, K-4, and Table K-3 in Appendix K.

Fenton's Reagent Treatment Area (BM-03D)

The initial Fenton's reagent treatment occurred in 2005 with a follow-up polish treatment in 2006 at
locations west of Washington Street on Rabin's and East Bay (BM-03D) properties.

BM-03D groundwater analytical results over the past five years are shown in Appendix K, Figure K-2
and Table K-3 and indicate the following:

• Benzo(a)pyrene was not detected above the RL;

• Benzene, ethylbenzene and naphthalene were detected within their historical ranges, with
each above their respective cleanup goals;

• Carbazole highest detection of 7.7 pig/L occurred in 2020 and was detected slightly above the
cleanup goal (5 ng/L);

• Toluene (67.8 J pig/L in 2022) was detected below the cleanup goal, with the past four
monitoring results being the four lowest concentrations; and

• Total xylenes, ranging from 434 pig/L in 2019 to 624 J pig/L 2022, was detected below the
cleanup goal. The trend over the past 5 years has been slowly increasing, however the
concentrations show a decreasing trend over the life of the project.

Natural Attenuation Areas (PAMW-02. BM-04D. and MM-13C)

PAMW-02 is located on the SCSPA property as shown in Appendix K, Figure K-2. This area was
previously treated by injecting PermeOx® Plus and EHC-O™ in 2005. Since March 2012, only benzene
has been detected and the other constituents analyzed have not been detected above the RL. Over this
time, benzene has not been detected above the RL in six of fourteen events. Attenuation is
demonstrated via benzene since concentrations have decreased from a maximum of 18,000 ng/L
(September 2006) to low (less than 65 ng/L) to not detected above the RL from December 2012
through June 2017. Following detection at comparatively higher concentrations in samples collected in
March through December 2019, benzene has been at low to not detected above the RL for the past
three monitoring events. Table K-3 in Appendix K provides the data.

BM-04D is located on the north side of Charlotte Street and north of the former gasholder (Appendix K;
Figures K-l and K-2). The BM- 04D December 2022 analytical results indicate:

• The benzene concentration has increased over the past five years from 9,450 |ig/L in 2019 to
19,500 ng/L in 2022. Concentrations continue to be above the cleanup goal of 5.0 ng/L and is
the highest since the September 2016 event;

• The ethylbenzene concentration has increased over the past five years from 747 |ig/L in 2019 to
1,070 |ig/L in 2022. Concentrations continue to be above the cleanup goal of 700 |ig/L. Since

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December 2018, detections of ethylbenzene (excluding an anomalous result in December 2015)
are five of the six lowest results reported during the monitoring program;

• Naphthalene was detected at the historically highest concentration (11,800 ng/L) in 2022 and
continues to persist above the cleanup goal of 1,500 ng/L;

• Similar to results since December 2019 when use of a lower RL was initiated, benzo(a)pyrene
continues to be detected at a low level above the cleanup goal of 0.2 |ig/L;

• Over the past five years, total xylenes were detected at the lower end of the historical range.
Although consistently detected, the results have not exceeded the cleanup goal of 10,000 |ig/L;

• Consistent with results over the past five years, toluene was detected well below the cleanup
goal of 1,000 ng/L; and

• Carbazole has been detected from 4.9 |ig/L in 2019 to 5.3 |ig/L in 2022. The cleanup goal for
carbazole is 5 Hg/L.

MM-13C is located in the southwestern corner of the substation (Appendix K, Figure K-2).

Groundwater analytical data for benzene ranged from a low of 17,300 |ig/L in 2022 to a high of
28,400 ng/L in 2019. This exceeded the cleanup goal of 5.0 ng/L but was within the respective
historical ranges. Ethylbenzene ranged from a low of 1,770 |ig/L in 2019 to a high of 2,750 |ag/L in
2020. This exceeded the cleanup goal of 700 |ig/L but was within the respective historical ranges.
Naphthalene ranged from a low of 763 |ig/L in 2020 to a high of 3,200 |ig/L in 2022. Naphthalene
exceeded the cleanup goal of 1,500 |ig/L, except for the 2020 sampling event, but was within the
respective historical ranges. The remaining detected constituents (toluene and total xylenes) were
below cleanup goals over the past five years, consistent with historical results. Benzo(a)pyrene was not
detected above the RL (0.2 ng/L) over the past 5 years. Carbazole ranged from a low of 0.49 |ig/L in
2022 to a high of 7.3 |ig/L in 2020. Carbazole exceeded the cleanup goal of 5.0 |ig/L, except for the
2022 sampling event.

Middle Intermediate Sand Unit

Groundwater samples were collected from 3 to 6 (depending on the event) middle intermediate
monitoring wells during this FYR period. Table K-3 in Appendix K provides the analytical results
and Figure K-3 provides the monitoring well locations with a historical summary of benzene and
naphthalene concentrations. Appendix K provides the historical middle intermediate sand unit
groundwater analytical results. For evaluation purposes and similar to the upper intermediate
sand unit, the middle intermediate sand unit will be discussed in terms of the Fenton's reagent
treatment area (BM-10C), natural attenuation areas (MM-02D, PM-01C, and MM-12B), and the
sentinel areas (NM-06D and LM-08C). The sentinel wells are now sampled biennially and are
intended to detect potential dissolved phase plume migration, should it occur.

Fenton's Reagent Treatment Area (BM-10C)

As shown in Appendix K, Figure K-3 and Table K-3, groundwater analytical results from BM-10C
over the past five years indicate BTEX and naphthalene were detected. Benzene was detected
from a low of 2,300 [ig/L in 2022 to a high of 5,350 [ig/L in 2020. Benzene detections exceeded
the cleanup goal of 5.0 ng/L. The remaining detected constituents were below their respective

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cleanup goals. The detected constituent concentrations were within the historical ranges
(Appendix K, Table K-3). Toluene was not detected above the RL of 5.0 ng/L for the first time since
June 2017. Benzo(a)pyrene and carbazole were not detected above the RL, which is consistent
with historical results.

The groundwater data from BM-10C reflects groundwater quality variability in the middle
intermediate sand unit.

Natural Attenuation Areas (MM-02D. PM-01C. and MM-12B)

Results for the three natural attenuation area monitoring well samples (MM-02D, PM-01C, and
MM-12B) indicated that benzene concentrations exceeded the cleanup goal of 5 |ig/L over the past
five years. The naphthalene concentration in MM-02D exceeded the cleanup goal of 1,500 |ig/L in
each sampling event over the past five years, except in 2020 when naphthalene was detected at
1,150 |ig/L. The remaining constituents were not detected above the RL except for ethylbenzene in
the MM-02D and MM-12B samples, which was detected at relatively low concentrations.

The following observations are made with respect to the historical benzene and
naphthalene data (Figure 4):

• MM-02D: Benzene and naphthalene fell within their respective historical range.

• PM-01C: Benzene was at the low end of its historical range. Naphthalene was not detected
above the RL, consistent with data since June 2017.

• MM-12B: Benzene continued the trend of lower concentrations, with the last three results
being the three lowest concentrations since September 2013. Naphthalene was not
detected above the RL, consistent with results since the December 2015 event.

Sentinel Areas (LM-08C and NM-06D)

Consistent with historical results, constituents were not detected in groundwater samples from
sentinel wells LM-08C and NM-06D confirming that potential dissolved phase plume migration
into these areas is not occurring (Appendix K, Figure K-2, Table K-3).

Lower Intermediate Sand Unit

Groundwater analytical results for the 2 lower intermediate sand unit monitoring well samples
(MM-01D and MM-16D) are provided in Appendix K, Table K-3. Historical benzene and
naphthalene results are provided in Appendix K, Figure K-4.

MM-01D exhibited its sixth consecutive result (since March 2018) not detected above the RL for
benzene in December 2022 (Appendix K, Figure K-4). The other constituents analyzed in MM-01D
remained not detected above the RL.

Benzene (7.9 [Xg/L) and benzo(a)pyrene (0.85 ng/L) were detected in MM-16D above their cleanup
goals of 5.0 pig/L and 0.2 [J.g/L, respectively, in 2020. Over the past five years, 2020 was the only
sampling event with detections of constituents above cleanup goals. The results show a sustained

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downward trend in benzene concentrations from a maximum concentration of 430 pig/L
(October 2001 and April 2005). Naphthalene has not been detected above the RL since May 2014.

Site Inspection

The site inspection took place on February 14, 2024. Participants included EPA RPM Allan Hernandez,
Sara Callahan, Sara MacDonald, Billy Britton, and Timothy Kadar with SCDHEC, Tom Effinger and
Paul Biery with DESC, and Rusty Contrael with Ace, Inc. The purpose of the inspection was to assess the
protectiveness of the remedy. The participants met at the DESC electrical substation and began with an
overview of the Site's history and status followed by a short health and safety briefing. The group then
toured the Site, inspecting the active DNAPL pumps, recovery wells, DNAPL collection drums, and
monitoring wells, which all appeared to be in good condition. The phytoremediation trees line the
substation to the south and appeared healthy during the inspection. The substation is fenced, and
access is restricted. Site inspection participants then toured the rest of the Site, which included
monitoring wells and several areas that have been redeveloped (the South Carolina Aquarium and
parking garage. Liberty Square, the Fort Sumter NPS property, and several commercial buildings). The
participants also visited the three sediment caps. The Area 1 cap is covered by an observation platform
at the Charlotte Street Park. Participants were able to see the oyster habitat area near the Area 2 cap
and some of the concrete mats on the Area 3 cap. The site inspection checklist and photographs are
included in Appendices G and M, respectively.

The site inspection identified wells that are outside of the boundaries as defined by the 1998 and 2002
RODs and the previous FYRs. Wells exist north of Charlotte Street on the Ports Authority property and
a small DESC substation at the corner of Washington Street and Charlotte Street. There are also wells
on the west side of Washington Street in commercial/business parking lots.

The former Ansonborough Homes housing project has been razed, soil remediation/removal
completed, and redeveloped into commercial properties, parking area, soccer fields, and apartment
building. There are no wells associated with the Site remaining within the former Ansonborough
Homes housing projects.

The EPA will transfer the local information repository to an online format, allowing the EPA to make
information available to the public more efficiently and conveniently.8 The library can provide access
via the publicly available computers. The EPA will post this FYR online at
https://www.epa.gov/superfund/superfund-five-year-reviews.

8 On March 18, 2013, the EPA promulgated a final rule to amend 40 C.F.R § 300.805(c) of the NCP "Location of the
Administrative Record File" to acknowledge advancements in technologies used to manage and convey information to the
public. This enabled the EPA to make Administrative Records available to the public via the internet.

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V. TECHNICAL ASSESSMENT

QUESTION A: Is the remedy functioning as intended by the decision documents?

Question A Summary:

A review of documents, ARARs, risk assumptions and the site inspection indicate that the Site's remedy
is functioning as intended.

The remedy is functioning as intended by the decision documents. About 63,400 tons of contaminated
soil, sediment, coal tar and debris were excavated and disposed of offsite. A large amount of DNAPL
was removed during the soil remediation. DNAPL removal is ongoing via a recovery system.
Bioremediation was conducted by amending excavation backfill material and by conducting injections.
During the soil excavation, contaminated water was removed and treated. Phytoremediation was
implemented by USGS by planting trees near the substation and is ongoing as trees uptake
contaminated groundwater. Three sediment caps are in place to prevent ecological exposure to
contaminated sediments.

From the beginning of the DNAPL removal program through November 2012, the highest volume
removed from trench wells occurred at Segment 2, located in the south-central portion of the
substation. From December 2012 through November 2014, the highest DNAPL volume removed
alternated between Segment 2 (summer periods) and Segment 6 (winter periods). Since
November 2014, the highest volume removed has occurred at Segment 6. This data suggests DNAPL
volume in Segment 2 continues to diminish while at Segment 6 DNAPL volume has diminished at a
slower rate (see Appendix L).

Shallow sentinel well monitoring results indicate that the groundwater contamination does not appear
to be migrating beyond the sentinel wells. Monitoring continues to be effective in detecting subtle
changes in site conditions. Overall, average benzene and naphthalene concentrations in shallow
groundwater are negative and show a downward trend (see Appendix J).

Naphthalene, benzene, and other contaminant concentrations are above cleanup goals in several areas
of the Site in both the shallow and intermediate aquifers. Some concentrations are increasing or
fluctuating by about an order of magnitude. In addition, the OU-2 ROD estimated that intermediate
groundwater monitoring would be needed for 12 years based on the expected effects of in situ
treatment. Injections occurred in 2005 and 2006 (19 to 20 years ago), and some intermediate wells are
still not trending downward (i.e., groundwater monitoring is still needed at this time).

The remedy is taking longer than anticipated. DNAPL removal volumes appear to be increasing in
DRW-06 and are likely reflective of pump adjustments by operation personnel. There is also a lack of
clear decreasing trends in some shallow groundwater aqueous plume monitoring wells. Results of
injections are also mixed in the intermediate aquifer. The PRP is aware of these issues and is actively

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looking for ways to improve remedy performance. When determined to be appropriate, the PRP also
makes system adjustments to improve DNAPL recovery.

Institutional controls are in place for the DESC property, which includes groundwater and land use
restrictions. Part of the Charleston City Code (Ord. No. 2010-110, § 1, 7-20-10) acts as an institutional
control for groundwater outside of the substation property. Institutional controls are not needed for
soil at properties outside of the DESC substation property because soil cleanup has been completed
and the soil PRGs are protective of a residential exposure scenario (Appendix I). Contamination
remains in place under capped sediment areas, but decision documents do not require institutional
controls to ensure the long-term integrity of sediment caps. Implementation of conventional
institutional controls on riparian properties presents a wide range of challenges and is often deemed
infeasible. As the sediment caps are located within a public waterway, no work of any kind can be
performed in those areas without first obtaining prior permission and required permits from several
regulatory agencies. That requirement acts as an institutional control that prevents activities that could
potentially impact the integrity of the sediment caps. The OU-2 ROD called for institutional controls to
restrict future use of intermediate groundwater on the DESC property; however, decision documents
did not call for institutional controls for the substation property soil, for contaminated groundwater
outside of the substation property or for the sediment caps.

QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels and RAOs used at the time of
the remedy selection still valid?

Question B Summary:

Groundwater cleanup goals based on Applicable or Relevant and Appropriate Requirements (ARARs)
were reviewed as part of this FYR to determine if any ARAR values have changed since issuance of
decision documents. The full evaluation is included in Table H-l, H-2, H-3, and H-4 of Appendix H and
indicates that the only MCL that has changed is arsenic, which was removed from the COC list in 2002.
Therefore, all the Site's ARAR-based cleanup goals remain protective.

Groundwater cleanup goals that were health-based rather than ARAR-based were also reviewed as
part of this FYR. These groundwater cleanup goals were compared to current Regional Screening Levels
(RSLs) to see if they remain valid. RSLs incorporate current toxicity values and standard default
exposure factors. The full evaluation is included in Table 1-1 of Appendix I and indicates that the health-
based cleanup goals remain valid except for the noncancer risk from 2,4-dimethylphenol and the
noncancer and cancer risk from naphthalene. Tap water RSLs are conservative screening levels for
drinking water and the groundwater at the Site is not used for drinking; therefore, this does not affect
current protectiveness. However, the cleanup goals for naphthalene and 2,4-dimethylphenol do not
correspond to risks within the EPA's acceptable risk range. If groundwater ICs were to change, cleanup
goals would need to be updated to levels that would protect human health and the environment.

The June 2018 Shallow Groundwater Monitoring Report notes that the chrysene cleanup goal was
changed from the 1998 OU-1 ROD's value of 20 |ag/L to 200 |-ig/L. This change was approved in a

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SCDHEC letter dated May 23, 2002. This cleanup goal change does not appear to have been
documented in an EPA decision document. During this FYR period, chrysene was typically not detected
except for the April 2020 Shallow Groundwater Sampling Event where chrysene was detected at
28 |ag/L in sentinel well LM-10AR. This is above the ROD cleanup goal but well below the recent
SCDHEC approved cleanup goal. Therefore, this cleanup goal change does not affect current
protectiveness. The cleanup goal change needs to be formalized in an EPA decision document.

Soil PRGs were based on risk rather than chemical specific ARARs. As part of this FYR, soil PRGs were
compared to current RSLs to see if the PRGs remain valid. The full evaluation is included in Tables 1-3
and 1-4 of Appendix I and indicates that PRGs remain valid. The ecological-based sediment cleanup
goals were reviewed and determined to be valid based on a comparison to current guidance levels
(Appendix I, Table 1-5).

Because VOCs are present in shallow groundwater at the Site, this FYR conducted a screening-level
evaluation to determine whether there may be unacceptable risks from the vapor intrusion pathway.
The screening-level vapor intrusion evaluation was performed using a commercial exposure scenario
and the highest detected concentrations of VOCs from April 2019 to April 2023. Benzene and
naphthalene concentrations were from the April 2019 shallow groundwater monitoring results for well
MM-03A. Ethylbenzene, toluene, and total xylene concentration were from the April 2022 shallow
groundwater monitoring results for well MM-03A. The evaluation indicated that vapor intrusion risks
are currently within or below the EPA's target risk ranges. The full evaluation is included in Table 1-2 of
Appendix I. Well MM-03A is near the DESC control building. As noted in the Site's 2009 Assessment of
Vapor Intrusion report (Technical Memorandum #004), the control building houses electrical
equipment and is highly ventilated to maintain appropriate operating temperatures. The building is
also not occupied on a full-time basis but is used intermittently to perform required maintenance and
monitoring tasks. Therefore, the vapor intrusion pathway does not currently present unacceptable risk
at the Site.

The RAOs used at the time of remedy selection remain valid.

QUESTION C: Has any other information come to light that could call into question the protectiveness
of the remedy?

No other information has come to light that could call into question the protectiveness of the remedy.

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VI. ISSUES/RECOMMENDATIONS

OU(s) without Issues/Recommendations Identified in the FYR:

None

Issues and Recommendations Identified in the FYR:

OU(s): OU-1

Issue Category: Monitoring

Issue: The 1998 ROD OU-1 chrysene cleanup goal of 20 ng/L was changed to 200
Hg/L. SCDHEC approved the change in a 2002 letter. The cleanup goal change was
not recorded in a decision document.

Recommendation: Record the chrysene cleanup goal of 200 ng/L in a decision
document.

Affect Current
Protectiveness

Affect Future
Protectiveness

Party Responsible

Oversight Party

Milestone Date

Yes

EPA

7/3/2028

OU(s): OU-1 and
OU-2

Issue Category: Institutional Controls

Issue: There are no remedial requirements for institutional controls for the
substation property soil, site-related groundwater contamination outside of the
substation property, or for the sediment caps.

Recommendation: Record the need for institutional controls for the
substation property soil, site-related groundwater contamination outside of the
substation property, and the sediment caps in a decision document.

Affect Current
Protectiveness

Affect Future
Protectiveness

Party Responsible

Oversight Party

Milestone Date

Yes

EPA

7/3/2028

Other Findings

Two additional recommendations were identified during the FYR. These recommendations do not
affect current and/or future protectiveness.

• Record the decision to remove nickel, beryllium, lead, mercury, chromium, copper, and arsenic
from the list of shallow groundwater COCs in a decision document.

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The cleanup goals for naphthalene and 2,4-dimethylphenol do not correspond to risks within
the EPA's acceptable risk range. If groundwater ICs were to change, cleanup goals would need
to be updated to levels that would protect human health and the environment.

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VII. PROTECTIVENESS STATEMENT

Protectiveness Statement(s)

Operable Unit:	Protectiveness Determination:

OU-1	Short-term Protective

Protectiveness Statement:

The remedy at OU-1 currently protects human health and the environment because
contaminated soil was excavated and disposed of off-site, DNAPL was removed during
excavation and continues to be removed via ongoing DNAPL recovery, shallow groundwater
monitoring, bioremediation products were put in backfill and injected into the subsurface,
and institutional controls are in place to prevent exposure to contaminated groundwater.
However, for the remedy to be protective over the long-term, the following action needs to
be taken;

•	Update the chrysene groundwater cleanup goal in a decision document.

•	Record the need for institutional controls for the substation property soil, for site-
related groundwater contamination outside of the substation property and for the
sediment caps in a decision document.

Protectiveness Statement(s)

Operable Unit:	Protectiveness Determination:

OU-2	Short-term Protective

Protectiveness Statement:

The remedy at OU-2 currently protects human health and the environment because
contaminated sediment was capped, intermediate groundwater monitoring is ongoing,
bioremediation products were put in backfill and injected into the subsurface, and
institutional controls are in place to prevent exposure to contaminated groundwater, ensure
the long-term integrity of the sediment caps and to prohibit activities that could potentially
disturb the caps. However, for the remedy to be protective over the long-term, the
following action needs to be taken:

• Record the need for institutional controls for the substation property soil, for site-
related groundwater contamination outside of the substation property and for the
sediment caps in a decision document.

Sitewide Protectiveness Statement

Protectiveness Determination:

Short-term Protective

Protectiveness Statement:

Because the remedies for OU-1 and OU-2 are protective in the short term, the sitewide
remedy is protective in the short term. For the sitewide remedy to be protective over

36

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the long term, the issues identified for OU-1 and OU-2 need to be addressed.
VIII. NEXT REVIEW

The next FYR for the Site is required five years from the completion date of this review.

37

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APPENDIX A - REFERENCE LIST

Explanation of Significant Differences. EPA. Calhoun Park Area Site, Charleston, South Carolina.
November 2005.

Fourth Quarter 2019 Progress Report. Calhoun Park Area Site Activities. Charleston,

South Carolina. Dominion Energy, South Carolina, Inc. January 29, 2020.

Fortieth DNAPL Removal Report. June 2021 through November 2021. DESC - Calhoun Park Area
Site, Charleston, South Carolina. April 26, 2022.

Forty-First DNAPL Removal Report. December 2021 through May 2022. DESC - Calhoun Park
Area Site, Charleston, South Carolina. October 17, 2022.

Forty-Second DNAPL Removal Report. June 2022 through November 2022. DESC - Calhoun Park
Area Site, Charleston, South Carolina. March 30, 2023.

Forty-Third DNAPL Removal Report. December 2022 through May 2023. DESC - Calhoun Park
Area Site, Charleston, South Carolina. November 9, 2023.

Interim Remedial Action Report, OU-1. Management and Technical Resources, Inc. Calhoun
Park Area Site, Charleston, South Carolina. August 2006.

Operable Unit #1 Shallow Groundwater Monitoring Results - April 2020 Event. Calhoun Park
Area Site, Charleston, South Carolina. July 2020.

Operable Unit #1 Shallow Groundwater Monitoring Results - April 2021 Event. Calhoun Park
Area Site, Charleston, South Carolina. August 2021.

Operable Unit #1 Shallow Groundwater Monitoring Results - April 2022 Event. Calhoun Park
Area Site, Charleston, South Carolina. August 2022.

Operable Unit #1 Shallow Groundwater Monitoring Results - May 2022 Event. Calhoun Park
Area Site, Charleston, South Carolina. October 2023.

Operable Unit #2 Intermediate Groundwater Monitoring Results - December 2019 Event.
Calhoun Park Area Site, Charleston, South Carolina. May 2020.

A-l

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Operable Unit #2 Intermediate Groundwater Monitoring Results - December 2020 Event.
Calhoun Park Area Site, Charleston, South Carolina. February 2021.

Operable Unit #2 Intermediate Groundwater Monitoring Results - November 2021 Event.
Calhoun Park Area Site, Charleston, South Carolina. February 2022.

Operable Unit #2 Intermediate Groundwater Monitoring Results - December 2022 Event.
Calhoun Park Area Site, Charleston, South Carolina. May 2023.

Record of Decision, OU-1. EPA. Calhoun Park Area Site, Charleston, South Carolina.

September 1998: Record of Decision, OU-2. EPA. Calhoun Park Area Site, Charleston,

South Carolina. September 2002.

Remedial Action Report, OU-2. Areas 1, 2 and 3 Sediments. Management and Technical
Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. November 2013.

Remedial Action Report, 002. Intermediate Groundwater. Management and Technical
Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. June 2007.

Reuse and the Benefit to Community - A Beneficial Effects Economic Case Study for the Calhoun
Park Area Site. EPA. 2020.

Second Five-Year Review Report. Operable Units 1 and 2. EPA. Calhoun Park Area Site,
Charleston, South Carolina. August 2014.

Technical Memorandum #004-Assessment of Vapor Intrusion. Management & Technical
Resources, Inc. Calhoun Park Area Site, Charleston, South Carolina. February 2009.

Third Five-Year Report for Calhoun Park Area. Charleston County, South Carolina.

August 15, 2019.

Thirty-Sixth DNAPL Removal Report. June 2019 through November 2019. DESC - Calhoun Park
Area Site, Charleston, South Carolina. March 30, 2020.

Thirty-Seventh DNAPL Removal Report. December 2019 through May 2020. DESC - Calhoun
Park Area Site, Charleston, South Carolina. October 27, 2020.

A-2

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Thirty-Eighth DNAPL Removal Report. June 2020 through November 2020. DESC - Calhoun Park
Area Site, Charleston, South Carolina. March 25, 2021.

Thirty-Ninth DNAPL Removal Report. December 2020 through May 2021. DESC - Calhoun Park
Area Site, Charleston, South Carolina. September 22, 2021.

A-3

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APPENDIX B - CURRENT SITE STATUS

Environmental Indicators

-	Current human exposures at the Site are under control.

-	Current groundwater migration is under control.

Are Necessary Institutional Controls in Place?

f ^ All Q Some Q None

| ~ Yes ^

Has EPA Designated the Site as Sitewide Ready for Anticipated Use?

No

Has the Site Been Put into Reuse?

fX Yes ~

No

B-l

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APPENDIX C - SITE CHRONOLOGY

Table C-l: Site Chronology

Event

Date

Manufactured gas plant operated on site

1855 - 1957

Contamination was discovered

May 22, 1991

The EPA conducted the Preliminary Assessment

September 4, 1991

The EPA conducted the Site Inspection

June 24, 1992

SCE&G entered into an Administrative Order with the EPA to perform
an Rl

January 22, 1993

The EPA approved SCE&G's Removal Action Work Plan

July 22, 1998

SCE&G completed the remedial investigation/feasibility study The EPA
issued the OU 1 ROD

September 30, 1998

Start of DNAPL removal

October 1998

Unilateral Administrative Order for OU 1

January 19,1999

SCE&G completed source removal activities completed - Phase 1
through VI

February 1999- June
2000

SCE&G completed remedial design

July 13, 2000

SCE&G completed phase VII source removal

April 2002

SCE&G completed the RI/FS forOU-2

March 9, 2002

The EPA issued the OU-2 ROD

September 24, 2002

Unilateral Administrative Order for OU-2

September 23, 2003

PRP Remedial Design (OU-2) start

October 13. 2003

PRP Remedial Design (OU-2 - Sediments) start

March 12, 2004

PRP Remedial Design (OU-2 - Sediments) Addendum

August 13, 2004

SCE&G completed phase VIII source removal

December 2004

The EPA issued an ESD for OU -1

November 7, 2005

SCE&G completed the OU-2 sediment remedial action in Area 2 and
Area 3

August 2006

Vapor intrusion Technical Memorandum submitted

February 2009

First FYR

August 26 2009

SCE&G completed the OU-2 sediment remedial action in Area 1

December 14 2012

Second FYR

August 22, 2014

Institutional controls implemented for the SCE&G property via a
Declaration of Covenants and Restrictions

September 2018

Third FYR

August 15, 2019

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APPENDIX D - PRESS NOTICE

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U.S. ENVIRONMENTAL PROTECTION AGENCY

NEWS RELEASE

EPA.GOV/NEWSRO

EPA to Review Cleanups at 40 Southeast Superfund Sites

Contact Information: region4press@epa.eov, 404-562-8400

ATLANTA (Oct. 19, 2023} - Today, the U.S. Environmental Protection Agency (EPA) announced that comprehensive reviews
will be conducted of completed cleanup work at 40 Superfund sites in the Southeast.

The sites, located in Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, and Tennessee, will
undergo a legally required Five-Year Review to ensure that previous remediation efforts at the sites continue to protect
public health and the environment.

"Five-Year Reviews are an integral part of the site remediation process because they help make sure remedies are still
protective," said Acting EPA Region 4 Administrator Jeaneanne Gettle. "The Southeast Region will benefit tremendously
from the full restoration of Superfund sites, which can become valuable parts of the community landscape."

The Superfund Sites where EPA will conduct Five-Year Reviews in Calendar Year 2024 are listed below. The web links
provide detailed information on site status as well as past assessment and cleanup activity. Once the Five-Year Review is
complete, its findings will be posted in a final report at https://www.epa.gov/superfund/search-superfund-five-year-
reviews.

Alabama

American Brass Property https://www.epa.gov/superfund/american-brass
Florida

Arkla Terra Property https://www.epa.gov/superfund/arkla-terra

Brown's Dump https://www.epa.gov/superfund/brown's-dump

City Industries, Inc. https://www.epa.gov/superfund/citv-industries-inc

Coleman-Evans Wood Preserving Co. https://www.epa.gov/superfund/coleman-evans-wood

Harris Corp. (Palm Bay Plant) https://www.epa,gov/superfund/harris-corporation-palm

Jacksonville Ash Site https://www.epa.gov/superfund/iacksonville-ash

Kassauf-Kimerling Battery Disposal https://www.epa.gov/superfund/kassauf-kimerling-th

Nocatee Hull Creosote https://www.epa.gov/superfund/nocatee-creosote

Pioneer Sand Co. https://www.epa.gov/superfund/pioneer-sand-companv

Piper Aircraft Corp./Vero Beach Water & Sewer Dept. https://www.epa.gov/superfund/piper-aircraft-corp

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Sandford Gasification Plant https://www.epa,gov/superfund/sanford-gasification
Sixty-Second Street Dump https://www.epa.gov/superfund/sixtv-second-street
Solitron Microwave https://www.epa.gov/superfund/solitron-niicrowave
Tyndall Air Force Base https://www.epa.gov/superfund/tyndall-air-force-base
United Metals, Inc. https://www.epa.gov/superfund/united-metals-inc
Whitehouse Oil Pits https://www.epa.gov/superfund/whitehouse-oil-pits

Georgia

Woolfolk Chemical Works, Inc. https://www.epa.gov/superfund/woolfolk-chemical-works
Kentucky

Airco https://www.epa.gov/superfund/airco

B. F. Goodrich https://www.epa.gov/superfund/bf-goodrich

Paducah Gaseous Diffusion Plant (USDOE) https://www.epa.gov/superfund/paducha-easeous-diffusjon-plant
Mississippi

Sonford Products https://www.epa.gov/superfund/sonford-products
North Carolina

General Electric Co/Shephard Farm https://www.epa.gov/superfund/general-electric-shepherd-farm
North Belmont PCE https://www.epa.gov/superfund/north-belmont-pce

South Carolina

Calhoun Park Area https://www.epa.gov/superfund/search-superfund-five-vear-reviews
Gieger ( C & M Oil) https://www.epa.gov/superfund/geiger

Helena Chemical Co. Landfill https://www.epa.gov/superfund/helena-cheniical-landfill
Lyman Dyeing and Finishing https://www.epa.gov/superfund/lvman-dyeing-finishing
Medley Farm Drum Dump https://www.epa.gov/superfund/medlev-farm-drum-dump

Savannah River Site (USDOE) https://www.epa.gov/superfund/savannah-river-site
WamChem, Inc. https://www.epa.gov/superfund/wamchem

Tennessee

American Creosote Works, Inc. (Jackson Plant) https://www.epa.gov/superfund/american-creosote-works-iackson
Oak Ridge Reservation (USDOE) https://www.epa.gov/superfund/oak-ridge-reservation

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Ross Metals Inc. https://www,epa,gov/superfund/ross-metals

Background

Throughout the process of designing and constructing a cleanup at a hazardous waste site, EPA's primary goal is to make
sure the remedy will be protective of public health and the environment. At many sites, where the remedy has been
constructed, EPA continues to ensure it remains protective by requiring reviews of cleanups every five years. It is important
for EPA to regularly check on these sites to ensure the remedy is working properly. These reviews identify issues (if any)
that may affect the protectiveness of the completed remedy and, if necessary, recommend action(s) necessary to
address them.

There are many phases of the Superfund cleanup process including considering future use and redevelopment at sites and
conducting post cleanup monitoring of sites. EPA must ensure the remedy is protective of public health and the
environment and any redevelopment will uphold the protectiveness of the remedy into the future.

The Superfund program, a federal program established by Congress in 1980, investigates and cleans up the most complex,
uncontrolled, or abandoned hazardous waste sites in the country and endeavors to facilitate activities to return them to
productive use. In total, there are more than 280 Superfund sites across the Southeast.

More information:

EPA's Superfund program: https://www.epa.gov/superfund

###

I

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APPENDIX E-SITE MAPS

E-l

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mm

Of£i||j
Trailer

jSontrM
Building

iFormer Ansonborough
i Homes Property





¦Charleston

Calhoun Park Area
Superfund Site
Charleston, Charleston County, SC
Site Location Map



KiMy 9S90& iriSsWfyi

Figure E-l: Site Location Map

E-2

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Area 2
Former Rail Spur Area

^^_Area 1
rmer Gas Holder Area

Area 5
m's Property

Area 3
Former Oil
Tank Area

¥ Area 6 NPS Property
Area 4 CM-05A

Figure E-2: Historical Site Map (Source: Management and Technical Resources, Inc.)

E-3

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APPENDIX F - INTERVIEW FORMS

F-l

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Interview Form for Five-Year Review

Site Name:	Calhoun Park Area

Interviewer's Name: Timothy Kadar	Affiliation: SCDHEC

Interviewee's Name: Sara Callahan	Affiliation: SCDHEC, Federal Remediation

Project Manager

Contact Information: SCDHEC

2600 Bull Street
Columbia, SC 29201
CallahSE(a)d hec.sc.gov

Type of Interview: Email
Date: January 2024

1.	What is your overall impression of the project, including cleanup, maintenance and reuse activities
(as appropriate)?

The Site remediation is progressing at an acceptable rate. The hydrology/geology of the Site is well
understood, and the groundwater contaminant plume is well defined as is the DNAPL. Current land
uses at the site include commercial and residential buildings, continued utility services, public and
educational services, recreational and cultural attractions and ecological projects.

2.	What is your assessment of the current performance of the remedy in place at the Site?

Pumping, chemical oxidant injection, and phytoremediation are effective in removing NAPL/DNAPL and
reducing groundwater contaminants. Between October 1998 and November 2023, approximately
52,113 gallons of NAPL/DNAPL have been recovered. Historical concentrations of the principal
groundwater contaminants, benzene and naphthalene, have fluctuated but show an overall
declining trend.

3.	Are you aware of any complaints or inquiries regarding site-related environmental issues or
remedial activities from residents in the past five years?

I am unaware of any complaints of inquiries regarding site-related environmental issues or remedial
activities associated with the Site.

4.	Has your office conducted any site-related activities or communications in the past five years? If
so, please describe the purpose and results of these activities.

SCDHEC has provided review and comments to EPA and the site contractor regarding progress reports,
groundwater monitoring results, and DNAPL removal reports: SCDHEC has also participated in

F-2

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conference calls and site visits to monitor the status of site remediation. On February 14, 2024,
SCDHEC, EPA, and the contractors conducted a site inspection for the 2024 FYR.

5.	Are you aware of any changes to state laws that might affect the protectiveness of the Site's
remedy?

No.

6.	Are you comfortable with the status of the institutional controls at the Site? If not, what are the
associated outstanding issues?

I am comfortable with the status of the institutional controls at the Site.

7.	Are you aware of any changes in projected land use(s) at the Site?

I am not aware of any changes in the projected land use(s) at the Site.

8.	Do you have any comments, suggestions or recommendations regarding the management or
operation of the Site's remedy?

I have no comments or suggestions regarding the management or operations of the Site remedy. The
extraction of DNAPL is effective. The schedule of DNAPL removal and groundwater sampling has
been optimized.

F-3

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Interview Form for Five-Year Review

Site Name: Calhoun Park Area
Interviewer's Name: Timothy Kadar
Interviewee's Name: Thomas Effinger

Affiliation: SCDHEC
Affiliation: DESC South Carolina

Contact Information: thomas.effinger@dominionenergy.com
Type of Interview: Email
Date: February 20, 2024

1.	What is your overall impression of the remedial activities at the Site?

Dominion Energy South Carolina (DESC) has and continues to work hard to remediate various
impacted media at the Site, while maintaining the safe operation of a critically important electrical
substation. The on-going site work is being completed with minimal disruption to the surrounding
community. The completed and on-going remedial activities continue to be protective of the
environment, practical (given site limitations), and cost-effective.

2.	What have been the effects of this Site on the surrounding community, if any?

Since the late 1990's, integrating site remediation with redevelopment allowed the remedy to
proceed during other project construction and development activities which in-turn helped
support many beneficial property reuse improvements for the surrounding community.

Completed Site redevelopment activities include a parking garage, the South Carolina Aquarium
and open green space used for various community events, an office/shopping facility, and the
National Park Service's Fort Sumter tour boat facility. The Charlotte Street Park, which includes an
observation deck extending over the Cooper River, was completed and future development plans
for the site include an outdoor venue or other amenities to support the growing local economy
and tourism to the area.

3.	What is your assessment of the current performance of the remedy in place at the Site?

The remedy in place at the Site is meeting and achieving the remedial objectives of the Record of
Decision (ROD). Dense Non-Aqueous Phase Liquids (DNAPL) continue to be removed from various
locations throughout the site and elevated groundwater constituents continue to attenuate as a
result. The total DNAPL removed is over 52,000 gallons and continues.

4.	Are you aware of any complaints or inquiries regarding environmental issues or the
remedial action from residents since implementation of the cleanup?

There have been no complaints but there have been several inquiries from various property
owners since the implementation of the cleanup, which began in 1998. Currently, DESC is not
aware of any unresolved environmental issues with any residents.

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5.	Do you feel well informed regarding the Site's activities and remedial progress? If not, how
might EPA convey site-related information in the future?

Yes, I am very well informed of the site's activities and remedial progress.

6.	Do you have any comments, suggestions or recommendations regarding the management or
operation of the Site's remedy?

I believe that the operation of the Site remedy is both protective of the environment and cost
effective. There may be opportunities for improvement in monitoring and reporting since the site
has such a long history of data collection and observed positive trends. Optimization is believed to
be appropriate for the shallow and intermediate groundwater monitoring and reporting as well as
for the routine quarterly reports. We are discussing ways to streamline these measures with the
state and federal agencies and have received constructive feedback. We are also looking at
proper abandonment of groundwater wells that are no longer relevant.

7.	Do you consent to have your name included along with your responses to this questionnaire in
the FYR report?

Yes.

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Interview Form for Five-Year Review

Site Name: Calhoun Park Area
Interviewer's Name: Timothy Kadar
Interviewee's Name: Rusty Contrael

Affiliation: SCDHEC
Affiliation: Ace, Inc. Contact

Information: rcontrael@ace-mgp.com

Type of Interview: Email
Date: February 27, 2024

1.	What is your overall impression of the project; including cleanup, maintenance, and reuse
activities (as appropriate)?

My overall impression of the project is that the initial cleanup activities were completed to the
maximum extent practicable given the logistical constraints and geological challenges
encountered at this Site. The on-going operation and maintenance (O&M) activities continue to
be efficient and cost-effective, based largely on the volume of dense, non-aqueous phase liquid
(DNAPL) that continues to be recovered. The potential for Site reuse has been maximized. The
site was awarded the "Excellence in Site Reuse" from the EPA in 2012.

2.	What is your assessment of the current performance of the remedy in place at the Site?

The remedy is performing as intended and providing sufficient protection of human health and
the environment.

3.	What are the findings from the monitoring data? What are the key trends in
contaminant levels that are being documented over time at the Site?

