OLD WILMINGTON ROAD GROUNDWATER CONTAMINATION SUPERFUND SITE OPERABLE UNIT 1 WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA $ A % J \ PROlt0 INTERIM RECORD OF DECISION United States Environmental Protection Agency Region 3 1600 John F. Kennedy Boulevard Philadelphia, PA 19103-2852 April 2023 ------- OLD WILMINGTON ROAD GROUNDWATER CONTAMINATION SUPERFUND SITE OPERABLE UNIT 1 WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA INTERIM RECORD OF DECISION Table of Contents DECLARATION 1 DECISION SUMMARY 4 I. SITE NAME, LOCATION, AND DESCRIPTION 4 II. SITE HISTORY AND ENFORCEMENT ACTIVITIES 5 III. HIGHLIGHTS OF COMMUNITY PARTICIPATION 7 IV. SCOPE OF THE SELECTED REMEDY 7 V. SITE CHARACTERISTICS 8 A. Hydrology 8 B. Geology 8 C. Groundwater 9 D. Water Supply 10 VI. CURRENT AND POTENTIAL FUTURE LAND AND RESOURCE USES 10 VII. SUMMARY OF SITE RISKS 10 A. Human Health Risk Assessment Summary 10 B. Summary of Ecological Risk Assessment 16 VIII. REMEDIAL ACTION OBJECTIVES 16 IX SUMMARY OF REMEDIAL ACTION ALTERNATIVES 17 X COMPARATIVE ANALYSIS OF ALTERNATIVES 22 A. Criteria Used to Compare Cleanup Alternatives 22 B. Detailed Analysis of Proposed Remedial Alternatives 23 XI. SELECTED REMEDY 27 A. Summary of the Rationale for the Selected Remedy 28 ------- B. Summary of the Estimated Costs 28 C. Performance Standards 28 D. Expected Outcome of the Selected Remedy 29 XII. STATUTORY DETERMINATIONS 29 A. Compliance with Applicable or Relevant and Appropriate Requirements 29 B. Cost Effectiveness 30 C. Utilization of Permanent Solutions and Alternative Treatment Technologies to the Maximum Extent Practicable and Preference for Treatment as a Principal Element 30 D. Five Year Review Requirements 30 E. Documentation of Significant Changes 30 XIII. RESPONSIVENESS SUMMARY 31 APPENDICES APPENDIX A - ADMINISTRATIVE RECORD INDEX APPENDIX B - RESPONSIVENESS SUMMARY APPENDIX C - ARARs AND TBCs FOR SELECTED REMEDY APPENDIX D - PERFORMANCE STANDARDS FOR RESIDENTIAL WELL WATER APPENDIX E - CLEANUP LEVELS FOR VAPOR INTRUSION APPENDIX F - RAGS PART D TABLES APPENDIX G - PADEP CONCURRENCE LETTER ------- INTERIM RECORD OF DECISION OLD WILMINGTON ROAD GROUNDWATER CONTAMINATION SUPERFUND SITE OPERABLE UNIT 1 DECLARATION The Site is located in West Cain Township, Chester County. The Site was placed on the National Priorities List (NPL) on February 4, 2000. The National Superfund Database Identification Number is PAD981938939. The Site consists of four investigation areas and three inter-connected plumes of contaminated groundwater. The Site investigations areas are as follows: • Investigation Area 1 (Area 1) includes a junkyard located on Old Wilmington Road, across the street from Investigation Area 4. • Investigation Area 2 (Area 2) is located at the end of Donovan Drive and includes an inactive former landfill. • Investigation Area 3 (Area 3) is located right next to Area 1, on Old Wilmington Road, and includes two stone-filled trenches present on the northwestern edge of the property where liquid wastes were allegedly disposed. • Investigation Area 4 (Area 4) is located on the east side of Old Wilmington Road, across the street from Area 1. This investigation area includes a truck yard which was identified as a possible source of groundwater contamination. The three inter-connected plumes of contaminated groundwater consist of the following contaminants of concern (COCs): • A plume predominantly consisting of tetrachloroethene (PCE); • A plume predominantly consisting of trichloroethene (TCE); and • A plume predominantly consisting of 1,4-Dioxane. Various inorganic COCs are also present at the Site. Statement oLBasJ^-am< Pnrnos? For management of the remedial action, EPA has organized the Site cleanup into two Operable Units (OlJs): • Operable Unit One (OU-1) is defined by the contaminated groundwater used as drinking water and volatile organic compound (VOC)-contaminated vapors attributable to the Site-related groundwater plumes with the potential to migrate from subsurface into residential indoor air 1 ------- • Operable Unit Two (OU-2) is defined by the remaining Site-related contamination in soils and groundwater. This decision document presents an Interim ROD for an interim remedial action (Selected Remedy) that addresses OU-1. The Selected Remedy was chosen in accordance with the requirements of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), as amended, and, to the extent practicable, the National Oil and Hazardous Substances Pollution Contingency Plan (NCP), 40 C.F.R. Part 300. This decision document explains the factual and legal basis for the Selected Remedy for OU-1 at the Site. This ROD is based on the Administrative Record (AR) for the Site, which was developed in accordance with Section 113 (k) of CERCLA, 42 U.S.C. § 9613(k). This AR file is available for review online at https://semspub.epa.gov/src/collection/03/AR67242, at the EPA Region 3 Records Center in Philadelphia, Pennsylvania, and at Coatesville Area Public Library in Coatesville, Pennsylvania. The AR file Index (Appendix A) identifies each document contained in the AR file upon which the selection of the remedy is based. The signed ROD will become part of the AR for the Site. The Pennsylvania Department of Environmental Protection (PADEP) concurs with the Selected Remedy for OU-1. Assessment of the Site The Selected Remedy in this Interim ROD is necessary to protect the public health or welfare or the environment from actual or threatened releases of hazardous substances into the environment. Description of the Selected Remedy The Selected Remedy for OU-1 addresses exposure to Site-related groundwater contamination in residential drinking water wells as well as vapor intrusion (VI) at affected or potentially affected properties. EPA has delineated the extent of the PCE, TCE and 1,4-Dioxane plumes and identified an "area of concern" (AOC) which includes properties impacted or potentially impacted by Site-related COCs. The AOC comprises the area overlying the groundwater plumes and investigation areas as well as a buffer area around the plumes. The extent of the buffer area will be determined during the remedial design. A future decision document will address remaining contamination, including inorganics, present in soils and groundwater at the Site for both OU-1 and OlJ-2. The Selected Remedy for OU-1 consists of a public water line, VI mitigation systems, institutional controls (ICs), and long-term monitoring (LTM). The estimated present value of total costs over a 30-year period for this remedial action is $7,786,000. Statutory Determinations The Selected Remedy is protective of human health and the environment, complies with Federal and State requirements that are legally applicable or relevant and appropriate to the remedial action, is cost-effective, and utilizes permanent solutions to the maximum extent practicable. Because this Selected Remedy will result in hazardous substances remaining on-Site above levels that allow for unlimited use and unrestricted exposure, a review will be conducted within five years after commencement of the Selected Remedy to ensure that the remedy continues to provide adequate protection of human health and the environment. Such reviews will be conducted a minimum of every 2 ------- five years thereafter, until EPA determines that hazardous substances remaining at the Site do not prevent unlimited use and unrestricted exposure at the Site. Authorizing Signature This Interim ROD documents the Selected Remedy for OU-1 of the Site. EP A selected this interim remedial action with the concurrence of the P ADEP. Digitally signed by PAUL PAUL LEONARD LEONARD Date: 2023.04.14 11:47:21 -04 00' Paul Leonard. Director Date Superfund and Emergency Management Division EPA Region 3 3 ------- INTERIM RECORD OF DECISION OLD WILMINGTON ROAD GROUNDWATER CONTAMINATION SUPERFUND SITE OPERABLE UNIT 1 DECISION SUMMARY I SITE NAME, LOCATION, AND DESCRIPTION The Site is located in West Cain Township, Chester County. The Site was placed on the National Priorities List (NPL) on February 4, 2000. The Site consists of four investigation areas and three inter-connected plumes of contaminated groundwater. The Site investigations areas are as follows: • Investigation Area 1 includes a junkyard located on Old Wilmington Road, across the street from Investigation Area 4. • Investigation Area 2 is located at the end of Donovan Drive and includes an inactive former landfill. • Investigation Area 3 is located right next to Area 1, on Old Wilmington Road, and includes two stone-filled trenches present on the northwestern edge of the property where liquid wastes were allegedly disposed. • Investigation Area 4 is located on the east side of Old Wilmington Road, across the street from Area 1. This investigation area includes a truck yard which was identified as a possible source of groundwater contamination. Figure 1: Site Map ------- The three inter-connected plumes of contaminated groundwater consist of the following contaminants of concern (COCs): • A plume predominantly consisting of tetrachloroethene (PCE); • A plume predominantly consisting of trichloroethene (TCE); and • A plume predominantly consisting of 1,4-Dioxane. Various inorganic COCs are also present at the Site. Figure 2: Plume Extent i •. v - , End of proposed ¦ Water Main United States Environmental Protection Agency Legend GROUNDWATER PLUME MAP PCE, TCE AND 1.4-DIOXANE OLD WILMINGTON ROAD SITE SADSBURYVILLE. PENNSYLVANIA ' Proposed Water Main