Based on the on-going DNAPL Monitoring and Recovery Program, DNAPL continues to be
recovered to the maximum extent practicable, consistent with the first objective of the Record
of Decision (ROD) for the Site. As of the end of May, 2023 over 52,000 gallons of DNAPL has
been recovered from the Site.

Based on the groundwater monitoring programs:

•	DNAPL and impacted groundwater migration is not occurring; and

•	The overall extent of groundwater impacts and constituent concentrations continues to
decrease.

For the OU #1 shallow zone groundwater, flow patterns remain fairly consistent, while benzene
and naphthalene concentrations continue to trend downward (with some variation).

F-6

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For the OU #2 intermediate zone groundwater, flow patterns are also remaining consistent,
while overall, benzene and naphthalene concentrations continue to trend downward (with
some variation).

The overall groundwater monitoring program is effective and efficient in providing accurate
documentation of key trends in contaminant levels.

4. Is there a continuous on-site O&M presence? If so, please describe staff responsibilities and
activities. Alternatively, please describe staff responsibilities and the frequency of site
inspections and activities if there is not a continuous on-site O&M presence.

Yes - There is a very consistent O&M presence at the Site with environmental personnel on site
for approximately 2 weeks, then off-site for 1 week. This off-site period, (approximately 10 days
including the weekends) provides ample time for DNAPL to re-accumulate in the subsurface
collection/containment system, thereby increasing the efficiency for removal. Staff
responsibilities include: DNAPL measurement, maintenance, and removal activities from various
site-wide locations, maintaining the shallow and intermediate groundwater sampling program,
providing environmental support for other intrusive field activities related to the operation of
the electrical substation/equipment and maintaining the Site facilities.

Providing support for other intrusive field activities, (i.e. future construction worker protection
[including the future utility worker]) was another important objective for the overall remedial
approach at the Site. Having established the protocols and procedures for providing
environmental support for the installation of new or updated substation equipment allows DESC
to fulfill its' commitment to continue to provide efficient and reliable electrical service to
Charleston and the surrounding community.

Periodically, when intrusive activities are required by substation personnel, on-site,
environmental O&M personnel will typically conduct a health and safety briefing for the
electrical utility workers and any subcontractors that may also be working in the substation.
Oversight tasks will also include monitoring the intrusive work area and being prepared to
appropriately manage any impacted material that may be generated during construction
activities. By having the O&M workers routinely on site allows DESC to provide environmental
support for substation expansion and is fully consistent with the intent of the remedy to be
protective of "a future construction worker."

5. Have there been any significant changes in site O&M requirements, maintenance schedules
or sampling routines since start-up or in the last five years? If so, do they affect the
protectiveness or effectiveness of the remedy? Please describe changes and impacts.

In general, there have been no significant changes in the O&M requirements associated
with the Site-Wide DNAPL recovery program within the last five years. In July 2010, the
schedule for site O&M personnel staffing was reduced to the 2-week on and 1-week off

F-7

-------
pumping schedule discussed above. This reduction in labor has continued to result in more
DNAPL volume being recovered per pumping event, while reducing labor and overall site
costs. The DNAPL recovery O&M schedule is evaluated periodically and has remained
essentially the same for this 5-year review period.

Tradebe Treatment and Recycling of Tennessee, LLC was utilized as the approved recycling
facility for the recovered DNAPL through June 2021. Based on several factors, DESC
determined that the Giant Resource Recovery-Sumter, Inc. (GRR-Sumter) facility in Sumter,
South Carolina would be a suitable alternative to utilize as the facility for the recovered
DNAPL in their fuel blending process. Following the approval process, U.S. EPA and SCDHEC
were notified of the change in the Fourth Quarter of 2021 Progress Report submitted on
January 24, 2022.

Regarding the shallow groundwater monitoring program, the sampling frequency was
reduced to an annual event from a 9-month sampling interval in April of 2019, based on
regulatory approval dated January 9, 2019. This approval also included sampling of the
sentinel wells on a biennial basis (i.e. every other year). These changes have resulted in cost
savings and improved efficiency of the program.

For the intermediate groundwater monitoring program, similar optimizations/reductions
have been proposed and implemented. In May of 2019, DESC requested that the
intermediate groundwater monitoring program be reduced from a semi-annual frequency
to an annual basis along with other requested modifications/reductions. In June 2019,
SCDHEC concurred with the request including:

• Reducing sampling frequency to annual events;

• Reducing the sampling of sentinel wells to biannual;

• Eliminating 2,4 dimethylphenol from the sampling program;

• Eliminating 13 of 14 wells recommended for collecting groundwater elevations; and

• Subsequently, removal of MM-14C from the annual sampling program.

Overall, the primary objective of the ROD (DNAPL removal to the maximum extent
practicable) continues to be achieved. The groundwater monitoring programs have been
optimized over the years and are focused and cost-effective. The protectiveness or
effectiveness of the remedy has not been adversely affected by these changes.

6. Have there been unexpected O&M difficulties or costs at the Site since start-up or in the
last five years? If so, please provide details.

There have been no unexpected O&M difficulties or costs at the Site since start-up or in the
last five years. However, it should be noted that the facility used for DNAPL recycling has
changed over the years and transportation and handling costs have increased.

F-8

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7.	Have there been opportunities to optimize O&M activities or sampling efforts?

Please describe changes and any resulting or desired cost savings or improved
efficiencies.

Yes. As stated above and with agency approval, the shallow and intermediate groundwater
monitoring programs were reduced to annual events. Additional changes that have
resulted in optimization include sampling the sentinel groundwater monitoring wells every
other year and eliminating constituents from the parameter lists to provide further focus to
the monitoring program. These changes have resulted in cost savings and improved
efficiency.

8.	Do you have any comments, suggestions or recommendations regarding O&M
activities and schedules at the Site?

Yes, there are a number of groundwater monitoring wells at the Site that are no longer
essential to the monitoring programs and these wells should be properly abandoned.
Additionally, the current groundwater monitoring programs should be evaluated and
recommendations to reduce sampling frequencies, locations and constituents may
be warranted.

Other changes may be appropriate in the future and will be presented to EPA and SCDHEC if
justified, to provide for continuous improvement and optimization of the programs.

9.	Do you consent to have your name included along with your responses to this questionnaire in
the FYR report?

Yes

F-9

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APPENDIX G - SITE INSPECTION CHECKLIST

Site Name: Calhoun Park Area

Date of Inspection: 2/14/2024

Location and Region: Charleston, South Carolina,
Region 4

EPA ID:SCD987581337

Agency, Office or Company Leading the Five-Year
Review: EPA Region 4

Weather/Temperature: 60's and mostly sunny

Remedy Includes: (Check all that apply)

I I Landfill cover/containment
I I Access controls
15^1 Institutional controls
I I Groundwater pump and treatment
I I Surface water collection and treatment

15^1 Other: DNAPL extraction, sediment capping, contaminated soil removal. Phvtoremediation and in-situ
groundwater treatment.

I I Monitored natural attenuation
I I Groundwater containment
I I Vertical barrier walls

Attachments: Q Inspection team roster attached

I I Site map attached

II. INTERVIEWS (check all that apply)

1. O&M Site Manager Tom Effinger Dominion Energy SC. Inc 2/15/2024

Name Title Date
Interviewed Q] at site Q] at office ^ by email Phone:

Problems, suggestions ^ Report attached: Interview responses are included in Appendix E and summarized in
section IV of this FYR.

2. O&M Staff

Ace, Inc.

2/27/2024
Date

Rusty Contrael

Name Title
Interviewed Q at site Q] at office ^ by email Phone:

Problems/suggestions Q Report attached: Interview responses are included in Appendix E and summarized in

jg£ii£nJy=2flhl!=EX!L

3. Local Regulatory Authorities and Response Agencies (i.e., state and tribal offices, emergency response

office, police department, office of public health or environmental health, zoning office, recorder of deeds, or
other city and county offices). Fill in all that apply.

Agency SCDHEC
Contact Sara Callahan
Name

Problems/suggestions Q] Report attached:

Project

Manager

Title

2/14/2024
Date

Phone No.

Agency _
Contact

Name

Title

Problems/suggestions Q Report attached:_

Date

Phone No.

Other Interviews (optional) Q] Report attached:.

I. ON-SITE DOCUMENTS AND RECORDS VERIFIED (check all that apply)

1. O&M Documents

15^1 O&M manual

Readily available

Up to date

~ N/A

G-l

-------
153 As-built drawings ^ Readily available

153 Up to date

~ N/A

153 Maintenance logs ^ Readily available

1X1 Up to date



N/A

Remarks:







2. Site-Specific Health and Safety Plan

153 Readily available

153 Up to date

~ n/a

153 Contingency plan/emergency response plan

153 Readily available

IXI Up to date

~ n/a

Remarks:







3. O&M and OSHA Training Records

153 Readily available

153 Up to date

~ n/a

Remarks:







4. Permits and Service Agreements







1 1 Air discharge permit

1 1 Readily available

1 1 Up to date

~ n/a

1 1 Effluent discharge

1 1 Readily available

1 1 Up to date

~ n/a

|	| Waste disposal, POTW

1 1 Readily available

1 1 Up to date

~ n/a

153 Other permits: See Below

153 Readily available

1 1 Up to date

~ n/a

Remarks: While not required by the remedy, after on-site filtration, the PRP discharges any wastewater

generated on site to the publicly-owned treatment works under a temporary discharge permit.



5. Gas Generation Records

1 1 Readily available

1 1 Up to date

|KI N/A

Remarks:







6. Settlement Monument Records

1 1 Readily available

1 1 Up to date

|KI N/A

Remarks:







7. Groundwater Monitoring Records

153 Readily available

153 Up to date

~ n/a

Remarks:







8. Leachate Extraction Records

1 1 Readily available

1 1 Up to date

|KI N/A

Remarks:







9. Discharge Compliance Records







~ Air 1 1 Readily available

1 1 Up to date

M

N/A

1 1 Water (effluent) ~ Readily available

1 1 Up to date



N/A

Remarks:







10. Da ily Access/Secu rity Logs

153 Readily available

153 Up to date

~ n/a

Remarks:







IV. O&M COSTS

1. O&M Organization







1 1 State in-house ~ Contractor for state





1 1 PRP in-house £

3 Contractor for PRP





1 1 Federal facility in-house ~ Contractor for Federal facility



~







G-2

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2.	O&M Cost Records

EH Readily available	I I Up to date

I I Funding mechanism/agreement in place ^ Unavailable

Original O&M cost estimate:	EH Breakdown attached

3.	Unanticipated or Unusually High O&M Costs during Review Period

Describe costs and reasons: Not Applicable

V. ACCESS AND INSTITUTIONAL CONTROLS ^ Applicable ~ N/A

A.	Fencing

1. Fencing Damaged	EH Location shown on site map 15^1 Gates secured ~ N/A

Remarks:	

B.	Other Access Restrictions

1. Signs and Other Security Measures	EH Location shown on site map ~ n/a

Remarks: Clear signage at locked front gate.

C.	Institutional Controls (ICs)

Implementation and Enforcement

Site conditions imply ICs not properly implemented	~ Yes No ~ N/A

Site conditions imply ICs not being fully enforced	~ Yes No EH N/A

Type of monitoring (e.g., self-reporting, drive by): Self Reported
Frequency: Annually
Responsible party/agency: RP

Contact 							

Name Title

Date



Phone no.

Reporting is up to date

lElYes

~

No

EH N/A

Reports are verified by the lead agency

EH Yes

~

No

IEI N/A

Specific requirements in deed or decision documents have been
met

EH Yes

~

No

|KI N/A

Violations have been reported

EH Yes

~

No

|KI N/A

Other problems or suggestions: | | Report attached









2. Adequacvl^l ICs are adequate	I I ICs are inadequate	~ n/a

Remarks: Institutional controls are in place and adequate for the Site. See the Institutional Control Review
section of this FYR for additional details.

D. General

1.	Vandalism/Trespassing EH Location shown on site map 15^1 No vandalism evident
Remarks:	

2.	Land Use Changes On Site	^ N/A

Remarks:	

G-3

-------
3. Land Use Changes Off Site	^ N/A

Remarks:	

VI. GENERAL SITE CONDITIONS

A.	Roads	Applicable ^ N/A

1. Roads Damaged	Q Location shown on site map I I Roads adequate ~ n/a

Remarks:	

B.	Other Site Conditions

Remarks:	

VII. LANDFILL COVERS ~ Applicable ^ N/A

VIII.	VERTICAL BARRIER WALLS ~ Applicable ^ N/A

IX.	GROUNDWATER/SURFACE WATER REMEDIES ^ Applicable ~ N/A

A.	Groundwater Extraction Wells, Pumps and Pipelines	^ Applicable ~ n/a

1.	Pumps, Wellhead Plumbing and Electrical

15^1 Good condition	All required wells properly operating Q] Needs maintenance ~ n/a

Remarks:

2.	Extraction System Pipelines, Valves, Valve Boxes and Other Appurtenances

Good condition	I I Needs maintenance

Remarks: Extraction is DNAPL rather than groundwater

3.	Spare Parts and Equipment

15^1 Readily available	Good condition	Q] Requires upgrade Q] Needs to be provided

Remarks:

B.	Surface Water Collection Structures, Pumps and Pipelines Q Applicable ^ N/A

1.	Collection Structures, Pumps and Electrical

I I Good condition	I I Needs maintenance	

2.	Surface Water Collection System Pipelines, Valves, Valve Boxes and Other Appurtenances

Good condition	I I Needs maintenance

Remarks:	

3.	Spare Parts and Equipment

I I Readily available	Q] Good condition	Q] Requires upgrade Q] Needs to be provided

Remarks:	

C.	Treatment System	Q Applicable ^ N/A
1. Treatment Train (check components that apply)

I I Metals removal	Q] Oil/water separation	Q] Bioremediation

Air stripping	I I Carbon adsorbers

G-4

-------
I-! Filters:



1 1 Additive (e.g., chelation agent, flocculent):



I-! Others:



1 1 Good condition Q] Needs maintenance



1 1 Sampling ports properly marked and functional



1 1 Sampling/maintenance log displayed and up to date



1 1 Equipment properly identified



1 1 Quantity of groundwater treated annually:



1 1 Quantity of surface water treated annually:



Remarks:



2. Electrical Enclosures and Panels (properly rated and functional)



15^1 N/A Good condition Q] Needs maintenance



Remarks:



3. Tanks, Vaults, Storage Vessels



^ N/A Good condition 1 1 Proper secondary containment

1 1 Needs maintenance

Remarks:



4. Discharge Structure and Appurtenances



15^1 N/A Good condition Q] Needs maintenance



Remarks:



5. Treatment Building(s)



15^1 N/A Good condition (esp. roof and doorways)

1 1 Needs repair

1 1 Chemicals and equipment properly stored



Remarks:



6. Monitoring Wells (pump and treatment remedy)



15^1 Properly secured/locked ^ Functioning ^ Routinely sampled

15^1 Good condition

15^1 All required wells located Q] Needs maintenance

~ N/A

Remarks:



D. Monitoring Data

1. Monitoring Data



15^1 Is routinely submitted on time ^ Is of acceptable quality

2. Monitoring Data Suggests:



15^1 Groundwater plume is effectively contained Q] Contaminant concentrations are declining

E. Monitored Natural Attenuation

G-5

-------
1. Monitoring Wells (natural attenuation remedy)

I I Properly secured/locked Q] Functioning Q] Routinely sampled Q] Good condition

All required wells located Q] Needs maintenance 15^1 N/A

Remarks:

X. OTHER REMEDIES

If there are remedies applied at the site and not covered above, attach an inspection sheet describing the
physical nature and condition of any facility associated with the remedy. An example would be soil vapor

extraction.

XI. OVERALL OBSERVATIONS

A . Implementation of the Remedy

Describe issues and observations relating to whether the remedy is effective and functioning as designed. Begin
with a brief statement of what the remedy is designed to accomplish (e.g., to contain contaminant plume,
minimize infiltration and gas emissions).

The remedy appears to be functioning as intended. Past soil removal actions addressed soil contamination.
Contaminated sediments were capped, and products were injected to groundwater to enhance contamination
degradation. DNAPL removal is ongoing. Groundwater monitoring continues. Institutional controls are in place
to

prevent exposure to remaining site-related contamination. Phvtoremediation is in place via tree plantings to
improve groundwater quality.

B . Adequacy of O&M

Describe issues and observations related to the implementation and scope of O&M procedures. In particular,
discuss their relationship to the current and long-term protectiveness of the remedy.

The PRP contractor maintains the Site, associated structures, grounds, fencing, pumping equipment, and
monitoring wells in good and operable condition.

C . Early Indicators of Potential Remedy Problems

Describe issues and observations such as unexpected changes in the cost or scope of O&M or a high frequency
of unscheduled repairs that suggest that the protectiveness of the remedy may be compromised in the future.
The OU-2 ROD estimated that intermediate groundwater monitoring would be needed for 12 years based on the
expected effects of in-situ treatment. Injections occurred in 2005 and 2006 and COC concentrations in some
intermediate groundwater monitoring wells are still not trending downwards.

D . Opportunities for Optimization

Describe possible opportunities for optimization in monitoring tasks or the operation of the remedy.

None

Site Inspection Participants:

Allan Hernandez, EPA
Thomas Effinger, DESC
Rusty Contrael, ACE
Sara MacDonald, SCDHEC
Sara Callahan, SCDHEC
Billy Britton, SCDHEC
Timothy Kadar, SCDHEC

G-6

-------
APPENDIX H - DETAILED ARARs REVIEW

Appendix H includes a review of relevant, site-related documents including the RODs, AROD, remedial
action reports and recent monitoring data. CERCLA Section 121(d)(1) requires that Superfund remedial
actions attain "a degree of cleanup of hazardous substance, pollutants, and contaminants released into
the environment and of control of further release at a minimum which assures protection of human
health and the environment." The remedial action must achieve a level of cleanup that at least attains
those requirements that are legally applicable or relevant and appropriate. In performing the FYR for
compliance with ARARs, only those ARARs that address the protectiveness of the remedy are reviewed.

• Applicable requirements are those cleanup standards, standards of control, and other
substantive requirements, criteria or limitations promulgated under federal environmental or
state environmental or facility siting laws that specifically address a hazardous substance,
remedial action, location, or other circumstance found at a CERCLA site.

• Relevant and appropriate requirements are those standards that, while not "applicable,"
address problems or situations sufficiently similar to those encountered at the CERCLA site that
their use is well suited to the particular site. Only those state standards that are more stringent
than federal requirements may be applicable or relevant and appropriate.

• To-Be-Considered (TBC) criteria are non-promulgated advisories and guidance that are not
legally binding but should be considered in determining the necessary remedial action. For
example, TBCs may be particularly useful in determining health-based levels where no ARARs
exist or in developing the appropriate method for conducting a remedial action.

Chemical-specific ARARs are health- or risk-based numerical values or methodologies which, when
applied to site-specific conditions, result in the establishment of numerical values. These values
establish an acceptable amount or concentration of a chemical that may remain in, or be discharged
to, the ambient environment. Examples of chemical specific ARARs include Maximum Contaminant
Levels (MCLs) under the federal Safe Drinking Water Act and ambient water quality criteria
enumerated under the federal Clean Water Act (CWA).

Action-specific ARARs are technology- or activity-based requirements or limits on actions taken with
respect to a particular hazardous substance. These requirements are triggered by a remedial activity,
such as discharge of contaminated groundwater or in-situ remediation.

Location-specific ARARs are restrictions on hazardous substances, or the conduct of the response
activities solely based on their location in a special geographic area. Examples include restrictions on
activities in wetlands, sensitive habitats, and historic places.

Remedial actions are required to comply with the chemical specific ARARs identified in the ROD. In
performing the five-year review for compliance with ARARs, only those ARARs that address the
protectiveness of the remedy are reviewed (Tables H-l through H-5).

H-l

-------
Table H-l: Chemical Specific ARARs

Standard, Requirement, or Criterion

Description

Citation

WATER REGULATIONS (Safe Drinking Water Act - 40 USC ' 300; Clean Water Act - 33 USC Section 1251-1376)

Federal Groundwater Classification

Federal classification system to establish groundwater
usage categories for aquifers as part of a groundwater
protection strategy.

55 FR Part 8733

National Primary Drinking Water Regulations

Establishes maximum contaminant levels (MCLs) for
specific chemicals to protect drinking water quality.

40 CFR 141.61

Effluent Guidelines and Standards:
Pretreatment Standards

Discharges of extracted/treated Groundwater will be
subject to Pretreatment requirements if discharged to
the publicly owned treatment works.

40 CFR 403

South Carolina MCLs in Drinking Water

Establishes maximum contaminant levels (MCLs) for
specific chemicals to protect drinking water quality.

SCDHEC R. 61- 58.5

H-2

-------
Table H-2: Location Specific ARARs

Standard, Requirement, or Criterion

Description

Citation

Fish and Wildlife Coordination Act

The Act allows the Department of
Agriculture and Commerce to assist
Federal and State agencies to study the
effects of domestic sewage, trade wastes,
and other polluting substances on wildlife.

16 USC Sections 661 to 667e

Protection of Wetlands

Requires federal agencies to take action to
avoid adversely affecting wetlands, to
minimize wetlands destruction, and to
preserve the value of wetlands.

(Executive Order 11990; 40 CFR 6.302
(a); 40 CFR Part 6, Appendix A)

Table H-3: Action Specific ARARs

Standard, Requirement, or Criterion

Description

Citation

Installation of Monitoring Wells

Requirements for installation of wells

SC Well Standards
(R.61-71)

Groundwater ARARs

The 1998 ROD for OU-1 and the 2002 ROD for OU-2 identified multiple potential chemical specific ARARs for groundwater. However, only
the following ARAR was used as basis for selection of groundwater cleanup goals:

• National Primary Drinking Water Standards (MCLs) (40 CFR Part 141, Subpart B and G)

Several compounds did not have MCLs and risk-based numbers were derived for these compounds (see the toxicity review for these
compounds in Appendix I). This FYR compared groundwater ARARs in the 1998 ROD for OU-1 and the 2002 ROD for OU-2 against the
current values of these ARARs (see Table H-4). None of the ARARs have changed with the exception of arsenic. However, arsenic was
removed from the COC list in 2002, as the EPA and SCDHEC agreed that arsenic should be removed from the COCs based on the limited
number of groundwater samples with arsenic concentrations above the MCL of 0.01 mg/L and the potential contribution of arsenic from
non-site sources. In addition, no new MCLs have been established for those remedial goals originally based on risk.

H-3

-------
Table H-4: Groundwater ARAR Review

Contaminant

Media/OU

ROD Cleanup
Levels
(Hg/L)a

Current ARAR
(MCL)
(Hg/L)b

ARARs More or Less
Stringent than Cleanup
Levels?

Arsenic

Shallow Groundwater/OU-1

50

10

More stringent

Cyanide

Shallow Groundwater/OU-1

200

200

No change

Benzene

Shallow Groundwater/OU-1
Intermediate Groundwater/OU-2

5

5

No change

Benzo(a)pyrenec

Shallow Groundwater/OU-1
Intermediate Groundwater/OU-2

0.2

0.2

No change

Ethyl benzene

Shallow Groundwater/OU-1
Intermediate Groundwater/OU-2

700

700

No change

Beryllium

Shallow Groundwater/OU-1

4

4

No change

Leadd

Shallow Groundwater/OU-1

15

15

No change

Mercury

Shallow Groundwater/OU-1

2

2

No change

Chromium

Shallow Groundwater/OU-1

100

100

No change

Copper

Shallow Groundwater/OU-1

1300

1300

No change

Toluene

Shallow Groundwater/OU-1
Intermediate Groundwater/OU-2

1000

1000

No change

Xylenes (total)

Intermediate Groundwater/OU-2

10000

10000

No change

Notes:

a)	Cleanup goals from 1998 OU-1 ROD and 2002 OU-2 ROD.

b)	Listed values are MCLs from https://www.eDa.gov/ground-water-and-drinking-water/table-regulated-drinking-water-contaminants, accessed 1/08/24.

c)	Represents PAHs as a group.

d)	Lead is regulated by a treatment technique that requires systems to control the corrosiveness of their water. If more than 10 percent of tap water samples
exceed the action level, water systems must take additional steps. For lead, the action level is 15 ng/L.

|jg/L = micrograms per liter

H-4

-------
APPENDIX I - TOXICITY ASSESSMENT

Groundwater Cleanup Goals Toxicity Assessment

No new exposure pathways were identified. No new methodologies to determine risk more accurately
were identified during this Five-Year Review. Groundwater cleanup goals based on the National
Primary Drinking Water Regulations MCLs were evaluated in Appendix H and are not addressed
further. 2,4-Dimethylphenol, carbazole, chrysene, naphthalene, and nickel use health-based values for
the cleanup goal.9 To evaluate whether the health-based cleanup goals remain valid, the cleanup goals
without current MCLs were compared to the EPA's RSLs for tapwater.

The RSLs for cancer are chemical-specific concentrations for individual contaminants that correspond
to an excess cancer risk level of 1 x 10"6 (or a hazard quotient of 1 for non-carcinogens), and they have
been developed for a variety of exposure scenarios (e.g., residential, commercial/industrial). RSLs are
not de facto cleanup standards for a Superfund site, but they do provide a good indication of whether
actions may be needed to address potential human health exposures. The EPA acceptable risk range is
between 1 x 10"6 and 1 x 10"4. RSL values that are within this range are determined from a risk
standpoint to be acceptable.

Remediation levels (RLs) are chosen by the risk manager for COCs and are included in the Proposed
Plan and the ROD. These values, derived from site specific Remedial Goals or chemical specific ARARs,
are considered the levels the remedial action needs to achieve in order to be protective of human
health risks. If a chemical specific risk-based value other than lxlO6 for carcinogens or HQ of 1 is
recommended and/or selected as the RG, the FS, Proposed Plan, and ROD should provide a justification.

As shown in Table 1-1, the health-based cleanup goals remain valid except for the noncancer risk from
2,4-dimethylphenol and the noncancer and cancer risk from naphthalene. Tapwater RSLs are
conservative screening levels for drinking water, and the groundwater at the Site is not used for
drinking; therefore, this does not affect current protectiveness. However, the cleanup goals for
naphthalene and 2,4-dimethylphenol do not correspond to risks within the EPA's acceptable risk range;
the EPA may reevaluate these cleanup goals to determine if they warrant updating.

Table 1-1: Review of Groundwater Cleanup Goals

Groundwater COC

Media/OU

ROD
Cleanup
Goal

Tap Water RSL3

Cancer
Riskb

Noncancer
Hazard
Quotient
(HQ)C

1 x 10"6 Risk

HQ-1.0

2,4-Dimethylphenol

Shallow groundwater/OU-l &
Intermediate groundwater/ OU-2

700

360

Carbazole

Shallow groundwater/ OU-l &
Intermediate groundwater/OU-2

Chrysene

Sha How ground water/ OU-l

8.0 X 10 7

Chrysene

Shallow groundwater/ OU 1

200d

8.0 X 106

Naphthalene

Shallow groundwater/ OU-l &
Intermediate groundwater/ OU-2

1,500

0.17

6.1

8.8 X 10'3

246

Nickel

Shallow groundwater/ OU-l

100

390

0.3

Notes:

a. Current EPA RSLs. dated November 2023. are available at httD://www2.eDa.eov/risk/risk-based-screenine-table-
seneric-tables (last accessed 1/9/2023).

b. The cancer risks were calculated using the following equation, based on the fact that RSLs are derived based on 1
x 10 6 risk: cancer risk = (cleanup goal cancer-based RSL) x 10 6.

c. The noncancer HQs were calculated using the following equation: HQ = cleanup goal noncancer based RSL.

d. The ROD cleanup goal for chrysene was 20 ng/L, but the June 2018 Shallow Groundwater Monitoring Report
notes that the chrysene cleanup goal was changed to 200 ng/L and that this was approved in a SCDHEC letter
dated May 23, 2002. Both values are reviewed in this screening-level risk evaluation.

e. Nickel as soluble salts.

- = EPA has not yet established toxicity values.

Bold = exceeds EPA's acceptable carcinogenic risk range (1 x 104 to 1 x 10-6) or the noncancer HQ of 1.

ug/L = micrograms per liter

9 The cleanup goal for nickel was originally MCL-based, but nickel no longer has an MCL and is therefore evaluated with
health-based cleanup goals.

1-1

-------
Vapor Intrusion Screening Level Risk Assessment

VOCs are present in groundwater at the Site. This FYR evaluates whether there are unacceptable risks
from the vapor intrusion pathway based on current toxicity information and groundwater data. A
screening-level vapor intrusion evaluation was performed using the most recent groundwater data
from May 2023 under a commercial exposure scenario. The highest groundwater concentrations of
each contaminant from the shallow wells were compared to conservative Vapor Intrusion Screening
Levels (VISLs). The results of the screening indicate that the cumulative risk for all contaminants is
within the EPA's risk range of 1 x 10~6 to 1 x 10~4 and equals the cumulative noncancer hazard quotient
(HQ) target of 1 (Table 1-2).

Table 1-2: Vapor Intrusion Evaluation - From April 2019 to April 2023

Maximum Concentration

VISL Calculator13

coc

from Shallow Welis in May

2023 (pg/L)a

Predicted Indoor Air

Commercial

Concentration (p.g/m3)

Cancer Risk

Noncancer HQ

Benzene

139

31.5

2.01 x 10"5

2.40 x 101

Ethyl benzene

47.7

15.4

3.13 x 10"6

3.51 x 10"3

Toluene

3.8

1.74 x 10"4

Total xylenes

66.6

18.1

4.12 x 10"2

Totals:

2.32 x 10"5

2.85 x 101

Notes:

a. Maximum concentration for each COC from this sampling event used. Only detected volatile contaminants were
included in this evaluation. Groundwater data are from Table 6 of the Shallow Groundwater Monitoring Results
May 2023 Event Report.

lb. Only volatile contaminants with established toxicity criteria for indoor air are included in this evaluation. VISL
calculator last accessed 1/9/2024 at https://www.epa.gov/vaporintrusion/vapor-intrusion screening level-
calculator using default assumptions.

- = cancer risk could not be calculated; toxicity values not established
jxg/m3 = micrograms per cubic meter
Hg/L = micrograms per liter

The above VISL evaluated the maximum concentrations in May 2023. Prior to annual sampling, there
was a seasonal trend at MM-03A in which concentrations were highest in December. With the start of
annual monitoring, the overall trend in MM-03A has been downward with a slight rise in April 2022.
Well MM-03A is located near the control building on the SCE&G property; therefore, this FYR also
evaluated the potential for vapor intrusion at the control building. As noted in the Site's 2009
Assessment of Vapor Intrusion report (Technical Memorandum #004), the control building is used to
house electrical equipment and is highly ventilated to maintain appropriate operating temperatures.
The building is not occupied on a full-time basis but is used intermittently to perform required
maintenance and monitoring tasks. Therefore, there is no complete vapor intrusion pathway in the
control building, despite the presence of volatile groundwater contamination near the building.

Soil PRG Toxicity Assessment

Soil PRGs were based on risk rather than chemical specific ARARs. To evaluate whether the risk-based
PRGs remain valid, the PRGs were compared to the EPA's RSLs for a composite worker. RSLs
incorporate current toxicity values and standard default exposure factors. As shown in Table 1-3, the
soil PRGs remain valid because they correspond to risk below or within EPA's carcinogenic risk range of
1 X 10"6 to 1 X 10 4 and below the target noncancer HQ of 1.

1-2

-------
Table 1-3: Review of Soil Cleanup Goals - Commercial

Soil PRG

ROD Cleanup
Goal

(rng/kg)

Composite Worker RSL5

Cancer Risk0

Noncancer Hazard Quotient
(HQ)C

1 x 10 6 Risk

HQ-1.0

Arsenic

7.6

480

2.5 x 10"6

0.02

Benzo(a)pyrene (EQ)

1.7

2.1

220

T 1

X
T 1

0.008

Notes:

a. Current EPA RSLs, dated November 2023, are available at http://www2.epa.gov/risk/risk-based-screening-table-

generic-tables (last accessed 1/9/2023).

b. The cancer risks were calculated using the following equation, based on the fact that RSLs are derived based on
1 x 10 6 risk: cancer risk = (cleanup goal cancer-based RSL) x 10 6.

c. The noncancer HQs were calculated using the following equation: HQ = cleanup goal -- noncancer-based RSL.

mg/kg = milligrams per kilogram

The 2019 FYR evaluated the need for soil institutional controls on properties other than the SCE&G
property and determined institutional controls on other site properties are not warranted. To
determine whether the PRGs used for soil remediation continue to be protective of residential use
(and therefore would not require institutional controls), a review of the soil cleanup goals was
conducted by comparing the PRGs to the EPA's current RSLs for a residential exposure scenario. As
shown in Table 1-4, the soil PRGs remain valid as they correspond to risk within the EPA's carcinogenic
risk range of 1 x 10~6 to 1 x 10~4 and below the target noncancer HQ of 1. Therefore, institutional
controls on other site properties are not warranted.

Soil PRG

ROD Cleanup
Goal

(rng/kg)

Resident - RSL3

Cancer Riskb

Noncancer Hazard Quotient
(HQ)C

1 x 10 6 Risk

HQ-1.0

Arsenic

7.6

0.68

1.1x10-5

0.02

Benzo(a)pyrene (EQ)

1.7

0.11

1.5 x 10-5

0.09

Notes:

a. Current EPA RSLs, dated November 2023, are available at http://www2.epa.gov/risk/risk-based-screening-table-

generic-tables (last accessed 1/9/2023).

b. The cancer risks were calculated using the following equation, based on the fact that RSLs are derived based on
1 x 10 6 risk: cancer risk = (cleanup goal cancer-based RSL) x 10 6.

c. The noncancer HQs were calculated using the following equation: HQ = cleanup goal noncancer-based RSL.
mg/kg = milligrams per kilogram

Sediment Cleanup Goal Review

The 2002 OU-2 ROD stated that the remedial goal for sediments was to address PAH-contaminated
sediments with ESGTU HQs that were greater than 1. The 2002 ROD used the equilibrium sediment
benchmarks from the EPA's 2000 guidance on Equilibrium Partitioning Sediment Guidelines for the
Protection of Benthic Organisms: PAH Mixtures (EPA Final Draft dated April 5, 2000). These values
were compared to the sediment benchmarks in the EPA's updated 2003 guidance; the values have not
changed since 2000 (Table 1-5).

1-3

-------
Table 1-5: Review of Sediment Cleanup Goals

PAH

Equilibrium Sediment
Benchmark in 2002 ROD3
(M-g/g)

Current Equilibrium Sediment
Benchmark15

(M-g/g)

Benchmark Change

2-Methylnaphthalene

447

447

None

Acenaphthene

491

491

None

Acenapbthylene

452

452

None

Anthracene

594

594

None

Benzo(a)anthracene

841

841

None

Benzo(a)pvrene

965

965

None

Benzo(b)fluoranthene

979

979

None

Benzo(e,h,i)perylene

1095

1095

None

Benzo(k)fluoranthene

981

981

None

Carbazole

349

349c

None

Chrysene

844

844

None

Dibenzo(a,h)anthracene

1123

1123

None

Fluoranthene

707

707

None

Fluorene

538

538

None

Indeno(l,2,3-cd)pyrene

1115

1115

None

Naphthalene

385

385

None

Phenanthrene

596

596

None

Pyrene

697

697

None

Notes:

a.	From Table 5-6 of 2002 ROD referred to as the critical concentration of PAH in sediment identified
in EPA 2000 guidance.

b.	Values from Procedures for the derivation of equilibrium partitioning sediment benchmarks (ESBs) for
the protection of benthic organisms: PAH mixtures. EPA-600-R-02-013. Office of Research and
Development, Washington, DC. 2003.

https://nepis.epa.gov/Exe/ZvNET.exe/30006DOD.TXT?ZvActionD=ZvDocument&Client=EPA&lndex=2000

+Thru+2005&Docs=&Querv=&Time=&EndTime=&SearchMethod=l&TocRestrict=n&Toc=&TocEntrv=&Q

Field=&QFieldYear=&QFieldMonth=&QFieldDav=&lntQFieldOp=0&ExtQFieldOp=0&XmlQuerv=&File=D%

3A%5Czvfiles%5Clndex%20Data%5C00thru05%5CTxt%5C00000006%5C30006DOD.txt&User=ANONYMO

US&Password=anonvmous&SortMethod=h%7C-





&MaximumDocuments=l&FuzzvDegree=0&lmageQualitv=r75g8/r75g8/xl50vl50gl6/i425&Displav=hpf

r&DefSeekPage=x&SearchBack=ZvActionL&Back=ZvActionS&BackDesc=Results%20page&MaximumPage

s=l&ZvEntrv=l&SeekPage=x&ZvPURL (last accessed 1/9/2024)

c. A value was not established so the lowest benchmark was selected.



(ig/g = microgram per gram







1-4

-------
APPENDIX J - SHALLOW GROUNDWATER DATA

J-l

-------
Table J-1: Shallow Groundwater Monitoring Locations

Wells

Location

Sentinel Wells



DW-04

South Carolina Ports Authority

LM-03A

Former Luden's Property

LM-10AR

Former Luden's Property

MW-07AR

National Park Service Property

MW -" 4

National Park Service Property

MW-33

National Park Service Property

Aqueous Plume Weils



LM-OIAR

Former Luden's Property

LM-02A

Former Luden's Property

MM-02 A

DESC Substation

MM-03 A

DESC Substation

MRVV-U I

National Park Service Property

MRW-02

National Park Service Property

MZ-02AR

DESC Substation

Note: Sentinel wells are sampled on a biennial basis and were not sampled in 2021 or 2023.

J-2

-------
Table J-2: Summary of Groundwater Analytical Parameters and Methods





REQUIRED





ANALYTICAL

DETECTION

CLEANUP

CONSTITUENT

METHOD

LIMIT (mg/L)

GOAL (mg/L)

Volatile Organic Compounds







Benzene

8260B

0.005

0 005

Ethyl benzene

8260B

0.005

0 7

Toluene

8280B

0.005

! 0

Xylenes, Total

8260B

0.005

_

PAH Constituents







Acenaphthene

8270D

0.01

_

Anthracene

8270D

0.01

_

Benzol a jpyrene

8270D

0.0002

0.0002

Carbazole

8270 D

0.005

0.005'''

Ghrysene

8270D

0.01

0.2

Fluorantfiene

8270D

0.01

-

Fluorene

827QD

0.01

_

Naphthalene

8270D

0.01



Phenanthrene

8270D

0.01

-

Pyrene

8270D

0.01

-

Phenolics







2,4-Dimethylphenol

8270D

0.01



Inorqanics







Cyanide

yo a

0 2



1.	Field measurements included pH, specific conductance, temperature, dissolved oxygen,
turbidity, and redox potential.

2.	Quality assurance/quality control (QA/QC) samples included one equipment blank, one trip
blank per sample delivery group (VOCs only), one blind field duplicate and one matrix spike
(MS)/matrix spike duplicate (MSD).

3.	(1) - Revised cleanup goal of 0.053 mg/L proposed (MTR letter dated May 15, 2002).

4.	(2) - Cleanup goal modification approved (SCDHEC letter dated May 23, 2002).

J-3

-------
Table J-3: Benzene Historical Analytical Results - Aqueous Plume Wells

Sample Date

Units

LM-01AR01

LM-02A

MM-02 A

MM-03 A

MRW-01

MRW-02

MZ-02AR

January 1994

MSt-

98

100

390

5.200

-

-

-

Sept/Oct 1997

pgt-

-

5 U

-

-

-

-

-

February 1998

Pg/L

—

—

-

-

—

—

—

April 1993

pg-i-

-

-

-

—

-

-

-

May 1998

pgi-

-

-

-

—

-

-

-

July 1998

Pgrt-

-

-

-

—

-

—

—

October 1998

pg'L

59

130 J

—

—

-

—

-

Nov/Dec 1998

pgt-

100

5 U

7

6.500

-

-

-

March 1999

pg/L

—

—

—

—

—

—

—

June 1999

pg'L

—



-

—

—

-

—

Aug/Sept 1999

pg'L

-

-

-

—

-

-

-

July 2000

pgfl-

-

0.8 J

120

9.000

300

5U«

—

December 2000

pgi-

190

22

8

4.200

220

SU

4.200/3,700

March 2001

pgi-

150

SU

24

1.BOO

220

SU

—

June 2001

pgt

-

5U/5U

13

7.900

-

SU

4,000

September 2001

pg/L

54

34

10

3,700/3,800

—

SU

3,000

December 2001

Pg'L

7

5 U

5 U

1,900

-

5 U

2.DOO/1.BOO

March 2002

pgi-

7

5 Li

8

1.160/1.170

-

SU

3.770

June 2002

pgt-

7

5 (J

10

8,310

1,050

7

3.840/3,770

September 2002

pgt-

17

5 U

11

1.200

1.300

5 U

1.000

December 2002

WjA-

99

5 U

20

1,900

310

5 U

200

March 2003

pgfl-

170

5 U

18

160

460

SU

680

June 2003

pgJL

46

5 U

10

270

700

5 U

150

September 2003

pg/L

35

5 U

25

1,100

1,500

8.2

33

December 2003

rafl-

5 U

14

8.4

6,900

260

SU

440

March 2004



180

5 U

15

680

440

s u"

320

June 2004

ugA.

5 U

5 U

-

-

860

5 U

—

September 2004

pgfl-

5 U

5 U

11

180

1.000

5.5

13

December 2004

pg'L

5 U

5 U

-

—

360 J

SU

-

March 2005

pg/L

21

SU

14

1,100

460

SU

220

June 2005

pg/L

5 U

14

—



650

SU

—

September 2005

pgfl-

5 U

5 U

7.3

7

1,100

7

31

December 2005

pg/L

5 U

5 U

-

-

290

5 U

-

March 2006

pg'L

5 U

39

11

220

460

SU

71

June 2006

pg'L

5U

5U

-

-

510

5 U

-

September 2006

ng/L

5 U

SU

12

380

750 J

SU

76

December 2006

pg/L

5 U

SU

-

-

360

SU

-

March 2007



5 U

SU

24

640

220

5 U

400

June 2007

pgi-

-

-

-

—

—

-

-

September 2007

pgfl-

-

-

-

—

-

-

-

Deoember 2007

Pg/L

12

5 (J

12

3,600

75

SU

90

September 2008

pgt

96

5 U

10

320

300

SU

23

June 2009

pgi

50

5 U

9.8

5 U

600

5 U

450

March 2010

pgi-

120

9.6

38

160

370

5 U

280

December 2010

pg«-

5 U

5 U

15

7.300

300/300

SU

64

September 2011

pgfl-

200

SU

19

4.100

590/510

5 U

220

June 2012

pgA-

8.8

SU

17

150

420/430

5U

14

March 2013

PS^L

5 U

SU

14

650

130/110

SU

160

December 2013

PO'L

31

SU

14

4,200

340/340

5 U

65

September 2014

pg/L

5 U

SU

6

62

820/830

SU

100

June 2015

WL

151

SU

11

151

574/54 9

SU

e

March 2016

pgl-

51

5 U

5 U

5 U

291/266

SU

25

Deoember 2016

pg/L

134/157

5 U

s u

3440

263

SU

SU

September 2017

PB/L

88 J/55 J

5 UJ

s u

334

611

5 U

6.5

June 2018

pg/t

80.8 f 79.9

5 IJ

6.3

61

258

SU

194

April 2019

pg/L

64.8 / *

SU

e

4,270

168

5 U

SU

April 2020

pgfl-

89.4/ 101

5 U

12.7

180

121

SU

"313

April 2021

pg/L

155 ' 154

5 U

5.4

177

295

5 U

5 U

April 2022

pgfl-

55.7/54.4

SU

5 U

1,080

220

5 U

19.7

May 2023

pg/L

6.0/5.7

5 U

5

139

77.3

SU

5 U

Notes:

L Replacement Well.

2.	Sample collected August 2000,

3.	U - Indicates that the constituent was not detected at the reporting limit.

4.	J - Indicates an estimated value. The constituent was identified between the reporting limit and method detection
limit, or the result was qualified based on the data evaluation.

5.	UJ - Indicates that the constituent was not detected above the reporting limit and the result was qualified as
estimated during data evaluation.

J-4

-------
Table J-4: Naphthalene Historical Analytical Results - Aqueous Plume Wells

Sampie Date

Units

IM-01AR "

LM-02A

MM-02A

MM-03A

MRW-01

MRW-02

MZ-32AR'"'

January 1994

f^L

700 J

1,300

17

5,£00

-

-

-

Sept/Od 1907



-

29

-

-

-

-

-

February 1996

P0L

—

—

-

—

-

-

-

Apnl T9&B

wt

-

-

-

-

-

-

-

May 1998



-

-

-

-

—

-

-

Jtiyl9&8



-

-

-

-

-

-

-

October 1998



52

30 J

—

—

—

—

—

^JovOec 1998

t»9/L

ISO

io u

10 u

5,000

-

-

-

March "999



-

—

—

-

—

-

IT

June 1999

pg/L

—

-



—

—

-

-

AugfSept 1999

pjjfL

-

-

-

-

-

-

-

Jiiy2900

-O'L

-

3 J

78

3,900

530

sir'

-

December 2000



1,300

io u

io u

3,100

17

10 u

iou/iou

Maich 2001

W'-

620

10 u

10 UJ

1,400 J

28

10 u

-

June 2001

WfL

—

io urio u

io u

3,200

—

10 u

10 UK

September 2001



310

26

10 u

JiJUU JM CJW) J

-

10 u

810

December 2001

tifl/L

110J

10 UU

10 u

3,000

—

10 u

170 J/10 UJ

March 2002

WfL

66

10 u

10 u

840 J/660 J

—

10 u

710

June 2002

(igfL

37

10 u

10 u

2,000

940

10 u

aid J/1200 j

September 2002

vgtL

11

10 u

10 u

400

1,900

10 u

59

December 2002

WTL

78

10 UJ

10 u

2,200

160 J

10 UJ

10U

Man* 2003



2,500 J

10 u

10 u

10 u

S3

10 u

IfiU

June 2003



10U

10 u

10 u

53

770

10 u

10U

September 2003



10 u

10 u

10 u

1,400

3,600

10 u

10U

December 20QCJ



10U

23

10 u

2.600

10 u

10 u

10U

March'2004"

vqfi

260

10 u

10 u

66

910

10 u

ibu

June 2004

ItfL

10 u

10 u

-

-

2,500

io u

-

September 2CXM

jig/L

10 u

10 u

10 u

10 U

1,800

12

10U

Itecember 2004

PtfL

10U

iou

-

-

10 u

11

-

March 2005

M)N-

32

10 u

io u

370

1,900 J

12

1QU

June 2005

W-

10U

10 u

—

—

1,000

10 u

—

September 2035

MgC

10U

10 u

10 u

10 u

6,400

18

1QU

December 2005



10 u

10 u

-

-

34

io u

-

March 2006

itgfL

10 u

64

fiA®

10 u

440 J

10 u

¦ 0 u

June 2006

I^L

10 u

10 u

-

-

770 J

10 u

-

September 2006



10 u

10 U

10 u

10 u

2,700

10 u

10U

December 2006

MBfL

10 u

10 u

-

-

280 J

10 u

-

March 2007

W-

10 u

10 u

10 u

190 J

10 u

10 u

10U

bune 200?



—

—

—

—

—

-

—

September 2007

pgA.

-

-

-

-

—

-

-

December 2007

ug*.

44

10 u

10 u

1,700

21

10 u

10U

September 2006

WTL

203

10U

ib u

17 J

^13X5

10 u

10 u

June 2009

Wt-

10 u

io y

10 u

10 u

10 u

10 u

34

March 2010

PtfL

120

"iS

iou

26

920

WD

?1

December 3010

S^L

10 u

10 u

10 u

4,400

710/730

10 u

13

Seplem ber 2011

ug'i-

390

io uj

10 u

2,900

3,100*3100

io u

7t

June 2012



26

25 U

10 u

10 u

330/350

10 u

10U

March 2013

MIL

10 D

10 u

10U

10 u

320/340

10 u

IOU

December 2013



44

10 u

10 u

3,200

ioiy« u

10 u

14 J

September 2014



10 u

ib u

10 u

10 u

1,0QOf920

10 u

' 0 U

June 2015



326

10 u

10 u

24

810/818

10 u

10 u

March 2016

-3'l.

86

10 u

10 u

10 u

199/122

50 L

10

December 2016

SJflfL

400*434

10 u

10 u

3190 J

220

io u

10 u

September 2017

|ig/L

355 J/282 J

11 UJ

io u

153

768

10 u

10 u

Jtne 2018

Wift-

405/354

10 u

10 u

'4

218

¦ J

10 u

Apni 2019

WL

2?6 1 290

10 u

10

6.130

10 U

3& 1

9.8 U

April 2020

\w-

209 1 190

9.6 U

9.7 U

71.5

«S2

12 u

9JU

Apr* 2021



247 i 237

9.9 U

9.6

2SJI

218

9 7 LI

9.7 "

Aprs 2022

\igft-

5.9 UJ / 213 J

10 u

10 u

991

98 U

10 u

9.8 U

May 2Q23

tMVL

12.6/ 13.5

10 u

0.7 U

9.7 U

390

9.7 U

9.7 U

Notes:

1.

2,

3,

4.

Replacement Well.

Sample collected August 2000.

U - Indicates that the constituent was not detected at the reporting limit.

J - Indicates an estimated value. The constituent was identified between the reporting limit and method detection
limit, or the result was qualified based on the data evaluation.

UJ - Indicates that the constituent was not detected above the reporting limit and the result was qualified as
estimated during data evaluation.

J-5

-------
SCSPA PROPERTY

SCSPA

ELECTRICAL,

SUBSTATION

CHARLOTTE STRl

CONTROL
BUILDING

APPROXIMATE LOCATION
OF RETAIL BUILOING

Dfiw-08
(4.13)



LUDEN'S MARINE

DRW 40
14.53)
DRW-3S
,I«.99) j

UWjVJ.
-U.09)-

MWH

-(23?)—

' ' HF RO

-DHW-48

. (2.90)

onw-50."
(2.8S)

(1.29)

LIBERTY 9BUARE

(i3b) |

GROUNDWATER FLOW

DIRECTION (COLOR BLUE IS SEGMENT

FOR HYDRAULIC

CONDUCTIVITY ESTIMATE).

DASHFD WHFRF INFFRRFD	

SOUTH CAROLINA
AQUARIUM

APPROX LOCATION OF
TOUR BOAT FACILITY

DOMINION ENERGY
SOUTH CAROLINA, INC.

GROUNDWATER SAMPLING LOCATIONS AND
GROUNDWATER ELEVATION CONTOURS FOR
MAY 23. 2023

CALHOUN PARK AREA SITE
CHARLESTON. SOUTH CAROLINA

FILE NAME SGWCONQ523

APEX COMPANIES, LLC

CHARLESTON
GATEWAY CENTER

CITY OF CHARLESTON PARKING GARAGE

LEGEND

SENTINEL WELL
GROUNDWATER SAMPLING
LOCATION

AQUEOUS PLUME WELL
GROUNDWATER SAMPLING
LOCATION

WELL OR PIEZOMETER
GROUNDWATER ELEVATION
(FEET. NAVD 88. REFERENCED TO MLSL)
GROUNDWATER ELEVATION
CONTOUR (FEET). DASHED
WHERE INFERRED

NOTES

1.	GROUNDWATER CONTOURS WERE GENERATED USING SURFER
VERSION 23 AND ADJUSTED WHERE APPROPRIATE (I E BOUNDARIES).

2.	AQUEOUS PLUME WELLS SAMPLED ANNUALLY STARTING IN
APRIL 2019

3.	SENTINEL WELLS SAMPLED BIENNIALLY STARTING IN SECOND
QUARTER 2020

4 THE GROUNDWATER ELEVATION AT A3-T3 APPEARS TO BE
ANOMALOUS AND WAS NOT USED IN COUNTOUR DEVELOPMENT

Figure J-1: Shallow Groundwater Sampling Locations

J-6

-------
Figure .1-2: Average Benzene and Naphthalene Concentrations with Time from Aqueous Plume Wells - LM-01AR, LM-02A, MM-02A,
MM-03A, MRW-01, MRW-02, & MZ-02AR

J-7

-------
Table J-5: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program)

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4'1 SQCE2 I

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M-03A UMf ITiKft? 5 .1 5 U ~TT S U tct 5 U TT 10 tl 10 u ra j ID Ll TTT 10 Ll TTT 10 Ll m li io j TTT ic u TTT io u Trcr 10 t 10 I 10 Ll 10 ll TTT 10 Ll TTT 10 Ll 13 U 10 U ID Ll 10 u TTT 10 u TTT ¦u s u JILLL 1 JUL ' -mr JUL IBM JUi io u ¦^TT - . .. !l - 10 Ll _L1_L -UHt in u ¦m T5TCT 5 0 — s u 5 U Ttr 10 u 10 U 10 u J io j fi j io ul Tuft >0 u Ifl ' 10 L 10 LJ 10 li "nnr H3 U "W LM-0V> t) J bjJ 10 U 10 u TTl OJ VpJ n; u K> J ia j ToTT khj iij j j i .i 4# — ... J1L _LL2 J _Li_ ..: - J.:— JU JUL JUi JJJL JUL JIUL _UL jjiji. io J i^nr- TT 5 U -7 S Ll —- S Ll 10 u v: i 10 u TTT 10 u ri -i i • j i Ll TTT 10 Ll TT 10 Ll it: 1; 10 J 10 u — 10 J TT 10 L 10 J "J !-¦ 10 u TT IO Ll TT 10 J TT io u TT- 10 Ll "n-7 TT •tl u j*-r* jji _5Ji -LSI _Lil JfiAL JJJi. i JJL1L ID LJ '2 1' ¦a U JJUI 1 JXUi I > U ,'D U '2 y JBJi. ¦a l' JJUJ. m- 5 J — 5 J — 4t 5 Ll Ttr ¦n 10 u ~mr 10 J ~iTT 10 Ll Trrr 10 J Ttr 10 u TTT 10 Ll nnr io i tit 10 Ll TBTT io u "TTT 10 J -nnr * ¦M ¦M ¦ _L_ JJd. ig y j : JJUL JUL JU _u_ JUL J JUL Ji __ J L JUL _0JL JUL JJUL JJLL «- ¦m 10 u 10 u T j JOLJ 10 u 10 J 10 L tO J 10 U 10 Ll TTTT 10 Ul TTu 10 Ll TTu IC 11 TTTT ¦M -Li _Ui _UL _L=. _UL 10 L1 JUL _LLJ JUL JUL JUL JUL JUL JUL 10 'J JUL JUL JUL JUL JUL JUL JJLLL M-O'iA 5 Ll TT 5 U TIT S J TlT 10 u "TTT 10 Ll 10 Ll 10 Ll TT 10 Ll 10 Ll 10 Ll -nnr 10 D til u TTT I* AM. _i_L Ju. . JLk -J-A- JUL JL. -l: c ' 1 ¦ JUi JUL JLL JUL TlW i j TT 5 Li TTT b Ll TT 5 Ll Tr- io y TTT 10 v TTTT 10 U 10 u rrr I'J Ll TTT 10 J TTiT u j Tr- io j TT ic j TTT 1U J ¦nnr 10 L TT to j nnr 10 Ll l< ll HI J TTT Ttr 10 J 10 u IC U Ttr io u TTT 22. JlL _Ui JJi JUL. JUL JUL JUL JUL JUI JUL JUL JO. JUL JUL. JUL JM io j Jik rnw LMiflA 5 .1 TT 5 U TT 5 Ll TT 5 Ll TTT IB y TTT 10 u TTT io t 1W io u TTT nnr 10 u TTT ID .1 -nnr 10 J TTT 10 D TT 10 J TTT 10 u TT to J TTT 10 u TTT ra J TT 10 li TT 1C l TTT M Ll TT lo J [ tHMZIZZ I 4# -UL 5 U -Mf S J ¦m JJA NA 9.3 L 95 U J4£L. m jia. Ji£L_ NA ¦#1 J1A_ NA 9 5 Ll JifiL. -Kfr 5 U S5 U J-10

-------
Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program)

Clean ud Goal



Bwni

5

Bhyl
700

Toluene
1000







Anth

ceriftj(d/n

Saizovalp

0.2

Seneoib)

2faftZD|gAi 3

£eruro{\)

Cafba£a.'e
5

Cfuysene

200

OtiNxrroteM

Rjorant.'ie*.'



r**ifl»xHl .*.3-od)

fJaplii'iaieiia

1500

R>en

Pyrene

TTST™

700

Cyatude
200

Wril



































































































IW



52 iX

1>K

1HCO

IfflB

36

24

36

23

17 J

28 J

10 J

59 U

V4C

3fl

SB U

66

64



5*56

1 W

44 J

Bar

4500

MM HA

1 1i'l?J199S

6M0

520





24

19

10

10 U

16 U

io y

10 u

10 U

72

ID U

1Q 'J

12

47

10 u

tdtiO



7 j

1000

140

m-03A

WIQQOOD

9000

720

1700

1360

59 J

10 J

21 J

100 u

1

100 u

100 u

100 u

120

100 u

100 u

16 J

65 J

100 u

3900

81 J

10 J

1100

20 U

MM&U

raMHfflCl

4X»

4 Fj

' ^ "

640

1® U

IPG U

IDQ U

100 u

1M u

1® u

IOC u

100 u

¦ i3£ '

1 GO U

ioqu

100 U

100 U

10a u

3100

¦ mil

100 U

230

IMG

MM-ttA

w

1<*X;

3M

240

410

12

10 U

10 U

10 u

10 L'

10 u

10 u

10 U

S2

10 u

10 u

10 U

21

10 u

14 00 J

24

10 U

180 J

990

WIM-03A

9/0200*

7900

550

1700

1300

36

10 u

10

10 u

10 U

10 u

10 u

10 u

73

10 u

10 u

10 u

45

10 u

320C

62

10 U

WOO

150

MM01A

v.-: '

370D

450

73D

11®

23

1 G

ia u

10 u

10 u

10 u

IB U

10 u

3S J

10 u

10 u

io u

9 j

10 u

2COQJ

58

10 U

m j

710

VIKWU



1ffl

1»

2»

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S7

10 u

n

10 u

10 li

10 J

10U

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ij

10 u

10 u

10 u

50

10 u

HOG

66

10 u

000

10 U

MM-03A



1160

191

72

249

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

36 J

10 u

10 u

10 u

19

10 u

840 J

23 J

10 u

180 J

4950 J

MM-fliA

6"6®Ca

8310

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966

861

46

16

lb

10 u

10 u

10 u

10 u

10 u

82

-0 u

10 u

12

55

-¦a u

2000

73

10 u

iOOO

49



*ii

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120



000

1C

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10 u

10 u

10 Li

10 u

10 u

10 U



10 u

10 U

10



10 LI

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10 LI

66

icon !

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19S0

150

450

470

15

10 u

21

12

!:

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10 u

10 u

55

10

10 LI

38

36

10 u

2200

il

29

440

1270

moA

raoasxa

160

33

5 U

27

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 U

10 U

10 u

10 U

10 u

10 U

10 u

2000 U

MM-ai*

«12r?Ytl



£lT

5 1/

29

1C U

10 u

19 U

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10 u

10 u

10 u

14

10 u

10-J

in u

11

ID LI

53

14

10 IJ

10 IJ

13 >0 J

MM-D3A



1100

150

98

310

19

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10 u

10 u

10 u

10 u

72

10 u

10 u

10 u

29

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1400

29

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120

200 U

MM-03A

12-ir^X'J

6900

4iO

480

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55

14

52

10 u

10 u

10 u

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2b0

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18

85

10 u



78

ii-

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12

71

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10 11

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10 i)



10 u

10 ij

10 II

13 11

10 u

Oft

13

10 u

16

74 iU

V1M-03A

yuaco*

180

5 U

5 U

36

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 L)

10 U

10 U

10 u

10 u

10 U

10 u

10 u

479

MM03A



1100

110

36

14*

10U

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IBTi

10 u

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10 u

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' 57

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370

11

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77

2CC00 U

UM-33A

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7



5 U

5 U

5 U

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5 J

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10

11

5

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7

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15

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6

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1000

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220

17

5 U

11

10 u

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10 u

10 u

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10 U

10 U

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10700

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380

15

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53

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10 u

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1$ u

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1CHJ

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38

10 u

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13

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190 J

10 u

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4190

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3600

290

240

570

20

10 u

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10 u

10 u

110

10 u

10 u

13

47

10 u

1700

27

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390

1000Q U

mm

rr-r:-

J 20

23

in



15 UJ

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530

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1190

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3200

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MM-03A

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5100



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10 u

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300 U

MM-D3A

HfMQBic

3440

696

420

1300

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39.1 J

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16 J

119 j

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3190 J

14 6 J

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369 J

1600

MM-UJA

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334

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153

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4270

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15.6 J

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156

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104

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41 J

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6130

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699

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4.9 U

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71 5

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177

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265

89 9

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17

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382

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991

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5100

mmwba

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139

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66.6

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9 / U

NA

1 ?

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NA

NA

49 U

9.7 U

NA

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9 7 U

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3100



















































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65

24

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31

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530

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law-Msu

220

38

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mothoi

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92

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770

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vnraea

1500

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100

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260

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140

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100C

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-------
Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program)

J-13

-------
Table J-5 Continued: Summary of Historical Shallow Groundwater Quality Data (wells and parameters in current sampling program)

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-------
Table J-6: Summary of Historical Shallow Groundwater Quality Data (other wells with historical data for current parameters)

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5 U

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NA

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AM-OSA

9,^1997

5 U

5 U

5 U

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10 U

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NA

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AM-OSA

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5 U

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NA

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NA

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AM-OSA

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NA

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AM-OSA



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5 U

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10 U

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AM 05A



5 U

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5 U

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AMOSA



5 U

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5 U

5 U

5 U

5 U

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AM-05A

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5 U

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AM-OSA

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5 U

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5 U

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10 U

10 U

10 u

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AM-OSA



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5 U

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10 u

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AM-OSA

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5 U

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10 u

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20 U

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200 UJ

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NA

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AMW03AR



5 U

s u

5 U

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10 U

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5 U

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10 u

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AMW-G3AR

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5 U

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AMW-03AR

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5 U

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5 U

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5 U

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10 u

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02 U

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NA

20 U

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5 U

5 U

5 U

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0 2 U

10 u

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10 u

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NA

200 UJ

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5 U

5 U

5 U

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10 u

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2 U

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NA

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110 J

500 U

500 U

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NA

NA

:m-osa

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12

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16

47

10 u

10 u

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10 U

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21

10 u

390

26

10 u

NA

NA

:m osa

&'1S/1997

5 U

5 U

5 U

5 U

30

10 u

10 u

10 U

10 U

10 u

10 u

10 U

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10 u

10 u

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16

10 u

200

20

10 u

NA

NA

:m-osa

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29

39

5 U

27

29

10 u

10 u

12

12

10 u

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18

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10 u

15

22

16

NA

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:M 06A

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49

10 u

10 u

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10 U

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10 u

10 U

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27

10 u

NA

NA

:M 06A

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45

85

5 U

120

23

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10 u

10 U

14

10 u

NA

NA

:M 05A

7,3' l»

5 U

5 U

S U

5 U

10 U

10 u

10 u

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10 U

10 u

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10 U

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10 u

10 U

10 U

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NA

NA

:m-osa

UlCSflW.

8

18

5 U

17

51

5 U

8

5 U

5 U

5 U

5 U

5 u



5 U

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6

30

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NA

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:m-05a

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20

41

5 U

44

97 U

97 U

100 u

T9 U

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19 U

19 U

19 U

49 U

97 U

29 U

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70

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53

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23

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10 u

10 U

10 u

10 U

TO U

10 U

10 U

10 u

10 U

10 U

10 U

10 U

10 U

10 U

10 U

10 U

NA

:m osa

6/7/1599

5

18

5 U

10

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

:m-05a

watis&s

48

5 U

97

3.7

70

5 U

8

06 J

5 U

5 U

5 U

5 U

19

06 J

5 U

6

36

5 U

350

47

6

NA

NA

:m-osa



54 J

96 J

5 UJ

72 J

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

:m-05a

snarraw

58

120

5 U

120

150

7

10

5 U

5 U

5 U

5 U

5 U

75

5 U

S U

11

79

5 U

1100

84

11

NA

NA



















































DRW-03

warn

5 U

5 U

5 U

5 U

10 u

10 U

10 u

10 U

2 U

10 u

10 U

10 U

10 U

10 U

10 u

10 U

10 U

10 U

10 u

10 U

5 U

NA

200 U

DRW-03



S U

5 U

5 U

5 U

10 u

10 u

10 u

TO U

02 U

10 U

10 U

10 U

10 U

10 u

10 u

10 U

10 u

10 U

10 u

10 u

10 U

NA

200 U

DRW-03

ictm?

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 U

02 U

10 U

10 U

10 U

10 U

10 u

10 u

10 U

10 u

10 U

10 u

10 u

10 u

NA

200 U

DRW-03

isitcaw

5 U

5 U

S U

5 U

10 u

10 u

10 u

10 U

10 U

10 u

10 U

10 U

10 U

10 u

10 u

10 U

10 u

10 U

10 u

10 u

10 u

ID U

200 U

3RW-03

SflOCOOfc

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 U

10 U

10 u

10 U

10 U

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

200 U

DRW-03



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

200 U

DRW-03

K.C01Q

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

200 U



















































LM-12A

K7«»1

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

.M-12A



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 UJ

LM-12A

SV13CBD1

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

5 U

LM-12A

12100)01

5 U

5 U

5 U

5 U

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

LM-12A

WWc

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

02 U

10 u

10 u

10 u

5 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

NA

20 U

LM-12A

3,-19,':'®;

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

02 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U

L m2A

3rtCHM

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

02 U

10 u

10 u

10 u

5 UR

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U

LM-1ZA

WK

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

2 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

5 U

NA

200 U

LM 12 A



5 U

5 U

s u

5 U

10 U

10 u

10 u

10 u

2 U

10 u

TO U

10 u

TO U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

NA

200 U

LM-12A

3C1CT07

5 U

5 U

s u

5 U

10 u

10 u

10 u

TO U

02 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U



















































.M-13A

isseooi

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

1Cf u

10 u

10 u

10 U

10 u

10 U

M-13A

afi9H»i

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

5 U

.M-13A

cnocDoi

5 U

5 U

5 U

5 U

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

.M-13A

3,-seccc

5 U

5 U

S U

5 U

10 u

10 u

10 u

10 u

0 2 U

10 u

10 u

10 u

5 U

10 u

10 u

10 u

10 U

10 u

10 U

10 u

10 u

NA

20 U

LM-13A

j.i&coo:!

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

02 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

NA

200 U

LM-V3A

3Me004

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

02 U

10 u

10 u

10 u

5 UR

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

NA

200 U

LM-13A

3iBCOC6

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

2 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

5 U

NA

200 U

LM-13A

,V1«

5 U

5 U

5 U

5.8

10 u

10 u

10 u

TO U

2 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U

LM-13A

]«ti/3ai>7

5 U

5 U

5 U

5 U

10 U

10 U

10 u

10 u

02 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U



















































J-15

-------
Table J-6: Summary of Historical Shallow Groundwater Quality Data (other wells with historical data for current parameters)

Cleanup Goal



3en?eie

s

E*yi
700

Totiera
1000

Xyfenes

Aoefiaphlhen«!

Arenaphlhyterie

Anil*

Seruopjtt

Eteff£Oia;p

0.2

nen/o 1,1998

7200

890

170C

1900

500 U

500 U

500 U

500 U

500 U

500 U

500 U

500 U

NA

500 U

500 U

500 U

500 U

500 U

16000

500 U

500 U

NA

NA

MM-OIA

12/4/1998

7800

800

2300

2200

110

41

10 U

2 U

0 36

2 U

2 U

2 U

280

98 U

0 29 U

98 U

86

2 U

340G

91

98 U

85

9C i



















































MM-05A

1/1 7/1994

1500

990 J

370 J

1100

370 J

140 J

210 J

180 J

1000 u

130 J

1000 U

1000 U

150 J

160 J

1000 U

410 J

290 J

1000 u

4900

970 J

480

180 J

650

MM-05A

11/17,1993

240D

900

250

1300

180

33

20

2 J

2 J

5 U

5 U

5 U

140

2 J

5 U

13

90

5 U

5900

100

12

270

140



















































MM-G6A

_ 1Q.TLHS8

12000

730

4300

2200

01

50 U

50 U

50 U

50 U

50 U

50 U

50 U

NA

50 U

50 U

50 U

94

50 U

770

140

50 U

NA

NA

MM-06A

12/21998

10000

550

3500

2200

100

10 U

10 U

2 U

27

2 U

2 U

2 U

180 E

10 U

02 U

26

10 U

2 U

54 OG

90

10 U

71

;•'< j

UM-06A

7X1 }j'2100(

1800

510

220

430

490

49 J

100 U

1CI0 U

03

100 u

100 U

100 u

610

100 U

100 U

47 J

100 UJ

100 U

24000 J

410

47 J

2000

1700

MM 06A

1-1B-«00

6100

470

520

900

170

100 u

100 U

100 U

100 u

100 u

100 U

100 u

270

1QG U

100 u

100 U

100 u

100 U

9300

120

100 u

3600

10 U



















































m ioa

"10/1999

2400

650

910

950

130

16

19

5 U

5 U

5 U

5 U

5 U

140

5 U

5 U

9

01

5 U

5700

83

7

610

90



















































MRW-03



4 J

0 8 J

2 U

5 U

38

7 J

10

10 U

0 2 U

10 U

10 U

10 u

10

to U

10 u

6 J

37

10 U

61

59

4 J

10 U

20 U

MRW 03

iart4CT«i

5 U

5 U

5 U

5 U

32

10 U

10 u

10 u

10 u

10 U

10 U

10 u

10 U

to u

to u

10 U

10 u

10 U

10 u

10 U

10 U

10 u

20

MRW-03

3£.3CTB1

5 U

S (J

5 U

£ U

IB

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

20

MRW-03

tsccoi

5 U

5 U

5 U

5 U

10 U

10 u

10 u

10 u

10 U

10 U

10 U

10 u

10 U

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

It UJ

MRW-03



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

5 U

MRW-03

'Ml

5 U

S U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

If JJ

MRW-03

^CtlfC

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

5 U

10 u

to u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

20 J

MRW-03



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

?<: in

MRW-C3

s,io.*--oo:-

S U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 U

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

20 UJ

MRW-03

_ larjCOOI

5 U

5 U

5 U

5 U

10 UJ

10 UJ

10 Ul

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

188 J

MRW-03

3/1*2003

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 U

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 u

200 U

MRW-03

ftioeoK

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 U

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 u

10 u

200 U

MRW-03

fltlCKW;

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW-03

EW

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 J

10 u

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

j:.!' ..

MRW-03

MKOW

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW03

W.flSM

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

to u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW-03



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW 03

mSCTW

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW 03

W905

S U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW G3



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW-03

artscwe

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

to u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW03

anrsce

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

to u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

2011 U

MRW 03

3,"1C067

5 U

5 U

5 U

5 U

10 U

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

to u

10 u

200 U



















































MRW-06

m&am

28

20

5 U

38

41

7 J

7 J

10 u

0 2 U

10 u

10 U

10 u

18

10 u

10 u

6 J

31

10 u

200

40

5 J

2 J

130

WRW-06

rjrt+coiso

5 U

5 U

s u

5 U

51

10 u

10 u

10 u

10 u

10 u

10 U

10 u

16

10 u

to u

10 u

14

10 u

10 u

56

10 u

10 u

20

MRW-06

3i23V20Cl

5 U

5 U

5 U

5 U

30

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

TO u

10 u

10 u

10 u

23

10 u

10 u

20

MRW-06

feW?C01

5 U

5 U

5 U

5 U

34

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

MRW-06

wftctwi

5 U

5 U

5 U

5 U

17

10 u

10 u

10 u

to u

10 u

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

50

MRW-06

«*esoi

5 U

5 U

5 U

5 U

25

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

1( lid

MRW-06

WW

5 U

5 U

5 U

5 U

11

10 u

10 u

10 u

to u

10 u

10 U

10 u

5 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

20 U

MRW-06

esrm,-

5 U

5 U

5 U

5 U

39

10 u

10 u

10 u

10 u

10 u

10 U

10 u

5 U

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

20 UJ

MRW 06

WUSM

5 U

5 U

5 U

5 U

17

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 U

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

:: UJ

MRW 06



5 U

5 U

5 U

5 U

18 J

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

to UJ

to UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

23 J

MRW 06

jjiataci

5 U

5 U

5 U

5 U

46

10 u

10 U

10 u

10 u

10 u

10 u

10 u

10 U

10 U

to u

10 U

10 U

10 U

10 u

10 u

10 U

10 u

200 U

MRW-Ofi

6,'lOCJGi

5 U

5 IJ

5 U

5 U

10 U

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

200 u

MRW-06

WlClflflfcl

5 U

5 U

5 U

5 U

13

10 u

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 u

10 U

10 u

10 u

10 U

10 u

10 u

10 u

10 u

200 U

MRW-06

C.VSSJ

5 U

5 U

5 U

5 U

12 J

10 UJ

10 uu

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

10 UJ

200 U

MRW-06

jfaccw

5 U

5 U

5 U

5 U

21

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 U

10 u

10 u

10 U

10 u

10 U

10 u

10 u

.

MRW 06

e,7.«K>!

5 U

5 U

5 U

5 U

23

10 u

10 u

10 u

to u

10 U

10 u

10 u

10 u

10 U

to U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW 06

smcnw

5 U

5 U

5 U

5 U

10 U

10 u

10 u

10 u

to u

10 U

10 u

10 u

10 u

to U

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW 06

rcaow

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

to u

10 U

10 u

10 u

10 u

to u

to u

10 u

10 u

to u

10 u

10 u

10 u

10 u

200 U

MRW 06

J.SC0C6

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

to u

10 U

10 u

10 u

10 u

to U

to U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW-06



5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 U

to u

10 U

10 u

10 u

to u

10 u

to U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW-06

. 1,'ik-jiif.

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

to U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

200 U

MRW-06

SfKCOOS

5 ti

5 U

5 U

5 U

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 u

to U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

2QG U

MRW 06

3
-------
Table J-6: Summary of Historical Shallow Groundwater Quality Data (other wells with historical data for current parameters)

CJeonup God

ugA.

aem one

S

t*y1
TOO

Touerie
1000

Ayenes

Acenapnthefi«

A^enop*1hylefi>i

Anlfc

ntnsciofc

B«1ZO(ajp

0.2

tjertzo(o}

9wiiO(g.h.il

Sfiid)

Napnthobn*

1500

Ftler

rytan*

24-uiin

700

cyomde

290

Wei

Dote SamelM















































MW-12A



20

23

5 U

31 B

19

10 u

10 u

10 u

10 u

10 U

10 u

10 u

25

10 u

10 u

10 U

10 UJ

10 u

240

17

12

10 u

200 U

MW-12A

acacaos

5 U

93

5 U

7

25

10 u

10 u

10 u

10 u

10 U

10 u

10 u

14

10 u

io u

12

10

10 u

22

14

50 U

10 u

200 U

UW-12A



14

19

5 U

22 4

62

50 U

50 U

50 U

50 U

50 U

50 U

50 U

50 U

50 U

50 U

50 U

50 U

50 U

270

so u

27

50 U

200 U

MW 12A



22

35

5 U

3S

51

13

10 u

11

13

14

10 u

10 u

25

12

10 u

21

27

io u

21

53

12

10 u

200 U

UW-1ZA

I2/11C007

93

72

6.2

104

S3

10 U

10 u

10 u

10 u

10 U

10 u

10 u

56 J

10 U

10 u

14

49

10 u

300

49



10 u

200 U



















































WW-13

7m,caw

3 J

27

3 U

28

120

4 J

6 J

100 u

0.2 U

100 u

too u

too u

66 J

100 U

ioo u

100 U

45 J

ioo u

1200

34 J

100 u

ioo u

20 U

WV-13

larwzooo

5 U

10

S U

8

140 J

10 U

10 u

10 u

to u

10 u

10 u

10 u

140 J

10 u

10 u

10 U

75 J

10 u

790 J

66 J

10 U

10 u

10 u

vlW-13

3fi2J2001

5 u

12

S U

10

220

10 U

10 U

io u

io u

10 u

10 u

10 u

200

10 u

10 u

to u

S3

io u

290

57

10 u

10 u

to u

MM 3

6«C0O1

5 U

12

5 U

12

170

10 U

10 U

10 u

10 u

10 u

10 u

10 u

250

10 u

10 u

15

140

10 u

180

170

10 u

10 I)

10 u

MV-13

SVW'IW

5 U

5 U

5 U

5 U

10 U

10 u

10 U

10 u

to u

10 u

10 u

10 u

10 u

io u

10 u

10 u

10 U

10 u

to u

10 u

io u

10 u

to u

WW-13

IZftlEOOl

5 U

5 U

5 U

5 U

65

10 u

10 U

10 u

10 u

10 u

10 u

10 u

12

to u

10 u

10 U

2fi

10 u

69

17

10 u

10 u

10 u

vtW-13

3AGD01

5 U

5 U

5 U

5 U

10 U

10 u

10 U

10 u

02 U

10 u

10 u

10 u

5 U

10 u

10 u

10 u

10 U

10 u

10 U

10 u

10 u

NA

20 U

MW-13

anaeooj

5 U

5 U

5 U

5 U

10 U

10 u

10 u

10 u

02 U

10 u

10 u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 u

10 U

10 u

NA

200 U

WW-13

Ktiniw

5 U

5 U

5 U

5 U

11

10 u

10 u

10 U

02 U

10 u

10 u

10 u

5 UR

to u

10 u

10 U

10 u

10 u

to u

10 u

10 u

NA

200 UJ

MW13

W-TO5.