Tetrachloroethene (PCE) Piume [Trichloroethene (TCE) Plume i 1.4-Dioxane Plume The National Superfund Database Identification Number for the Site is PAD981938939. EPA Region 3 is the lead agency for the Site, and PADEP is the support agency. It. SITE HISTORY AND ENFORCEMENT ACTIVITIES The Site has been the subject of numerous past investigations as a result of multiple complaints of waste disposal that were investigated by the Chester County Health Department (CCHD) and the Commonwealth of Pennsylvania during the 1970s and 1980s. Records indicate that a waste disposal permit was never applied for, while eyewitness accounts additionally reported that tanker trucks were observed discharging their contents onto the ground adjacent to the landfill, among other areas. Aerial photographs show mounded material on the landfill sometime between 1975 and 1980. Area 2 subsequently became the subject of a Pennsylvania Department of Environmental Resources (PADER), now known as PADEP, preliminary 5 ------- assessment in December 1986. In 1988, 1 1 residential wells were sampled by EPA as part of a Site Investigation (referred to hereafter as 1988 Phillips Landfill SI). Residential well sampling data collected during the 1988 Phillips Landfill SI indicated that the residential well located on the junkyard site (Area 1) and several other nearby wells, including the well system that provides drinking water to the residents of the mobile home park, were contaminated with TCE and PCE, both of which are volatile organic compounds (VOCs), at concentrations exceeding their respective maximum contaminant levels (MCLs). Subsequent sampling conducted by PADEP confirmed the presence of VOC contamination in the public water supply system for the mobile home park which was subsequently determined to be impacted by Area 1. In November 1992, sampling and inspection of the public water supply system for the mobile home park was conducted. Laboratory results indicated that the mobile home park supply well and a nearby residential well contained VOCs above applicable MCLs, and the concentration of PCE in the residential well exceeded the EPA removal action level. EPA initiated a removal site assessment on February 26, 1993. Based on the results of this assessment, EPA determined that there was an immediate and significant threat to human health due to elevated concentrations of hazardous substances, including PCE and TCE, in the drinking water supplies of nearby residents. On December 21, 1993, EPA commenced a removal action, which focused on providing bottled water, and later carbon filtration units, to residences affected by groundwater contamination above MCLs. In 1993, EPA also issued an emergency order to the owner/operator of the mobile home park under the Safe Drinking Water Act, requiring, among other things, that the owner/operator provide free bottled water to the mobile home park residents until a drinking water treatment system and other necessary improvements to the park's water system were installed. In 1996 Perry and Jeanne Phillips, doing business as Phillips Mobile Home Park, entered into a Partial Consent Decree (1996 Decree) with the U.S. and PADEP, requiring construction of various water treatment system improvements for the park's residential water supply as well as delineated sampling and reporting requirements. As part of the ongoing removal action, EPA also began investigating the source of the groundwater contamination. Laboratory analytical results from soil gas, soil, and groundwater sampling indicated that an additional and separate source of VOC contamination existed in Area 3. Those results confirmed eyewitness reports of separate waste dumping in Area 3 and prompted EPA to identify the area as a potential hazardous waste site on March 1 1, 1994. Based on these results, EPA investigated Area 3 separately, which confirmed that two distinct types of groundwater contaminants were present in separate plumes. On May 4, 1994, EPA approved a request for additional funding to mitigate potential risks posed to residents via ingestion of groundwater contamination and inhalation of vapors emanating from the areas adjacent to Investigation Area 1. The May 1994 approval provided for continued response actions initiated during the ongoing removal activities at the Site, including providing whole-house water treatment units to residents with VOC contamination above removal action levels; determining the area of origin of the VOC contamination in order to mitigate the source and characterize the plumes; and providing for continued monitoring and maintenance of whole-house water treatment units to ensure safe drinking water. Subsequent to the Site being added to the NPL in 2000, Remedial Investigation (RI) activities were initiated and consisted of: (1) Hydrogeologic Investigation, (2) Source Area Assessment, (3) Surface Water/Sediment Assessment, and (4) Ecological Characterization. An RI report (2010 RI) was prepared in 2010. Review of 6 ------- the 2010 RI report indicated significant data gaps, primarily caused by analysis of only a limited well network due to limited Site access. As a result, in order to further study groundwater contamination at the Site, EPA initiated the Supplemental RI, which was completed in 2022. This supplemental investigation included performing a baseline round of sampling of all historic wells and stream sampling locations, installation of new wells at the Site, additional rounds of groundwater sampling, a Site-wide residential sampling event, and a VI sampling event at homes overlying the plumes. The study found, among other things, that the groundwater is also contaminated with 1,4-Dioxane, a semivolatile organic compound (SVOC); elevated concentrations of metals were primarily contained in samples from wells not affected by VOC contamination; VOC contamination is present at all four investigation areas; and sub-slab soil gas detections of Site-related substances at several residences indicated possible contaminant migration from groundwater. In summary, the Supplemental RI concluded that groundwater contamination at the Site presents unacceptable risks to drinking water supplies and subsurface vapors that may affect residential indoor air. In 2022, EPA developed a Focused Feasibility Study (FFS) for the Site. The remedial alternatives presented in the FFS were evaluated by EPA and a Preferred Alternative was proposed in the Proposed Remedial Action Plan (Proposed Plan) in September 2022. During the public comment period for the Proposed Plan, EPA obtained new monitoring well and residential well data on per- and polyfluoroalkyl substances (PFAS) at the Site. EPA continues to investigate PFAS at the Site and will consider this information in future decision documents. III. HIGHLIGHTS OF COMMUNITY PARTIC IPATION Pursuant to Section 113(k)(2)(B) of CERCLA, 42 U.S.C. § 113(k)(2)(B), the Supplemental RI and FFS reports, the Proposed Plan, and other documents relating to the OU-1 were released to the public for comment on September 28, 2022. These documents were made available to the public online at https://semspub.epa.gov/src/collection/03/AR67242, in the EPA Administrative Records Room at EPA's Region 3 office, and in the Coatesville Area Public Library in Coatesville, Pennsylvania. The notice of availability of these documents was published in the Daily Local News and a fact sheet detailing the Proposed Plan was mailed to local citizens on September 28,2022. A public comment period was held from September 28, 2022 until October 28, 2022. During the public comment period, EPA received both written and oral comments and has responded to the comments in the Responsiveness Summary section, which is included as part of this Interim ROD. EPA held a public meeting at the Wagontown Fire Company, located at 412 W. Kings Highway, Coatesville, PA 19320, on October 1 1, 2022. During the public meeting, EPA gave a formal presentation on EPA's Proposed Plan, followed by a "Question and Answer" session where representatives from EPA answered questions regarding the Site and the Proposed Plan. Responses to all significant comments recei ved during the public comment period, including those raised at the public meeting, are provided in the Responsiveness Summary (Appendix B). IV. SCOPE OF THE SELECTED REMEDY Several privately owned residential wells are known to be contaminated with Site-related contamination. To eliminate the risk to residents whose wells are impacted by the Site, current residential water supply systems 7 ------- contaminated with Site-related contaminants have been equipped with carbon treatment systems. While these wells are provided with treatment, other wells in the area, especially those that currently lie in or adjacent to the groundwater contamination plumes, have the potential to be impacted by Site-related contaminants in the future. This Interim ROD for OU-1 provides a permanent remedy (Selected Remedy) to prevent the exposure of affected or potentially affected properties to Site-related groundwater contamination in residential drinking water wells, which also causes VI concern. EP A has delineated the extent of the PCE, TCE, and 1,4-dioxane plumes, which have stabilized, and identified an "area of concern" (AOC) which includes properties impacted or potentially impacted by Site-related COCs. The AOC comprises the area overlying the plumes and investigation areas as well as a buffer area around the plumes (see Figure 3). The extent of the buffer area