5 U

5 U

S U

5 U

25

10 u

10 u

10 u

2 U

io u

10 u

10 u

10 U

10 u

io u

10 U

10 u

10 u

10 u

10 u

5 U

NA

200 U

MM3

1!5COO€,

5 U

5 U

5 U

5 U

14

10 u

10 u

10 u

2 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

to u

10 U

10 U

NA

200 U

MW-13



s u

5 U

S U

5U

25

io u

10 u

io u

02 U

io u

10 u

10 u

10 U

10 u

io u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U



















































rw-ra

tlKSn5B7

5 U

5 U

S U

5 U

7i

2 u

0 77

0.1

0027

004

0 05 U

002 U

36

029

0.16

14

26

0.05 u

35

55

1 3

NA

NA

rw-02



5 U

5 U

5 U

5 U

98 U

98 U

10 u

2 U

03 U

2 U

2 U

2 U

49 U

98 U

03 U

93 U

93 U

2 U

93 U

98 U

98 U

98 U

20 U

rw-02

7rtaa>oo

5 U

5 U

5 J

5 U

4 J

io u

0 8 J

10 u

0.2 U

10 u

10 u

10 u

10 u

10 U

io u

1 J

2 J

10 u

to u

4 J

0 7 J

10 U

20 U

rw-02

ISI+CWO

s u

5 U

5 U

S U

10 U

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 U

10 u

10 u

10 U

10 u

to u

10 U

10 U

10 U

to U

rw-02

3C2SKW1

5 U

5 U

S U

5 U

10 u

io u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 UJ

io u

10 U

10 UJ

to U

rw-02

srtCiiot

5 U

5 U

5 U

5 U

io u

io u

10 u

10 u

10 u

10 u

10 u

io u

10 u

io u

10 u

10 u

io u

io u

10 U

10 u

10 U

10 u

10 U

rw-02

M&Wlttl

5 U

5 U

5 U

5 U

io u

10 u

10 u

10 u

to u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

io u

10 u

to u

10 u

10 u

10 u

5 U

rw-02

mcooi

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

to U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

to u

10 u

10 U

10 u

to UJ

rw-02

3BC0TC

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

0.2 U

io u

10 u

10 u

5 U

10 u

io u

10 u

10 u

10 u

to U

10 u

10 u

NA

20 U

TWH32

jnawm

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

02 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U

rw-02

WfiW

5 U

5 U

5 U

5 U

10 u

10 u

10 u

10 u

0 2 U

10 u

10 u

10 u

5 UR

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

NA

200 U

rw-02

viEm

5 U

5 U

5 U

S U

10 u

10 u

10 u

10 u

2 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

to u

10 u

5 U

NA

200 U

rw-02

uijswk

SO UJ

50 U.

50 UJ

50 UJ

10 u

10 u

10 u

10 u

2 U

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 u

10 U

NA

200 U

rw-02

3C1.uaranlhene
D»benzo(a.h) -DA>enza(a,h)antliracefie
lndeno( 1, 2 3-cd) lndeno( 1,2.3-cd)pyrene
Phen Pfienanthrene
2 4- Qfn - 2 4-Dimethylphenol

J-17

-------
mngre—i	1	r	

12/00	27 0&OS	5 U 06/09 5 U 9/14 5U

03/01	6 09/04	SU 03/10 SU »15 5U

06/01	5 U 12/04	SU 12/10 SU 3/16 5U

09/01	8 I 03/0S	SU |09/I1 SU 12/16 SU

12/01	5U1 06/05	SU 06/12 5U 09/17 5 UJ

03/02	SU | 0905	5 U I 03/13 5u| 06/18 5U

06/02	SU 1 12/05	SU ' 12/13 5 U 04/20 5U

09/02	5 U I 03/06	S U	| 04/22 5 U

12/02	SU 1 06(06	5 U
fli/M—)S-W-f>08/CH

06/03	5U I 12/06	SU pRWMl

09(03	5 U | 0M7	5U

12/03	5_U 1 12(07	5 U

LM52A T	I

01 S4 160 j 03/03	SU |

10/97 SUl 03/03	5 U 101(17

10/Se 130 , 09/03	SU , 12/07

12/98 S UI 12/03	14 | 03/07

07,00 ( J . 03/04	S U . 06/08

12/00 22 1 06/04	5 U | 03/10

03/01 5 U, 09/04	5U . 12/10

06/01 SU| 12/04	5U I 09/11

09/01 34 03/05	S U 06/12

_ SZfll	*5Jul| ,,-14^,03/13,

QW-04 |

11/98 SU ,03/07	SU

8W90- SU|l2/07	5 U

12/00 su oaoa	su

03/01 5 U 106/09	5 U

06/01 5 U 03/10	SU

09/01 5U 12/10	SU

12/01 5 U 09/11	SU

03/02 5 U 06/12	SU

03/03 5 U 03/13	SU

MRW-06

07/00 " 28

12AO lo 03/07 5 U

MW-12A

01/94

03/87

DRW 03
03/05 to 03/10
5 U

TTTiT

03/01
06/02

06/02 5U 12/05 SU 09/14 5U
00/02 5 U1 03/06 14 1 05/15 5 1

-4a»a	S-U- I -06^«——S4i

	,, """V CII -1?/l»t *'1

'|12®B 5U I 09/17 5 UJ
1	1 06/18 5U

j I	04/19 5 U

04/20 5 U
•	04/21 5 U

04/22 5 U

1|00 5!W E9/Q5 5 U "J5S53 SU

03(01 150 1)2/05 5 U 	

OJ/01 54 33,06 5 U
iSol 7 |06/OS 5 U
*06/02 7 'bsfflc 4IL
06/02 7 Il2ffl6 SU
09/02 ! 7 'oil07 SU,

12/02 99 j ','07 | 12
03(03 170 'fciiWlJ 96 O
06/CI -st 106/09 ! ¦ 'J D
j3a'03.

12/03 S UI12/10 5U

-j 1W1 I no/11 200
0SW. jjjp——r-
0»04 5UI03/13 TC

03/06 5 U 05/15 5 U
03/07 5 U 03/16 5 U
-UW6-5-U
J 09/17 5 UJ

		[06/18 5 U

9	04/20 5U

J\ lo*aa su

bott

12/02
03/03
OB/03
DS/03
12/03J
03»-t

MM-03*

LM-13A

D3/01 to 03/07 5 U

ps/oi

12"01

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09(02

MRW-03

rero 4 j

12/00 to 03/07 SU

07/00 a.ooD

12/00 4.200
1,900

» (66(6^ j V.900
—' OW01 "H"'3.700
12/01 1.900

o,!rojv i.teo
f 06/02 > 9,310
I , 09103

| yygj 3 270

- - -i~~

TwSJ-Tio

12/98 7

qTTCIO	120

iwdo	8

03/01	2«

06/01	13

09/01	10

12701	5 L

&m-<—&

06/02 1 0
09/02 11

SaesZ^sS.

03/03 18

12/04
03/05
06(05
0905
12(06
03/06
06/06
08/06

0&01 lo Q3X3T 5 U

720Z
03(03
06/03
09/03
1203
03/04

LM-03A

LM-D1AR

01/94	10 U

11/98	5 U

07/00	5 U

12/00	5 U

tsmi— eu

06/01	>U

09/01	)U

12/01	iU

LM-OJA

JJL-U	

12/06 14

03/05
09/05

12/03 6.900

MRW-01

09/07	13
12/07 5 U

09/08	13
06/09 50

i 03/10	12
.. 12/10 5 U
09/11 5 U
06/12 5
03/13 5 U

12/13	SU
09/14 5U
05/15 fi U

. 03(16	S4*|	

12/16 5 U
09/17 5 U
06/1B 5U
04/20 SU

¦lot gZ~~	"513

MKW-02

3JE0X
0®03

12/03
03/04

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03/05

oaro

03/06
06/06
03/07
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09/08
06(09
03/10
12/10

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12/07
09/08
06/09
03/10
12/10
09/11
06/12
03/13
12/13
09/14
05/15
03/16
12/16
09/17

03/05 21

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09.02

12/02

03(03

06/03

09/03

12/03

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06AM

09/04

12/04

03/05

08/05

09(05

09/04
03/05
09/05
03/06
08/06
03/07
12/07
09/08
06/09
03/10
12/10
09/11
06/12
03/13

09/14
05/15

06/00	5U M27D5-

12/00	5 U 103(06

03/01	5 U I 06/06

08/01	S U | 08/06

09(01	5UI 12/06

.12/01	5 U j 03/07

(81/02	5 U 112/07

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09/02	5 U | 06(09

12/02	5 U ,01(10

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06/03	5 U 09/11

39/03	8 106/12

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03/04	5U

03/05	5U

03/06	5 U

03/07	5 U

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09/08	5 U

06/09	5 U

03/10	5 U

12/10	42

09/11	14

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12/98 5 U 103/07 SU
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03/16
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04/19
04/20
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04/20	180

04/21	177

04/22	1,080

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09/17

06/18
04/19
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04/22 5U

DOMINION ENERGY
SOUTH CAROLINA, INC

£555525
01/94 10 u
03/97 to 0307

07(00 3 J
12/00 to 03/07 SU

0 BENZENE IS GENERALLY FOUND ABOVE
THE REPORTING UMIT OF 5 UGA

^ BOIZENE IS PREDOMINANTLY TO ALWAYS BELOW
THE REPORTING UMT OF 5 UG/L

0	INDICATES BENZENE WAS INI 1IALLY FOUND ABOVE S UG/L
mo WITH TIME IS PREDOMINANTLY BELOW 5 UGA

1	I MAY 2023 ANALYTICAL RESULTS

NOTE:

1)	RESULTS IN UGA

2)	FORMERLY SAMPLED WELLS SHOW RANGE OF
TIME PERIOD SAMPLED AND RESULTS. WHEN
RESULTS DIFFERED FROM THAN CONSISTENTLY
OBSERVED (e.g. 5 U). THAT RESULT IS SHOWN.

3)	WW-12A WAS FORMERLY SAMPLED AND SINCE
RESULTS VARIED OVER TIME. THE HISTORICAL
RESULTS ARE SHOWN.

HISTORICAL BENZENE
GROUNDWATER ANALYTICAL RESULTS
THROUGH MAY 2023 EVENT

CALHOUN PARK AREA SITE
CHARLESTON, SOUTH CAROLINA

DATE: 9/20/23

FILEMAME; CPA092

FORMERLY SAMPLED WELL

GRAPHIC SCALE

APEX COMPANIES, LLC

Figure J-3: Historical Benzene Groundwater Analytical Results Through May 2023

J-18

-------
LM-10AR

1100 ,06/04 10 I 06/09	10 U 09/14	10 U

10 UJ | 09/04 10 U 103/10	10 U 05/15	10 U

20 ,12/04 10 U 112/10	10U 03/16	tO U

03/05 10 U 109/11	10 UJ 12/16	33

06/05 10 U 106/12	25 U 09/17	10 UJ

03/13	10 U 06/18	10 U

12/13	40 04/20	9.7 U

I 04/22	9.9 U

Figure J-4: Historical Naphthalene Groundwater Analytical Results Through May 2023

J-19

-------
Table J-7: Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL (December 2000 to May 2023)

Sampling Event

A3-T3

CM-03A

LM-01AR

LM-10AR

MM-03A

MM-11A

MRW-01

MRW-05

MW-12A

MZ-06M

MZ-55A

ORC-7

PM-02A

Dec-00

NP(1)

NP

NP

NP

TRACE

0 30

NP

TRACE

0 06

0 14

TRACE

NP

Installed
10/21/01

Mar-01

NP

0.40

NP

NP

TRACE

0 30

NP

NP

TRACE

NP

TRACE

NP

Jun-01

NP

0.10

NP

NP

TRACE

0.40

NP

NP

—

0.30

TRACE

NP

Sep-01

NP

0 12

TRACE

NP

TRACE

0 63

NP

TRACE

-

1.25

0 05

NP

Dec-01

NM(J>

—

NM

0.2

—

—

NM

NM

—

—

—

NM

NM

Mar-02

NM

1.09

NM

TRACE

TRACE

1.54

NM

TRACE

—

1.40

TRACE

NM

NM

Apr-02

NP

-

-

-

-

-

-

—

—

-

-

-

-

May-02

NP

—

—

—

—

—

—

—

—

—

—

—

—

Jun-02

NP

0.70

NP

NM

0.10

0.90

NP

TRACE

—

0.52

0.45

NM

NM

Jul-02

NP

—

—

—

—

—

—

—

—

—

—

—

—

Aug-02

NP

—

—

—

—

—

—

—

—

—

—

—

—

Sep-02

NP

0.30

NP

0.17

TRACE

0.23

NP

TRACE

TRACE

0.10

0.53

NP

TRACE

Oct-02

NP

—

—

—

—

—

—

—

—

—

—

—

—

Nov-02

NP

—

NP

0 10

—

—

NP

TRACE

—

—

—

—

—

Dec-02

NP

0.75

NM

NM

TRACE

1.40

NM

NM

NM

0.40

0.80

NM

NM

Jan-03

_<3)

-

TRACE

TRACE

-

-

TRACE

TRACE

-

-

-

-

-

Mar-03

NP

0 75

TRACE

TRACE

! TRACE

1 03

! TRACE

TRACE

0.25

TRACE

0 50

NP

TRACE

Apr-03

—

—

TRACE

TRACE

—

—

TRACE

TRACE

—

—

—

—

NM

Jun-03

NP

2 00

NP

0 10

TRACE

0 97

TRACE

TRACE

0.25

0.55

0 15

NP

NM

Jul-03

—

—

NP

0 10

—

—

NP

TRACE

—

—

—

—

NM

Sep-03

NP

0.63

NP

0.10

TRACE

070

TRACE

TRACE

040

0.85

0.88

NP

NP

Oct-03

-

—

NP

0 30

—

-

NP

TRACE

- j

—

—

—

NM

Jan-04

—

—

NP

NP

—

—

NP

TRACE

—

—

—

—

—

Mar-04

NP

0.58

NP

TRACE

0.01

1.50

NP

TRACE

0.80

1.42

TRACE

NP

NM

Apr-04

-

-

NP

NP

-

-

TRACE

TRACE

-

-

-

-

-

Jul-04

—

—

NP

TRACE

—

—

NP

TRACE

—

—

—

—

—

Sep-04

NP

0 70

NP

TRACE

TRACE

0 98

NP

TRACE

0 50

060

¦ TRACE

NP

NM

Oct-04

-

-

NP

0 30

-

—

NP

TRACE

-

-

-

-

NM

Jan-05

—

—

NP

0 52

—

—

NP

NP

—

—

—

-

—

Mar-05

0.73

0.55

NP

0.45

TRACE

060

NP

0.14

0 89

0.54

0.91

NP

NM

Apr-05

-

-

NP

0.52

-

-

NP

NP

-

-

-

-

NM

Jul-05

—

—

NP

0 52

—

—

NP

TRACE

—

—

—

—

—

Sep-05

0.10

1 12

NP

0.52

TRACE

NM

NP

TRACE

TRACE

1.43

0.92

NP

NM

Oct-05

-

—

NP

0.52

—

—

NP

0.20

—

—

—

—

—

Jan-06

—

—

NP

0 60

—

—

NP

NP

—

—

—

—

NM

Mar-06

0.01

1.08

NP

0.60

TRACE

0 11

NP

NP

0.38

0.58

0.40

NP

NM

Apr-06

-

-

NP

0.53

—

—

TRACE

NP

-

-

-

-

-

Jul-06

—

—

NP

0.73

—

—

TRACE

TRACE

—

—

—

—

—

Sep-06

TRACE

0.65

NP

0.73

TRACE

0.30

TRACE

TRACE

0.30

0.95

0.75

NP

NM

Oct-06

—

—

TRACE

0.50

—

—

NP

TRACE

—

—

—

—

—

Jan-07

—

—

NP

—

—

—

NP

TRACE

—

—

—

—

—

Mar-07

TRACE

0.51

NP

0.50

TRACE

0.60

NP

TRACE

0.40

1.61

0.51

NP

NM

Apr-07

—

—

NP

0.20

—

-

NP

NP

-

—

—

—

—

Jul-07

—

—

—

—

—

—

—

TRACE

—

—

—

—

—

Oct-07

—

—

—

—

—

—

—

TRACE

—

—

—

—

—

Dec-07

TRACE

0.79

NM

TRACE

I TRACE

0.63

—

NP

1 86

0.83

TRACE

TRACE

NM

Jan-08

—

—

—

_

—

—

—

TRACE

—

—

—

—

—

Apr-08

—

—

—

—

—

—

—

0.03

—

—

—

—

—

Jul-08

-

-

-

-

-

-

-

NP

-

-

-

-

-

Sep-08

TRACE

0.77

NP

0 12

NP

0 65

NP

NP

0.24

0.28

0 16

TRACE

NP

Oct-08

—

—

—

—

—

—

—

NP

—

—

—

—

—

Jan-09

—

—

-

—

—

—

—

TRACE

—

—

—

—

—

Apr-09

—

—

—

TRACE

—

—

—

0 02

—

—

—

—

—

Jun-09

0.07

0.44

NP

NP

TRACE

0.62

NP

TRACE

0.15

0.59

TRACE

TRACE

NM

Jul-09

-

—

—

—

-

-

—

TRACE

-

-

—

—

-

Oct-09

—

—

—

—

—

—

—

TRACE

—

—

—

—

—

Jan-10

—

—

—

—

—

—

—

NP

—

—

—

—

—

Mar-10

0 18

0.32

NP

—

TRACE

0.42

NP

NP

1 05

0.10

NP

0.10

NM

Apr-10

—

—

—

TRACE

—

—

—

TRACE

—

—

—

—

—

Jul-10

—

—

—

—

—

—

—

TRACE

—

—

—

—

—

Oct-10

—

-

-

-

—

—

—

NP

—

—

—

—

—

Dec-10

0.25

0.28

NP

-

TRACE

0.48

NP

NP

084

TRACE

0 18

TRACE

NM

J-20

-------
Table J-7 Continued: Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL (December 2000 to May 2023)

Sampling Event

A3-T3

CM-03A

LM-01AR

LM-10AR

MM-03A

MM-11A

MRW-01

MRW-05

MW-12A

MZ-06M

MZ-55A

ORC-7

PM-02A

Jan-11

—

—

—

—

—

—

—

NP

—

—

—

—

—

Apr-11

—

—

—

NP

—

—

—

NP

—

—

—

—

—

Sep-11

0.15

0.38

NP

—

TRACE

0.63

NP

NP

0.82

TRACE

0.66

TRACE

TRACE

Oct-11

—

~

—

—

—

—

--

NP

—

--

—

—

—

Jan-12

—

—

—

—

—

—

—

NP

—

—

—

—

—

Apr-12

—

—

—

TRACE

—

—

—

NP

—

—

—

—

—

Jun-12

0.37

TRACE

NP

—

TRACE

0.64

TRACE

NP

115

TRACE

0 83

0.18

TRACE

Jul-12

—

—

—

—

—

—

—

TRACE

—

—

—

—

—

Oct-12

—

—

—

—

—

—

—

NP

—

—

—

—

—

Jan-13

—

—

—

—

—

—

«

TRACE

—

--

--

--

—

Mar-13

0.03

2.25

NP

TRACE

TRACE

0.82

NP

TRACE

0.38

TRACE

0.43

TRACE

NP

Apr-13

—

—

—

—

—

—

—

NP

—

—

—

—

—

Jul-13

—

—

--

—

—

—

--

NP

~

—

—

—

—

Oct-13



—

—

—

—

—

—

NP

—

—

—

—

-

Dec-13

0.25

1.60

NP

—

TRACE

110

NP

NP

1 25

NP

1 62

TRACE

NP

Jan-14

! 0.22

—

—

—

—

—

—

NP

—

—

—

0.12

-

Apr-14

—



—

0.07

—

—

—

NP

—

—

—

TRACE

—

Jul 14

TRACE

—

—

—

—

—

—

TRACE

—

—

—

TRACE

—

Sep-14

TRACE

1 22

NP

~

TRACE

1.42

NP

NP

1.30

NP

1.40

TRACE

NM

Oct-14

0.20

—

—

—

—

—

—

NP

—

—

—

TRACE

—

Jan-15

—

—

—

—

—

—

—

NP

—

—

—

NP

—

Apr-15

—

—

—

0.15

—

—

—

NP

—

—

—

NP

—

May-15

TRACE

1.12

NP

—

0.02

1.05

NP

NP

0.42

TRACE

1.05

NP

TRACE

Jul-15

NM

—

—

—

—

—

—

NP

—

—

—

TRACE

—

Oct-15

—

—

—

—

—

—

—

TRACE

—

—

—

TRACE

-

Jan-16

: 0.24

--

—

—

—

—

~

TRACE

—

—

—

TRACE

—

Mar-16

0.24

0.85

NP

—

TRACE

1.20

NP

TRACE

0.60

0.60

1.20

TRACE

NP

Apr-16

0.22

—

—

0.80

—

—

—

NP

—

—

—

TRACE

—

Jun-16

0.10

—

—

—

—

—

—

TRACE

—

—

—

TRACE

—

Oct-16

TRACE

—

—

—

-

—

—

NP

~

—

—

NP

—

Dec-16

—

0.98

NP

0.80

TRACE

1 20

NP

—

0.70

TRACE

1.20

—

NP

Jan-17

0.30

0.80

—

~

—

1.10

~

TRACE

1.05

TRACE

1.20

TRACE

—

Feb-17

—

0.73

—

—

—

1.90

—

—

1.15

—

1.10

—

—

Mar-17

—

0.67

—

—

—

1.93



—

1.35

—

1.20

—

-

Apr-17

—

0.90

—

0.18

—

0.66

—

—

0.28

—

0.89

—

—

May-17

0.28

0.80

—

—

—

045

—

TRACE

0.70

TRACE

1.03

TRACE

—

Jun-17

—

0.95

—

—

—

1 50

—

—

0.75

—

1.00

—

—

Jul-17

—

0.45

—

—

—

1.55

—

—

0.70

—

1.00

—

—

Aug-17

0.32

0.75

—

—

—

2.35

—

NP

0.75

NP

0.94

TRACE

—

Sep-17

—

0.95

NP

0.18

0.21

1.20

NP

—

0.25

NP

0.77

—

TRACE

Oct-17

—

1.00

—

—

—

2.20

—

—

0.44

—

1.18

—

—

Nov-17

TRACE

1.22

—

-

—

1.03

—

NP

0.55

TRACE

1.00

0.2

—

Dec-17

-

0.80

-

-

~

0.80

-

-

0.55

»

1.15

-

—

Jan-18

TRACE

1.35

—

—

—

0.98

—

NP

0.84

TRACE

1.41

TRACE

—

Feb 18

—

0.95

—

-

—

1.30

—

—

0.85

-

0.80

—

-

Mar-18

—

0.78

—

—

~

1.68

—

—

0.38

—

0.54

~

—

Apr-18

0.20

0.83

~

~

—

1.90

—

NP

0.55

TRACE

0.70

TRACE

~

May-18

—

1.00

—

-



1.70

—

-

0.60

—

1.75



-

Jun-18

-

0.66

NP

TRACE

TRACE

0.75

NP

NP

0.37

-

0.74

TRACE

NM

Jul-18

TRACE

0.65

—

—

—

1.15

—

NP

0.35

TRACE

0.76

TRACE

-

Aug-18

—

0.62

—

—

—

1.41



—

0.74

—

0.89

__

-

Sep-18

I —

1.00

—

—

—

2.02

—

~

0.58

—

1.05

~

—

Oct-18

TRACE

0.93

—

—

—

1.68

—

NP

0.44

TRACE

1.18

TRACE

-

Nov-18

—

0.60

—

—

-

1.05

—

—

0.70



1.15

~

--

Dec-18

-

0.83

-

-

~

0.72

—

--

083

--

0.95

-

—

Jan-19

0.15

0.99

—

—

—

1.30

—

NP

0.85

TRACE

0.89

TRACE

—

Feb 19

—

0.78

—

--

—

0.85

—

—

0.45



1.10

—

—

Mar-19

—

080

—

—

—

1 00

—

—

033

—

070

—

—

Apr-19

025

0.63

NP

TRACE

TRACE

0.82

NP

NP

0.60

TRACE

1.05

TRACE

NM

Apr-20

TRACE

0.5

NP

NP

TRACE

1.78

NP

NP

0.20

TRACE

1.20

TRACE

—

Mar/Apr-21

0.31

1.00

NP

NP

TRACE

0.62

NP

NP

0.10

TRACE

1.20

NP

—

Mar/Apr-22

TRACE

0.60

NP

NP

NP

1.38

NP

NP

0.62

TRACE

1.10

TRACE

—

Mar/May/June-23

TRACE

0.75

NP

NP

TRACE

1.53

NP

NP

0.15

NP

1.65

TRACE

-

Notes:

(1)	NP - No Product

(2)	NM - Not measured due to access constraints

(3)	— Not measured during tNs event

J-21

-------
SOUTH GASOU** STATE
PORTS AUTHORITY (SCSPA) PROPERTY

(WTERIOOWM® S-fFT pa P WALL

SCSPA

ELECTRICAL
SUBSTATION

DRAINAGE, outfall

DRW-20

DRW-27

DRW-25 ^	ORW-'0 i

CONTROL BUILDING

DRW-28

, DRW-11

RESIDENTIAL

I FORMERI
I RETAIL
I gas I
I STATION,

f (APPROX. I
1 LOCATION),

ARTESIAN
W£LL

TWD-STOKY
WQ00\RES1D

DRW—13

HIGH
VOLTAGE

EBMW-03

ABOVE GROUND CABLE TRENCH

>RW—00

THREE STORY BRICK BUILDING

rDRW-11
DRW-1J

LUDEN'3 MARINE

EBMW-D5

DRW—23 DRW-21

] DRW—41

\ #

j	DRW-

[ DRW—36
0 DRW—37-

DRW—38

SINGLE—STOftY -j

snjcco J

EBMW—04

APPROXIMATE LOCATION
OF RETAIL BUILDING

BURIED SEA WALL

OISHE?. HAMFflCK
fie MYERS REALTY

UNOCIlOniOtiWD

CONCRETE
LOADING AREA

MW-12A

1 FORMER |
[AUTO BODY SrfOR
I (APPROX. LOCATION)

BUS LANE

MRW-02

AQUAR/OM WHARF ro.

SERVICE AREA

DRW- 50

DRW—48

MW-Q7AR

SOUTH CAROLINA
AQUARIUM

CITY OF CHARLESTON PARKING GARAGE

FORMER |
j RETAIL .
' GAS '
| STATION |
, (APPRCK. ,
J LOCATION)/

UBERTY SQUARE
(GRASS AND TREES AREA)

CHARLESTON
CAfLWAY CENTER

SEWER
VORTEX

INTERLOCKING SHEET PILE WALL (20* DEEP) APPfl0X- LOCATION OF 42" RCP STORM SEWER

APPROX. LOCATION OF
TOUR BOAT FACILITY

[APPROX. LOCATION OF 42" RCP CALHOUN STREET



DOMINION ENERGY
SOUTH CAROLINA, INC

0 SHALLOW PIEZOMETER

MONITOR WELL SHALLOW
jff DNAPL RECOVERY WELL

^ WELL THAT HAS EXHIBITED INTERMITTENT OR "TRACE"

AMOUNTS OF DNAPL - DECEMBER 2000 THROUGH PRESENT

SHALLOW GROUNDWATER MONITORING WELLS
WITH INTERMITTENT AND/OR "TRACE"
AMOUNTS OF DNAPL

CALHOUN PARK AREA SITE

FENCE JhE

fcPPfKWIMl.TE LDCAT1CW OF STORM SEWE3K

100

200 FEET

GRAPHIC SCALE

j:

CHARLESTON, SOUTH CAROUNA

DATE: 8/15/23

FILE NAME: CPA091

APEX COMPANIES, LLC

Figure J-5: Shallow Groundwater Monitoring Wells with Intermittent and/or Trace Amounts of DNAPL

J-22

-------
DOMINION ENERGY
SOUTH CAROLINA. INC

ILLUSTRATION OF BENZENE
CONCENTRATIONS

CALHOUN PARK AREA SITE
CHARLESTON, SOUTH CAROLINA

DATE: 9/11/2023	FILE NAME: BENZENE 0523

POST-IRA-April 2020

POST-IRA-April 2021

-FGFND

5-50 ug/L
50-500 ug/L
500-5,000 ug/L
> 5,000 ug/L

Note: Due to "numeric dispersion"
the boundary extent
shown may be overstated

APEX COMPANIES. LLC

POST - IRA - September 2014

POST - IRA - March 2010

POST - IRA - March 2004

POST - IRA-June 2018

START OF IRA - December 1998

POST - IRA - September 2017

POST-IRA-April 2022

Rl Event-January 1994

POST-IRA-May 2023

Figure J-6: Illustrations of Benzene Concentrations from January 1994 to May 2023

J-23

-------
POST - IRA - September 2017

POST - IRA-April 2021

POST-IRA-April 2022

POST - IRA - May 2023

DOMINION ENERGY
SOUTH CAROLINA. INC.

ILLUSTRATION OF NAPHTHALENE
CONCENTRATIONS

CALHOUN PARK AREA SITE
CHARLESTON, SOUTH CAROLINA

DATE: 9/12/2023	FILE NAME: NAPH 0523

	APEX COMPANIES. LLC

POST - IRA - September 2014

POST-IRA- March 2010

LEGEN1

5-50 ug/L
50-500 ug/L
500-5,000 ug/L
> 5,000 ug/L

Note: Due to "numeric dispersion"
the boundary extent
shown may be overstated.

START OF IRA -

POST - IRA - April 2020

POST - IRA-June 2018

Rl

Event - JaWiary l^f^y

Figure J-7: Illustrations of Naphthalene Concentrations from January 1994 to May 2023

J-24

-------
APPENDIX K- INTERMEDIATE GROUNDWATER DATA

K-l

-------
Table K-J: Intermediate Sand Unit Groundwater Monitoring Wells

Wells

Location

Upper Sond
BM-03D
BM-04D
MM-13C
PAMW-02

Sector 9 - East Bay

Charlotte Street

SCE&G Substation

Sector 1A - SC State Ports Authority

Middle Sand

BM-10C

Sector 9 - East Bay

MM-02D
MM-T2B

PM-01C

SCE&G Substation
SCE&G Substation
NPS Property

Sector 2A - SC State Ports Authority

Lower Sand
MM-01D
MM-IGD

SCE&G Substation
SCE&G Substation

Notes:

(i) Three wells were eliminated from the program ;r> 2015 and niclude
BM-08B (abandoned on May 28, 2015), and BM-07C and CM-11D
based on multiple non-detections and prior recommendations

i,2) LM-Q9B was el minated from the program in May 2017 based on multiple
non-detections and prior recommendations

(3)	MM- S4C was ei'minated from the program based on the August 16. 2019
request approved by SCDHEC on September 6.2319.

(4)	Sentinel wells (LM-08C and NM-06D) are sampled on a biennial
frequency, rnciuding December 2022.

K-2

-------
Table K-2: Analytical Parameters and Methods for Intermediate Groundwater Monitoring Program



EPA

Reporting

Cleanup

Constituent

Method

Limit ffjg/L)

Goal (M0/L}!"

Volatile Oraanie Constituents:







Benzene

8260C

5

5

Ethylbenzene

8260C

5

700

Toluene

8260C

5

1,000

Xylenes, Total

8260C

5

10,000

Semi-Volatile Oraanie Constituents







Benzo(a)pyrene

8270D

0,2

0.2

Carbazole

8270D

5

5'2'

Naphthalene

8270D

¦0

1.500

Notes:

(f) Re mediator) goals obtained from EPA Record of Decision for OU #2 at the CPA Site {September 2002}.

(2)	Indicates cleanup goal derived from nsx based calculations, rather than dnnking water standards (MCls)
A revised goal of 53 jjg/L has been proposed for shallow groundwater

(3)	Because the laboratory reporting limit (RL) varies with diluton. the laboratory provides analytical results
between the method detection limit (MDL) and RL and qualifies the results as estimated, •J".

K-3

-------
MIOOLE SANS UNIT WELLS

SOUTH CAROLINA STATE

PORTS AUTHORITY
CONTAINER STORAGE AREA

LOWER SAND JMT WELLS

ABANDONED WELL

UPFER SAME UNIT SAMRUNG LOCATION

MIDDLE SAND uNIT SAMPLING LOCATION
(BIENNIAL AT LM-06C AND NW-G6D)
LOWER SAND UNIT SAMPLING LOCATION

pm-828

sea3*

ELECTRICAL
SJ^STATlos

PU—QIC

PERMEOX PLUS OR EHC-0 TREATME!\T SECTOR

"RUCK ACCESS ROJTE

FENTON'S REAGEhJT TREATMENT SECTOR

REPRESENTS SECTOR IDENTIFICATION



EMbSMStt.	MW-IEC f



jsaisgssg^i:

CONTROL BUUDiNC

LV-36C

iSHEn

TWJ—iTC*T

*WO\RESIO

FWMER |
RETAIL

CAS
STATIC*
(VPWflK !

y^ncwji

MW-02D

HGH

voltage

above GiMXINB CABLE TRENCH

THREE STORY 3RICK BUILDING

LUCEN'S MARINE

F3*w_n

HIGH
vtLTACE

APPROXIMATE LOCATION
HETAJL BUIU3WC

JMHC' HAUI"i:>
A M1EFS

SHGLE-STCftr
STUCCO



CMU BUILDIK

&JB1E0 SEA *ALL

CvftCHETE
LOAHIVG AfiEA

FORMER

AUT10 PPDr SHttR

BUS LANE

AOtMmw WHARr xOAD

SERVICE AREA

APPROXIMATE GARAGE LOCATION

SOUTH CAPOUNA
AO.iA.RIUV

~T RPWE^ ]
, RETAIL ,
J GAS I
I ST«11C« \

' (AaPR{J3«. ,
I LCCATKIKJ

~BETTY S3UARE
(CRASS AND TREES AREA)

CHARLESTON
GATEWAT COLTER

FIGURE 1
DOMINION ENERGY
SOUTH CAROLINA. INC

INTERMEDIATE GROUNDWATER
MONITORING LOCATIONS

CALHOUN STREET

U	INTERLOCKING SHEET PILE WALL (20' liEEPJ

NOTE:

1) WELLS AM-CHD, EW-01D, DM-01D, AND
DM-OJD WERE ABANDONED ON DECEMBER
S AND 6,1004 AND THEREFORE ARE NOT
SHOWN,

2| WELLS 3M-0BBIC AND SM-11B'C WERE
ABANDONED ON MAY 28, 2015,

CALHOUN PARK AREA, SITE
CHARLESTON, SOUTH CAROLINA

DATE- 4/1J/ZQ

RLE VAME. CPAIGW073

GRAPHIC SCALE

APEX COMPANIES, LLC

4*- !¦«-!}

LEGEND

- JP=E=? SAND LNfT WELLS

Figure K-l: Intermediate Groundwater Monitoring Locations

K-4

-------
SOUTH CAROLINA STATE

PORTS AUTHORITY
CONTAINER STORAGE AREA

"RUSK ACCESS HOJTE

CHARLorrr strcct

DATE

BENZENE

NAPHTHALENE

11 .'00

4,200

10 U

10/01

2,600

10 U

05/05

4,600

13 U

02/06

3,100

10 U

09/06

IS,000

10 U

03/07

3,700

10U

09/07

1,700

10 U

06/08

3,8-00

10 U

Q3/Q9

4,700

10U

12/09

NS

NS

08/10

1,200

10U

06/11

340

10U

03/12

130

10 u

12/12

5 U

10 Lf

09/13

5 U

10 u

05/14

5 U

10U

03/15

52

10 u

12/15

63

10 LT

09/16

5 Lf

10 U

06/17

5U

10 u

03/18

906

10 u

12/1B

174

1DU

12/19

43

10 u

12/20

5U

10 u

11/21

6,1

iq u

12/22

8.7

9,3 U



LEGEND



UPPER INTERMEDIATE SWD UNIT WELLS
ABANDONED WELL

~2 - PERMEOX PLUS OR EHC-0 TREATMENT SECTOR

- FEVTDN'S KEAGEVT TREATMENT SECTOR
1A - REPRESENTS SECTOR IDENTIFICATION

NOTES;

1)	ALL RESULTS ARE IN UG'l,

2)	J - THE RESULT |S APPROXIMATE ,

S) U -THE CONSTITUENT WAS NOT DETECTED.

-fli NS. NOT SAMPLED.

5)	PAUV.M12 WAS NOT SAMPLED )NS| IN t2,'IM DUE TO SECURITY
CONSTRAINTS.

6)	BASED ON THE (WID ANALYTICAL RESULTS FSOiM MM-13C, |T
IS BELIEVED THAT MW-1,10 WAS INADVERTENTLY SAMPLED
SINCE THE BENZENE AND NAPHTHALENE RESULTS ARE
COMPARABLE TO MWM.1D HISTORICAL RESULTS,

7)	BM-PHB ABANDONED ON UAj ZB, Z015.	

j FORMER ,



DETAIL '



I =as I



I STATION

CHAF

I < ArPftO.«-

i urc4-ns»o,

GATEVi/

—



DATE

BEN2ENE

NAPHTHALENE

05/00

60,000

9,600

08/00

29,000

3,600

11 m

30,000

9,500

t0/01

35,000

11.000

12/01

45,000 J

7.600

041*05

54.000

11,000

02/06

10>000

7,600

09/06

37,000

9,900

03/07

21,000

14,000

09/07

14,000

5,900 J

06/00

30,000

15,000

03/00

35,000

16.000

12109

28,000 J

7,600

OB/10

34,000

11,000

06/11

24,000

12,000

03/12

19.000

14,000

12/12

26,000

14,000

09/13

25,000

6,200

05/14

30,000

10,000

03/15

27,500

13,300

12/15

26,300

10,600

09/16

26,200 J

9.640 J

06/1 7

23.300

11,800

03/1B

21,400

10,900

I2na

24,500

14.300

12/19

24,200

6.990 J

12/20

20,200

3,540

11/21

20,900

9,510

12/22

24,700

10,600

^r'^TliVS

MM-t3

C

DATE

BENZENE

NAPHTHALENE

10.'01

56.000

4.600

12/01

43.000 J

S.500

05/05

33,000

7,300

02/06

34,000 J

4,400 J

09/06

45,000

4,100

03/07

5-6,000

4,800

09/07

S.6Q&

4,100

06/08

36,000

3,600

03/09

39,000

5,500

12/09

29.000
5 U

3'9QQ <6>

10 IT '

08/10

06/11

31,000

4,300

03/12

16.000

3,300

11/12

23,000

4,500

09/13

39,000

3,300

05/14

34,000

3,900

03/15

1,540

3,460

12/15

33,000

3,500

HIS/16

25.000

3,610

(16/17

IB,300

4, see

03/18

26,400

2,760

12/18

29,000

4,570

12/19

28.400 J

2j43Q

12/20

17,900

763

11/21

22.400

2,990

12/22

17,300

3.200

DECEMBER 2022 EVENT AND HISTORICAL
BENZENE AND NAPHTHALENE ANALYTICAL
RESULTS UPPER INTERMEDIATE SAND UNIT

CALHOUN PARK AREA SITE
CHARLESTON, SOUTH CAROLINA

RLE NAME- CPAICW083
APKX COMPANIES, LLC

Figure K-2: Historical Benzene and Naphthalene Analytical Results in Upper Intermediate Sand Unit from 2000 to 2022

K-5

-------
BM-10C

DATE

BENZENE

NAPHTHALENE

10/01

14,000

1,800

04/05

20,ODD

2200

02/06

5.900

160

Mm

46

150 E

03/07

5,8

10 U

09/07

5 U

10U

06/0B

5U

10U

03/09

5 U

10 U

12/09

9 U

10U

08/10

NS

NS

oe.*ii

NS

NS

03/12

9,1

iou

09/13

3P7DD

390

05/14

7,700

830

03/15

6,510

996

12/15

9.890

1.220

09/16

7r370

385

06/17

155

10U

03/16

5.230

411

I2i'18

10,300

988

12/19

4.980

408

\ 2,(20

5.350

292

11/21

NS

NS

12J22

2,300

667

n

npnp.

t UYEK OElLTt

CM-11D
l~DATE BENZENE

0M00
OSi'DQ
llrtNt
IWOt
(WD5
07JD6
09.06
OJi'OT
0B.'D7
OEi'DB
OZHW
12/0-3
06.10
06.'11
03/12
12/12
09/11
05/14
01/15
12/15
06/17
12/18
121*19
12/20
11/21
12/21

HAPHTHALEHE

9,400

32

S.9O0

43

12,000

10 U

5.600

69

48

10 U

41

10 U

360

10 U

S3

10 U

2,700

10U

19

10U

$

10U

7

10 u

9.2

10 u

$U

10U

5,4

IOU

5 U

10 u

5U

10 u

$U

10 U

sir

10 u

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

legend

MIDDLE INTER VEDIATE SAND LIMIT WELLS
ABANDONED A'ELL

I - PERMEOX PLUS OR EHC-0 TREATMENT SECTOR

FENTON'S REAGENT TRE^.TME^T SECTOR
REPRESENTS SECTOR IDENTIFICATION

~

12 -

NOTES:

1)	ALL RESULTS ARE in U&'L,

2)	E - THE CQNSTIIUENT WAS DETECTED ABOVE THE
CALIBRATION CURVE,

2) R- UNUSABLE RESULT,

41 U -THE CONSTITUENT WAS NOT DETECTED AT THE REPORTING
DETECTION LIMIT.

5'J Uvl - THE CONSTITUENT WAS NOT DETECTED AND THE
REPORTED QUANTITATION LlMlT IS APPROXIMATE,

6)	J- THE CQNSTlIUENT WAS DETECTED Mil r HE RESULT IS
APPROXIMATE BASED ON DATA VALIDATION.

7)	NS - NOT SAMPLED,

81 BASED ON THE MARCH 2015 GROUNDWATER MONITORING
REPORT, &M-G7C AND CM-11D WERE ELIMINATED FROM
GROUNDWATER SAMPLING,

91 BASED ON THE SEPTEMBER 2016 GROUNDWATER MONITORING
REPORT, LM-QSB WAS ELIMINATED FROM GROUNDWATER
SAMPLING,	,

10| BASED ON THE DECEMBER 2010 GROUNDWATER MONITORING
REPORT AND SUBSEQUENT SCDHEC APPROVAL MW-14C WAS
IMINATFD FROM GROUNDWATER SAMPt I NO,

| BM-10C WAS BUHlEEi UNDER A SOIL P|L£ AMD NOT SAMPLED
RING THE DECEMBER 2021 EVENT,

	___	WHAKr	—



aaa«»ifliaar*^
-------


NOTES!

1 j ALL RESULT?* ARE IN UG/L.

2)	J-THE RESULT |S APPROXIMATE,

3)	U - THE CONSTITUENT WAS NOT DETECTED.

4)	UJ - THE CONSTITUENT WAS SOT DETECTED AND THE
REPORTED QUANTITATION LIMIT |S APPROXIMATE.

5l NA - NOT AVAILABLE.

SC3PA
ELECTRICAL

SLBSTAT10S

¦RUCK ACCESS ROUTE

CHARt OTJW STRFFT

CHARl OTTF STREET

INTERLOCKING-^
SHEET PILE -WALL

TWC-STCftY
wxovjcaa

RE3DEVT1A1_

FORMER |
DETAIL |

GAS
STATION

(aPPWic. :
WCATOwy

ABOVE WCUSO CAELE T=EKlH

THREE STTJRT BRICK 9UIL91K;
	 LJCEN'S MARINE

HICH
YOLTMjE

VOLTAGE

APPROXIMATE LOCATION
RETAIL BUILDING

HSHE3. HAMPICH
A MTEhi f»E*LT*

SIHCLE—STCftT

STUCCO

CML 9UILDIWJ

BURIED SEA «ALL

COftvRETE
L0A3INC *REA

FDRMEH ;

ajto Booy srtcri

lrffflWC_LOCATlDklJ

WIMM6D

NAPHTHAI.FNF

DATE

BENZENE

01.*94
12/96
1Q/01
04,-05
02/06
09/06
03/07
09/07
06/08
02/09
12/09

oa/10

06/11
03/12
12/12
09/13
05/14
03/15
12/15
09/16
06/17
03/18
12/16
12/19
12/20
11/21
12/22

AGUAftfLtM WiAPfi ROAD

SERVICE AREA

WOT
04/05
02/06
09/06
03/07
09/07
0

02/09
12-09
0B/10
06/11
01/12
12/12
09/1J
05/14
03/15
12/15
09/16
06/17
01/16
12/18
12/19
12*2*1
11/21
12/22

SOUTH CAROLINA
AOUAftlUM

I FORMED |

. RETAIL i

> CAS I

I STATION | CHARLESTON
Il22X)' ^TCWAYCENItH

UBEW SQUARE
0BRA55 AMD TREES ARE'.;

DOMINION ENERGY
SOUTH CAROLINA, INC

DECEMBER 2022 EVENT AND HISTORICAL BENZENE
AND NAPHTHALENE ANALYTICAL RESULTS
LOWER INTERMEDIATE SAND UNIT

CALHOUN PARK AREA SITE
CHARLESTON, SOUTH CAROLINA

FILE KAsaE CPA1GWQ85

GRAPHIC SCALE

APEX COMPANIES, 1 LC

SOUTH CAROLINA STATE
PORTS AUTHORITY
CONTAINER STORAGE AREA

Figure K-4: Historical Benzene and Naphthalene Analytical Results Lower Intermediate Sand Unit from 1994 to 2022

K-7

-------
Table K-3: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzetrre

HaphthaSene

2,4-Dimethyl phenol

Benzoi'ajpyrene

Cairbazole

Etfvyibenzeoe

Toluene

Total Xyterws

5

1.500

700

02

5

700

1.000

10,000

Wei!

Date Sampled

















AM-03D

1/14/1994

200 U

10 U

10 U

10 U

10 U

200 U

200 U

253 U

AM-03O

121/1998

5 U

9.6 U

9.60 U

0.29 U

4.3 U

5 U

5 U

5 U

AM-03D

1 1/14)2000

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

AM-03D

1Di'12/2QQ1

5 U

10 U

ID U

D.2 U

10 IJ

5 U

5 U

5 U





















EM-01D

US/I 994

10 u

10 U

ID UJ

10 U

10 U

to U

10 U

10 U

BM-01D

12W1908

5 U

9 U

1D U

0.23 U

470 U

5 U

5 U

5 U

BM-01D

11 M3i2Q0CI

5 U

10 U

1D U

10 U

10 U

5 U

5 U

5 U





















BM-03D

11/14.2000

30.DD0

9.500

37 J

SCO U

45 J

3400

3.100

2500 U

BM-030

1D1&2Q01

35,000

11.000

35

10 U

10 U

3S0Q

4200

2,800

BM-030 LOWER

124(2001

53,003 J

5.700

15

10 U

to U

5.000

5JOO

3600

BM-030 UPPER

124/2001

45.000 J

7 800

25

10 U

10 U

5.300

5,900

3.800

E3M-030

4,f2&l2Q05

54,000

11 '000

10 U

10 U

10 U

3 700

0.500

4200

BM-030

9'132005

37,000 J

3200

ID UJ

10 U

10 U

2 300

6 600

4,630

BM-030

1MU2DD5

24,000

3.100

220 UJ

37 UJ

350 UJ

2.300

*300

3200

BM030

1/9/2006

1,500

4.900

10 U

10 U

10 U

1 600

2,100

1 '320

BM-030

2,24.'2oae

13,000

7 500

36

10 U

10 U

2200

1 600

1.880

BM-030

6/130009

24,000

6 300

100 U

100 U

too U

2100

2600

1.050

BM-03D

#11/2000

37,000

9-500

10 U

10 u

10 U

3 300

3,100

1.790

BM030

121/2006

27,000

9.300

10 U

10 u

to U

2400

5.S0G

3.3C0

BM-03D

1'13/2007

21,000

14.000

2,500 U

10 u

10 U

2.300

940

1,810

BM-030

9122D07

14,000

5:500 J

10 U

10 u

10 U

22-00

540

1,180

BM-030



30,000

15,000

ID U

10 u

to U

3200

4.100

2100

BM-030

3K2/2009

35,00:•

13.000

220 UJ

37 UJ

350 UJ

4200

7.000

3,830

BM-030

12/17/2000

28,000 J

7JS00

61 J

13 UJ

51 UJ

3200 J

5200

3,000

BM-030

S,'2Qi20IO

34,000

11 000

68

10 U

10 IJ

4 400

4.630

3200

BM-03D

arason

24,000

12.000

10 UJ

10 UJ

10 UJ

<100

3,000

2400

BM-030

3,'14;2012

19,000

54,000

1D UJ

10 UJ

10 UJ

3 000

1.100

1 630

BM-03O

1242012

25,000

14 000

28 J

14 UJ

10 UJ

3200

960

1.610

BM-03D

W16<20!3

25,000

3 230

15 UJ

10 UJ

14 UJ

3,400

340 J

1.443

BM-030

922^2014

30,000

10.000

35 UJ

10 UJ

10 J

3.600

320 J

1.300 J

BM-03D

3/ 15:20 ¦ 5

27,500

13 330

10 U

10 U

10 U

2400

93

611

BM-030

1222:2015

26,300

10,300

10 U

10 U

10 U

3250

134 J

75d

BM03D

9/2BGQ16

26200 J

9.640 J

ID U

10 U

10 U

3470 J

146 J

4 39 J

BM-030

&W2017

23,300'

11 £00

17 U

10 u

10 U

3.S00

132 J

759

BM-030

32220IS

21,400

10.000

ID U

10 u

10 u

2900

123 J

463 J

BM-030

12/13^2018

24,500

14 300

1D U

10 u

10 U

3.960

110 J

610 J

BM-030

12/12/2010

24,200

6 330 J

NA

02 U

6

4070

55 U

434

BM-030

1222020

20,200

3.540

NA

0.19 U

7.7

3450

53.1 J

562 J

BM03D

11 29/2021

2D.9D0

9.510

NA

0.2 U

0.1

3230

62.3 J

442 J

EM-030

12&2D22

24.7DD

TOSCO

NA

0.2 U

0.2

34:0

97.8 J

624 J





















BM-030 DUP

11/14/2000

30,000

8.000

17 J

100 U

45 J

3.6CO

2703

2,530 U

BM-030 DUP

124.200'

32,000 J

6.8Q0

13

10 U

10 U

5,500

6.000

3:500

BM-030 DUP

1'1&'2007

20,000

12000

10 U

10 U

10 IJ

2400

960

1 870

BM-03D DUP

3.'122007

15,000

4.000 J

10 U

10 U

10 U

2430

550

1260

K-8

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzefw

Naphthalene

2,4-Dimethylpfce-no!

Benzoi'ajipyTene

Carbazole

Etftyfbenzeflie

Toluene

Tcrtal Xylene's

5

1.5&G

700

02

5

700

1.0CH}

10,000

Well

Date Sampled

















BM-03D DUP

6.r16/2DQi5

20.ODC'

1c ,000

10 U

10 U

10 U

2.900

3.700

2200

BM-03D DUP

sasias

38,000

20.000

220 UJ

37 UJ

350 UJ

4500

7x00

4500

BM-03D DUP

12.'17<2009

20,000 J

7.DC0

54 UJ

13 UJ

51 UJ

4 .000 J

6.300

3600





















BM-Q4D

11/13/2000

20,DD2

5.600

50 U

50 U

50 U

2 .5C0 U

2,500 U

2.500 U

BM-04D

ID-' 10=2001

20.000

7j00

24

to U

10 U

2,700

1 4D0

2.600

BM-Q40

4S23i2005

14.000

6.500

10 U

10 U

10 U

1700

500

5.340

BM-04D

2S3.-2QM

20.DCC

6.700

10 U

10 U

10 U

2.500

500 U

1.950

BM-04D

Sm/2003

9.7DQ

2 500

5C U

50 U

50 U

1 400

1 000 U

1 OQO U

BM-Q4D

3/1SQ0O7

13.000

7 500

10 U

10 U

10 U

1 900

250

1.350

BM-040

fl'1!S0D7

25,000

5.600

10 U

10 U

10 u

3.4:0

50Q U

2.060

BM-MD

#17,2005

19.DD0

9 400

10 U

10 U

10 u

2,500

350

1243

BM-04D

2J25!20D>?

22.DD0

7,SCO

220 UJ

37 UJ

350 UJ

3,100

250

1.710

BM-04D

12/15.2000

14,000

6.700

10 U

¦0 U

10 U

2400

3D0

144D

BM-04D

&'1ft2010

10,000

£ .500

10 U

10 u

10 U

3.100

261

1.550

BM-04D

&22.<2011

13,000

5.300

10 UJ

to UJ

10 UJ

S.700

130

910

BWaMD

3/13GDI2

11,000

5.K0

10 UJ

to UJ

10 UJ

1 6C0

150 J

740

BM-04D

12C/2D-2

13,OK

4.600

1D UJ

to UJ

10 UJ

1900

130 J

900

BM-04D

W15G013

11,000

1 720

10 U

10 U

10 u

930

45 J

440

B^Z4D

5/222014

15,000

S.700

10 U

10 u

10 u

1.300

75 J

660

BM-04D

3MS/2Q15

11.400

7650

34 UJ

10 UJ

12 UJ

1J0E0

57

607

BM-04D

12.21.2015

2* 43:

9.020

10 U

10 u

10 u

27 UJ

112 J

39 UJ

BW04D

9,27.2016

20,200

3.310

10 U

10 u

10 u

1.7S0

tea j

775 J

BM-04D

3.7,2017

16,700

9 730

10 U

to u

10 u

2.410

.33a J

1,290

BM-34D

3/22CD15

12600

6 550

10 U

10 u

10 u

1,170

62 J

256 J

BM-04D

12.1S.2018

7,130

4.210

10 U

10 u

10 u

644

20 J

194 J

BM-04D

12/12/2019

9,450

3 620

NA

3.5

49 U

747

21 U

157

BM-040

122.2020

16,000

2.430

NA

2.2

k

J

946

23.6 J

309 J

6M4MD

11 "292021

17,700

9.020

NA

0.72

5 U

920

25.3 J

271

BM-04D

12^2022

10,500

11 500

NA

0.70

5.3

V070

35.0 J

445





















EM-05D

11.14.2000

220

25

2*

10 U

53

25 U

25 U

75

BM-05D

10/13/2001

14

10 U

10 U

10 U

52

5 U

5 U

25





















BM-Q6C

10-11-2001

100

10 U

10 U

10 U

10 U

5 U

5 U

5 U



4.262035

62

10 U

10 U

10 U

10 U

5 U

5 U

5 U

BM-06C

3/1&2007

65

10 U

10 U

10 U

10 U

33

5 U

357

BMO18C

py.2007

25

10 U

10 U

10 U

10 U

5 U

5 U

5 U

EVPZ"cC

6'1E,203E

2&

11

ID U

10 U

10 U

5 U

5 U

5 U

BM-06C

3.2.2009

12

10 U

10 U

10 U

10 U

5 U

5 U

5 U

EM-06C

1221.2009

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

EM-QOC

Sa&CQIO

5 U

10 U

1D U

10 u

10 U

5 U

5 U

5 U

BM-asc

6S2I2011

5 U

10 U

10 U

10 u

10 U

5 U

5 U

5 U

BM-05C

3,' 14.20 '2

5 U

10 u

ID U

10 u

10 u

5 U

5 U

5 U

BM-OflC

12/4,2012

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

BM-06C

9'15.2013

5 U

10 u

ID U

10 u

10 u

5 U

5 U

5 U





















K-9

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup G&a!:

Benzeeie

ftaphthaSene

24-Dimethyl phenol

Benzotajpyiene

Carbazole

Eshyibenzene

Toluene

Total Xylenes

5

i.500

700

02

5

700

1,000

10,000

Well

Date Sampled

















BM-07B

!0'1&2001

5 U

10 U

10 U

10 u

10 U

5 U

5 U

5 U





















BM-07C

10/192001

760

13

10 U

10 u

10 U

130

170

130

BM-07C

4070005

130

15 R

10 UR

10 UR

10 UR

71

5 U

65

BM-37C

2010006

100

10

10 U

10 U

10 U

57

5 U

15

S M-07C

&'H/2D06

67

10 u

10 U

10 U

10 U

52

5 U

3

BM-07C

3/19OD07

07

15

10 U

10 U

10 U

50

5 U

23

BM-07C

af12"2007

37

10 IJ

10 U

10 u

10 U

41

5 U

7

BM-07C

6/170008

68

10 U

10 U

10 u

10 u

53

5 U

5 U

BM-D7C

31/22000

45

11

10 U

10 u

10 u

23

5 U

6.5

BM-07C

12/17.2006

50

14

10 U

10 u

10 u

15

5 U

5 U

EM-07C

5/200010

21

10 U

10 U

10 u

10 u

7

5 U

5 U

BM-07C

6020011

17

10 U

10 U

10 u

10 u

5 U

5 U

5 U

EM-07C

3®2012

5.B

10 u

10 U

10 u

10 u

5 U

5 U

5 U

BM-07C

12WO012

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

BM4J7C

rdi iaoot3

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

EM07C

5/200014

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

BM-07C

1/19O015

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U





















BM-O0B

1Q' 1 Z'2DQ 1

46.000

12,000

35

10 u

10 u

3.000

a.ooa

4,500

BM-03B

5/3/2005

24,000

12,000

10 U

10 u

10 u

3.000

3.700

2500

BM-05S

anarans

13,ODD

2,700

22

10 u

to u

640

580

{.060

BM-OSB

11&2DQ5

14,OK1

4 300

10 U

10 u

10 u

fJDOQ

1.300

* 550

EM-OEB

1 <9/2006

9,500

6,900

26

10 u

10 u

1 oca

1,800

¦5 200

EM-OBB

2240D36

9.600

9.800

72

10 u

10 u

590

1.400

1,660

EM-058

firi4fflDB6

22,ODD

5,500

34

10 u

10 u

1.200

990

6E0

BM-OSB

9/3/2006

10,003

7.SG0

10 U

10 u

10 u

2JMQ

1.930

1,810

BM-OSB

11 ¦¦30.200S

400

10 U

10 U

10 u

10 u

46

110

250

BM-OSB

5/190007

6,100

e.coo

10 U

10 u

10 u

€40

800

1.170

BM-OBB

9,'U2007

6,000

2:900

10 U

10 u

10 u

660

920

560

EM-0-E8

6/17,-2000

23,000

9.400

10 U

10 u

10 u

1.800

2930

2433

BM-088

2*250009

10,000

9.900

220 UJ

37 UJ

350 UJ

2300

2900

2-330

BM-OSB

12/15.2009

14,002'

6.330

10 U

10 u

10 u

1.930

2000

t„920

BMOSB

8000010

20,003

3.400

10 U

10 u

10 u

2100

1,700

2000

BM-OSB

6020011

15,003

5,600

23 J

10 UJ

10 UJ

1.900

1 700

1450

BM-OSB

3fli2D12

16,003

3.800

10 UJ

10 UJ

10 UJ

1 SCO

1 300

1.380

BM-OSB

t2ftOQ12

15,003

4.400

16 J

10 UJ

10 UJ

1.600

1.100

1.180

BM-OSB

0(172013

7,703

1 700

10 U

10 u

10 u

1.100

620

660

BM-OSB

5000014

2,603

35

10 U

10 u

10 u

450

5:90

230

BM-OSB

3/17/2015

1.180

714

10 U

10 u

10 u

345

104

190





















EM-SC

1CL'12/2001

10,000

2,800

10 U

10 u

10 u

1.500

520

720

BM-03C

s-a;2005

4,600

750 J

10 U

10 u

10 u

ESQ

400

470

BM-08C

9' 13,2 Dj5

38

10 U

10 IJ

10 u

10 u

5 U

5 U

5 U

BM-OSC

11BOD05

8

10 U

10 U

10 u

10 u

5 U

5 U

5 U

BM-OSC

1.9-2006

2,100

?ao

10 U

10 u

10 u

330

44

91

BM-O&C

2040006

130

27

10 u

10 u

10 u

120

5 U

61

K-10

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benze*>e

Naphthalene

Z4--Dimethylp-?no!

Benzo(a)pyrene

Carbazole

Ethyflbenzerve

Toluene

Total Xylenes

5

1.5W

700

0_?

5

700

1.0&D

10,000

Well

Date Sampled

















EM-08C

6/14,2006

16

ia u

10 U

10 u

10 U

5 U

5 U

o

BM-OSC

9V3/2Q06

7

ia if

10 U

10 u

10 U

5 U

5 U

5 U

BMtfBC

11/30/2006

7

10 u

ID U

10 u

50 U

5 U

5 U

g U

BM-OSC

3f19/2Q07

5 U

10 u

10 U

10 u

10 U

g U

5 U

5 U

BM-OSC

W11/3Q07

5 U

1G U

10 U

10 Q

10 U

5 U

5 U

5 U

EM-G0C

sn.QQoa

5 U

10 U

10 U

10 u

10 U

5 U

5 U

g U

em-oqc

2G5C2MB

5 U

10 U

10 U

10 u

10 U

5 U

g U

g U

BNW8C

12/15/2009

5 U

10 u

10 u

10 u

10 U

5 U

g U

g U

BM-03C

3/6/20 12

5 U

10 u

10 u

1D U

10 u

5 U

5 U

5 U

BM-OSC

9/17CD13

5 U

10 u

10 u

10 li

10 u

£ U

5 U

5 U





















BNHKC CUP

5,i"i2005

4,800

1 6X3 J

10 u

10 U

10 u

650

4jO

470





















BM-10B

ID'1221X11

38

10 U

10 u

10 U

50 U

5 U

5 U

5 U

BM-1QB

4/27/2005

19

10 U

10 u

10 U

10 U

g U

5 U

g U

BM-?0B

2/24,(2033

5 U

10 U

10 u

10 U

10 u

5 U

g U

5 U

BM-1QB

3/10/2OB7

5 U

10 U

10 u

10 u

10 u

5 U

5 U

5 U

BM-liOB

9i 22007

5 U

10 u

10 u

10 u

10 u

g IJ

g U

5 U

BM-1QB

fflisaooa

5

10 u

10 u

10 u

10 u

5 U

5 U

6 U

EM-^oe

3/2/2006

5 U

10 u

10 u

10 u

10 u

5 U

g U

g U

BM-10B

1221.2006

5 U

10 u

10 u

10 u

10 u

5 U

5 U

g U

BM-1C6

B0Q/2Q1O

5 U

10 u

10 U

10 u

10 u

g U

g U

g U

EM-10B

023/2011

5 U

10 u

10 U

10 u

ia u

g U

g U

5 U

BM-10B

3/8/2012

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EM-1QB

12/4*2012

5 U

10 u

10 u

10 u

10 u

g U

5 U

g U

BM-10B

a'ia2Q13

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U





















EM-ice DUP

124,2012

5 U

10 u

10 u

10 LI

ia u

5 U

5 U

5 U

BM-1QB DUP

ft''1SE013

5 U

ia u

10 u

to u

10 u

5 U

5 U

5 U





















BM-IOC

10.122001

14.DOO

1,500

10 u

10 u

10 u

50Q

260

260

BM-IOC

4,27,"2005

20,000

2200

10 u

10 u

10 u

12C0

250 U

700

EM-IOC

9/14,2005

2t,ooo

¦sea







760

250 U

280

BM-1QC

11/62035

9,800

200

10 u

10 u

10 u

300

100 U

330

em-»oc

1/9/2006

11,000

310 J

10 u

10 u

10 u

250 U

250 U

25Q U

EM-IOC

2'24/2QQ6

5,600

?&0 J

10 u

10 u

10 u

270

16

263

em-ioc

& 14,2008

300

110

10 u

10 u

10 u

170

12

67

BM-IOC

ari i/2oa&

46

130 E

10 u

10 u

to u

16

5 U

16

EM-IOC

11.202006

16

10 u

10 u

10 u

to u

5 U

5 U

5 U

BM-IOC

3/'1&2007

5.6

10 u

10 u

10 Li

10 u

e

5 U

5 U

BM-IOC

9/12/2Q07

5 U

10 u

10 u

10 u

10 u

g u

5 U

5 U

BM-IOC

6/16,2008

5 U

10 Lf

10 u

10 u

10 u

g u

g U

g U

BM-JGC

3/22009

5 U

10 u

10 u

10 u

10 u

5 U

5 U

g U

EM-IOC

1221.12009

5 U

10 u

10 u

10 u

10 u

g u

g U

g U

BM-^OC

3.-18.2012

9.1

10 u

10 u

10 u

10 u

g u

5 U

g U

BM-IOC

9/1620!3

3,700

39a

10 u

10 u

10 u

4?a

81

205

BM-IOC

5,222014

7,TOD

830

10 u

10 u

to u

&sa

200 J

320 J

K-ll

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzew

Haiphthafefie

2^t-DimetfryJ phenol

Benzoi'a)pyTene

Carls scale

Etfty! benzene

Toluene

Total Xylenes

5

1,500

700

02

5

700

f.OOG

10,000

WelS

Date Sampled

















BM-'OC

3/18/2015

6.510

936

10 U

10 U

io u

763

153



EM-'CC

1Z.'ia.2Q15

9,890

1220

10 U

10 U

10 u

719

100

321

BM-IOC

SV26/2D16

7,370

155

10 U

10 U

10 u

349

49 J

m j

BM-IOC

0-T-'2d 17

155

10 U

10 U

10 U

10 u

5 U

5 U

5 U

BM-IOC

3/22/2018

5.230

411

10 U

10 U

10 u

307

30 J

769 J

EM-'CC

12/13/2016

10,300

933

10 U

10 U

10 u

782

55 J

456 J

BM-IOC

12/12/2019

4,960

403

NA

02 UJ

5 UJ

572

10.3 J

2E3

BM-IOC

12/20020

5.350

292

IMA

D2 U

5 U

694

13.3 J

347

BM-'QC

12BQ022

2,300

667

NA

D2 U

5 U

461

5 UJ

256





















BM-IOC DUP

4/272005

20,000

2,000

10 U

10 U

10 u

1.200

250 U

670

BM-IOC DUP

9/11Q0O3

43

95

10 U

10 U

10 u

10

5 U

17





















EM-MB

6/15/2006

5 U

10 U

10 U

10 U

10 u

5 U

5 U

5 U





















BM-11C

6/15-2DD6

9

10 U

10 U

10 U

10 u

5 U

5 U

5 U





















CM-01D

1/10/1994

15,000

67

20 U

20 U

20 U

770

500 U

420 J





















CM-06D

11/13112000

5 U

10 U

10 U

10 U

10 u

34

5 U

13

CM-06D

1024Q001

5 U

10 u

10 U

10 U

10 u

13

5 U

19

CM-06D

4/26/2005

5 U

10 u

10 U

10 U

10 u

5 U

5 U

5 U

CM-06D

2/22/2009

5 U

10 u

10 U

10 U

10 u

5 U

5- U

5 U

CM-06D

3/1&2KJ7

5 U

10 u

10 U

10 U

10 u

5 U

5 U

5 U





















CM-07C

11/1flG!D00

5 U

10 UJ

10 UJ

10 UJ

10 UJ

5 U

5 U

5 U

CM-07D

10H 12001

5 U

10 u

10 U

10 U

so u

5 U

5 U

5 U

CM^Q7D

4,'26/2005

5 U

10 u

1D U

10 u

10 u

5 U

5 U

5- U

CM-07D

2'23/2006

5 U

10 u

1D U

10 u

10 u

5 U

5 U

5 U

CM-07Q

J-W2Z07

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U





















CM-11D

11/1320D0

12.000

10 u

10 U

10 u

15

500 U

500 U

500 U

CM-11D

10'17200:

5,600

09

1D U

10 u

10 u

13

5

13

CM-11D

4292005

4S

10 u

10 U

10 u

10 u

5 U

5 U

5 U

CM-11C

^'14;20j5

36

10 u

10 U

10 u

10 u

5 U

5- U

5 U

CM-11C

12:102005

3D

10 u

10 U

10 u

10 u

5 U

5 U

5 U

CM-11D

2E2/2D0B

45

10 u

10 U

10 u

10 u

5 U

5 U

5 U

CM-11D

4/2&2Q06

4»

10 u

10 U

10 u

10 u

5 U

5 U

5 U

CM-11D

ffl12ffl006

353

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-110

emoooe

360

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-11D

11/30/2006

3M

10 u

10 u

10 u

10 u

5 U

5 U

6

CM-11D

3/1&2007

93

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-11D

9/122ED7

2.700

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-11D

6/1B/2Q08

19

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-11D

2'26,l20O9

5J

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-11D

12.'152OD0

7.0

10 u

10 u

10 u

10 u

5 U

5 U

5 U

CM-11C

£'20/2010

92

10 u

10 u

10 u

10 u

5 U

5 U

5 U

K-12

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzene

Ifaphthatanse

2,4-Dimethyl phenol

Benzo(a)pyTene

Carbazole

Etitiyfbenzesve

Toluene

Total Xyt«*es

5

1t500

700

0.2

5

700

1.000

10,000

Well

Date Sampled

















CM-11D

6/222011

5 U

to U

10 U

to u

to U

5 U

5 U

5 U

CM-11C

3/14,20'2

54

10 U

10 U

10 u

10 U

5 U

5 U

5 U

CM-11D

124/2012

5 U

10 U

10 u

10 u

50 U

5 U

5 U

5 U

CM-11D

0/1.5/2013

5 U

10 U

10 u

10 II

10 U

5 U

5 U

5 U

CM-11Q

5(2010014

5 U

10 U

10 u

10 u

10 U

5 LI

5 U

5 U

GM-11D

3M8QQi£

5 U

10 li

10 u

10 u

10 U

5 U

5 U

5 U





















DM-01D

VIW19W

10 U

10 U

10 U

10 u

10 U

10 U

10 U

10 U

DM-01D

12W1SSB

5 U

9.5 U

S.5 U

0.23 U

4.30 U

5 U

5 U

5 U

DM-01D

11/14/ZDDD

5 U

10 U

10 u

10 U

10 U

5 U

5 U

5 U

DM-Q1D

ID/252001

5 U

10 U

10 U

10 U

10 U

5 U

5 U

rn

a





















DM-02D

1/7/1994

10 U

10 U

1D UJ

10 u

10 U

to U

to U

to u

DM-Q2C

12W19BB

5 U

10 If

10 U

0.31 U

5.20 U

5 U

5 Lf

5 U

~M-Q2D

10/24/2001

5 U

10 U

10 u

10 U

10 U

5 U

5 U

5 U





















0RW-D2

12*3/1990

4,600

2.500

550

0.30 U

57

580

3.000

1.400

DRW-C2

11/16/2000

9200

4 iQQ J

10 UJ

10 UJ

74 J

1 500

6 400

2.180





















EB1D1SQ1

1Q' 18/200r

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

EB102301

1 Q23/200'

5 U

10 U

10 U

10 U

50 U

5 U

5 U

5 U

EE 102431

10/24/2001

5 U

10 U

10 U

10 U

SO U

5 U

5 U

£ U

EB111430

11 ¦14:2000

5 U

to U

10 U

10 U

10 U

5 U

5 U

5 U

EB12050I

12*5/2001

5 U

10 U

10 u

10 u

10 U

5 U

6

5 U

BB030905

3-9/2005

5 U

10 U

10 u

10 u

10 U

5 U

5 U

5 U

EBQ42S06

4Q&2005

5 U

10 li

10 u

10 u

10 U

5 U

£ U

5 U

EB050305

5/3-2005

5 U

17

10 u

10 u

10 U

5 U

5 U

5 U

EBQ913C6

ffl13,20G5

5 U

10 U

10 u

10 u

10 U

5 U

5 U

5 U

EBO10906

1/9/2006

5 U

10 U

10 u

10 u

10 U

5 U

5 U

5 U

EEC2220?

2/22GD03

5 U

tQ U

10 u

10 u

10 u

5 U

5 U

5 U

EB0613C6

&f13J2C06

5 U

10 U

10 u

10 u

10 u

5 U

5 U

5 U

EBQ315Q7

3/15/2007

5 U

10 U

10 U

10 u

10 U

£ U

5 U

5 U

EB032107

3,2 1/2007

5 U

10 U

10 u

10 u

10 U

5 U

5 U

5 U

E306DK7

9/9/2007

5 U

10 U

10 U

10 u

10 u

£ U

5 U

5 U

EB06170S

817/2000

5 U

10 U

10 u

10 u

ia u

5 U

5 U

5 U

EBQ225G9

2/2S2009

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EB1216DB

12-16-2009

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EB0319'I

5; 19/20'0

5 U

10 u

10 u

10 u

m u

5 U

5 U

5 U

EB0620T T

6,2i020lt

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EB030512

3/52012

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EB112012

11/29.2012

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 LI

E3O017H3

9/17/2013

5 U

10 u

10 u

10 u

10 u

£ U

£¦ U

£ U

EB0520J4

500/2)014

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

003172015

3,f17/2D15

15

10 u

10 u

10 u

to u

5 U

5 (J

£ U

EE12182015

12-'18.2015

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EBG926-C

¦5.2.5.2016

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

EBQ6062017

6-1-2017

5 U

10 u

10 u

10 U

10 u

5 U

5 U

5 U

K-13

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup GoaJ:

Benzene

fephtha&ene

Z4-Dimethylphe-nol

Benzoi'a)pyTene

Carbazole

Etfrytbeazesre

Toiuene

Total Xyt«>es

5

1,500

700

0.2

5

700

1,000

10.000

Wel«

Date Sampled

















EBQ3221S

aC2ZCD1S

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

EB12131S

12/13/2018

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

EB12113019

12''11/2019

5 U

11 u

NA

0.2 UJ

5 UJ

5 U

5 U

5 U

EB12D12G

12/1G02Q

5 U

9.9 U

NA

D.2 U

5 U

5 U

5 IJ

5 U

EE 11292*

11/20/2021

5 U

10.0 U

NA

0.21 U

5.2 U

5 U

5 U

5 U

EB120622

(2/5/2022

5 U

9.7 U

NA

0.19 U

4.9 U

5 U

5 U

5 U





















EBMW-06

11/14/2DD0

29

10 U

ID U

10 U

10 U

5 U

5 U

5- U

EBMW-DS

1 D'23"2DD 1

25

10 U

ID U

10 U

10 U

5 U

5 U

§ U





















EBMW-07

11/14/2000

12

10 U

1D U

10 U

10 U

5 U

5 U

5 U

EEMrt'-07

10.212001

35

10 U

10 U

10 U

ID U

5 U

5 U

5 U





















LM-D3D

1/18/1 £©4

10 U

to U

1D U

10 U

10 U

10 U

10 U

10 U

LM-030

11/17/1998

5 U

10 U





10 U

5 U

5 U

5 U

LM-030

12/2/19SS

5 U

10 u

0.90 U

0.20 U

5 U

5 U

5 U

5 U

!_M^S3D

3/10/1999

5 U

5 LI

5 U

5 U

5 U

5 U

5 U

5 U

LM03D

11/15.2000

5 U

10 U

ID U

10 U

10 U

5 U

5 U

5 U

LM-030

1 Q'24/2001

5 U

10 U

1D U

10 U

10 U

5 U

5 U

5 U





















LM-OSC

11/16.20DO

5 U

10 UJ

1D UJ

10 UJ

10 UJ

5 U

5 U

7

LM-OSC

10/10/2001

25 U

33

10 U

10 U

10 U

25 IJ

25 U

25 U

LM-DSC LOWER

12S2DQT

6 UJ

19

1D U

to U

10 U

5 UJ

5 UJ

5 UJ

LM-OSC UPPER

12/3/2001

7 UJ

67

1D U

10 U

10 U

a UJ

5 UJ

3 J

LM-OSC

4(26/200®

5 U

10 U

ID U

10 U

10 U

5 U

5 U

5 U

LM-OSC

3230009

5 U

10 U

1D U

10 u

10 U

5 U

5 U

5 U

LM-OSC

3/16ffl0Q7

5 U

10 U

1D U

10 u

10 u

5 U

5 U

5 U

LMH8C

2Q6'2009

5 U

10 U

1D U

10 u

10 u

5 U

6 U

5 U

LM-05C

1216/20®

5 U

10 U

10 U

10 u

10 u

a U

5 U

5 U

LM-DSC

S^^DSO

5 U

10 U

1D U

10 u

10 u

o U

5 U

5 U

LM-OSC

6/20V2D11

5 U

10 U

1D U

10 u

10 u

5 U

5 U

5 U

LM-DSC

i113/20 "2

5 U

10 U

ID U

10 u

10 u

5 U

5 U

5 U

LMGSC

11/30:2012

5 U

10 U

ID U

10 u

10 u

5 U

5 U

5 U

LM-DSC:

5'?a«)13

5 U

10 U

10 U

10 u

10 u

5 U

5 U

5 U

LM-OSC

5/21/2054

5 U

10 U

10 u

10 u

10 u

5 U

5 U

5 U

UVWJSC

3/1E/2Q15

5 U

10 u

1D U

10 u

10 u

a U

5 U

5 U

LM-DSC

12/21/2015

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

LM-Q8C

W27.'2Df6

5 U

10 u

ID U

10 u

10 u

5 U

5 U

5 U

LM-OBC

5/3.2017

5 U

10 u

ID U

10 u

10 u

5 U

5 U

5 U

LM-OSC

i^QOIS

5 U

10 u

ID U

10 u

10 u

5 U

5 U

5 U

LM-OSC

12/13/2018

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

LM-Q8C

12/U2Q2D

5 U

0.9 U

NA

D.2 U

5 U

5 U

5 U

5 U

LM-OSC

12/7/2022

5 U

9.a u

NA

D.2 U

4.9 U

5 U

5 U

5 U





















LM-05C DUP

SOS201Q

5 U

10 u

10 U

?o u

10 u

5 U

5 U

5 U





















LM-09E

1'10/1&39

1,900

5.1C0

47

5 U

43

1,53]

SO U

1,100

K-14

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goaf:

Benze*ve

naphthalene

2,4-Dimetfiyl phenol

Benzoi'a)pyrene

Carbazole

Efoyibenzeive

Toluene

Total Xylenes

5

1,500

700

02

5

700

1,000

10,000

Wei?

Date Sampled

















LM-09B

11-10.-2OOD

2,000

710 J

10 UJ

10 UJ

71 J

1,100

100 u

6®)

LM-G9B

10/222001

3.000

3,200

10 U

10 U

46

1.700

22

750

LW-D9B

42&2DQ5

1,003

2.2CC

61

10 U

£2

SCO

50 U

260

lm-o§e

ft'142005

80

1200

26

10 U

33

79

51

166

LM430B

11/&2005

S3

550

13

10 U

130

130

6

137

UM-O&E

1/102£06

36 J

420

23

10 U

39

50

6 J

40 J

LM-09E

2/23,12006

56

110

10 U

10 U

41

120

5 U

36

LM-DdE

&''14<2D06

25

77

10 U

10 U

34

260

12

70

LM-09B

£' 13,2056

56

10 U

12 R

10 U

80

150

17

133

LM-09E

!2'1,<2M6

100

5 400

10 U

10 U

27

<50

10

40

lM-OSE

3/160007

5 U

33

10 U

10 U

16

13

5 U

5- U

LM-09E

Bte/2007

5 U

10 U

ID U

10 U

to U

5 U

5 U

5 U

LM-D0B

6f 1910003

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

LM-096

2260009

5,6

81

10 U

10 u

10 U

10

5 U

0

LM-05B

12/17/2009

5.0 U

79

10 U

10 u

10 U

15

5 U

5 U

LM-09E

S,23"2010

53

110

1D U

10 u

10 U

10

5 U

3

LM-02B

&2Q2011

14

230

10 UJ

10 u

10 UJ

20

5 U

15

LM-06B

1' 112012

11

170

io u

10 u

10 U

20

5 U

7.3

JJA0E6

11.30.2012

5 U

42

io u

10 u

10 U

5 U

5 U

5 U

LWJSB

»1ffl2Q13

25

360

10 u

10 u

10 IJ

9

5 U

7

LVK38B

5E1Q0J4

5 U

12

10 u

10 u

10 U

5 U

5 U

5 U

LM-096

3*r1&20!5

5 U

10 U

10 u

10 u

10 U

6 U

5 U

5 U

LM-O0C

1221;2015

5 U

17

1D U

10 u

10 U

5 U

5 U

5 U

LM-09B

ft<27QQ16

5 U

15

ID U

10 u

10 U

5 U

5 U

5 U





















LM-10E

l'1Gr1999

5 U

10

5 U

5 U

5 U

43

5 U

22 .