will be determined during the remedial design. Additionally, the Selected Remedy is more protective of human health because installation of a water line would permanently eliminate exposure to contaminated groundwater as a drinking water source and protect against potential emerging contaminants, such as PFAS. Future decision documents will address potential emerging contaminants and remaining contamination present in soils and groundwater at the Site, for both OU-1 and OU-2. V. SITE C HARAC TERISTIC S The topography of the area slopes gently from the northwest to southeast across the Site. Large portions of the Site are relatively flat-lying, likely from grading associated with construction and agriculture. There are a number of steep slopes on the Site which are located immediately adjacent to streams, tributaries, property lines, and ditches. A. Hydrology The major surface water bodies at the Site are Rock Run, the unnamed surface water body located in the vicinity of Ash Road, and two unnamed tributaries (one to Rock Run and one to Buck Run). Rock Run flows along the northern and eastern boundaries of the Site from the northwest to the southeast, past a small pond located along the southeastern side of Ash Road. Runoff from Investigation Areas 1, 3, and 4 flows southeast toward Rock Run and its unnamed tributary to the south. Overland runoff is collected in a network of small creeks and swales, and numerous drainage ditches along roadways. Runoff from Area 2 drains to an unnamed wetland south of Karen Circle. B. Geology The Site lies in the Piedmont Physiographic Province, an area underlain by highly deformed metamorphosed sedimentary rocks, which have been intruded by younger igneous rock bodies. The Mine Ridge formation is the predominant surface geologic formation in the area, which is found to the south and east of the Site where it contacts the major rock types found at the Site - Chickies Quartzite and the Baltimore Gneiss. Other secondary rock formations in the area include serpentinite and pegmatite. The Chickies Quartzite is a Late Pre-Cambrian to Cambrian-aged granular quartzite with interbedded quartzose schist. The Chickies encompasses much of the Site and surrounding area. The permeability of the Chickies Quartzite is generally much lower than that of the Mine Ridge or Baltimore Gneiss. Most water from this formation is obtained from the fractured weathered zone at the top of bedrock. The formation is difficult to drill, except in areas where it is heavily weathered. The Baltimore Gneiss (often referred to as "undifferentiated gneiss") is a Cambrian-aged foliated metamorphic rock in which bands of granular 8 ------- minerals alternate with bands of elongate or prismatic minerals, making the rock appear layered. In some areas, igneous intrusions (pegmatite, gabbro) cause the rock to vary from banded gneiss to a massively textured igneous rock. The permeability of the Baltimore Gneiss is generally much higher than that of the Chickies Quartzite. C. Groundwater Rock type can significantly affect contaminant transport and groundwater flow velocity, patterns, and fate and transport. The Mine Ridge Gneiss and the Chickies Quartzite formation are separated by a thrust fault which bisects the Site. This fault represents the contact between rocks of the Chickies Quartzite and the Mine Ridge Gneiss. In this thrust fault, older rocks of the Mine Ridge Gneiss were pushed over younger rocks of the Chickies Quartzite. This thrust fault is significant to Site characterization because it is believed to be a major controlling influence on contaminant migration and groundwater flow. Along with the thrust fault identified on the Site, a network of smaller fractures (joints) was identified. When these fractures become saturated with groundwater, they form a pattern of permeability that results in preferential contaminant transport and groundwater flow. These joint-related fractures represent a distortion of normal groundwater flow and can produce preferred contaminant transport and groundwater flow pathways along a network of fractures. Groundwater flow at the Site occurs vertically. The shallowest two groundwater zones encountered, which would represent the overburden aquifer and the first bedrock aquifer, are strongly connected, likely with only minimal confinement between the two, providing a pathway for downward contaminant migration. Groundwater flow direction at the Site is generally eastward, with isolated depressions likely caused by localized pumping of private drinking water wells. Measurements of water levels, observations of geology, and analytical results indicate, however, that groundwater flows primarily through secondary porosity such as fractures and faults, rather than through the primary porosity of the formations. Groundwater discharges to the surface bodies at the Site and provides base flow to the stream system of Rock Run, Buck Run, and their tributaries. Finally, groundwater modeling indicates that, in general, groundwater flow originates northwest of the Site at the topographic high near Debbie Drive, with groundwater from Investigation Areas 1, 3, and 4 flowing east-northeast toward the houses along Ash Road. Modeling of groundwater flow paths from Area 2 (the landfill) indicates that groundwater and contaminants would flow generally southward. Available data show that groundwater at the Site has been impacted by more than one source area. Investigation Areas 1, 3, and 4, and, to a much lesser extent. Investigation Area 2. Site groundwater contains VOCs, 1,4-Dioxane, and some metals (see Appendix D for list of COCs). Migration of COCs and their breakdown products in groundwater has been documented both horizontally and vertically in the aquifer systems. VOCs, specifically PCE and TCE, that are dissolved in the groundwater can volatilize into the vapor phase. PCE and TCE can readily volatilize at the water table because of their relatively high partial pressure. These vapors can then migrate towards the ground surface. While the direction of vapor movement can be difficult to predict, soil vapor investigations conducted at the Site have shown that PCE and TCE may accumulate underneath the basement slabs of residential structures in the AOC. The PCE and TCE vapors can then 9 ------- migrate through preferential pathways that include cracks in the basement slab or walls and enter the residential structure. This occurrence is referred to as vapor intrusion. D. Water Supply Most of the residences within the Site use groundwater from private drinking water wells for domestic purposes. At least 60 drinking water wells supply water to residences and businesses within the Site. Water wells, including residential, and monitoring wells, are regulated by Chester County under a permitting process. Homes in the mobile home park adjacent to the Investigation Area 2 landfill are supplied with water from a common production well on the property at Investigation Area 1. Water from this common well is contaminated and receives treatment prior to distribution pursuant to the previously discussed 1996 Decree. Public water is available in an area northeast of the Site. An 8-inch-diameter water line, owned and operated by Pennsylvania American Water Company, runs along Airport Road. Public water supplies are regulated and permitted by Pennsylvania's Safe Drinking Water Program. VI. CURRENT AND POTENTIAL FUTURE LAND AND RESOURCE USES The ma jority of the land use is agricultural and wooded, however, residential space and commercial facilities also exist in the vicinity of the Site. The highest concentrations of residences are located west of Old Wilmington Road and along Ash Road. Wooded tracts of land, including stream buffers and undeveloped properties, are found throughout the Site, with the largest wooded area located west of the landfill. The agricultural properties at the Site lie to the south and west of Ash Road. The aquifer is the current source of drinking water for the community. The four investigation areas are currently privately owned and either inactive or used for various commercial uses. The land use controls associated with the Selected Remedy (see selected ICs) will be consistent with current and any future land use of the Site properties. VII. SUMMARY OF SITE RISKS A. Human Health Risk Assessment Summary Human health risk assessments (HHRA) were completed in 2010, as part of the 2010 RI, in 2019, and in 2022 as part of the Supplemental RI to re-evaluate the potential threat to human health associated with the release or potential release of COCs from the Site. Results of the 2022 HHRA were used to identify affected media, COCs, and potential exposure pathways that may result in unacceptable human health risks. Appendix F includes a summary of the receptors with risk estimates exceeding risk management benchmarks under the reasonable maximum exposure (RME) scenario. The results of the updated risk evaluations are summarized in Table 1 and provided in the Risk Assessment Guidance for Superfund (RAGS) Part D Table 10s (Appendix F), which present the updated calculations of chemical cancer risks and non-cancer hazards. Identification of Chemicals of Concern 10 ------- In general, a chemical is selected as a contaminant of potential concern (COPC) and retained for further quantitative risk evaluation if the maximum detection in a sampled medium exceeds the lowest risk-based concentration (RBC). Chemicals eliminated from further evaluation are assumed to