LM-'CS

1 022200 1

5 U

10 U



IO u

10 U

110

5 U

43

LM-tGB

4/2612005

5 U

10 U

10 u

10 u

10 U

66

5 U

33

LM-liGB

2/23.'23:€

5 U

10 U

10 u

10 u

10 U

46

5 U

24

11A-10B

3/1&2Q07

5 U

10 U

10 u

10 u

10 u

52

5 U

25





















LM-10D

31/9/2005

5 U

10 U

10 u

10 u

10 u

5 U

5 U

5 U

LM-1QO

3/142035

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

LM-1QD

12/162005

5 U

10 u

ID U

10 u

10 u

5 U

5 U

6 U

LM-1ZD

2/21200?'

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

LM-1QD

6/14,2036

5 U

10 u

ID U

10 u

10 u

5 U

5 U

5 U

LM-10D

3.1&2007

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U





















MM-01E

1/1S/19&4

3,630

890

1SD

1J

31

250

560

290

MM-D1B

12/3/10®

*6,000

2,600

9.00 U

3

610

1,500

620

T ,600

MM-Q1B

11.' 1&2000

11,000

11 000

430

50 U

320

rooo

2,600

1.680

MM-01B

1Q/17.2001

10,000

530

10 U

10 u

10 U

1 500

1.700

1.700

MM-01B

12/42001

10,000 J

e.ico

190

10 u

190

2.100

2900

2,500





















MM-G1D

', 17,' 19£4

4,500

30

10 U

10 u

10 u

1.000 u

1 ODO U

1,000 U

MM-01D

120/1008

12,003

too

10 U

0.30 U

5 U

1200

19

350

MM-01D

10.'172001

12.001'

67

10 U

10 u

10 U

1 5C0

ICO U

240

K-15

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzefve

Naphthalene

2,4-Oime

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleaniip Goal:

Benzene

N-aphthalefle

24-Dimethylplieno^

Benzoi'ajpyrene

Carbazole

Bthyflwnzene

Toluene

Toial Xylenes

5

1.5&G

700

0.2

5

700

1,000

10,000

Well

Date Sampled

















MM-Q2D

9/27,2016

23,400

4.570

10 U

10 U

10 u

93 J

42

78

MM-02D

6/772017

17,300

5,060

10 U

10 u

10 U

58 U

73 J

EO J

MM-Q2D

3222018

26,000

5.060

10 U

10 u

10 U

123 J

53 U

73 U

MM-02D

12/13/2016

30,1 DO

5.520

10 U

10 u

10 U

76 J

45 U

140 J

MM-Q2D

12/12/2016

24,203

3430

MA

0.2 UJ

5 UJ

52 U

as U

73 U

MM-Q2D

12/2I2D20

22,103

t.150

MA

02 U

4.9 U

67.3 J

45 UJ

85.9 J

MM-02D

11'30.2021

20,203

3.950

MA

0.2 U

5 U

43.5 J

45 UJ

78 UJ

MM-02D

127/2022

15,800

4.590

MA

0.19 U

4.8 U

48.2 J

45 UJ

78 UJ





















MM-Q2D DUP

6/21/2011

23,003 J

4.000

10 UJ

10 u

10 UJ

33 U J

2i3 UJ

21 U

MM-02D DUP

3/15/2012

11,003

2 300

10 U

10 U

10 U

17 UJ

13 UJ

43 J

MM-Q2D DUP

5/22*2014

27,003

3,700

10 U

10 u

10 U

73 J

38 JS

120 J|

MM-Q2D DUP

3/192015

24,903

-£.650

10 U

10 U

10 U

58

to

£2

MM-Q2D DUP

1222=2015

20,003

3.360

10 U

10 U

10 U

63 J

21 UJ

126 J





















MM-12B

11/15/2000

1,803

10 U

10 U

10 U

10 U

65

50 U

50 U

MM-12B

10.102001

753

!50

10 U

10 u

10 U

44

10 U

51

MM-12B

4/2WZJQ5

630

330 R

10 UR

10 UR

10 UR

50 U

50 U

50 U

MM-12B

2/24,0006

620

310

10 U

10 U

10 U

55

5 U

41

MM-12B

¦a'i2/?:-:r]

603

310

10 UR

10 U

10 U

62

5 U

42

MM-12B

3*15/2007

360

440

10 U

10 u

10 U

50 U

50 U

50 U

rvW»f-12E

9'10.2037

503

420

10 U

10 u

10 U

47

5 U

23

MM-12B

6/18/2008

640

340

10 U

10 u

10 U

51

5 UJ

27

MM-12B

3/3/2006

683

340

10 U

10 u

10 U

67

5 U

41

MM-12B

12/17.2009

760

39

10 U

10 u

10 U

51

5 UJ

26

MM-12B

3/142010

530

25

10 U

so u

10 u

54

5 U

27

MM-12B

6/20/2011

200

33

10 U

10 u

10 u

47

5 U

25

MM-12B

3/14/2012

70

14

10 u

10 u

10 u

40

5 U

21

MM-12B

11 >29/2012

123

13

10 u

10 u

10 u

52

5 U

21

MM-12B

3/12/2013

490

36

10 u

10 u

10 u

5c

5 U

25

MM-12B

5/22/2014

500

23

10 u

10 u

10 U

57

5 U

47

MM-12E

3/17/2015

491

11

10 u

10 u

10 u

52

5 U

18

MM-12E

12.18.-2015

392

10 U

10 u

10 u

10 u

56

5 U

14

MM-12B

9,262016

339

10 U

10 u

10 u

10 u

63

5 U

10

MM-12B

§'7.2017

447

10 U

10 u

10 u

10 u

67

5 U

13

MM-12B

1222018

507

10 U

10 u

10 u

10 U

53

5 U

10 J

MM-12B

12/12/2018

160

10 U

10 u

10 u

10 U

60

5 U

7

MM-12B

12.11.2019

392 J

11 U

MA

02 UJ

5 UJ

87.3 J

5 UJ

0.8 J

MM-12E

12/1/2020

'502

9.0 U

MA

0.19 U

4.3 U

50

5 U

5.8

MM-12B

11-202021

946

11 U

MA

0 .22 U

5.5 U

39.4

5 U

5 U

MM-12B

12612022

122

10 U

MA

0.2 U

5 U

30.6

5 U

5 U





















MM-13B

10222001

26

10 U

10 u

10 U

10 U

5 U

5 U

19





















MM-13C

10.222001

56,003

4.600

35

10 U

10 U

3.700

890

1870

MM-13C

12*5/203*

43,003 J

5.500

47

10 u

10

6,000

1,600

3.603

MM-13C

5.22005

33,003

7300

10 U

10 u

10 U

2 700

500 U

1:340

K-17

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goa5:

Benzene

fiiaphthaJesw

2,4-Dimethylpftenol

Benzoi'a)pyrene

Carbazole

Ethylbenze^te

Toluene

Total Xylenes

5

1.50-0

700

Q2

5

700

1,000

10.000

Well

Date Sampied

















MM-13C

2222006

34,000 J

4,400 J

10 U

10 U

14

3,100 J

550

1.550 J

MM-13C

9/12/2006

45,ODD

4.100

50 U

50 U

50 U

3,800

Z50O U

2,500 U

MM-13C

1'162007

56,000

4.800

10 U

10 U

10 U

3,100

470

5,520

MM-13C

9"1Q2DQ7

8,600

4.100

14 J

10 U

10 U

2 900

870

3200

MM-13C

e/ra^DQB

36,000

3.600

10 U

10 U

10 U

2,500

19 UJ

830

MM-13C

3/312006

39.DDC-

5500

220 UJ

37 UJ

350 UJ

3.100

500 U

1300

MM-13C

12?' 15-2009

29,000

3,500

10 U

10 U

10 U

2.600

350

1,060

MM-13C

5,23/2010

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

MM-13C

60110011

31,000

4.300

1B J

10 U

10 UJ

2.900

25 UJ

750

WIM-13C

£15(2012

16,000

3,300

120

10 U

10 U

1,100

170 J

439

MM-13C

11.29,2012

23,000

4.500

10 UJ

10 UJ

10 UJ

4.-000

330

1.170

MM-13C

ana20i3

39,000

3,300

10 UJ

10 UJ

12 J

32-00

310

1.040

MM-13C

5/222014

34,000

3,900

10 U

10 u

10 U

3.200

330 J

ijooa j

MM-13C

3/19,2015

1,540

3 430

10 U

10 u

10 U

146

13

52

MM-13C

12.222015

33,000

3.500

10 U

10 u

10 U

3,140

270 J

1070

MM-13C

927,2016

25,500

3.610

10 U

10 u

10 U

2,650

203 J

755 J

MM-13C

6,720 17

16,300

4,5fi]

10 U

10 u

10 u

1.860

m J

678 J

MM-13C

1*222015

26,400

2.760

10 U

10 u

10 u

2.7M

m j

704 J

MM-13C

12/12/201B

29,000

4.570

10 U

10 u

10 u

3.30Q

234 J

924 J

MM-13C

12/11.-2019

28,400 J

2.430

NA

02 U

7.1

2.750 J

m j

697 J

MM-13C

12/1/2020

17,900

763

NA

02 U

7.3

1,770

136 J

502 J

MM-13C

11.202021

22,400

2,990

NA-

02 U

6.9

2410

177 J

640 J

MM-13C

12/7/2022

17,300

32C0

NA

0.2 U

4.9 U

1.870

110 J

442 J





















MM-13D

10/ 13/2001

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

MM-13D

5-2/2005

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

MM-13D

2222DQ6

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

MM-13D

3/16(2007

5 U

10 U

10 U

10 U

10 u

5 U

5 U

5 U





















MM-14C

10-17-2001

5,400

6.700

220

10 u

ISO

660

33

550

MM-14C

4/28/2035

18

33

10 U

10 u

10 u

12

5 U

5 U

MW-14C

2/27/2000

6

24

10 U

10 u

10 u

7

5 U

g U

WIM-14C

9r13,2DQ6

10

10 U

10 UR

10 u

10 u

10

5 U

6 U

MM-14C

2,'162007

5

27

10 U

10 u

10 u

5

5 U

5 U

MM-14C

9/100007

6

33

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

6/192008

45

30

10 U

10 u

10 u

a u

5 U

5 U

MM-14G

2/262009

5 U

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

12' 17-2009

7

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

5/19.2010

52

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

6.23,2011

130

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

3/152012

96

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

11/29.2012

300

10 U

10 u

10 u

10 u

5 U

5 U

6 U

MM-14C

2/10/2013

46

10 U

1D U

10 u

10 u

5 U

5 U

5 U

MM-14C

5,21,2014

7.5

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

3/17/2015

5 U

10 U

10 U

10 u

10 u

5 U

5 U

5 U

MM-14C

12MG.-2015

5 U

10 u

10 u

10 u

10 u

5 U

a U

0 U

MM-14C

'3262016

5 U

10 u

1D U

10 u

10 u

5 U

5 U

5 U

K-18

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup GoaS:

Benzene

Itaphthatese

2,4-0ime
-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzene

Naphthalene

2,4-Dimethyl phenol

Benzo{a)pyrene

Carbazole

Ethylberizene

Toluene

Total Xylenes

5

1,500

700

0.2

5

700

1,000

10,000

Well

Date Sampled

















MM-16D

12.7/2022

5 U

10 U

NA

0.2 U

5 U

5 U

5 U

5 U





















MM-16D DUP

9/2S/20 IB

40

10 u

94

10 U

10 U

5 U

5 U

18

MM-16D DUP

6/6/2017

28

10 u

69

10 U

10 U

5 U

5 U

17

MM-16D DUP

3/21/2018

16

10 U

27

10 U

10 U

5 U

5 U

11

MM-16D DUP

12/13/2018

15

10 u

30

10 U

10 U

5 U

5 U

11

MM-16D DUP

12/12/2019

5 UJ

11 u

MA

02 UJ

5 UJ

5 UJ

5 UJ

6 .4 J

MM-16D DUP

12/2/2020

8.8

9.9 U

NA

0.2 UJ

5 U

5 U

5 U

7.8

MM-16D DUP

11/30/2021

5.0 U

10.0 U

NA

0.2 U

5 U

5 U

5 U

5.0 U

MM-16D DUP

12/7/2022

5 U

9.7 U

NA

0.19 U

4.8 U

5 U

5 U

5 U





















NM-06D

11/15/2000

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

NM-06D

10/24/2001

5 U

10 U

1D U

10 U

10 U

5 U

5 U

5 U

MM-06D

4/27/20D5

5 U

10 U

1D U

10 U

10 U

5 U

5 U

5 U

NM-Q6D

2/23/2006

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

NM-06D

3/16/2007

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

NM-06D

2/2)6/2009

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

NM-06D

12/16/2009

5 U

10 u

10 U

10 U

10 U

5 U

5 U

5 U

NM-G6D

8/19/2010

5 U

ID U

10 U

10 U

10 U

5 U

5 U

5 U

NM-06D

6/20/2011

5 U

10 U

1D U

10 u

10 U

5 U

5 U

5 U

NM-08D

3/13/2012

5 U

10 U

10 U

10 u

10 U

5 U

5 U

5 U

NM-06D

11/30/2012

5 U

10 u

10 U

10 u

10 U

5 U

5 U

5 U

NM-06D

9/17/2013

5 U

10 u

10 IJ

10 u

10 U

5 U

5 U

5 U

NM-Q6D

5/21/2014

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

NM-Q6D

3/18/2015

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

NM-06D

12/21/2015

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

NM-06D

9/27/2016

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

NM-06D

6/B/2017

5 U

10 u

1D U

10 u

10 u

5 U

5 U

5 U

NM-06D

3/22/2018

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

NM-06D

12/13/2018

5 U

10 u

10 U

10 u

10 u

5 U

5 U

5 U

NM-06D

12/1/2020

5 U

10 u

NA

0.2 U

5 U

5 U

5 U

5 U

NM-06D

12/7/2022

5 U

9.9 U

NA

0.2 U

5 U

5 U

5 U

5 U





















NM-G6D DUP

10/24/2001

5 U

10 u

10 U

10 u

10 U

5 U

5 U

5 U





















PAMW-02

11/13/2000

4.200

10 u

10 u

10 u

10 U

500 U

500 U

500 U

PAMW-02

10/16/2001

2,600

10 u

10 u

10 u

10 U

7

5 U

22

PAMW-02

5/2/2005

4,600

13 U

ID U

10 u

10 U

23

7

28

PAMW-02

9/13/2005

4,700 J

11

1D U

10 u

10 u

50 U

50 U

50 U

PAMW-02

12/16'2005

1,700

10 u

10 U

10 u

10 U

6

5 U

5 U

PAMW-02

2/22/2006

3,300

10 u

10 U

10 u

10 u

17

5 U

18

PAMW-02

6/13/2006

2.800

10 u

10 U

10 u

10 u

10D U

100 U

100 U

PAMW-02

9/12/2D06

18.000

10 u

10 U

10 u

10 u

500 U

500 U

500 U

PAMW-02

11/30/2006

5,200

10 u

10 U

10 u

10 u

500 U

500 U

500 U

PAMW-02

3/20/2007

3.700

10 u

ID U

10 u

10 u

12

5 U

23

PAMW-02

9/11/2007

1,700

10 u

ID U

10 u

10 u

5 U

5 U

7

PAMW-02

6/17/2008

3,800

10 u

1D U

10 u

10 u

5 U

5 U

12

K-20

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzene

Naphthalene

2,4-Dimethyl phenol

Benzo(a)pyrene

Carbazole

Ethylbenzene

Toluene

Total Xylenes

5

1.500

700

0.2

5

700

1,000

10,000

Well

Date Sampled

















PAMW-02

3*/3/2009

4,700

10 U

10 U

10 U

10 U

50 U

50 U

50 U

PAMW-02

8/19/2010

1200

10 U

10 U

10 U

10 U

5 U

5 U

5 U

PAMW-02

6/21/2011

340

10 U

10 U

10 U

10 U

5 U

5 U

6

PAMW-02

3/5/2012

130

10 U

10 U

10 U

10 U

5 U

5 U

5 U

PAMW-02

12/3/2012

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

PAMW-02

9/17/2013

5 U

10 u

10 u

10 U

10 U

5 U

5 U

5 U

PAMW-02

5/21/2014

5 U

10 u

10 u

10 U

10 u

5 U

5 U

5 U

PAMW-02

3/17/2015

52

10 u

10 u

10 U

10 u

5 U

5 U

5 U

PAMW-02

12/18/2015

63

10 u

10 u

10 U

10 u

5 U

5 U

5 U

PAMW-02

9/26/2016

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

PAMW-02

6/6/2017

5 U

10 u

10 u

10 u

10 u

5 U

5 U

5 U

PAMW-02

3/21/2018

906

10 u

10 u

10 u

10 u

5 U

5 U

5 U

PAMW-02

12/12/2016

174

10 u

10 u

10 u

10 u

5 U

5 U

5 U

PAMW-02

12/11/2019

43.1

10 u

NA

0.2 U

5 U

5 U

5 U

5 U

PAMW-02

12/1/2020

5 U

10 u

NA

0.2 U

5 U

5 U

5 U

5 U

PAMW-02

11/29/2021

6.1

10 u

NA

0.2 U

5 U

5 U

5 U

5 U

PAMW-02

12/6(2022

8.7

9.9 U

NA

0.2 U

4.9 U

5 IJ

5 U

5 U





















PAMW-02 DUP

9/13/20DS

1,300 J

12

10 U

10 U

10 u

18

5 U

20





















PAMW-03

11/13/2000

290

10 u

10 U

10 U

10 u

50 U

50 U

50 U





















PM-01 C

10/11/2001

1200

160

10 U

10 u

10 u

150

9

110

PM-01C

5/2/2005

1,800

59 U

10 U

10 u

10 u

160

5 U

33

PM-01C

9/13/2005

2,000

210

10 U

10 u

10 u







PM-01 C

12'16/2005

1,000

190

10 U

10 u

10 u

150

8

30

PM-01C

2/22/2006

1,100

91

10 U

10 u

10 u

170

5 U

33

PM-01C

6/13/2006

1.200

61

10 U

10 u

10 u

160

5 U

9

PM-01C

9/12/2006

1,100

23 R

10 UR

10 UR

10 UR

130

5 U

17

PM-01 C

11/30/2006

910

97

10 U

10 u

10 u

98

50 U

50 U

PM-01 C

3/20/2007

1,100

250

10 u

10 u

10 u

170

6

35

PM-01 C

9/11/2007

1,000

88

10 u

10 u

10 u

120

100 U

100 U

PM-01 C

6/17/2008

1,700

110

10 u

10 u

10 u

130

5 U

20

PM-01 C

3/3/2009

200

54

10 u

10 u

10 u

8.0

5 U

5 U

PM-01 C

6/19/2010

2,800

37

10 u

10 u

10 u

41.0

5 U

16

PM-01 C

6/21/2011

2,600

27

10 u

10 u

10 u

5 UJ

5 UJ

5 UJ

PM-OtC

3/5/2012

53

12

10 u

10 u

10 u

5 U

5 U

5 U

PM-01 C

12/3/2012

2,600

10

10 u

10 u

10 u

13 J

5 UJ

12 J

PM-01 C

9/17/2013

2,500

13

10 u

10 u

10 u

13 J

5 UJ

14 J

PM-01 C

5/21/2014

1,900

10 U

10 u

10 u

10 u

6.3 J

5 UJ

11 J

PM-01 C

3/17/2015

1,510

10 u

10 UJ

10 u

10 UJ

5.6

5 U

13

PM-01 C

12/16/2015

1,210

10 u

10 u

10 u

10 u

5 U

5 U

10 J

PM-01 C

9/26/2016

947

11

10 u

10 u

10

5 U

5 U

8 J

PM-01 C

616/2017

761

10 u

10 u

10 u

10 u

5 U

5 U

11 J

PM-01 C

3/21/2018

587

10 u

10 u

10 u

10 u

5 U

5 U

7 J

PM-01 C

12/12/2018

557

10 u

10 u

10 u

10 u

5 U

5 U

10

PM-01 C

12/11/2019

440 J

11 u

NA

02 LI J

5 UJ

5 UJ

5 UJ

10 UJ

K-21

-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzene

naphthalene

2.4-Dimethyl phenol

Benzo
-------
Table K-3 Continued: Summary of Historical Intermediate Groundwater Quality Data Based on ROD Constituent List from September 2022



Cleanup Goal:

Benzene

Naphthalene

2,4-Dimethylphenol

Benzo(a)pyfene

Carbazole

Ethylfoenzene

Toluene

Total Xylenes

5

1.500

700

0,2

5

700

1.000

10,000

Well

Dale Sampled

















TBD30812

3/8/2012

5 U









5 U

5 U

5 U

TB031412

3/14/2012

5 U









5 U

5 U

5 U

TB031512

3/15/2012

5 U









5 U

5 U

5 U

TB112912

1109/2012

5 U









5 U

5 U

5 U

TB12Q312

12/3/2012

5 U









5 U

5 U

5 U

TB091713

9/17/2013

5 U









5 U

5 U

5 U

TB091913

9/19/2013

5 U









5 U

5 U

5 U

TB052014

5/20/2014

5 U









5 U

5 U

5 U

TB052214

5/22/2014

5 U









5 U

5 U

5 U

TB03172D15

3/17/2015

5 U









5 U

5 U

5 U

TB03192D15

3/19/2015

5 U









5 U

5 U

5 U

TB12182015

12/1B/2015

5 U









5 U

5 U

5 U

TB12212015

12/21/2015

5 U









5 U

5 U

5 U

TB092616

9/28/2018

5 U









5 U

5 U

5 U

TB 092816

9/28/2016

5 U









5 U

5 U

5 U

TB06062D17

6/6/20T7

5 U









5 U

5 U

5 U

TB032118

3/21/2018

5 U









5 U

5 U

5 U

TB121218

12/12/2018

5 U









5 U

5 U

5 U

TBI 21219

12/12/2019

5 U









5 U

5 U

5 U

TBI20120

12/1/2020

5 U









5 U

5 U

5 U

TRIP BLANK

11/29/2021

5 (J









5 U

5 U

5 U

TRIP BLANK

12^6/2022

5 U









5 U

5 U

5 U





















USGS-01

1/13/1994

3 J

3 J

10 U

10 U

10 U

10 U

10 U

6 J





















USGS-02D

1/13/1994

10 U

5 J

10 U

10 U

10 U

10 U

10 U

10 U

USGS-Q2D

12/2/1998

5 U

25 U

25 U

0.75 U

12 U

5 U

5 U

5 U

USGS-02D

11/15/2000

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 u

USGS-02D

10/23/2001

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U





















USGS-03

1/7/1994

50 U

10 U

10 UJ

10 U

10 U

50 U

50 U

50 U

USGS-03

12/2/1998

5 U

10 U

9.80 U

0.29 U

4.90 U

5 U

5 U

5 U

USGS-03

11/15/2D0D

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

USGS-03

10/23/2001

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U





















USGS-03 DUP

10/23/2001

5 U

10 U

10 U

10 U

10 U

5 U

5 U

5 U

Note:

N.A - Not available

K-23

-------
Figure K-5: Apparent DNAPL Thickness - Intermediate Sand Units (December 2019)

K-24

-------
NOT MEASURED

DNAPL ACCUMULATION

SCSPA

ELECTRICAL

SUBSTATION

TRUCK ACCESS ROUTE

BM-04D

(TRACE)

NOTE:

SEE TABLE 3 FOR DATES OF DNAPL THICKNESS MEASUREMENTS.

CONTROL BUILDING

I ARTESIAN WELL

-------
Figure K-7: Apparent DNAPL Thickness -Intermediate Sand Units (November 2021)

K-26

-------
Figure K-8: Apparent DNAPL Thickness - Intermediate Sand Units (December 2022)

K-27

-------
APPENDIX L - DNAPL DATA

L-l

-------
Table L-l:Cumulative Total of DNAPL Recovered

Time Period

Duration
(months)

Gallons
Recovered111

Reporting Period

Average Per
fvlosilh (galions)

October 1998 - February 28, 2001

28

1,320

47,1

March 1, 2001 - February 28, 2002

12

683

56.9

March 1, 2002 - August 30. 2002

6

2.356

392.5

September 1, 2002 - November 30. 2002

3

1,328

441.7

December 1, 2002 - May 31. 2003

6

1.884

314.0

June 1, 2003 - November 30, 2003

6

2,415

402,5

December 1, 2003 - May 31, 2004

6

1,329

321.5

June 1, 2004 - November 30, 2004

6

2,018

338.3

December 1, 2004 - May 31, 2005

6

1.334

222,4

June 1. 2005 - November 30. 2005

6

1,725

288.7

December 1. 2005 - May 31, 2008

6

1,345

224.1

June 1, 2006 - November 30, 2006

6

1.309

218.1

December 1, 2008 - May 31, 2007

6

986

161.0

June 1, 200? - November 30, 2007

6

1.025

170.8

December 1, 2007 - May 31, 2008

6

653

108.8

June 1, 2008 - November 30, 2008

6

844

107,4

December 1, 2008 - May 31, 2009

6

465

77.6

June 1, 2009 - November 30, 2009

6

800

100.1

December 1, 2009 - May 31, 2010

6

418

89.7

June 1, 2010 - November 30. 2010

8

540

90.0

December 1, 2010 - May 31, 2011

6

396

86.0

June 1, 2011 - November 30, 2011

6

486

80.9

December 1. 2011 - May 31. 2012

6

403

87,2

June 1, 2012 - November 30, 2012

6

512

85.4

December 1, 2012 - May 31, 2013

6

413

88.9

June 1, 2013 - November 30,, 2013

6

813

102,1

December 1, 2013 - May 31. 2014

6

1,020

170.0

June 1. 2014 - November 30, 2014

6

1,200

200,0

December 1, 2014 - May 31, 2015

6

1,252

208,7

June 1, 2015 - November 30, 2015

6

1.242

207.0

December 1, 2015 - May 31, 2018

6

1.135

189.1

June 1, 2018 - November 30, 2018

6

1,209

201,5

December 1. 2018- May 31, 2017

6

1,204

200.8

June 1, 2017 - November 30, 2017

6

1.238

208.4

December 1, 2017 - May 31, 2018

fi
©

1,088

178,1

June 1, 2018 - November 30, 2018

6

1,146

191.0

December 1, 2018 - May 31, 2019

6

1.121

188.8

June 1, 2019 - November 30, 2019

6

1,283

213.8

December 1, 2019 - May 31, 2020

6

1,407

234.6

June 1, 2020 • November 30, 2020

6

1.482

247.0

December 1, 2020 - May 31, 2021

6

1,259

209.9

June 1, 2021 - November 30, 2021

6

1,591

265.2

December 1, 2021 - May 31, 2022

6

1,374

229,0

June 1 , 2022 - November 30. 2022

6

1,495

249.2

December 1 , 2023 - May 31, 2023

6

1,808

288.0

Total



52,113



Notes:

i! I (iMm-,	.hp hast-l on volume ri",ivure<* hi	>mm! tn slotf* DNftf'L inmriii i«nnw>i opL'ratiriiiE.

L-2

-------
Table L-2: Summary of DNAPL Shipments from January 2000 to May

Drum Shipment Dates and Locations

Number of Drums

ONYX Environmental Services:

January 27, 2000

24

January 24, 2002

13

May 13, 2002

15

Juiy 12, 2002

13

September 9, 2002

18

October 28, 2002

16

November 9, 2002

18

January 16, 2003

12

May 1, 2003

23

July 28, 2003

23

October 16. 2003

19

November 18, 2003

25

February 26, 2004

19

June 16, 2004

16

November 9, 2004

30

March 14, 2005

21

June 21, 2005

14

September 28, 2005

26

November 7, 2005

24

Total:

369

Pollution Control Industries (PCI)

April 6, 2006

22

November 14, 2006

14

February 8, 2007

21

January 24, 2008

30

February 24, 2009

18

March 3, 2009

6

Total:

111

TRADEBE (PCI was acquired by Tradebe)

July 20, 2010

21

January 25,2011

11

December 9, 2011

12

Octobers, 2012

11

August 2, 2013

12

March 11, 2014

16

July 3, 2014

13

December 3, 2014

19

April 27, 2015

14

September 1, 2015

19

January 26, 2018

15

May 31, 2016

16

November 1, 2016

21

April 25, 2017

20

October 9, 2017

18

March 26, 2013

18

September 18, 2018

19

February 15, 2019

20

August 20, 2019

18

April 21, 2020

16

August 12, 2020

18

January 7, 2021

18

June 9, 2021

18

Total:

383

Giant Resource Recovery-Sumter, Inc.

March 8, 2022

45

October 11, 2022

30

January 24, 2023

18

Total:

93

Total Number of Drums:

956

L-3

-------
Table L-3: Apparent DNAPL Thickness Monitoring Schedule

Well

Monitoring
Frequency





DRW-06

Weekly

MM-02B

Weekly



CM-03A

Monthly

MW-12A

Monthly



DRW-52C

Quarterly

DRW-53C

Quarterly

MM-01B

Quarterly

MM-11A

Quarterly

DRW-48

Quarterly

DRW-51

Quarterly



A3-T3

Semi-annual

DRW-02

Semi-annual

DRW-08 and 09

Semi-annual

DRW-12 thru DRW-42

Semi-annual

DRW-45 thru DRW-47

Semi-annual

DRW-49 and 50

Semi-annual

MZ-55A

Semi-annual



DRW-07

Annual

DRW-10

Annual

DRW-11

Annual

LM-10AR

Annual

MM-03A

Annual

MM-15C

Annual

MRW-03

Annual

MRW-04

Annual

MRW-05

Annual

MRW-06

Annual

MZ-06M

Annual

MZ-06U

Annual

ORC-7

Annual

PM-02A

Annual



Shallow Monitoring Wells

Annual

Intermediate Monitoring Wells

Annual

Notes:

(1)	Includes shallow monitoring wells in the current annual groundwater monitoring program.
The next shallow groundwater monitoring event is planned in Second Quarter 2024.

(2)	Includes intermediate monitoring wells in the current annual groundwater monitoring program.
The next intermediate groundwater monitoring event is planned in Fourth Quarter 2023.

(3)	Annual DNAPL monitoring planned in April of each year.

L-4

-------
SEGMENT 2

DATE GALLONS

MAR-02 - NOV-02

857.5

DEC-02 - NOV-03

1.354.5

DEC-03 - NOV-04

1,056.8

DEC-04 - NOV-05

1.399.2

DEC-05 - NOV-06

1,247.4

DEC-06 - NOV-07

8450

DEC-07 - NOV-08

555.7

DEC-08 - NOV-09

409.1

DEC-09 - MAY-10

344 4

DEC-1 G - NOV-11

358.3

DEC-11 - NOV-12

307.8

DEC-12 - NOV-13

217.9

DEC-13 - NOV-14

184.1

DEC-14 - NOV-15

142.5

DEC-15 - NOV-16

146.4

DEC-16 - NOV-17

121.9

DEC-17 - NOV-18

101.7

DEC-18 - NOV-19

94.1

DEC-19 - NOV-20

85.3

DEC-20 - NOV-21

101.0

DEC-21 - NOV-22 (2)

75.1

DEC-22 - MAY-23

31.4

TOTAL:

10.037 1

Figure L-l: DNAPL Recovery Volumes by Segments (from 2002 to 2023)

L-5

-------
Figure L-2: DNAPL Recovery Trends with Time

L-6



SEGMENT 4 - DNAPL REMOVAL

400





§350

1

U 300
|





i

§ 200





1

D 150





»





/^^ ^ ^^ ^ ^ ^ ^^^

Ending Reporting Period (Month and Year)



SEGMENT 5 - DNAPL REMOVAL

330





Is0





S 2S0

I

% 100
£

1

of 150





k

§

100





50





/yVV^VVV^VVVVVVV/^VVVV

Ending Reporting Period (Month and Year)

SEGMENT 6 - DNAPL REMOVAL

////// J ^ 1? if ^ 4? ^ ^

Ending Repot ting Period (Month and Year)

DOMINION ENERGY
SOUTH CAROLINA, INC.

DNAPL REMOVAL
TRENDS WITH TIME

CALHOUN PARK AREA SITE
CHARLESTON. SOUTH CAROLINA

DATE: 10/2/2023

FILE NAME: segmentpiotB43

APEX COMPANIES. LLC

-------
1000.0

100.0

Historical Monthy DNAPL Volume Removed

Historical Monthly Apparent DNAPL Thickness

Time (Month and Year)

Figure L-3: DRW-06 Historical Monthly Volume Removed and Apparent DNAPL Thickness

L-7

-------
I I II III II II II llllIHI||| II lul II | I * II ii

^ *fV // #V// c/./ cfV 
-------
3000

Summer Months (June through November)

Winter Months (December through May)

2500

§, 2000

1500

< 1000

500

0

^VVVVV

Ending Reporting Period (Month and Year)

Figure L-5: Total DNAPL Volume Removed During 6-Month Reporting Periods

L-9

-------
Cfl
c
O

ra

0

TJ

1
>
o

£

oc

©

£
3

O
>

a
<

400

300

200

2,003 Gallons Recovered Prior to
March 2002

50,110 Gallons Recovered Since
March 2002 (Based on Drum
Measurements)

52,113 Gallons Recovered Through
May 2023

Note; The increased DNAPL volume
removed from October 2013 through
November 2022 Is attributed to the
increased ONAPL recovery from DRW-06,

DOMINION ENERGY SOUTH CAROLINA tNC

TOTAL ONAPL VOLUME REMOVED BY MONTH
	MARCH 2002 MAY 2023	

CALHOUN PARK AREA SITE
CHARLESTON. SOUTH CAROLINA

APEX CO.\[FAMES.LLC

Ending Month (Month and Year)

Figure L-6: Total DNAPL Volume Removed by Month

L-10

-------
Table L-4: Average Monthly DNAPL Removed Compared to Total Removal Events (June 2002 -

May 2023)

Time Period

Duration
(months)

Total Gallons

Reporting Period
Aveiage Pet Month
(qallons)

Total Removal
Events per period

Metiic,;s

June 1. 2002 - November 30. 2002

6

2.683

447 2

445

1.01

December 1. 2002 - May 31 2008

6

1.884

314 1

281

i '2

June 1. 2003 - November 30. 2003

6

2.415

402.4

334

1.20

December 1. 2003 - May 31. 2004

6

1.928

321 4

369

0 87

June 1. 2004 - November 30. 2004

6

2,018

336.3

424

0.79

December 1 2004 - May 31. 2005

6

1.334

•¦)')*) {4

33''

0 67

June 1. 2005 - November 30, 2005

6

1.725

287.6

447

0.64

December 1. 2005 - May 31. 2006

6

1.345

224.1

571

0 39

June 1. 2006 - November 30. 2006

6

1.309

218.1

460

0.47

December 1. 2006 - May 31. 2007

6

966

i G >

534

0 30

June 1. 2007 - November 30. 2007

6

1.025

170 8

433

0.35

December 1. 2007 - May 3 1. 2008

6

653

100 8

474

0.23

June 1. 2008 - November 30. 2003

6

644

107 4

430

0.25

December 1. 2008 - May 31. 200G

6

465

77.6

486

0 16

June 1. 2009 - November 30. 2009

6

600

100.1

424

0.24

December !. 2009 - May 31 2010

6

418

69 7

395

0. IS

June 1. 2010 - November 30. 2010

6

540

90.0

320

0.28

December 1. 2010 - May 31, 2011

6

396

66 0

317



June 1. 2011 - November .30. 2011

6

486

80.9

302

0 27

December 1 2011 - May 31. 2012

6

403

67 2

317

0.21

June 1. 2012 - November 30. 2012

6

512

85.4

230

0.30

December 1. 2012 - May 31. 2013

6

413

68.9

275



June 1. 2013 - November 30. 2013

6

613

102.1

271

0.38

December 1. 20i3 - "way 31. 2014

6

1.020

170 0

280



June 1 2014 - November 30, 2014

6

1.200

200.0

262

0.76

December 1. 2014 - May 31. 2015

6

1.252

203 7

262

0.80

June 1. 2015 - November 30. 2015

6

1.242

207 0

258

0.80

December 1. 2015 - May 31. 2016

6

1.135

189.1

231

0.82

June 1. 2016 - November 30. 2016

6

1.209

201.5

251

0.80

December 1. 2016 - May 31. 2017

6

1.204

200 6

909

0 90

June 1. 2017 - November 30. 2017

6

1.236

206.4

241

0.86

December 1 2017 - May 31. 2016

6

1.068

176 1

¦ •

o.ao

June 1. 2018 - November 30. 2018

6

1.146

191 0

213

0 90

; 	¦ - ' - ' ' ¦

6

1.121

186 is

233

0.80

June 1. 2019 - November 30. 2019

6

1.283

213.8

234

0.91

¦ ¦ ¦ • .' " .

6

1 407

234.6

214

1.10

June 1, 2020 - November 30. 2020

6

1.482

247.0

243

1.02

December 1. 2020 ¦ May 31. 2021

6

1.259

209 8

216

0 97

June 1. 2021 - November 30, 2021

6

1.591

265 2

232

1.14

December 1. 2021 - May 31. 2022

6

1.374

229 0

217

1.06

June 1. 2022 - November 30. 2022

6

1.495

249.2

232

1.07

December 1. 2022 - May 31. 2023

6

1.608

268 0

203

1.32

Notes:

(1)	Gallons recovered are based on volume measured in drums used to store DNAPL during removal operations and includes all wells.

(2)	Developed to quantify DNAPL removal efficiency. Metric is the reporting period average monthly volume removed divided by the total number
of removal events for tie period,

L-ll

-------
Table L-5: Evaluation and Interpretation of Removal Trends for Trench DNAPL Recovery Wells (Winter periods 2008 - 2023)

Segment

Slope
(gallons/year)

Correlation
Coefficient
(R2)

Cumulative DNAPL
Volume Removed-*1!
(gallons)

Interpretation

Segment 1

0.0

0.00

577.9

Poor R2 suggests data variability during the DNAPL recovery period
evaluated. The trend is essentially flat indicating DNAPL recovery is
asymptotic (i.e., recovery and recharge are essentially equal).

Segment 2

-10.1

0.89

10,037.1

Good R2 suggests DNAPL recovery data has followed a predictable trend.
Thetrend is negative suggesting depletion is occurring at an approximate
rate of 10.1 gallons per year.

Segment 3

-0.2

0.05

1,903.0

Poor R2 suggests data variability during the DNAPL recovery period
evaluated. Thetrend is slightly positive, slope shallow, and indicates DNAPL
recovery is asymptotic (i.e., recovery and recharge are
essentially equal).

Segment 4

-0.4

0.19

2,361.4

Poor R2 suggest data variability during the DNAPL recovery period
evaluated. Thetrend is slightly negative, slope shallow, and indicates DNAPL
recovery is asymptotic (i.e., recovery and recharge are
essentially equal).

Segment 5

-1.9

0.74

3,682.1

Moderate R2 suggests some DNAPL recovery data variability over period
evaluated. Thetrend is negative and suggests depletion is occurring at
an approximate rate of 1.9 gallons per year.

Segment 6

-3.6

0.77

5,516.4

Moderate R2 suggests some DNAPL recovery data variability over period
evaluated. The trend is negative and suggests depletion is occurring at
an approximate rate of 3.6 gallons per year.