present minimal risks to potential human receptors. The analytical data for soil, groundwater, surface water, and sediment were screened against EPA Regional Screening Levels (RSLs) to determine which substances were required for quantitative risk calculation. Sub-slab soil gas substances were screened against EPA Vapor Intrusion Screening Levels (VISLs). CO PCs were selected for surface soil, subsurface soil, groundwater, surface water, and sediment using the risk-based CO PC screening levels. Exposure point concentrations (EPCs) were calculated for surface soil, combined surface/subsurface soil, groundwater, and sediment. No CO PCs were identified for surface water, therefore EPCs were not calculated for surface water. The evaluation of vapor intrusion risks for specific homes was based on indoor air and sub-slab sample concentrations. Exposure Assessment A conceptual site model (CSM) facilitates consistent and comprehensive evaluation of potential risks to human health by creating a framework for identifying the pathways by which human receptors may contact environmental media contaminated by site activities. The exposure assessment portion of the risk assessment defines and evaluates the type and magnitude of human exposure to the chemicals present at or migrating from a site. Based on current and potential future land use at the site, construction workers, industrial workers, and residents were identified as potential receptors. Groundwater within the study area is used as a drinking water source and several surveys have been conducted to identify residential wells within the study area that may be impacted by the groundwater contaminant plume. Construction workers could be exposed to soil via ingestion, dermal contact, and inhalation and to shallow groundwater via ingestion, dermal contact, and inhalation. Industrial workers could be exposed to soil via ingestion, dermal contact, and inhalation, to groundwater if used as a potable source via ingestion, dermal contact, and inhalation, and to VOCs migrating from a subsurface source. Residential receptors could be exposed to soil via ingestion, dermal contact, and inhalation, to groundwater if used as a potable source via ingestion, dermal contact, and inhalation, and to VOCs migrating from a subsurface source. To provide a full characterization of potential exposure, both RME and central tendency exposures (CTE) were evaluated in the HHRA. Exposure to lead was assessed using the following models: • The latest version of EPA's Integrated Exposure Uptake Biokinetic (IEUBK) Model for lead (version 1.1 Build 11). This model is typically used to evaluate lead exposure assuming a residential land use scenario. • EPA's Adult Lead Methodology (2003b and 2017). This methodology is typically used to evaluate lead exposure assuming a non-residential land use scenario. The IEUBK Model for lead is designed to estimate blood levels of lead in children (under 7 years of age) based on either default or site-specific input values for air, drinking water, diet, dust, and soil exposure. Studies indicate that infants and young children are extremely susceptible to adverse effects from exposure 11 ------- to lead. Considerable behavioral and developmental impairments have been noted in children with elevated blood-lead levels. Historically blood-lead levels greater than 10 micrograms per deciliter (|.ig/dL) were considered to be a "concern." Current scientific literature on lead toxicity indicates that adverse health effects are associated with blood-lead (PbB) levels below the long-held target of 10 (.ig/dL. Specifically, evidence exists of clear cognitive declines in young children with PbB levels between 2 and 8 |.ig/dL (as referenced in the December 2016 EPA Office of Land and Emergency Management [OLEM] Memo). Therefore, a value of 5 ug/dL was used as the acceptable blood lead level in this HHRA. The exposure factors used to estimate intake for the construction worker, industrial worker, and resident are presented and defined in RAGS Part D Tables in Appendix F. Toxicity Assessment The toxicity assessment weighs the evidence regarding the potential for exposure to chemicals to produce adverse effects in exposed receptors and, when possible, the assessment estimates the relationship between the exposure to a chemical and the increased likelihood and/or severity of adverse effects. Quantitative estimates of the relationship between the magnitude and type of exposures and the severity or probability of human health effects are defined for the identified COPCs. Quantitative toxicity values determined during this component of the risk assessment are integrated with exposure assessment outputs to characterize the potential occurrence of adverse health effects for each receptor group. The reference dose (RfD) is the toxicity value used to evaluate noncarcinogenic health effects for ingestion and dermal exposures. The reference concentration (RfC) is used to evaluate noncarcinogenic health effects for inhalation exposures. The RfD and RfC estimate a daily exposure level for a human population that is unlikely to pose an appreciable risk during a portion or for all of a human lifetime. It is based on a review of animal and/or human toxicity data with adjustments for various data uncertainties. Carcinogenic effects are quantified using the cancer slope factor (CSF) for ingestion and dermal exposures and using inhalation unit risks (IUR) for inhalation exposure that are plausible upper bound estimates of the probability of the development of cancer per unit intake of the chemical over a lifetime. Oral RfDs and CSFs and inhalation RfCs and IlJRs used in this HHRA were obtained from the following primary EPA recommended literature sources using following hierarchy (EPA, 2003c): • Tier 1 - Integrated Risk Information System (IRIS). • Tier 2 - EPA Provisional Peer Reviewed Toxicity Values (PPRTVs) - The Office of Research and Development/National Center for Environmental Assessment (NCEA) Superfund Health Risk Technical Support Center develops PPRTVs on a chemical-specific basis when requested by EPA's Superfund program. • Tier 3 - Other Toxicity Values - These sources include but are not limited to California Environmental Protection Agency (Cal EPA) toxicity values. Agency for Toxic Substances and Disease Registry ( ATSDR) values, and the Health Effects Assessment Summary Tables (HEAST). Toxicological data for the COPCs, including non-carcinogens and carcinogens, are presented in RAGS Part D Table 5.1 and Table 5.2 for non-carcinogenic effects and in RAGS Part D Table 6.1 and Table 6.2 for carcinogenic effects (Appendix F). Risk Characterization 12 ------- Quantitative estimates of noncarcinogenic and carcinogenic risks (His and incremental lifetime cancer risk (ILCRs), respectively) were developed for potential human receptors contacting site environmental media (Appendix F). For carcinogens, risks are generally expressed as the incremental probability of an individual's developing cancer over a lifetime as a result of exposure to the carcinogen. Excess lifetime cancer risk is calculated from the following equation: Risk = GDI x SF where: risk = a unitless probability (e.g., 2 x 10-5) of an individual's developing cancer GDI = chronic daily intake averaged over 70 years (mg/kg-day) SF = slope factor, expressed as (mg/kg-day)-1. These risks are probabilities that usually are expressed in scientific notation (e.g., lxl0"6). An excess lifetime cancer risk of lxlO"6 indicates that an individual experiencing the reasonable maximum exposure estimate has a 1 in 1,000,000 chance of developing cancer as a result of site-related exposure. This is referred to as an "excess lifetime cancer risk" because it would be in addition to the risks of cancer individuals face from other causes such as smoking or exposure to too much sun. The chance of an individual's developing cancer from all other causes has been estimated to be as high as one in three. EPA's generally acceptable risk range for site-related exposures is 10"4 to 10"6. The potential for noncarcinogenic effects is evaluated by comparing an exposure level over a specified time period (e.g., life-time) with a RfD derived for a similar exposure period. An RfD represents a level that an individual may be exposed to that is not expected to cause any deleterious effect. The ratio of exposure to toxicity is called a hazard quotient (HQ). An HQ<1 indicates that a receptor's dose of a single contaminant is less than the RfD, and that toxic noncarcinogenic effects from that chemical are unlikely. The Hazard Index (HI) is generated by adding the HQs for all chemical(s) of concern that affect the same target organ (e.g., liver) or that act through the same mechanism of action within a medium or across all media to which a given individual may reasonably be exposed. An HI< 1 indicates that, based on the sum of all HQ's from different contaminants and exposure routes, toxic noncarcinogenic effects from all contaminants are An HI > 1 indicates that site-related exposures may present a risk to human health. The HQ is calculated as follows: Non-cancer HQ = CDI/RfD where: GDI = Chronic daily intake RfD = reference dose. GDI and RfD are expressed in the same units and represent the same exposure period (i.e., chronic, subchronic, or short-term). Table 1 presents a summary of the receptors with risk estimates exceeding risk management benchmarks under the RME scenario. Under the RME scenario for current and future land use, cumulative ILCRs for future lifelong residents exceed the acceptable cancer risk of lxlO"4. Benzo(a)pyrene, dieldrin, naphthalene, and arsenic in surface/subsurface soil; and chloroform, PCE, TCE, vinyl chloride, 1,4-dioxane, BEHP, and arsenic in groundwater were the contributors to the ILCR for the future lifelong residents. 