L-12

-------
Table L-6: Summary ofApparent DNAPL Thicbiess in Wells and Averages



Apparent DNAPL Thickness (feet)

Change in Apparent DNAPL

Percent Change from



and Dates Measured"'"

Thickness from March 2002

March 2002 to

Well

March 2002

March 13-16, 2023

to March 2023 (feet)

March 2023

DNAPL Recovery Wells



DRW-02(JI

3.65

0.01

-3.64

-100%

DRW-06

2.29

11.00

8.71

380%

DRW-O?™^

0.42

0.18

-0.24

-57%

DRW-08

0.50

0.20

-0.30

-60%

DRW-09(3)H

0.00

0.01

0.01

undefined

DRW-10(3Kb)

0.00

0.00

0.00

no change

DRW-11<3*'

0.00

0.00

0.00

no change

DRW-12

1.42

0.20

-1.22

-86%

DRW-13

1.00

0.31

-0.69

-69%

DRW-14

1.33

0.10

-1.23

-92%

DRW-15

1.67

0.11

-1.56

-93%

DRW-16

0.96

0.15

-0.81

-84%

DRW-17

0.88

0.11

-0.77

-88%

DRW-18

0.21

0.25

0.04

19%

DRW-19

0.17

0.13

-0.04

-24%

DRW-20

3.83

0.14

-3.69

-96%

DRW-21

2.92

0.27

-2.65

-91%

DRW-22

0.46

0.08

-0.38

-83%

DRW-23

0.54

0.10

-0.44

-81%

DRW-24

1.42

0.13

-1.29

-91%

DRW-25

3.08

0.15

-2.93

-95%

DRW-26

2.13

0.15

-1.98

-93%

DRW-27*3'

0.17

0.01

-0.16

-94%

DRW-28

1.25

0.13

-1.12

-90%

DRW-29131

0.30

0.00

-0.30

-100%

DRW-30

1.83

0.08

-1.75

-96%

DRW-31(J)

1.50

0.01

-1.49

-99%

DRW-32

4.67

0.24

-4.43

-95%

DRW-33'3'

2.25

0.01

-2.24

-100%

DRW-34

3.83

0.30

-3.53

-92%

DRW-35

1.75

0.55

-1.20

-69%

DRW-36

1.58

0.20

-1.38

-87%

DRW-37

1.42

0.11

-1.31

-92%

DRW-38

1.75

0.15

-1.60

-91%

DRW-39

1.25

0.12

-1.13

-90%

DRW-40

0.67

0.20

-0.47

-70%

DRW-41

2.50

0.16

-2.34

-94%

DRW-42

1 17

0.28

-0.89

-76%

DRW-45

2.08

0.11

-1.97

-95%

DRW-46

0.92

0.15

-0.77

-84%

DRW-47*3"41

0.00

0.13

0.13

undefined

DRW-48(b)

0.83

0.30

-0 53

-64%

DRW-4913'

0.01

0.00

-0.01

-100%

DRW-50

0.54

0.10

-0.44

-81%

DRW-51,el

0.33

0.30

-0.03

-9%

Average Thickness (feet)

1.37

0.39





Average Change in Apparent DNAPL Thickness (feet):

-0.98



Shallow Monitoring Wells



Apparent DNAPL Thickness (feet)

Change in Apparent DNAPL

Percent Change from



and Dates Measured11^1

Thickness from March 2002

March 2002 to

Well

March 2002

March 13-15, 2023

to September 2022 (feet)

September 2022

A3-T3^>

0.00

0.01

0.01

undefined

CM-03A

0.40

0.81

0.41

103%

MM-11A16'

1.33

1.34

0.01

1%

MW-12A13'

0.01

0.11

0.10

1000%

MZ-06M™

0.85

0.00

-0.85

-100%

MZ-55A

0.35

1.65

1.30

371%

ORC-7'3"4"5'

0.00

0.01

0.01

undefined

Average Thickness (feet)

0.42

0.56





Average Change in Apparent DNAPL Thickness (feet):

0.14



Intermediate Monitoring Wells



Apparent DNAPL Thickness (feet)

Change in Apparent DNAPL

Percent Change from



and Dates Measured11'"

Thickness from March 2002

March 2002 to

Well

March 2002

March 13-15, 2023

to September 2022 (feet)

September 2022

DRW-52C(3K°>

0.01

0.27

0.26

2600%

DRW-53C<3Ke)

0.85

0.01

-0.84

-99%

MM-01B™

3.15

0.15

-3.00

-95%

MM-02B

7.00

2.65

-4.35

-62%

MM-15C<3K5)

0.90

0.01

-0.89

-99%

Average Thickness (feet)

2.38

0.62





Average Change in Apparent DNAPL Thickness (feet):

-1.76



Notes:

(1)	March 2002 data used as a reference point, except for A3-T3, DRW-52C, DRW-53C, ORC-7 and MW-12A DRW-52C and DRW-53C were installed in December 2003 and DNAPL

thickness measured in January 2004 used as reference Wells A3-T3, ORC-7 and MW-12A DNAPL thickness reference is September 2002

(2)	Data obtained from the weekly, monthly, quarterly, semi-annual and annual apparent DNAPL thickness monitonng events for the timeframe indicated The dates listed represent the

timeframe that measurements were obtained, excluding the exceptions below

(3)	A value of 0 01 feet generally indicates trace DNAPL was measured A value of 0 00 feet generally indicates no product was measured

(4)	The reference apparent DNAPL thickness is 0 00 feet and therefore quotient is undefined

(5)	DRW-07, DRW-10, DRW-11, MM-15C. MZ-06M and are measured annually and data is from May 2023.

(6)	DRW-48, DRW-51, DRW-52C. DRW-53C, MM-01B and MM-11A are measured quarterly and data is from January 2023

L-13

-------
Table L-7: DNAPL Volume Removed 6-Month Comparison

RECOVERY WELLS

COMPARISON OF DNAPL VOLUME REMOVED (GALLONS)

Mar-02 - Auq-02

Sep-02 • Nov-02

Dec-02 - May-03

Jun-03 - Nov-03

Dec-03 - May-04

Jun-04 - Nov-04

Dec-04 - May-05

Jun-05 - Nov-05

Dec-05 - May-06

Jun-06 - Nov-06

Dec-06 - May-07

Jun-07 - Nov-07

Total

AvgJ
Month

Total

Avg./
Month

Total

Avg J
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg J
Month

Total

Avg .1
Month

Total

Avg./
Month

Total

Avg./
Month

Well DRW-06

489

82



132

620

103

667

111

649

108

465

77

207

35

212

35

260

43

151

25

199

33

202

34

Recovery Trench Wells DRW-08 through DRW-51

1.845

308

922

307

1,258

210

1,739

290

1.262

210

1,544

257

1,115

186

1.485

247

1,067

178

1.145

191

749

125

806

134

Shallow Monitoring Wells CM-03A, MM-11A MW-
I2A. MZ-06M and MZ-55A

1.91

032

021

0.07

0.85

0 14

0 70

0 12

0.68

0.11

021

004

0.31

0.05

I 47

0 25

0.86

014

024

004

0.70

0.12

0 17

0 03

Intermediate Wells DRW-52C, DRW-53C, MM-01B.
MM-02B and MM- I5C

2018

3.36

-

226

5.47

091

806

1 34

17.59

2.93

9 22

1 54

11.33

1 89

15 10

2 52

14.62

2.44

11 97

200

17 00

2.83

15 64

2 61

Total

2,356

393

1.326

442

1,885

314

2,415

402

1,929

322

2,018

336

1,334

222

1,713

286

1,342

224

1,309

218

965

161

1,024

171



RECOVERY WELLS

COMPARISON OF DNAPL VOLUME REMOVED (GALLONS)

Dec-07 - May-08

Jun-08 - Nov-08

Dec-08 - May-09

Jun-09 - Nov-09

Dec-09 - May-10

Jun-10- Nov-10

Dec-10- May-11

Jun-11 - Nov-1t

Dec-11 - May-12

Jun-12 - Nov-12

Oec-12 - May-13

Jun-13 - Nov-13

Total

Avg./
Month

Total

Avg J
Month

Total

Avg./
Month

Total

Avg J
Month

Total

Avgi
Month

Total

Avg./
Month

Total

Avg J
Month

Total

Avg./
Month

Total

Avg J
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Well DRW 06

88

15

68

11

75

13

90

15

65

11

88

15

66

11

62

10

73

12

87

15

109

18

271

45

Recovery Trench Wells DRW-08 Ihiough DRW-51

551

92

560

93

375

62

497

83

341

57

444

74

321

53

4I3

69

319

53

412

69

296

49

333

5r>

Shallow Monitoring Wells CM-03A, MM-11A MW-
12A, MZ-06M and MZ-55A

0 17

003

1 04

0 17

1.32

0.22

0 22

004

085

014

0 88

0 15

1.05

018

1 16

0 19

1 41

0.24

1 03

0 17

0.43

007

1 43

0 24

Intermediate Wells DRW-52C, DRW-53C, MM-01B.
MM-02B and MM-15C

13.48

2.25

15.47

2.58

14.16

2.36

10.25

1.71

11.32

1 89

7.50

1 25

7 94

1.32

9 73

1 62

9.26

1.54

900

1.50

8 07

1.35

7 78

1.30

Total

653

109

644

107

465

78

597

99

418

70

540

90

396

66

486

81

403

67

510

85

413

69

613

102



RECOVERY WELLS

COMPARISON OF DNAPL VOLUME REMOVED (GALLONS)

Dec-13 - May-14

Jun-14 - Nov-14

Dec-14 - May-15

Jun-15- Nov-15

Dec-15 - May-16

Jun-16 • Nov-16

Dec-16- May-17

Jun-17 • Nov-17

Dec-17 - May-18

Jun-18 - Nov-18

Dec-18-May 19

Jun-19 - Nov-19

Total

Avg J
Month

Total

Avg J
Month

Total

Avgi
Month

Total

Avg ./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg .1
Month

Total

Avg./
Month

Total

Avg J
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Well DRW-06

743

124

890

148

1,010

168

947

158

894

149

895

140

957

160

955

159

845

141

892

149

903

150

1.027

171

Recovery Trench Wells DRW-08 through DRW-51

266

44

300

50

232

39

286

48

232

39

306

51

238

40

270

45

213

35

245

41

206

34

246

41

Shallow Monitoring Wells A3-T3. CM-03A, MM-11 A.
MW 12A, MZ-06M, MZ-55Aand ORC-7'11

2.32

0.39

0.72

0.12

1 03

0.17

0.44

0.07

1.02

0.17

0.50

0.08

0.65

0.11

0.55

0.09

1.50

0.25

0.35

0.06

1 85

0.31

1.00

0.17

Intermediate Wells DRW-52C, DRW-53C, MM-01B
MM-02B and MM-15C

8.33

1.39

7 75

1.29

9.03

1.51

827

1 38

7.59

1.27

8 32

1 39

7.65

1.28

12 25

2 04

9.50

1.58

835

1 39

10.5

175

8 25

14

Total

1,020

170

1,199

200

1,252

209

1,242

207

1,135

189

1,210

202

1,204

201

1,237

206

1,068

178

1.146

191

1,121

187

1,283

214



RECOVERY WELLS

COMPARISON OF DNAPL VOLUME REMOVED (GALLONS)

Dec-19 - May-20

Jun-20 - Nov-20

Dec-20 - May-21

Jun-21 - Nov-21

Dec-21 - May-22

Jun-22 - Nov-22

Dec-22 - May-23











Total

Avg J
Month

Total

AvgJ
Month

Total

Avg J
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Total

Avg./
Month

Well DRW-06

1.210

202

1.241

207

1.075

179

1.368

228

1.210

202

1,316

219

1.474

246





















Recovery Trench Wells DRW-08 through DRW-51

188

31

228

38

173

29

212

35

151

25

168

28

126

21





















Shallow Monitoring Wells A3-T3, CM-03A, MM-11 A.
MW-12A, MZ-06M, MZ-55A and ORC-711'

0.85

014

1 10

0 18

1.15

019

0 70

0 12

1.05

0.18

0 7

0 12

1.05

018





















Intermediate Wells DRW-52C, DRW-53C. MM 01B.
MM-02B and MM I5C

8.25

1.4

11.65

1.94

1020

1.70

10.40

1 73

11.35

1 89

1035

1 73

7.5

1.25





















Total

1,407

235

1,482

247

1,260

210

1,591

265

1,374

229

1,495

249

1,608

268





















Notes:

(1) Shallow monitoring well A3-T3 was added Airing the June 2014 through November 2014 event due to the well being pumped for the first time Pumping has not been performed on ORG 7 due to the limited DNAPL volume in this well

L-14

-------
600.0

500.0

400.0

300.0

200.0

100.0

L



Nov

May

Nov

May

Nov

May

Nov

May

Nov

May

Nov

May

Nov-

May

Nov

May

Nov

May

Nov-

May

Nov-

May

Nov-

May

Nov

May

Nov

May-

Nov-

May-

Nov

May

Nov-

May

Nov

May

Nov

May

Nov

May-

Nov

May



02

03

03

04

04

05

05

0b

06

07

07

08

08

09

09

10

10

11

11

12

12

13

13

14

14

15

15

16

16

17

17

18

18

19

19

20

20

21

21

22

22

23

¦Average Gallons Removed Per Month

447 2

314.1

4024

321.5

336 3

2224

287 6

224.1

2181

1610

170 8

108 8

107 4

77 6

100 1

69,7

900

660

809

672

854

689

102 1

170 0

200 0

208 7

207 0

189 1

2015

200 7

206 3

1780

191 0

1868

213 8

234 5

247 0

209 8

265 2

229 0

249 2

268 0

¦Total Number of Removal Events

445

281

334

369

424

332

447

571

460

534

483

474

430

486

424

394

320

317

302

317

280

275

271

280

262

262

258

231

251

222

241

222

213

233

234

214

243

216

232

217

232

203

Ending Reporting Period (Month and Year)

Figure L-7: Average Monthly Volume Removed and Total Removal Events During 6-Month Reporting Periods

L-15

-------
6

Cn/linn Dr+ inn Dnrinrl /Mnntk inrl Vft«»r\

Figure L-8: Plot of Average DNAPL Manually Removed per Removal Event Versus Time

L-16

-------
2000

1800

25

50

75

100

125

150

175

200

225

250

Time Elapsed (months)

Not*: Includes all wells where DNAPL was removed except gasholder wells (DRW-02, DRW-06, and DRW-07).

Figure L-9: Linear Plot of Volume Removed Versus Time for Winter Months (December through May)

L-17

-------
Table L-8: MW-12A DNAPL Measurements and Pumping Activity

Date

Apparent
DNAPL
Thickness
(feet)

DNAPL
Removed
(gallons)'2*

08/25/92

Well Installed

-

09/04/92

021

0.03

09/28/92

NP'"

NR'"

01/06/00

0 40

0 06

01/07/00

Trace

NR

01/31/00

Trace

NR

02/11/00

Trace

0.05

07/06/00

Trace

NR

07/26/00

Trace

NR

12/12/00

0.06

NR

03/21/01

Trace

NR

03/30/01

ORC Socks Installed



04/16/02

ORC Socks Removec



09/09/02

Trace

NR

11/18/02

0.35

NR

01/07/03

025

NR

03/04/03

0.25

NR

04/08/03

0 17

NR

07/07/03

0.40

NR

09/09/03

040

NR

10/08/03

057

NR

01/12/04

0.80

NR

03/02/04

025

NR

04/06/04

0.16

NR

07/07/04

0.50

NR

10/06/04

Trace

NR

01/11/05

0.90

NR

04/05/05

090

NR

07/08/05

Trace

NR

08/25-30/05*""

0.13

NR

10/07/05

0 30

NR

01/12/06

0.20

NR

04/06/06

006

NR

07/06/06

0.23

NR

10/02/06

0 15

NR

01/10/07

0.46

NR

03/05/07

0.40

NR

04/03/07

0.15

NR

12/06/07

1 86

NR

07/16/08

3.71

060

08/29/08

1.15

0.19

09/03/08

0.24

NR

12/05/08

2 35

0 38

01/12/09

1 62

026

02/06/09

081

NR

03/26/09

1.43

0.23

04/06/09

0 15

NR

05/07/09

0.71

NR

05/15/09

0.8

0 13

06/01/09

0.15

NR

07/01/09

0.72

0.12

07/09/09

0 22

NR

08/06/09

0.60

0.10

09/02/09

0 35

NR

10/05/09

0.49

NR

11/03/09

0.53

NR

12/03/09

0 90

NR

01/06/10

1.43

NR

01/13/10

1.43

0.23

02/05/10

1.05

NR

02/22/10

1.80

0.29

03/04/10

0.36

NR

04/09/10

093

NR

04/12/10

093

0 15

05/24/10

1.10

0 18

06/09/10

0 34

NR

07/19/10

078

NR

08/05/10

0 75

NR

09/02/10

1 58

026

09/16/10

0.81

NR

10/12/10

1.70

0.28

Date

Apparent
DNAPL
Thickness
(feet)

DNAPL
Removed
(gallons)'2*

! 11/15/10

2.10

0.34

12/15/10

0.84

NR

01/07/11

2.15

NR |

01/14/11

2 15

0.35

02/07/11

1.00

NR

03/16/11

2.20

NR

03/22/11

220

0.36

04/07/11

0.88

NR

05/03/11

1 00

0.16

05/24/11

1.08

0.18

06/09/11

1.15

NR

06/10/11

1.15

0.19

07/07/11

0.67

0.11

08/04/11

1.40

NR

08/05/11

1.40

0.23

08/31/11

1 51

025

09/15/11

0.82

NR

| 10/13/11

1.60

NR

11/03/11

236

038

12/08/11

1.25

NR

I 12/21/11

1 25

NR

01/05/12

1.24

NR I

01/12/12

1.24

020

02/15/12

192

NR

02/22/12

1.92

0.31

03/09/12

1.00

NR

04/03/12

1.40

0.23

05/10/12

2.25

NR

05/17/12

2.25

0.37

06/07/12

1 15

NR

07/12/12

1.85

NR

07/18/12

2.02

0 33

08/08/12

1.10

0.18

09/19/12

1.30

NR

09/20/12

1 30

021

10/11/12

0.90

0.15

11/19/12

1.00

NR

11/20/12

1.00

0.16

12/14/12

0 65

NR

01/11/13

1.00

NR

01/31/13

1.03

0.17 !

02/21/13

0.53

NR !

02/21/13

055

009

03/11/13

0 38

NR

04/05/13

066

NR

04/25/13

072

0.12

05/09/13

035

NR

06/04/13

0.88

NR

06/06/13

0.88

0.14

07/10/13

0.60

NR

08/08/13

1.95

0.32

09/18/13

0.90

NR

10/09/13

1.00

NR

10/31/13

1.25

0.20

11/21/13

1.25

0.20

12/19/13

0.55

NR

02/03/14

1.30

NR

02/05/14

1.30

0.21

02/26/14

1.03

NR

03/13/14

065

NR

04/07/14

0.88

NR I

04/09/14

0.88

0.14

05/20/14

0.55

NR

05/21/14

055

009

06/11/14

0 57

0.09

07/17/14

0.51

NR

08/11/14

080

NR

09/17/14

1.30

0.21

10/06/14

0 46

NR

11/19/14

1.22

NR i

12/10/14

1 20

0.20

Date

Apparent
DNAPL
Thickness
(feet)

DNAPL
Removed
(gallons)'2*

01/13/15

0.58

NR

02/05/15

0.73

NR I

02/25/15

0.89

0.15 I

03/31/15

047

NR

04/08/15

0 50

0.08

05/13/15

0 42

NR

06/08/15

0.63

NR

07/01/15

0.65

0.11

07/15/15

0.20

NR !

08/07/15

0.65

NR

09/18/15

1.02

NR I

09/21/15

1.02

0 17 |

10/12/15

0.00

NR

11/19/15

0.81

NR I

I 12/16/15

0.94

0.15

01/26/16

0 62

NR i

02/25/16

0.60

0.10 I

03/29/16

0.45

NR

04/25/16

0.70

NR |

05/16/16

0.75

NR

06/02/16

0.68

NR

07/19/16

0.25

NR I

08/26/16

1 13

NR

08/31/16W

1.20

0 25 I

09/19/16

0.43

NR

l| 10/13/16

0.45

NR

I 11/21/16

0.70

NR

J 12/19/16

0.93

NR i

01/25/17

1.05

NR

02/20/17

1.15

NR

03/28/17

1.35

NR i

03/29/17

1.35

0 25

04/19/17

0.28

NR

05/15/17

0.70

NR

06/23/17

0.75

NR !

07/13/17

0.70

NR I

08/22/17

0.75

NR I

08/30/17

0.85

0.15 I

09/18/17

0 25

NR

10/11/17

0.50

0 10 |

I 10/25/17

0.44

NR |

( 11/16/17

0.55

NR

f 12/12/17

0.55

NR

01/24/18

0.84

NR

02/20/18

0 85

NR I

02/21/18

0.85

0 15 I

03/14/18

0.38

NR t

04/18/18

0.55

NR |

05/14/18

0.60

NR

06/06/18

0 70

0.15 f

06/20/18

0.37

NR

07/13/18

0 35

NR I

08/22/18

0.74

NR i

09/19/18

0.58

NR

10/08/18

0 44

NR |

\ 11/19/18

0.70

NR

,i 12/18/18

0.83

NR

01/29/19

0.85

NR

01/30/19

0.85

0.20 I

02/18/19

0 45

NR I

02/20/19

0.45

0.15

03/11/19

0.33

NR

04/17/19

0.60

0 75 I

05/14/19

0 15

NR I

06/19/19

016

NR i

07/15/19

0.15

NR

08/21/19

0.50

NR

09/16/19

0.30

NR

I 10/23/19

0 84

NR |

( 10/29/19

0.50

0.10

11/19/19

Trace

NR |

Date

Apparent
DNAPL
Thickness
(feet)

DNAPL
Removed
(gallons)'2'

12/19/19

0 15

NR

01/15/20

TRACE

NR I

02/26/20

0.13

NR

03/17/20

0 18

NR

04/06/20

0.20

NR

05/20/20

0.55

NR

06/10/20

040

0 10 !

07/22/20

0 17

NR

08/28/20

0 21

NR

09/22/20

0.14

NR

10/27/20

0 28

NR

11/24/20

0.24

NR i

12/16/20

0.38

NR

01/26/21

0.42

NR

02/03/21

0.50

0.10

02/25/21

Trace

NR

03/17/21

0.11

NR

04/07/21

0.10

NR

05/19/21

0.15

NR

06/30/21

022

NR

07/21/21

0 18

NR !

08/26/21

0.18

NR

09/22/21

0 52

NR

10/29/21

023

NR

11/24/21

0.18

NR

12/15/21

0.40

0.10

01/26/22

0.10

NR I

02/23/22

0.27

NR

03/16/22

0.27

NR

04/27/22

0 62

0.10

05/17/22

Trace

NR l

06/29/22

024

NR

07/18/22

027

NR

08/31/22

0.30

NR I

09/21/22

0.51

0 10

10/26/22

0.13

NR

11/22/22

0 33

NR !

12/14/22

0.57

NR I

01/11/23

0 68

0 15

02/23/23

0 15

NR

03/15/23

0.11

NR

04/05/23

042

0.10 |

05/16/23

0.15

NR I









































































































































































Notes:	Total Gallons Removed: 14.17

(1)	NP - Not Present, NR - Not Removed

(2)	From 1992 to 2000, the volume of DNAPL removed was calculated as a percentage of water and DNAPL pumped from the well.

From July 16, 2008 to August 31, 2016 the DNAPL volume removed is based on the in-well volume derived from the apparent DNAPL thickness measurement
Starting on August 31, 2016, the DNAPL volume removed is based on the estimated bucket volume of DNAPL removed from the well.

(3)	Well rehabilitation period via Fenton's Reagent.

I.-18

-------
APPENDIX M - SITE PHOTOGRAPHS

M-l

-------
PARKING

MTR

'l CHARLOTTE ST.

Site Photograph M-l: DESC 1/2 Charlotte Street Substation Entrance

M-l

-------
Site Photograph M-2: DESC Substation (looking east to west)

Site Photograph M- 3: Middle of DESC Substation (looking from southeast to northwestf

M-2

-------
Site Photograph M-5: DESC Substation (looking from top of parking garage towards the Ports Authority)

Site Photogr*aph M-4: Calhoun Park Area (looking from parking garage east towards the Cooper River)

M-3

-------
Site Photograph M-7Calhoun Park Area (looking from parking garage south towards Gadsdenboro Park)

Site Photograph M-6: Cooper River (looking from Charlotte Street Park Irish Memorial south)

M-4

-------
Site Photograph M-8: DRW-35

M-5

-------
Site Photograph M-9: DRW-33

M-6

-------
Site Photograph M-10: DRW-6 (555th drum)

M-7

-------
M-8

-------
APPENDIX N - INSTITUTIONAL CONTROL INSTRUMENTS

N-l

-------
IIIIIIIIIIIUIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

BP0759782

Upon Recording. Return To:

Attn: Project Manager

Federal Remediation

Bureau of Land and Waste Management

DHEC

2600 Bull Street

Columbia. South Carolina 29201

STATE OF SOUTH CAROLINA	)

) DECLARATION OF COVENANTS
COUNTY OF CHARLESTON	)	AND RESTRICTIONS

THIS DECLARATION OF COVENANTS AND RESTRICTIONS (the
"Declaration") is made and entered into this 1 day	, 2018 (the "Effective Date"),

by SOUTH CAROLINA ELECTRIC & GAS COMPANY (hereinafter referred to as
"SCE&G"), the SOUTH CAROLINA DEPARTMENT OF HEALTH AND
ENVIRONMENTAL CONTROL (hereinafter referred to as the "Department"), and the
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY (hereinafter referred to as
the "EPA"). ,

RECITALS

WHEREAS, SCE&G is the owner of certain real property located at 1 Charlotte Street,
Charleston, Charleston County, South Carolina, with Charleston County Property I.D.
4591304002, containing 3.746 acres, more or less, and as more particularly shown on that certain
Boundary Survey of 1 Charlotte Street, City of Charleston, dated June 11, 2018. and prepared by
Forsberg Engineering and Surveying, Inc. for SCE&G, attached hereto and incorporated herein as
Exhibit A (the "Property"): and

WHEREAS, the Property, as well as other surrounding property generally defined as the
Calhoun Park Area Site (the "CPA Site") as that term is defined herein, has been the subject of a
non-time-critical removal action, subject of and pursuant to the following matters: (i) that certain
Administrative Order on Consent for Removal Action in CERCLA Docket No: 98-16-C dated as
of May 22. 1998 (the "AOC") issued by the EPA under the Comprehensive Environmental
Response Compensation and Liability Act ("CERCLA"), 42 U.S.C. §§ 9601, et seq.; (ii) the
Record of Decision issued by the EPA with EPA ID: SCD987581337/OU 01 on September 30,
1998 (the "ROD"); and (iii) the Unilateral Administrative Order for Remedial Design and
Remedial Action issued by the EPA in U.S. EPA Docket No. 99-08-C on January 13, 1999 (the
"UAO"); and

WHEREAS, SCE&G has completed all required work, including, but not limited to, all
Remedial Design and Remedial Actions required, and in accordance and in compliance with the
AOC, ROD and the UAO as they relate to the Property as well as to the CPA Site, as that term is
defined in the AOC, ROD, and the UAO: and

1

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WHEREAS, at this time, the Property may be used for certain purposes without further
remediation by SCE&G subject to the requirements of this Declaration; and

WHEREAS. SCE&G agrees by the recording of this Declaration to impose certain
restrictions on the manner in which the Property may be developed and utilized: and

WHEREAS, it is the intention of all parties that that the EPA shall be considered a third-
party beneficiary of this Declaration, and that the restrictions contained in this Declaration shall
be enforceable by either the EPA, the Department, or their successor agencies and assigns; and

WHEREAS, the EPA has worked closely with the Department in developing the AOC,
and the EPA will assist the Department in monitoring and enforcing this Declaration.

NOW, THEREFORE, KNOW ALL MEN BY THESE PRESENTS that SCE&G
hereby declares and covenants on behalf of itself, its successors and assigns, and for any successor
in title of the Property, that the Property shown on Exhibit A shall be held, mortgaged, transferred,
sold, conveyed, licensed, leased, occupied, and used subject to the following restrictions, which
shall touch, concern and run with the title to the Property.

1.	Purpose. Notwithstanding the restrictions set forth below, this Declaration is required
to maintain the security of the Site, to prevent human exposure to potentially
contaminated materials, and to prevent erosion of any potentially contaminated soil, if
any, from the Property.

2.	No Consumption of Groundwater. SCE&G covenants for itself, its successors and
assigns, that groundwater beneath the Property shall not be used by SCE&G for
consumptive use or other purposes without prior approval from the EPA. the
Department, or their successor agencies and assigns.

3.	Use of Property. SCE&G covenants for itself, its successors and assigns, that the
Property shall not knowingly or intentionally be used in a manner that would interfere
with the remediation of or the post remediation controls employed on the Property, if
any, without prior approval from the EPA, the Department, or their successor agencies
and assigns. Nothing in this Declaration; however, shall prevent SCE&G from
continuing its present uses of the Property.

4.	Restricted Uses. SCE&G covenants for itself, its successors and assigns, that the
Property shall not be used for residential, agricultural, child day-care facilities, schools,
or elderly care facilities nor for recreational purposes without prior approval from the
EPA, the Department, or their successor agencies and assigns.

5.	Drilling. SCE&G covenants for itself, its successors and assigns, that there shall be no
drilling of groundwater wells on the Property, other than groundwater monitoring and

2

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recovery wells only to the extent necessary, without prior approval from the EPA, the
Department, or their successor agencies and assigns.

6.	Excavation of Soils. SCE&G covenants for itself, its successors and assigns, that there
shall be no digging, excavation, grading or other disturbance of any known
contaminated soil on or in close proximity to the Property without prior notification to
EPA and the Department, and characterization to determine proper management.
SCE&G shall characterize, handle and dispose of all contaminated soil material from
the Property in accordance with applicable laws, regulations, and guidelines. Nothing
in this Declaration shall prevent SCE&G from expanding, upgrading, or modifying its
substation facilities located on the Property so long as it remains in compliance with
the requirements of this Section 6 of the Declaration. Furthermore, nothing in this
Section 6 of this Declaration shall prevent SCE&G, its lessees or licensees, or any third-
party provider/owner, from the continued use, repair and/or replacement of any existing
utilities or utility related facilities on or in close proximity to the Property, including,
but not limited to, power poles; light poles; guy wires; communications handholes.
ground systems, conduit and lines: electrical manholes, conduit and conductors; fiber
optic conduit and cabling; communications pedestals: water meters and water valves;
fire hydrants; irrigation control valves; utility cabinets: or water meters.

7.	Limited Access to Property by the EPA and the Department. Subject to the
limitations, restrictions, and requirements set forth herein, SCE&G, or its successor in
title of the Property, covenants and grants the EPA, the Department, or their successor
agencies and assigns, and all other qualified persons performing response actions under
the EPA's or the Department's oversight, supervision, and control, any of which shall
be deemed an ("Agent") of the EPA or the Department, shall be provided restricted
and limited access to the Property for the following limited purposes (i) inspecting the
Property, (ii) monitoring the condition of the Property, (iii) verifying information
relevant and related to this Declaration, (iv) sampling the soils or ground water beneath
the Property, (v) assessing the need for additional quality control practices, (vi)
inspecting and copying records as may be permitted pursuant to the terms, conditions,
and limitations of the AOC: (vii) assessing any required compliance by SCE&G with
the AOC or UAO, or (viii) assessing compliance with the land use restrictions set forth
in this Declaration.

8.	Restrictions on Access to the Property/Safety Compliance. The EPA, the
Department, or their successor agencies and assigns, acknowledge that the Property is
currently used as an electrical substation, that there is high voltage use on the Property,
and that there are grounding rings and grids below the surface of the Property, all of
which, along with other conditions, present extreme safety hazards which can result in
the loss of life. Therefore, the EPA, the Department, or their successor agencies and
assigns, or any persons acting on their behalf, or under their supervision and control,
any of which shall be deemed an ("Agent") of the EPA or the Department, shall enter
the Property at their own risk. The EPA and the Department, or their successor agencies
and assigns, shall indemnify and hold SCE&G harmless from any personal injuries or

3

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property damage incurred because of such entry into the Property by an Agent of either
the EPA or the Department. Under no circumstances shall SCE&G, it successors and
assigns, be liable for any injury to person or to property occurring because of an Agents
entry into or onto the Property, regardless of the cause of such injury or damage. Also,
entry into the Property shall be subject to the following additional limitations and
conditions: (i) no Agent may enter the Property without first having received all
necessary health and safety training required by SCE&G or any state or federal agency
to enter into and perform work in an active electrical substation; (ii) any entry must be
arranged and scheduled in advance with SCE&G; (iii) no Agent shall enter the Property
without being accompanied by a representative of SCE&G; (iv) all Agents entering the
Property shall at all times abide by all rules and regulations of SCE&G regarding entry
into and health and safety requirements related to working in an electrical substation;
(v) no Agent shall enter the Property without wearing any and all required safety gear
which must be supplied by either the EPA or the Department; and (vi) no Agent shall
dig into or otherwise disturb the surface of the Property without the prior authorization
and written consent from SCE&G as to time, location, and depth. To the extent that
any soil disturbance or digging into the surface presents a safety hazard related to the
electrical substation, SCE&G may deny the request in its sole discretion. Under no
circumstances shall the EPA. the Department, or their successor agencies or assigns, or
anyone acting on their behalf, have access to the interior of any building located on the
Property, or access to any records or other information owned by any unaffiliated
licensee or lessee of any portion of the Property.

Declaration Runs with Title. The covenants and restrictions set forth in this
Declaration shall run with the title to the Property and shall be binding upon SCE&G,
its successors and assigns, and successors in title to the Property. It is expressly agreed
that the Department, the EPA, and their successor agencies and assigns, shall have the
right to enforce these covenants and restrictions against SCE&G, its successors and
assigns, and successors in title to the Property. SCE&G, its successors and assigns, and
successors in title to the Property, shall include the following notice on all deeds,
mortgages, plats, or any legal instruments used to convey any interest in the Property
(failure to comply with this paragraph does not impair the validity or enforceability of
this Declaration):

NOTICE: This Property is Subject to that certain Declaration of Covenants and

Restrictions dated	2018. recorded at the Register

of Deeds Office for Charleston County, South Carolina, in Book

	, at Page	 on	, and any subsequent

Amendments thereto.

Annual Statement of Compliance.

successors and assigns, or successors

4

Beginning in January 2020, SCE&G, its
in title to the Property, shall submit to the

N-5

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Department and the EPA a statement of compliance with this Declaration and the
covenants and restrictions as set forth herein, annually on or before January 31st of each
year. SCE&G, its successors and assigns, or successors in title to the Property, shall
provide one of the following notices in each Report:

"The covenants and restrictions applicable to this Property are being properly
maintained, and no development or use which is inconsistent with the Declaration of
Covenants and Restrictions has occurred since the Effective Date of the Declaration,
or since the date of the last annual report,"

Or,

"The covenants and restrictions applicable to this Property arc not being properly
maintained,"

11.	Term/Amendment. This Declaration shall remain in place until such time as the
Department has made a written determination that the covenants and restrictions set
forth in this Declaration are no longer necessary. This Declaration shall not be
amended without the written consent of the Department or its successor agency or
assigns. The Department shall not consent to any such amendment or termination
without the consent of the EPA and SCE&G, such consent not to be unreasonably
withheld.

12.	EPA Third-Party Beneficiary. It is expressly agreed that the EPA is not the recipient
of a real property interest by virtue of this Declaration, but is a third-party beneficiary
of this Declaration and, as such, has the rights of enforcement of its terms and

conditions.

13.	Reservation of Rights. This Declaration only applies to the Property expressly
identified in Exhibit A and does not impair the Department's and the EPA's authority
with respect to any other real property owned by SCE&G.

N-6

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NOTICES AND SUBMISSIONS

Whenever, under the terms of this Declaration, written notice is required to be given or any other
document is required to be sent by one party to another, it shall be directed at the addresses
specified below.

As to EPA:

Attn: Remedial Project Manager
CERCLA Docket No: 98-16-C, Calhoun Park Area Site
Superfund Remedial and Site Evaluation Branch
Superfund Division

United States Knvironmental Protection Agency, Region 4
Atlanta Federal Center
61 Forsyth Street, SAV.

Atlanta. Georgia 30303-8960

As to the Department:

Attn: Project Manager

Federal Remediation

Bureau of Land and Waste Management

mux

2600 Bull Street

Columbia, South Carolina 29201

As to SCE&G:

Attn: Director, Environmental Services
South Carolina Electric & Gas Company

Mail Code C-221
100 SCANA Parkway
Cayce, South Carolina 29033

[SIGNATURES TO FOLLOW]
6

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IN WITNESS WHEREOF, SCE&G has caused this Declaration to be executed as of the
date first above written.

WITNESSES:

'4^

SOUTH CAROLINA ELECTRIC & GAS
COMP,

Name. RojldoJ M .^nQ

¦0<. VP- -SdfA MA A^mift.tArgckoN

STATE OF SOUTH CAROLINA

COUNTY OF LEXINGTON

Its

)

) ACKNOWLEDGEMENT
)

_ (Notary Public), do hereby certify that,
Tin Bis/her capacity as ^av'\OT l/ite* fat#- of South Carolina

Electric & Gas Company, personally appeared before me this day and acknowledged the due
execution of the foregoing Declaration, on behalf of South Carolina Electric & Gas Company.

Witness my hand and official seal this

Notary Public for SaA /a QtvrfiAk.
My Commission Expires: %7- %%

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IN WITNESS WHEREOF, the Department has caused this Declaration to be executed as
of the date first above written.

WITNESSES:

SOUTH CAROLINA DEPARTMENT OF
HEALTH AND ENVIRONMENTAL

CONTROL

Donald L. Siron. P.d^ Assistant Chief
Bureau of Land and Waste Management
South Carolina Department of Health and

Environmental Control

STATE OF SOUTH CAROLINA
COUNTY OF RICHLAND

-iW\ LfiS "Rkft

ACKNOWLEDGEMENT

(Notary Public), do hereby certify that,

Donald L, Siron. P.O. . Assistant Chief of the Bureau of Land and Waste Management of the
South Carolina Department of Health and Environmental Control, personally appeared
before me this day and acknowledged the due execution of the foregoing instrument.

Witness my hand and official seal this	day ofSWfK^J^ , 2018.

Notary Public for , *>';,• ^, -- -
My Commission Expires:	\ s.'*-..	

StateTsoWarollrta

N-9

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EXHIBIT A

SEE ATTACHED BOUNDARY SURVEY OF 1 CHARLOTTE STREET, CITY OF
CHARLESTON, DATED JUNE 11, 2018, AND PREPARED BY FORSBERG
ENGINEERING AND SURVEYING, INC. FOR SCE&G

9

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RECORDER'S PAGE

NOTE: This page MUST remain
with the original document

Filed By:

SOUTH CAROLINA ELECTRIC & GAS CO.
RIGHT OF WAY DEPARTMENT MC CH 29
POST OFFICE BOX 760
CHARLESTON SC 29402

RECORDED

Date:

November 13, 2018

Time:

11:27:30 AM

Book Page

DocTvoe

| 0759 | 782

Rest/Covs I



Elaine H. Bozman, Register
Charleston County, SC

MAKER:

SCE&G COAL

RECIPIENT:

NA

Original Book:

# of Sats:£

Note:

Original Page:

# of Pages:

j # of References:

Recording Fee
Extra Reference Cost
Extra Pages
Postage
Chattel
TOTAL

DRAWER
CLERK

11

1000

6.00

16.00

Drawer 4

SLW

0759
Book

782
Page

11/13/2018
Recorded Date

I 111

gs

Original Book

Original Page

D

Doc Type

11:27:30
Recorded Time

843-958-4800 101 MEETING STREET CHARLESTON, SC 29401 www.charlestoncounty.org

N-12

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Envir^S^i	Contractors

File No. 02216661.00
May 31, 2023

Care of Mr. Alex Daniel	*

East West Hospitality

1671 Belle Isle Avenue, Suite HQ, Office 0

Mt, Pleasant, SC 29464	5 W3

Mr. Chris Stanbery	5

Division of Site Assessment, Remediation, and Revitalization

South Carolina Department of Health and Environmental Control

2600 Bull Street

Columbia, South Carolina 29201

SUBJECT: Annual Statement: Maintenance of the Declaration of Covenants and Restrictions

Dear Mr. Stanbery and Mr. Daniel,

SCS Engineers (SCS) is pleased to provide you with the 2023 Statement of Maintenance of the
Covenants and Restrictions in accordance with VCC 08-5754-NRP (VCC) for The Gadsden
condominiums building located along Laurens Street, Concord Street, and Gadsdenboro Street in
Charleston, South Carolina (Site).