13 ------- Table 1: Summary of Health Risks for Reasonable Maximum Exposures Ki-i r|)liii-> i m IT H i Current Industrial Workers Surface Soil 3E-06 None 0.2 I ¦Tone Current Child Residents Surface Soil (see lifetime) - 3(3) None Sediment (see lifetime) - 0.3 None Total (see lifetime) - 3(3) - Current Adult Residents Surface Soil (see lifetime) - 0.3 None Sediment (see lifetime) -- 0.04 None Total (see lifetime) - 0.3 -- Current Lifelong Residents Surface Soil 2E-05 None NA -- Sediment NC<4) -- NA -- Total 2E-05 - NA - Combined 6E-07 None Aluminum, Surface/Subsurface Soil Manganese Workers Groundwater 4E-07 None 3 Trichloroethene Total 1E-06 - 5 - Future Industrial Workers Combined Surface/Subsurface Soil 3E-06 None 0.3 None Groundwater 8E-05 None 7 Aluminum, Cobalt, Manganese Total 9E-05 -- 7 -- Combined Surface/Subsurface Soil (see lifetime) - 5 Cobalt, Copper, Iron, Manganese, Thallium Tetrachloroethene, Trichloroethene, Future Child Resident Groundwater (see lifetime) - 31 Caprolactam, 2- Hexanone, Aluminum, Arsenic, Cobalt, Iron, Lead, Manganese, Thallium Sediment (see lifetime) - 0.3 None Total (see lifetime) -- 36 -- Combined Surface/Subsurface Soil (see lifetime) - 0.5 Thallium Tetrachloroethene, Trichloroethene, 2- Future Adult Residents Groundwater (see lifetime) — 23 Hexanone, Aluminum, Arsenic, Cobalt, Iron, Manganese, Thallium Sediment (see lifetime) -- 0.04 None Total (see lifetime) - 23 - Combined Surface/Subsurface Soil 1E-05 Benzo(a)pyrene, Dieldrin, Naphthalene, Arsenic NA - Chloroform, T etrachloroethene, Future Lifelong Residents Groundwater 3E-04 Trichloroethene, Vinyl Chloride, 1,4- Dioxane, Bis(2- ethylhexyl)phthalate, Arsenic NA - Sediment NC<4) - NA - Total 3E-04 - NA - 14 ------- Lifelong Residents Groundwater (Vapor Intrusion) 6E-05 ( lllllilllllllillllN III ( (IIKITI1 III Risk' 1 Chloroform, T etrachloroethene, Trichloroethene, Vinyl Chloride 1 - A chemical is considered to a major contributor to the cancer risk if the cumulative cancer risk is greater than lxlO"4 and the chemical specific cancer risk is greater than lxlO"6. 2 - A chemical is considered to be a major contributor to the hazard index if the cumulative target organ hazard index is greater than 1 and the chemical specific hazard index is greater than 0.1. 3 - Target organs HE less than 1. 4 - NC - No carcinogenic COPCs were identified for sediment, therefore cancer risks could not be calculated. Cumulative His on a target organ basis for current industrial workers, current child residents, and current adult residents were less than the acceptable level of 1. Cumulative His for future construction workers, future industrial workers, future child residents, and future adult residents exceeded the acceptable level of 1. Exposures to aluminum and manganese in surface/subsurface soil and TCE in groundwater were the contributors to the cumulative HI for future construction workers. Aluminum, cobalt, and manganese in groundwater were the contributors to the HI for future industrial workers. Cobalt, copper, iron, manganese, and thallium in surface/subsurface soil and PCE, TCE, caprolactam, 2-hexanone, aluminum, arsenic, cobalt, iron, manganese, and thallium were the contributors to the HI for future child residents. Thallium in surface/subsurface soil and PCE, TCE, 2-hexanone, aluminum, arsenic, cobalt, iron, manganese, and thallium in groundwater were the contributors to the HI for the future adult resident. PCE and TCE pose the greatest potential unacceptable risk to human health at the Site due to the extent of migration Vapor Intrusion Risks from exposures to VI were calculated using two approaches. The first approach involved evaluating risks using the most recently collected groundwater samples. Assuming residential exposure, all sampling points (wells) had ILCRs less than or within EPA's target risk range. All but three sampling points had an HI less than 1. The HI exceeded one for monitoring wells MW03, MW05, and MW08S. TCE was the primary contributor to the potential VI risks at MW03 and MW08S, while PCE was the primary contributor to the potential VI risks at MW05. The second approach relied upon evaluating VI risks for specific homes based on contaminant concentrations detected during indoor air and sub-slab sampling performed in April 2019. EPA's evaluation of the results identified current unacceptable risks in one house based upon TCE concentrations detected in indoor air and sub-slab samples. The maximum TCE level reported for indoor air at this home was 2.7 micrograms per cubic meter (|ig/m3), which exceeded its EPA RSL of 0.21 [ig/m3. The TCE concentration detected in the sub-slab vapor sample (220 (ig/m3) collected at this home resulted in an HQ of 3, indicating a potential future VI risk. The sub-slab sample collected from another house contained PCE (170 (ig/m3) at a concentration that exceeded its VISL value based on an ILCR of 1 xlO"6 and an HQ of 1, indicating potential future risks from VI PCE exposure may also be of concern. However, PCE concentrations currently detected in indoor air of this home were less than the applicable screening levels. Risk from Lead 15 ------- Residential exposures to lead in soil and groundwater were evaluated using EPA's Integrated Exposure Uptake Biokinetic (IEUBK) lead model. The results of the IEUBK model indicate that risks for current child residents exposed to lead in surface soil do not exceed the EPA goal of no more than 5% of children exceeding a 5 microgram per deciliter (jig/dL) blood-lead level. However, the IEUBK model also indicates that risks to future child residents exposed to lead in both groundwater and surface/subsurface soil exceed the EP A goal; lead in groundwater was responsible for the exceedance of the benchmark for residential exposures to lead. Construction and industrial worker exposures to lead in soil were evaluated using EPA's Adult Lead Methodology. These results indicate that risks to current industrial workers and future industrial workers and construction workers do not exceed the EPA goal of no more than 5% of children (fetuses of exposed women) exceeding a 5 (ig/dL blood-lead level. B. Summary of Ecological Risk Assessment A Screening Level Ecological Risk Assessment (SLERA) was conducted as part of the 2010 RI. Surface water and sediment samples were collected and analyzed as part of the SLERA. The objective was to position sampling stations upstream/off-Site to characterize background conditions and to sample representative surface waters downstream of the Site to allow a spatial characterization of biological condition. The SLERA concluded that COCs at the Site did not pose unacceptable risks to ecological receptors, so the ecological risk assessment was not updated for the Supplemental RI completed in 2022. Ecological risk will be addressed in the ROD for OU-2. C. Summary of Site Risks In summary, the HHRA for the Site demonstrates the presence of unacceptable risk to human health, and that remedial actions are necessary to reduce the risks to within or below EPA's acceptable risk range. EPA has identified the COCs that pose the greatest potential unacceptable risk to human health and the environment at the Site. Therefore, EPA has determined that the Selected Remedy for this Interim ROD is necessary to protect the public health or welfare or the environment from actual or threatened releases of hazardous substances into the environment. VIII. REMEDIAL AC TION OBJECTIVES Remedial Action Objectives (RAOs) are specific goals developed to address the Site COCs and exposure pathways to protect human health and the environment. These objectives are based on available information and standards, such as applicable or relevant and appropriate requirements (ARARs), to-be-considered (TBC) guidance, and Site-specific risk-based levels. The RAO established for drinking water: • Prevent potential human exposure to Site-related contaminants in groundwater through ingestion above levels that pose an unacceptable risk for residential use. The RAOs established for soil vapor and indoor air: • Protect current and future residents from adverse health effects that may result from exposure to VOC-contaminated vapors attributable to the Site-related groundwater plumes. • Mitigate potential contaminant migration from subsurface VI into residential indoor air. 16 ------- EPA guidance states that "[a]n interim action is limited in scope and only addresses areas/media that also will be addressed by a final site/operable unit ROD."1 Therefore, the foregoing RAOs reflect the limited scope of this interim remedial action. By preventing human exposure to contaminated groundwater, the interim remedial action will reduce Site risks by ensuring the public is not exposed or potentially exposed to Site-related contaminants in groundwater at concentrations exceeding MCLs, PA medium-specific concentrations (MSCs), or RSLs, as appropriate. IX. SUMMARY OF REMEDIAL ACTION ALTERNATIVES The Superfund law (CERCLA) requires that any remedy selected to address contamination at a site must be protective of human health and the environment, cost-effective, in compliance with promulgated standards or requirements that are determined to be ARARs, and consistent with the NCP. The three Alternatives, as shown in Table 1, were evaluated to meet the RAOs for this interim remedial action. Table 1: Evaluated Alternatives Alternative Description 1 No Action 2 Point-of-Entry Treatment Systems (POETS), VI Mitigation Systems, ICs, and LTM 3 Public Water Line, VI Mitigation Systems, ICs, and LTM. Alternative 1: NO ACTION Consideration of this alternative is required by the NCP at 40 C.F.R. § 300.430(e)(6). Under Alternative 1, no additional remedial action would be taken at the Site. The "no action" alternative serves as a basis against which each of the other proposed remedial alternatives can be compared. Under this alternative, the Site would remain in its present condition. Current and future residents would remain exposed to Site- related contaminants in residential drinking water wells and to VOC-contaminated vapors attributable to the Site-related groundwater plumes. The potential for contaminant migration from subsurface VI into residential indoor air would remain, and existing POETs would no longer be maintained by EPA. Alternative 2: POINT-OF-ENTRY TREATMENT SYSTEMS (POETS), VI MITIGATION SYSTEMS, ICs, AND LTM POETS Under this alternative, groundwater pumped from the affected, or potentially affected, residential drinking water wells would be treated before it reaches human receptors to meet the performance standards2 for Site 1 "A Guide to Preparing Superfund Proposed Plans, Records of Decision, and Other Remedy Selection Decision Documents" (Office of Solid Waste and Emergency Response) (July 1999), at p. 8-2. 2 Generally, for a particular remedy component, performance standards define what that component must accomplish. Appendix D (Performance Standards for Residential Well Water) identifies the contaminant concentration levels that would need to be met by the POETS, if selected. For the Selected Remedy, treatment of the public water to be supplied to Site residents will be conducted off-Site by the water company. However, as discussed below, these performance standards will be utilized, along with other criteria (such as a buffer area), to determine which residences fall within the AOC—to be offered connection to the water line. See also, Section XI.C, below. 17 ------- COCs in residential wells (see Appendix D) through the use of POETS. Several residences along Ash Road and Old Wilmington Road have previously been provided with POETS where COC levels have exceeded applicable performance standards. In addition, homes within the nearby mobile home park are also provided with treated water from a single, common well pursuant to the 1996 Decree issued to the park owner/operators. Under this alternative, the residents of the mobile home park would continue to receive drinking water from the common well regulated by PADEP's Safe Drinking Water Program, and the current POETS installed by EPA would continue to be maintained until the groundwater plumes are restored to any future selected performance standards. New POETS would also be installed at locations within the AOC. For cost estimating purposes, up to a total of 60 existing and new POETS may be installed and/or maintained within the AOC, which includes residences at the Site located on Old Wilmington Road, Ash Road, Parkesburg Road, and Donovan Drive. Additional residential well sampling may be conducted to determine if additional residential wells would require a POETS to prevent users from consuming contaminated groundwater. The new POETS offered would be the same as those previously installed by EPA and currently in place at affected homes. The POETS would consist of an inline particulate filter for pre-filtering, dual in-series granular activated carbon (GAC) units for removing organic compounds, and an ultraviolet (UV) radiation unit for disinfection. To assess the effectiveness of the POETS, the systems" pre-treatment, mid-treatment and post-treatment water would be routinely monitored for VOCs, 1,4-Dioxane, and metals. Based on operation and maintenance (O&M) of existing POETS at this Site, these systems are capable of treating low concentrations of 1,4-Dioxane. Initially, all POETS installed and previously installed would be monitored on a quarterly basis. This alternative would also include periodic replacement of carbon units, pre-filter cartridge replacement, as needed, and non-routine repairs of treatment units for both existing and newly installed systems. If monitoring of the POETS indicates that performance standards are not being met by the current POETS, additional cost-effective treatment systems capable of addressing Site-related COCs in residential wells could also be installed in affected residences. However, to date, through routine monitoring, the existing systems installed at homes at this Site have been effective at removing Site-related COCs that exceed performance standards. Vapor Intrusion VI mitigation systems would be installed at residences where Site-related COC concentrations in indoor air or sub-slab vapor are detected at levels exceeding cleanup levels for VI (See Appendix E). In affected homes with a basement with concrete floors, a sub-slab depressurization (SSD) system would be installed. In homes with partial concrete, stone, or earthen floors, a combination of an impermeable vapor barrier (for the earthen floor) and an SSD system would be installed. SSD systems would not provide treatment of indoor air. EPA will determine which homes will receive VI mitigation systems using the results of previous or future VI sampling. VI confirmatory sampling would be conducted to ensure the mitigation systems are functioning properly. Alternative 2 may also include monitoring of indoor air quality at affected homes containing VI mitigation systems. In affected homes where an SSD system cannot be installed due to the home lacking a basement, indoor residential air would be treated using carbon filtration units to reduce VOC vapors. These units would be equipped with fans and GAC filters. The fan draws air through the filter, which adsorbs and removes VOC (and possibly other organic compound) vapors. Typical GAC filters would contain 15 pounds of activated carbon and would last from 9 to 12 months with filters being replaced once on an annual basis. 18 ------- Long-term Monitoring Residential drinking water wells with POETS would be monitored via a LTM program to evaluate the effectiveness of the POETS in reducing COCs to respective performance standards and to determine whether additional cost-effective treatment systems capable of addressing Site-related COCs in residential drinking water wells need to be installed in affected residences. A total of approximately 60 residential wells with POETS would be sampled quarterly and analyzed for all Site COCs, as described above. Sampling frequency would initially be performed quarterly until EPA, in consultation with PADEP, determines that sampling can be performed less frequently. LTM for VI would consist of a minimum of annual maintenance of the VI mitigation systems at affected residences. LTM may also consist of collecting air samples at the affected residences, where access is granted, to assess the performance of the VI mitigation systems, and to ensure the systems are functioning properly. Sampling frequency will initially be performed annually until EPA, in consultation with PADEP, determines that sampling can be performed less frequently. O&M would need to continue until vapors resulting from the contaminated groundwater meet cleanup levels. If additional buildings are constructed at the Site, these buildings would also be included in the LTM program annual assessments, as appropriate. Sampling results would be evaluated to assess whether there have been changes in contaminant status and whether additional response actions are warranted. Site conditions and risks would be reviewed every five years since contaminants would be left in place. Institutional Controls ICs would be implemented to prevent exposure to Site-related contaminants in groundwater by deterring the use of untreated groundwater at properties within the AOC and to restrict any impact on the Site remedy. The ICs would consist of the following: 1) deter the use of untreated groundwater for potable purposes; 2) prohibit the installation of any new groundwater wells until remediation standards and protectiveness have been achieved, unless EPA, in consultation with PADEP, gives prior written approval for such installation; and, 3) prohibit all activities that would interfere with any component of the remedial action, unless EPA, in consultation with PADEP, gives prior written approval for such activity. In addition, ICs would prevent potential indoor air exposure to Site-related COCs that may volatilize from the underlying groundwater plumes. To prevent such exposure, EPA, in consultation with PADEP, would require prior notice of any construction of new residential or other structures intended for occupancy over or within 100 feet of the contaminated groundwater plumes. The then current owner of such property would be required to submit to EPA and PADEP (and local authorities as necessary) a plan to address indoor air risk due to VI. If a new structure is constructed and it is determined that a VI mitigation system is needed, installation of the VI mitigation system will be the responsibility of the owner. To implement the ICs, a number of mechanisms, or layered mechanisms, could be utilized, in