MAINTENANCE OF THE COVENANTS AND RESTRICTIONS

At the time of SCS's visual inspection of the Site by Christian Pullano on May 11, 2023, the property
includes The Gadsden condominium building is capped with landscaping and asphalt or concrete
surfaces which surround the structure. The Site is not being used for any of the purposes prohibited
by paragraphs 1 through 8 of the February 2016, Declaration of Covenants and Restrictions. The
Site is intact with no disturbance to Site soil or constructed. All storm water drains appear to be free
and clear of debris. The parking garage under the building appears unchanged and all asphalt
parking surfaces appear undisturbed. The Site is well maintained and has not been altered in any
way since the 2022 inspection of the Site. No additional monitoring or remediation has been done
since the previous inspection and no new potential sources of contamination were identified.

SCS Engineers will continue to inspect the property as needed. If the remedies are maintained, DHEC
will not receive further reports until May 31, 2024. If you have any questions, please feel free to

contact either of the undersigned at (843) 746-8525.

Sincerely,	/

Portion of the Calhoun Park Area Site in Charleston County,

South Carolina, New Tract C-l a Portion of TMS No.458-01-02-063
Voluntary Cleanup Contract #08-5754-NRP

Staff Professional
SCS ENGINEERS

Nina G. Marshtein, PG
Project Director
SCS ENGINEERS

400 Pierslcie Street, SuOe A North Charleston. South Carolina 29406 ( 8-

N-13

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Annual Statement: Maintenance of Covenants and Restrictions
New Tract C-l a Portion of TMS No. 458-01-02-063
Portion of the Calhoun Park Area Site in Charleston County, South Carolina
Voluntary Cleanup Contract #08-5754-NRP
	 Site Visit — May 1 1, 2023

Photograph 1: View of the Site facing west from Concord Street.

Photograph 2: View of the south side of the Site facing east along Laurens Street.

Page 1

N-14

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Annual Statement: Maintenance of Covenants and Restrictions
New Tract C-l a Portion of TMS No. 458-01-02-063
Portion of the Calhoun Park Area Site in Charleston County, South Carolina
Voluntary Cleanup Contract #08-5754-NRP
Site Visit — May 1 1, 2023

Photograph 4: View of undisturbed sidewalks, pavers, and landscaping around the

condominium building.

Page 2

N-15

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Annual Statement: Maintenance of Covenants and Restrictions
New Tract C-l a Portion of TMS No. 458-01 -02-063
Portion of the Calhoun Park Area Site in Charleston County, South Carolina
Voluntary Cleanup Contract #08-5754-NRP

Photograph 6: View of the north side of the Site facing east along Gadsdenboro Street.

Photograph 7: View of the parking garage on the ground floor of the building.

Page 3

N-16

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DocuSigri Envelope ID: 7FQB4D7E-FADB-453B-AA5E-5BB0AC5BFEB2	54475

Email Scanned

STATEMENT OF MAINTENANCE OF THE
DECLARATION OF COVENANTS AND RESTRICTIONS

SC DHEC, Division of Site Assessment, Remediation and Revitalization
Bureau of Land & Waste Management
2600 Bull Street
Columbia, SC 29201-1708

Please complete the following questionnaire for VCC 08-5754-NRP RB Charleston LLC regarding
New Tract A2-1, a portion of the Calhoun Park Area Site. The Property is further identified as New
Tract A2-1 located at 7 Calhoun Street, Charleston and Tax Map Serial Number 458-01-02-067,
which is a 0.656 acre portion of TMS 458-01-02-028. This Statement should be submitted by May
31st as set forth in the Declaration of Covenants and Restrictions.

•	Have all restrictions identified in the Declaration been maintained? X Yes 	No

•	Are you the current owner of the property that is responsible for maintaining the Restrictive

Covenant(s)? X Yes	No If not, provide contact information for the new

owner on the back of this form or on an additional page.

•	Have site conditions changed since the contract completion that would affect either a deed
restriction or requirements associated with the site? (Examples: a building has been

removed; soil has been excavated; or use of the property has changed.) 	Yes X No

*Please provide a detailed account of any changes with your completed questionnaire.

•	Describe the current property use:	Vacant land with parking	

•	Has additional monitoring or remediation been done since the contract was completed?
	Yes X No

•	Have any new potential sources of contamination been identified?

Yes X No

Signature,

ttuioiL J kais

^	40//bSb3/B0y4W .

Print Name Kenneth I. Krehs

Title Authorized Signer

Company RR Charleston T.T.C

Mailing Address 4124 Worth Avenue, Suite 200
City, Zip Code Columbus, OH 43219	

Phone Number 614.246.2400

E-Mail Address kjkr eb s@rockbrid gecapital.coin

May 31, 2023

Date					

File 54475

40

N-17

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DocuSign Envelope ID: 7F0B4D7E-FADB-453B-AA5E-5BB0AC5BFEB2

STATEMENT OF MAINTENANCE OF THE
DECLARATION OF COVENANTS AND RESTRICTIONS

SC DHEC, Division of Site Assessment, Remediation and Revitalization
Bureau of Land & Waste Management
2600 Bull Street
Columbia, SC 29201-1708

Please complete the following questionnaire for VCC 08-5754-NRP RB Charleston LLC regarding
New Tract A2-2, a portion of the Calhoun Park Area Site. The Property is further identified as New
Tract A2-2 located at 7 Calhoun Street, Charleston, which is a 1.142 acre portion of TMS
458-01-02-064. This Statement should be submitted by May 31sl as set forth in the Declaration of
Covenants and Restrictions.

•	Have all restrictions identified in the Declaration been maintained? X Yes 	No

•	Are you the current owner of the property that is responsible for maintaining the Restrictive

Covenant(s)? X Yes 	No If not, provide contact information for the new

owner on the back of this form or on an additional page.

•	Have site conditions changed since the contract completion that would affect either a deed
restriction or requirements associated with the site? (Examples: a building has been

removed; soil has been excavated: or use of the property has changed ) 	Yes X No

*Please provide a detailed account of any changes with your completed questionnaire.

•	Describe the current property use: Vacant land with parking	

•	Has additional monitoring or remediation been done since the contract was completed?
	Yes X No

•	Have any new potential sources of contamination been identified?

	Yes 2^— No

- DocuSigned by:

Signature UmjaxHi, J faaM

	4077E8537B09497...

Print Name Kenneth I, Krebs

Title Authorized Signer

Company RB Charleston 1 I P.

Mailing Address 4124 Worth Avenue, Suite 200
City, zip Code Columbus, OH 43219	

Phone Number 614.246.2400

E-Mail Address kikrebs(a>rockhridgecapital.corn

Date May 31, 2023
File 54475

N-18

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STATE OF SOUTH CAROLINA ) DECLARATION OF COVENANTS

)

COUNTY OF CHARLESTON )	AND RESTRICTIONS

THIS DECLARATION OF COVENANTS AND RESTRICTIONS

("Declaration") is made and entered into this 	day of	 2020 by

Housing Authority of the City of Charleston, a local government entity (hereinafter
referred to as "the City").

RECITALS

WHEREAS, The City is the owner of certain real property in Charleston
County, South Carolina, more particularly described in Exhibit A attached hereto
and incorporated herein by reference ("Property"); and

WHEREAS, contaminants in excess of allowable concentrations for
unrestricted use remain at the Property; and

WHEREAS, the Property is the subject of Voluntary Cleanup Contract 08-
5754-NRP ("VCC") entered into by the South Carolina Department of Health and
Environmental Control ("Department") and the City pursuant to the
BrownfieldsA/oluntary Cleanup Program, S C. Code Ann. §§ 44-56-710, et seq..
as amended: the South Carolina Hazardous Waste Management Act (SCHWMA),
S.C. Code Ann. §§ 44-56-10, et seq., as amended, the Comprehensive
Environmental Response, Compensation and Liability Act (CERCLA), 42 U.S.C.
§§ 9601, et seq., as amended; the State Underground Petroleum Environmental
Response Bank Act, (SUPERB Act), S C. Code Ann. §§ 44-2-10, et seq.. as
amended; and the Pollution Control Act (PCA), S.C. Code Ann. §§ 48-1-10 et seq..
as amended; and

WHEREAS, the terms and conditions of the VCC inure to the City as a
Beneficiary and pursuant to Paragraph 11 of the VCC; and

WHEREAS, the Property may be used for certain purposes without further
remediation in accordance with the conditions of the VCC and in compliance with
certain restrictions that are required to be placed on development and use of the
Property as set forth in this Declaration, and

WHEREAS, The City has agreed to impose restrictions on the manner in
which the Property may be developed (said restrictions to run with the land and
inure to the benefit of and be enforceable by the Department and its successor
agencies); and

Declaration of Covenants and Restrictions, Page 1 of 7
Voluntary Cleanup Contract 08-5754-NRP

N-19

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NOW, THEREFORE, KNOW ALL. PERSONS BY THESE PRESENTS that the City
hereby declares and covenants on behalf of itself and its successors that the
Property described as Tract C Affordable in Exhibit A shall be held, mortgaged,
transferred, sold, conveyed, leased, occupied, and used subject to VCC 08-5754-
NRP dated, July 25, 2008 to include the following restrictions, which shall touch
and concern and run with the title to the Property.

1.	Groundwater beneath the Property shall not be used for any purpose
without prior written approval from the Department or its successor
agency.

2.	The Property shall not be used for the following purposes: residences
of any type unless the habitable portion is raised above the surface soil
or separated from the surface soil by impervious material, child care or
elder care facilities, schools, parks, playgrounds, athletic fields, or
agricultural use.

3.	Two (2) feet of soil cover ("Soil Cap") was placed on the Property by a
previous owner. Following initial redevelopment a water-permeable
geotextile barrier shall be maintained over the Soil Cap in landscaped
areas not covered by impervious material.

4.	The disturbance and handling of the soil on the Property shall be in
material compliance with Section 5 ("Soil Management") of the Soil
Management Plan, which is attached hereto as Exhibit B and
incorporated by reference.

5.	The Department or its successor agency, and all other parties
performing response actions under the Department's oversight, have an
irrevocable right of access to perform and oversee response actions
conducted on the property.

6.	The covenants and restrictions set forth herein shall run with the title to
the Property and shall be binding upon the City and its successors. The
City and its successors shall include the following notice on all deeds,
mortgages, plats, or any legal instruments used to convey any interest
in the Property (failure to comply with this paragraph does not impair the
validity or enforceability of these covenants):

NOTICE: This Property Subject to Declaration of Covenants

and Restrictions recorded on the 	 day of

	20	, at Book	Page	,

Officer of the Register of Deeds, and any subsequent
Amendments Recorded thereto.

Declaration of Covenants arid Restrictions, Page 2 of 7
Voluntary Cleanup Contract 08-5754-NRP

N-20

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7.	The City and its successors and assigns shall submit to the Department
a statement of maintenance of the covenants and restrictions as set forth
above on or before May 31s! of every year.

8.	This Declaration shall remain in place until such time as the Department
has made a written determination that the covenants and restrictions set
forth herein are no longer necessary. This Declaration shall not be
amended without the written consent of the Department or its successor
agency.

9.	This Declaration only applies to the Property expressly identified in
Exhibit A and does not impair the Department's authority with respect to
any other real property under the control of the City.

[Remainder of page intentionally left blank]

Declaration of Covenants and Restrictions, Page 3 of 7
Voluntary Cleanup Contract 08-5754-NRP

N-21

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IN WITNESS WHEREOF, HOUSING AUTHORITY OF THE CITY OF
CHARLESTON has caused this instrument to be executed as of the date first

above written.

HOUSING AUTHORITY OF THE CITY OF
CHARLESTON

WITNESSES:	A SOUTH CAROLINA LOCAL GOVERNMENT

By:

(Name and Title)

STATE OF	)

^ ACKNOWLEDGEMENT
)

COUNTY OF

I,	(Notary Public), do hereby certify

that, 	, an authorized representative of the

HOUSING AUTHORITY OF THE CITY OF CHARLESTON, personally appeared
before me this day and acknowledged the due execution of the foregoing
instrument, on behalf of the LOCAL GOVERNMENT

Witness my hand and official seal this	day of	, 20	.

Notary Public for	

My Commission Expires:

Declaration of Covenants and Restrictions, Page 4 of 7
Voluntary Cleanup Contract 08-5754-NRP

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IN WITNESS WHEREOF, the Department has caused this instrument to be
executed as of the date first above written.

SOUTH CAROLINA DEPARTMENT OF HEALTH

WITNESSES.

AND ENVIRONMENTAL CONTROL

U



- By:

Bureau of Land and Waste Management

Environmental Quality Control

Henry J, Porter, Chief



STATE OF <->

) ACKNOWLEDGEMENT

COUNTY OF | - ,

I r\G +t^

I.	k>i\
-------
EXHIBIT A

Declaration of Covenants arid Restrictions, Page 8 of 7
Voluntary Cleanup Contract 08-5754-NRP

N-24

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-------
EXHIBIT B

Declaration of Covenants and Restrictions, Page 7 of 7
Voluntary Cleanup Contract 08-5754-NRP

N-26

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ENGINEERS

SOIL MANAGEMENT
PLAN

A PORTION OF THE CALHOUN PARK AREA
CHARLESTON,

SOUTH CAROLINA
VOLUNTARY CLEANUP CONTRACT
#08-5754-NRP

Prepared fori

SOUTH CAROLINA DEPARTMENT OF HEALTH AND
ENVIRONMENTAL CONTROL

Bureau of Land and Waste Management
2600 Bull Street
Columbia, South Carolina 29201

On Behalf Of:

EAST WEST CUMBERLAND PARK ASSOCIATES, LLC

c/o McNair Law Firm, P.A.

100 Calhoun Street
Charleston, South Carolina 29401

Prepared by>

SCS ENGINEERS

Ashley River Center
2655 Evott Lane, Suite 109
North Charleston, South Carolina 29405
(843) 746-8525

August 28, 2009
Hie No. 02207636.00

OfficM Nationwide
www.tcungimMrt.com

J^ECEIVEQ

AUG 3 1 2009

SITE ASSESSMENT,
REMEDIATION &
REVITAJJZATION

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East West Cumberland Park Associates, Inc.

SECTION 1
INTRODUCTION AND BACKGROUND

1.1	INTRODUCTION

/

Hus SMP regulates subsurface soil disturbance and handling of subsurface soil before,
during, and following redevelopment activities at the former Ansonborough Homes Area in
downtown Charleston, Charleston County, South Carolina ('"Property*'). The Property is
the subject of a Voluntary Cleanup Contract, #08-5754-NRP ("VCC*}, between the South
Carolina Department of Health and Environmental Control ("SCDHEC") and East West
Cumberland Park Associates, LLC ("East West"). See Appendix A. This SMP contains
procedures designed to (1) protect worker health, and safety during subsurface soil
excavation activities; (2) contain impacted subsurface soil; (3) dispose of impacted
subsurface soil removed from the Property; (4) ensure adequate soil cap replacement
following excavation acti vities; and (5) prevent and respond to unauthorized excavation
activities on the Property.

For purposes of this SMP, the terms "subsurface soil" or "subsurface" refer to soil located
below the two-foot roil cap currently on the Property.

1.2	PROPERTY HISTORY AND PROPOSED REDEVELOPMENT

The Property includes two parcels located at the intersection of Calhoun, Concord,

Laurens, and Washington Streets and is further defined in the VCC. The Property has been
developed with portside businesses, such as a ship building and lumber yards, as well as
residences, for over 150 years. A two-foot soil-cap was placed over the Property in 1996
and 1997- Details of the history, prior environmental assesanent, and planned
redevelopment of the Property are discussed in the VCC.

Additional assessment of the Property was conducted pursuant to the VCC and is
documented in the VCC Investigation Report, dated August 1,2008. See Appendix B. On
October 7,2008, SCDHEC issued a letter to East West requesting that a SMP be submitted.
SCDHEC initially requested that the SMP include a schedule for the placement and
maintenance of the additional two feet of soil cover. This request was based solely on East
West's proposal to add additional soil cover, however, and the additional soil cover was not
required by SCDHEC. SCDHEC also requested the SMP outline personal protection to be
taken during redevelopment activities, an explanation of how impacted soil will be
contained and, if removed from the Property, disposed. Finally, SCDHEC requested the
SMP address the potential for unauthorized/unsolicited excavation activities. This SMP is
in response to SCDHEC's letter.

The redevelopment of the Property will occur in phases. SCS, in consultation with East U
West, prepared this SMP based on current redevelopment plans. This SMP may be revis«yVj
in the event material changes to redevelopment plans occur that significantly increase the
potential for exposure to impacted subsurface soil. Any revision to this SMP wall be
submitted to the SCDHEC for approval prior to implementation.



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East West Cumberland Park Associates, Inc.

1,3 SOIL CAP PLACEMENT AND MAINTENANCE

The existing top two feet of the Property is comprised of impoited soil and is considered
"clean fill."

Redevelopment on the northern portion of the Property (Lot A) is scheduled to begin in late
2010. The redevelopment schedule for the southern portion of the Property (Lot C) has not
been finalized. In the meantime, the Property will be covered with grass and stormwater
controls will be maintained to minimize surfece erosion,

The Property mil be inspected quarterly and washouts or erosion damage will be repaired
promptly. A summary of the quarterly soil cap inspections and any repairs will be
submitted to SCDHEC by May 31st of each year by SCS Engineers ("SCS") or East West's
designee until construction has been initiated on both Lot A and Lot C.

RECEIVED

MAY -

ssn n'~iEC • L'L HEAD OF
iand&was^Wqemot

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East West Cumberland Park Associates, Inc.

SECTION 5

SOIL MANAGEMENT

5.1 OBJECTIVE

The objective of this section is to establish procedures for the management of soil
during activities that disturb subsurface soil at the Property, conditions on reuse of
soil at the Property, and procedures for the disposal of any soils removed from the
Property.

5.1 EXCAVATION AND REDEVELOPMENT ACTIVITIES

5.2.1	Redevelopment Activities

SCS concluded that die levels of contaminants identified In the subsurface soils at the
Property mil not present a risk to future residents or construction workers. However, soil
from the subsurface will be managed in a way that will not cause sediment
accumulation la storm water runoff, Le., by either covering stockpiled soO or
adhering to the applicable Storm Water Pollution Prevention Pkn.

Although project areas have been adequately characterized prior to construction,
contaminated soil could be unexpectedly encountered during excavation. The Project
Manager, First Res ponder, or sponsoring group representative must notify the Safety
Representative and tile Local Owner Representative immediately if suspected
contamination is discovered. If contamination is discovered, there will be no
differentiation between existing "cap" soils or subsurface soils; therefore, all
excavated soils in the area of contamination will be properly disposed off-site.

Excavated soil thai is suspected or known to be contaminated wiJl be placed in covered
bins or other sealed containers or stockpiled and covered with plastic sheeting.

Construction or other work in the affected area shall be stopped, and the affected area shall
be cordoned off until an evaluation can be made.

5.2.2	Soil Disposal

Following the evaluation of the excavated subsurface soil by the First Responder and
when contamination is not detected, excavated subsurface soil may be re-used on the
Property in areas below the existing two (2) foot soil cap. Following the evaluation of
soil from the cap by the First Reaponder and when contamination is not detected, soil
removed from the cap may be reused on the Property. Soil removed from the cap andf}
not reused on -site, will be prwperiy characterized and disposed off-site.	r"H

m

C*T ZjJ

y I

Subsurface soil not reused onsite, as allowed in this SMP, shall be properly
characterized and disposed off-site. At a minimum, the soil will be disposed at a
municipal solid waste landfill. The landfill may require analytical testing of the soil to p£J ^
confirm that constituent concentrations do not exceed the landfill's waste acceptance	>_. 6

W. 5 5

All stockpiled soil will be handled in such a way to prevent runoffferosion. Soil QjJ
removed from the Property shall not be reused off-site.

o
w

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East Wgsr Cuniberiand Pork Associates, lag*

TABLE OF CONTENTS
Ssefien	Pane

Tohlo ®fConf®itSa
Slgnohire

1	Introduction and Background	—		1

1*5	ftsj. fb ¦¦ mLai	.. ~	... —	^ l¥l	^ ,n t	irtai n Uiil	t

««»»•	i

1 .3 Soil Cap Placement and Maintenance....	—	—		..,..2

2	Exposure Scenarios and Risks	..................................................3

2.1	Exposure Scenarios During Site Redevelopment				

2.2	Current Property Conditions and Related Exposure Risks.3

3	Prevention of Exposure to Subsurface Soil

3,1 Personnel Exposure Routes .——,	,—					—_„4

3*2 Personal Protection &yf}pfligyifiimiiiTni.utiiin-riiiiiiiniiiiir-jijfii[- ¦¦ m-uuu-uu i.,,u.iJU,i.i.unn 	 4

3.3	Engineering Controls		.						.,	.4

34 Toolbox/Safety Meetings	——	„.,4

4	Soli Management Plan Logistics

5	Sal! Management		............6

5.1	Objective		„	,			.				—				„~™6

5.2	Excavation and Redevelopment Activities...				

5.2.1 Redevelopment Acttvltles™	...,—				

5.3	Past Redevelopment Activities....					

5.4	Documentation		_			_					

6	UnpsmtEttod/Unseitcifed Sol Excavation Activities		.....8

6.1	Before Redevelopment..								

6.2	During Redevelopment						„.„8

6.3	After Sff*lttyifffnpfman+-	1	r	1.-1„.1-—T.	¦			mi 		,„ iS

APPENDICES

A Voluntary Cleanup Contract, # 08-5754-NRP
B Voluntary Cleanup Contract Investigation Report, August 1, 2008
C letter from SCS Engineers to the Soufr Carolina Department of Health and Environmental
Control, September 16,2008

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Edit West Cumberland fork Associates, Inc.

SIGNATURE PAGE

This document, entitled "Soil Management Plan," lias been prepared for a portion of the Concord
Park Area site located within the perimeter created by the intereections of Calhoun, Concord,
Laurens, and Washington Streets in Charleston, South Carolina at the request of East West
Cumberland Park Associates, LLC. It has been prepared in accordance with the guidelines set
forth in Voluntary Cleanup Contract #08-5754-NRP. It has been prepared in accordance with
accepted quality control practices and has been reviewed by the undersigned.

Project Professional
SCS ENGINEERS

SCPG License #2514

Project Manager
SCS ENGINEERS

SC PG License # 898

Concord fork

Sol I Management Plan

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lost West Cumberland Park Assoeletas, Inc.

LIMITATIONS

This Soil Management Plan ("SMP") does not cover general health and safety requirements for
activities conducted at the subject property. A separate Health and Safety ("H&S") Plan
prepared in accordance with applicable requirements, including those of the Department of
Labor, Occupational Safety and Health Administration ("OSHA"), may be necessary for such
activities. Additionally, this SMP is not intended to address compliance with requirements
outside the scope of Vo luntary Cleanup Contract #08-5754-NRR Requirements not addressed
by this SMP include land disturbance permitting, stormwafcr peraaitting, and OSHA construction
practices.

Concord Parle

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Eoat Wtit Cumberland Porte Assoclntei, lite.

SECTION 1
INTRODUCTION AND BACKGROUND

1.1	INTRODUCTION

This SMP regulates subsurface soil disturbance and handling of subsurface soil before,
during, and following redevelopment activities at the former Ansonborough Homes Area in
downtown Charleston, Charleston County, South Carolina ("Property"). Hie Property is
the subject of a Voluntary Cleanup Contract, #08-5?54-NRP ("VCC"), between the South
Carolina Department of Health and Environmental Control ("SCDHEC") and East West
Cumberland Park Associates, LLC ("East West"). See Appendix A. This SMP contains
procedures designed to(l) protect worker health and safety during subsurface soil
excavation activities; (2) contain impacted subsurface soil; (3) dispose of impacted
subsur&ce soil removed from the Property; (4) ensure adequate soil cap replacement
following excavation activities; and (5) prevent and respond to unauthorized excavation
activities on the Property.

For purposes of Ms SMP, the terras "subsurfece soil" or "subsurface" refer to soil located
below the two-foot soil cap currently on the Property.

1.2	PROPERTY HISTORY AND PROPOSED REDEVELOPMENT

The Property includes two parcels located at the intersection of Calhoun, Concord,

Laurens, and Washington Streets and is further defined in the VCC. The Property has been
developed with portside businesses, such as a ship building and lumber yards, as well as
residences, for over 1 SO years. A two-foot soil-cap was placed over the Property in 1996
and 1997. An additional two-foot cap mil be placed on top ofthe existing cap during
redevelopment to raise the Property's base grade elevation. Details ofthe history, prior
environmental assessment, and planned redevelopment ofthe Property are discussed in the
VCC.

Additional assessment of the Property was conducted pursuant to the VCC mid is
documented in the VCC investigation Report, dated August 1,2008. Sec Appendix B. On
October 7,2008, SCDHEC issued a letter to East West requesting that a SMP be submitted.
SCDHEC requested that the SMP include a schedule for the placement and maintenance of
the additional two feet of soil cover. SCDIIEC also requested the SMP outline personal
protection to be taken during redevelopment activities, an explanation of how impacted soil
will be contained and, if removed from the Property, disposed. Finally, SCDHEC
requested die SMP address the potential for unauthorized/unsolicited excavation activities.
This SMP is in response to SCDHEC's letter.

The redevelopment of the Property and the installation of the additional two-foot cap will
occur fat phases. SCS, in consultation with East West, prepared this SMP based on current
redevelopment plans. This SMP may be revised in the event material changes to
redevelopment plans occur that significantly increase the potential for exposure to
impacted subsurface soil. Any revision to this SMP will be submitted to the SCDHEC for
approval prior to implementation.

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East West Cumberland Parte Aisoclcf », Inc.

1,3 SOIL CAP PLACEMENT AND MAINTENANCE

The existing fop two feet of the Property is comprised of imported soil and Is considered
"clean fill.** Installation of the additional two foot soil cap on the Property will occur in
phases and prior to redevelopment

Redevelopment on the northern portion of the Property (Lot A) is scheduled to begin in late
2010. The additional two feet of clean fill rail will be installed on Lot A prior to
construction. The redevelopment schedule for the southern portion of the Property (Lot C)
has not been finalized; however, the additional two feet of clean soil will be installed prior
to construction on that portion of the Property as well. In the meantime, the Property will
be covered with grass and stonnwater controls will be maintained to minimize surface
erosion.

The Properly will be inspected quarterly and washouts or erosion damage will be repaired
promptly. A summary of the quarterly soil cap inspections and any repairs will be
submitted to SCDHEC by May 31st of each year by SCS Engineers ("SCS") or East West's
designee until construction has been initiated on both Lot A and LotC.

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Boat Wett Cumberland Pork Associates, lac*

SECTION a
EXPOSURE SCENARIOS AND RISKS

3.1	EXPOSURE SCENARIOS DURING SITE REDEVELOPMENT

The first exposure scenario would apply following the purchase of the Property by
East West and until construction begins there. Tbe Property will remain vacant
daring this period. The existing soil cap is snCRcteat to prevent exposure of
intermittent workers and trespassers to the underlying soil, and the risk assessment
conducted by SCS Engineers Indicates the levels of PAHs detected in the existing cap
would not pose a risk even to daily site workers over a three (3) month period.

The second exposure scenario applies only to site workers during disturbance of subsurface
soil. The risk af exposure to workers would exist during construction of site foundations
and installation of subsurface utilities or other subsurface work. Soil removed from the cap
does not require special management other than ensuring it is not commingled with
contaminated soil and, where appropriate, is replaced.

When construction does extend beneath the soil cap, the extremely shallow water table will
likely create conditions unsuitable for workers to enter the trenches. Therefore, there
appears to be minimal exposure opportunity to the soil beneath the soil cap, unless it is
stock-piled on site. Soil management is discussed in Section 5,

The third exposure scenario occurs when the Property is completely redeveloped. The
Property will be developed with muitifamily residential and commercial uses. The
development pirns do not include residential space at ground level. Over ninety percent of
the surface will be covered with either pavement or structures and the balance will have
non-native, clean soil for landscaping brought in from outside sources. A distinct, water-
permeable geotextile will he placed beneath dean fill installed within landscaped
areas and will serve as an exposure harrier to the older soil cap and subsurface soils.
Site occupants will not be exposed to the subsurface soil and will not have a route of access
to subsurface soil or site groundwater. Groundwater will not be used for any purpose at the
Property, and all water wall be provided by the City of Charleston. Therefore, no known
risk of exposure exists to site occupants following redevelopment.

Hie fourth exposure opportunity is through unauthorized or unsolicited subsurface
penetration below die soil cap (Le. drilling or excavation). Unauthorized or unsolicited
activities, especially after redevelopment has been initiated, would not be expected to last
more than one or two days before being discovered and stopped. Therefore, based on die
risk assessment conducted for the Property, any significant exposure is considered unlikely
under this scenario.

2.2	CURRENT PROPERTY CONDITIONS AND RELATED EXPOSURE RISKS

Analytical results documented in the VCC Investigation Report dated August 1,2008, and
related exposure risks are discussed in SCS* correspondence to SCDHEC dated September
16,2008. See Appendix C. SCS concluded that the levels of contaminants identified in
the subsurface soil at the Property will not present a health risk to future residents or
construction workers.

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East West Cumberlond Pork Associates, Inc.

SECTION 3

PREVENTION OP EXPOSURE TO SUBSURFACE SOILS

3.1	ratSONNR, EXPOSURE ROUTES

The primary exposure route to contaminated soils is through ingestion, specifically through
hand-to-mouth contact. Therefore, personal protective equipment (PPE) and engineering
controls must be used by construction workers to limit exposure to subsurface soil through
ingestion. This SMP identifies the minimum PPE and engineering controls necessary to
prevent such exposure.

3.2	PERSONAL PROTECTION EQUIPMENT

Based upon the low concentrations of constituents detected at the Property, this SMP
requires Level D PPE for workers who are expected to come into contact with subsurface
soil. See NIOSH/OSHA USCG/cmd the EPA Occupational-Safety and Health Guidance
Manualfar Hazardous Waste Site Activities, October 1985; See also, EPA Standard
Operating Safely Guides, Publication 9285.1-03, dated June 1992. Level D protection is
appropriate for conditions where de minimis levels of contamination exist. Level D
protection is primarily a work uniform (i.e., coveralls) and safety shoes/boots. Other PPE
(e,g., gioves, safety glasses, etc.) may be appropriate depending on assigned tasks.

3.3	FIRST RESPONDS

A person who has completed "Hazardous Materials First Responded Awareness
(Level 1)" 8-hour training (First Responder) will be present daring disturbance of
subsurface soils. Hazardous Materials First Responder Training includes instruction
on 29 CFR 1910.120 and the National Fire Protection Association Standard for
Competence of Rcspondcrs to Hazardous Materials Incidents (NFPA 472). This
training will enable the First Responder to identify hazardous materials that may be
discovered on site and to detect and identify such materials from a safe distance using
sight and odor.

Responsibilities of the First Responder include:

•	The First Responder will have knowledge of and understand the nature of
contaminants found within the Calhoun Park Area Site which include
polyouelear aromatic hydrocarbons (PAHs) and volatile organic
compounds (VOCs) associated with creosote, coal tar, and other
petroleum-based products.

•	The First Responder will observe all activities which disturb subsurface
soils for physical evidence of contamination. Physical evidence for the
presence of the above referenced contaminants includes discolored oil
stringent odors, and viscous product within the soiL

•	The First Responder will notify the Safety Representative and the Local
Owner Representative immediately if suspected contamination is
discovered.

. Excavated soil that is suspected or knows to be contaminated will he
placed in covered bins or other sealed containers or stockpiled and covered
with plastic sheeting.

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Eaat Watt Cumberland Park Anoctof 1, Inc.

• Construction or other work in the affected area shall be stopped, and the
affected am shall be cordoned off until an evaluation can be made.

3.4	SNGINEERIN6 CONTtOU

For purposes of tills SMP, the following engineering controls shall be used in areas where
parsons are expected to come in contact with subsurface soil,

3.5	SIGNAGE

Appropriate signage shall be posted at each entry/exit of titese areas;

1.	No tobacco use in the work area.

2.	No eating or drinking in the work area.

3.	Required hand-washing upon exiting work area and prior to eating, drinking, or
tobacco use by persons exiting the work area.

14 TOOUOX/&AHTT MIITOMS

Required PPG and the need to avoid hand-to-mouth contact with subsurfece soil shall be
discussed with construction workers during toolbox/safety meetings associated with
subsurface soil excavations.

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Eoit West Cumberland Pork Asioclates, Inc.

SECTION 4
SOIL MANAGEMENT PLAN LOGtSTiCS

Contacts have been established to maintain the integrity of the soil management activities
for tile Property. Hie contacts are:

Rtgnletoiy

Ms. lo Cherie Overcash
SCDHEC

Bureau of Land and Waste Management
2600 Bull Street
Columbia, South Carolina 29201
(803) 896-4019

L«eof Owner Repraisntativs

Mr. Ross Bowker

East West Cumberland Park Associates
c/o Donald Furtado, Esq.

McNair Law Finn, PA.

100 Calhoun Street
Charleston, South Carolina 29405
(843) 723-7831

SCDHEC shall notify the Local Owner Representative and Safety Representative if
SCDHEC's contact information changes. Should revisions to the above-referenced contact
information be necessary, SCS or East West's designee shall revise this page of the SMP
and submit it to SCDHEC.

Local Regulatory

Ms. Christine Sanford Coker

SCDHEC

Trident EQC Office
1362 McMillan Avenue, Suite 300
North Charleston, South Carolina 29405
(843)740-1590

Sofoty R$pros6nfstiv®

Ms. Nina Marehtein, PG

SCS Engineers

26SS Evatt Lane, Suite 109

North Charleston, South Carolina 29405

(843)746-8525

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laif West CumbTlond Park A»»oclot«». Inc.

SECTION 5
SOIL MANAGEMENT

5.1 OBJECTIVE

The objective of flils section is to establish procedures for the management of soil
daring activities that disturb subsurface soil at the Property, conditions on reuse of
soil at the Property, and procedures for the disposal of any soils removed from the
Property.

S.I EXCAVATION AND REDEVELOPMENT ACTIVITIES

5.2.1	Redevelopment Activities

SCS concluded that the levels of contaminants identified in the subsurface soils at the
Property will not present a ride to future residents or construction workers. However, soil
from the subsurface will be managed in a way that will not cause sediment
accumulation in storm water runoff, Le., by either covering stockpiled soil or
adhering to the applicable Storm Water Pollution Prevention Plan.

Although project areas have been adequately characterized prior to construction,
contaminated soil could be unexpectedly encountered during excavation. The Project
Manager, First Respocder, or sponsoring group representative must notify the Safety
Representative and the Local Owner Representative immediately if suspected
contamination is discovered. If contamination is discovered, there will be no
differentiation between existing "cap" soils or subsurface rails; therefore, all
excavated soils in the area of contamination will be properly disposed off-site.
Excavated soil that is suspected or known to be contaminated will be placed in covered
bins or other scaled containers or stockpiled and covered with plastic sheeting.
Construction or other work in the affected area shall be stopped, and the affected area shall
be cordoned off until an evaluation cm be made.

5.2.2	Soil Disposal

Following the evaluation of the excavated subsurface soil % the First Responder and
when contamination is not detected, excavated subsurface may be re-used on the
Property in areas below the existing two (2) foot soil cap. Following the evaluation of
soil from the cap by the First Responder and when contamination is not detected, soil
removed from the cap may be reused on the Property. Soil removal from the cap and
not reused on-site, will be properly characterized and disposed off-site.

Snbsurfiace soil not reused onsite, as allowed in this SMP, shall be properly
characterized and disposed off-site. At a minimum, the soil win be disposed at a
municipal solid waste landfill. The landfill may require analytical testing of the soil to
confirm that constituent concentrations do not exceed the landfill's waste acceptance
criteria.

All stockpiled soil will be handled in such a way to prevent runoff/erosion. Soil
removed from the Property shall not be reused off-site.

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5.3	POST REDEVELOPMENT ACTIVITIES

Once excavation activities have been completed, the soil cap will be re-established, to the
extent possible, to prc-cxcavation elevation with either the original cap material or with
new clean fill. The SMP shall continue to be enforced for all post-redevelopment
activities that disturb subsurface soil Such activities include landscaping work which
may result in contact with soils beneath the geotextile barrier. Where such contact
may occur, the entity charged with enforcing this SMP will advise the landscape to
comply with the SMP In die event the geotextile barrier is breached.

5.4	DOCUMENTATION

A Soil Excavation Report (SBR) documenting excavation and soil disposal activities at the
Property during redevelopment shall be completed and submitted to SGDHEC by SCS or
East West's designee within SO days of completion of all redevelopment activities at the
Property. The SER may be submitted earlier if ail planned excavations at the Property
have been completed. Excavations where less than five cubic yards of subsurface soil are
removed shall be considered de minimis for documentation purposes and are not required
to be included in the SER. At a minimum, the SER will include:

•	Subsurface soil excavation dates,

•	Subsurface soil excavation contractor information (i.eM name, address, telephone

number)

•	Estimated volume of subsurface soil removed and disposed off-site
» Siie diagram depicting areas of subsurface soil disturbance

•	Unpermitted or unsolicited subsurface soil excavations occurring during

redevelopment

•	Laboratory data (if applicable) from subsurface soil samples

If subsurface soil was removed from the Property, the following information will also be
provided:

•	Willi n HIM II Mii M ¦ 			mmJI fit ifiiT.ni 111 in

i ransporter nains ana axiufess

•	Name and address of landfill where the subsurface soil was disposed
¦ Non-Hazardous Waste Manifests

•	Load tickets

Hie SER will also provide any recommendations for further action.

If laboratory analysis is conducted on subsurface soils at the Property during
redevelopment and concentrations exceed the standard calculated for the Baseline Report,
SCS will calculate Site Specific Limits for exposure period. SCS or East West's designee
shall submit such analytical data to SCDHEC within 30 days of receipt

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SECTION 6

UNPERMITTED/UNSOLICITED SOIL EXCAVATION ACTIVITIES

6.1	BEFORE REDEVELOPMENT

Prior to redevelopment, SCS or East West's designee will inspect the Property regularly to
determine if unpermitted or unsolicited soil excavation has occurred. If an unpermitted or
unsolicited activity is suspected, SCS or East West's designee will attempt to identify the
entity responsible for the activity and to track the soil if removed from the Property. Since
the Property may continue to be used as a public park prior to redevelopment, it is unlikely
that unpermitted or unsolicited soil excavation will occur prior to redevelopment

In order to minimize the risk of unpermitted or unsolicited excavation, a sip will be posted
on the Property requiring SCS or East West's designee be contacted prior to any
excavation. Phone numbers for SCS or East West's designee will be provided on the signs.
SCS or East West's designee will also notify the Commission of Public Works of die City
of Charleston and South Carolina Electric and Gas after closing on the Property and inform
them that no excavation is to take place at the Property without written permission from
East West.

6.2	DURING REDEVELOPMENT

During redevelopment activities, workers will be present, and we do not anticipate
unpermitted or unsolicited soil excavation to occur. However, any unpermitted or
unsolicited subsurface soil excavation occurring during redevelopment will be documented
intheSER.

6.3	AFTER REDEVELOPMENT

Upon completion of redevelopment, over ninety percent of the Property's surface will be
covered with either pavement or structures and the balance will be landscaped. The only
opportunity for unpermitted or unsolicited soil excavation would likely be limited to weak
by utilities. The low concentrations of constituents detected in the soil at the Property and
the risk calculations included in Appendix C indicate exposure risks to workers conducting
such work would be insignificant

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