consultation with PADEP. This process would involve working with the affected property owners, and, as necessary, with local government, to implement the above activity-and-use limitations, in consultation with PADEP, through proprietary controls (e.g., environmental covenants), governmental controls (e.g., local rules/regulations, zoning ordinances or building codes), enforcement instruments (e.g., Federal or State administrative orders), and/or informational devices (e.g., letters/fact sheets to the community or property owners, deed notices, the PA Activity and Use Limitations Registry, community outreach, or advisories). For example. Chapter 500 of the Chester County Health Department Rules and Regulations, Section 501, 19 ------- contains certain restrictions on wells. These rules/regulations require persons to obtain a permit to install, maintain, or repair a water supply well; include water quality limits that must be met; restrict permitting of wells within delineated Plume Areas of contaminated sites unless approved by EPA or PADEP; and require written documentation that the installation of a well will not have any impact on the plume or remediation effort as well as requirements for water source replacement and decommissioning of wells. Alternative 3: PUBLIC WATER LINE, VI Mitigation Systems, ICs, and LTM Public Water Line Under Alternative 3, all homes within the AOC would be offered the opportunity to connect to a newly constructed public water line. This alternative would prevent exposure to Site-related COCs by providing a permanent alternative clean water supply to properties currently using drinking water wells within the area of groundwater contamination. The total number of residences to be offered connections to the water line will be determined during the design of the water line; however, for cost estimating purposes, EP A assumes that approximately 60 residences would be connected to the water line. Based on current information, the residences located on Old Wilmington Road, Ash Road, Parkesburg Road, and Donovan Drive, within the AOC for the COCs identified in this Interim ROD, as delineated in Figure 3, would be offered connections to the water line. EPA will pay for the lateral connection to the water line for the above-described properties; however, the monthly water bill, once the residence is connected, will be the responsibility of the homeowner. Lateral connections to the water line will only be offered to the affected or potentially affected residences at the time of construction of the water line; connections will not be provided after the construction of the water line has been completed. If a homeowner chooses not to connect to the water line once it becomes available and the residence has a POETS installed by EPA, EPA will not continue to monitor and maintain the POETS after construction of the water line is completed. Existing POETS for those choosing to connect to the water line would be monitored and maintained until connection to the newly constructed public water line is completed. If a resident elects to be connected to the water line, existing drinking water wells would be completely disconnected from the drinking water system. EPA will pay for disconnecting residential wells from the drinking water supply. Disconnected wells would either be decommissioned or could be used for non- potable purposes only under certain conditions as permitted by CCHD regulations. See CCHD Rules and Regulations, Chapter 500, § 501.16 (Water Source Replacements) and § 501.16.4. Continuing to use wells for non-potable uses would reduce the usage and cost of the public water supplied to the resident. If a homeowner chooses to keep their residential well for non-potable uses after connection to the water line, any required maintenance of the residential well would be the responsibility of the homeowner and the resident must comply with the requirements of the above CCHD Regulations, including submitting a written request to the CCHD for approval to continue to maintain the well and receiving written approval from CCHD to maintain the well. Additionally, a West Cain Township ordinance requires mobile home parks to connect to a water line, if one is available. As a result, the mobile home park on-Site would be connected to the water line, which would replace the common well that currently services the mobile home park. All connections to the municipal 20 ------- water system would require coordination with State authorities, local authorities, and residents. EPA currently estimates that approximately 16,530 linear feet of 8-inch pipe would be installed to serve as the water main extension. Installation of the distribution lines would require excavation along the roadways. In addition, per township ordinance, fire hydrants would be installed, one every 600 feet, along the water supply line. Public water distribution lines would be installed at least 36 inches below ground surface to prevent freezing. The actual design of the water distribution system would require an engineering evaluation to determine actual water usage, friction losses, fire protection needs, and the future growth of the service area. Figure 3: Route of Public Water Line y-f r '*¦ &S- 7 [¦ *'¦} I&r*5_ w 9 ' Iff % Vjh -j#Tie-in to Existing Water Main fjL m "/ M: iL ; - ¦ ' r Legend I I Area of Concern G Fire Hydrant Existing Water Main Proposed Water Main I i Study Areas & ( I: I I §33 Jtf Mr PROPOSED WATER MAIN EXTENSION PREFERRED ALTERNATIVE OLD WILMINGTON ROAD SITE SADSBURYVILLE, PENNSYLVANIA Vapor Intrusion This component is identical to the VI component described for Alternative 2. Long-term Monitoring A public water line does not require LTM because public water is routinely sampled by the water provider and regulated under applicable laws and regulations. LTM of the VI mitigation systems is identical to the LTM described for Alternative 2. Site conditions and associated risks would be reviewed every five years as part of the five-year review process because contaminants would be left in place. 21 ------- Institutional Controls This component is identical to the ICs described for Alternative 2. Common Elements of Alternatives 2 and 3 Common components for Alternatives 2 and 3 are as follows: • Installation of VI mitigation systems at residences where concentrations of Site contaminants are detected in indoor air and/or sub-slab vapor at levels exceeding acceptable EPA risk levels and PADEP screening values. • LTM would assess the progress and effectiveness of remedial actions. • ICs to restrict potable use of untreated groundwater within the contaminated plume along with a prohibition on the installation of any new groundwater wells, to prohibit interference with the Site interim remedy, and to prevent exposure to Site-related COCs via VI from contaminants in the groundwater plume. • Five-year reviews to assess the implementation and performance of the remedy to ensure it remains protective. X. COMPARATIVE ANALYSIS OF ALTERNATIVES A. Criteria Used to Compare Cleanup Alternatives The remedial alternatives have been evaluated against the nine decision criteria set forth in the NCP, 40 C.F.R. § 300.430(e)(9)(iii) and listed in Table 3 below. These nine criteria are organized into three categories: threshold criteria, primary balancing criteria, and modifying criteria. Threshold criteria must be satisfied in order for an alternative to be eligible for selection. Primary balancing criteria are used to weigh major trade-offs among alternatives. Modifying criteria are formally taken into account after public comment has been received on the Proposed Plan. In the remedial decision-making process, EPA describes the relative performance of each alternative against the evaluation criteria and notes how each alternative compares to the other alternatives under consideration. A detailed analysis of alternatives can be found in the FFS, which is in the Administrative Record file for the Site. Table 2: Evaluation Criteria for Superfund Remedial Alternatives 1. Overall Protection of Human Health and the Environment determines whether an alternative can adequately protect human health and the environment by eliminating, reducing, or controlling exposures to hazardous substances, pollutants or contaminants to levels that do not pose an unacceptable risk. 2. Compliance with ARARs evaluates whether an alternative meets Federal and more stringent State environmental laws or facility siting laws, or whether a waiver isJiisliiieiJ 22 ------- Primary Balancing Criteria 3. Long-term Effectiveness and Permanence considers the ability of an alternative to maintain protection of human health and the environment over time. 4. Reduction of Toxicity, Mobility, or Volume of Contaminants through Treatment evaluates an alternative's use of treatment to reduce the harmful effects of principal contaminants, their ability to move in the environment, and the amount of contamination present. 5. Short-term Effectiveness considers the length of time needed to implement an alternative and the risks the alternative poses to workers, residents, and the environment during implementation. 6. Implementability considers the technical and administrative feasibility of implementing an alternative, including factors such as the relative availability of goods and services. 7. Cost includes the estimated capital and annual operation and maintenance costs, as well as present worth cost of an alternative. Present worth cost is the total cost of an alternative over time in today's dollar value. Cost estimates are expected to be accurate within a range of +50 to -30 percent. Modifying Criteria 8. State/ Support Agency Acceptance considers whether the State agrees with EPA's analyses and recommendations, as described in the Feasibility Study and Proposed Plan. 9. Community Acceptance considers whether the local community agrees with EPA's analyses and preferred alternative. Comments received on the Proposed Plan are an important indicator of community acceptance. B. Detailed Analysis of Proposed Remedial Alternatives 1. Overall Protection of Human Health and the Environment Alternative 1 (No Action) must be evaluated in accordance with CERCLA and the NCP to serve as a basis for comparison with the other alternatives. Alternative 1 would not provide any protection of human health and the environment because the identified risks in residential well drinking water currently not being treated by a POETS, soil vapor and indoor air would not be addressed. This alternative would not achieve RAOs for residential well drinking water and VI. COCs would remain at the Site at concentrations exceeding acceptable risk levels. Alternative 1 does not meet the threshold criterion of protectiveness and will not, therefore, be considered further. Alternative 2 would protect human health receptors by providing safe drinking water to affected residents, addressing VI risks, and limiting exposure to contaminated groundwater and contaminated indoor air through ICs. However, POETS can fail if not properly maintained and monitored and result in short-term exposure until maintenance is performed. Potential exposure to contaminated indoor air would be reduced to acceptable levels by VI mitigation systems. The excess risk that would result from the use of untreated contaminated residential well water would be reduced to acceptable levels by the POETS if they are properly maintained. Long-term monitoring would be conducted to assess the performance of the POETS to ensure performance standards are met. Alternative 3 would protect human health receptors by providing a permanent public water supply (with mandated monitoring requirements for the water provider) to affected residents, addressing VI risks, and limiting exposure to contaminated groundwater and contaminated indoor air through ICs. Although both 23 ------- Alternatives 2 and 3 would provide drinking water that is required to comply with drinking water standards. Alternative 3 would be more protective of human health because installation of the public water supply would permanently eliminate exposure to contaminated groundwater as a drinking water source and protect against potential emerging contaminants, such as PFAS. Exposure to potential Site-related vapor intrusion in indoor air would be eliminated by providing VI mitigation systems for those residences impacted by elevated concentrations of COCs in sub-slab vapor. ICs would be implemented to restrict the use of untreated contaminated residential well water for potable purposes and limit soil gas vapor in new construction. 2, Compliance with ARARs Section 121(d) of CERCLA, 42 U.S.C. § 9621(d), and the NCP at 40 C.F.R. § 300.430(f)(l)(ii)(B), require that remedial actions at CERCLA sites at least attain legally applicable or relevant and appropriate Federal and State requirements, standards of control, and other substantive environmental protection requirements, criteria, or limitations promulgated under Federal or State law, which are collectively referred to as "ARARs," unless such ARARs are waived under Section 121(d)(4) of CERCLA, 42 U.S.C. § 9621(d)(4), and the NCP at 40 C.F.R. § 300.430(f)(l)(ii)(C). "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, pollutant, contaminant, remedial action, location, or other circumstance at a CERCLA site. Only those State standards that are identified by a State in a timely manner and that are more stringent than Federal requirements may be applicable. "Relevant and appropriate" 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, while not "applicable" to a hazardous substance, pollutant, contaminant, remedial action, location, or other circumstance at a CERCLA site, 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 identified by a State in a timely manner and that are more stringent than Federal requirements may be relevant and appropriate. EPA also considers to-be-considered materials (TBCs), along with ARARs. TBCs are non-promulgated criteria, advisories, or guidance, issued by Federal or State government that are not legally binding and do not have the status of potential ARARs. However, TBCs may be considered during development of remedial alternatives. EPA may use TBCs in determining the necessary level of cleanup for protection of human health or the environment when ARARs do not exist for particular contaminants. ARARs for remedial action alternatives can be classified into one of the following three functional groups: • Chemical-Specific: Health-risk-based numerical values or methodologies that establish concentration or discharge limits for particular contaminants. Often, these ARARs are used to determine the extent of site remediation. In general, chemical-specific requirements are set for a single chemical or a closely related group of chemicals. Examples include MCLs, promulgated under the Safe Drinking Water Act (SDWA) and any more stringent Pennsylvania medium-specific concentrations (PA MSCs). Potential Federal and more stringent State chemical-specific ARARs are identified in Appendix C. • Location-Specific: Requirements that restrict remedial actions based on the characteristics of the Site or its immediate environment. Examples of these areas regulated under various Federal laws include 24 ------- floodplains, wetlands, and locations where historically significant cultural resources are present. Potential Federal and more stringent State location-specific ARARs identified are presented in Appendix C. • Action-Specific: Requirements that set controls or restrictions on the design, implementation, and performance levels (including discharge limits) of activities related to the management of hazardous substances, pollutants, or contaminants. These action-specific requirements do not in themselves determine the remedial alternative; rather, they indicate how a selected alternative must be achieved. An example of action-specific ARARs include the substantive requirements of the Resource Conservation and Recovery Act (RCRA) regulations for generation, characterization, and management of hazardous wastes. Potential Federal and more stringent State action-specific ARARs and TBCs are presented in Appendix C. For Alternative 2, chemical-specific ARARs for the drinking water of affected residents would be achieved via the POETS. Alternative 2 would also comply with all location-specific and action-specific ARARs specific to this limited action. For Alternative 3, there are no chemical-specific ARARs for this interim action relating to the actual treatment of public water to be supplied to Site residents via the water line because that treatment will be performed entirely off-Site by Pennsylvania American Water, a public water system provider. Nevertheless, Pennsylvania American Water is required to meet all applicable requirements, including treatment of drinking water to all applicable standards. EPA has, however, identified chemical-specific ARARs for Alternative 3 which are relevant and appropriate, along with other criteria, to determining (during design) the actual scope of the AOC—that is, which residences are impacted, or potentially impacted, by Site-related groundwater contamination, and as a result will be offered connection to the newly-constructed water line. In addition, remedial activities for Alternative 3 would be designed to comply with location-specific and action-specific ARARs identified for this interim remedial action (see Appendix C). 3. Long-Term Effectiveness and Permanence Alternative 2 would provide long-term effectiveness via POETS, VI mitigation systems, and ICs. ICs would prohibit property owners from using untreated contaminated residential well water as a potable supply and limit exposure to soil gas vapor in new construction. The provision of POETS would eliminate or reduce risks resulting from the potable use of impacted residential well water. Long-term operation and maintenance required under Alternative 2 would include periodic servicing of the treatment units (replacement of activated carbon, and UV bulbs). The spent carbon would need to be collected and returned for regeneration or appropriate disposal. Risks through exposure to contaminated indoor air would be reduced or eliminated by VI mitigation systems. LTM would effectively determine the status of residential well water and assess the performance of the POETS as well as assessing VI mitigation systems. Alternative 3 would prevent continued exposure to Site-related contaminants in drinking water supplies and protect against new or emerging contaminants, such as PFAS. Potential residential well water and VI exposures to human receptors would be reduced or eliminated by providing a public water supply and providing VI mitigation systems. The provision of a public water line would permanently eliminate unacceptable risks resulting from the use of contaminated residential well water with current or future contaminants. Additionally, the POETS provided under Alternative 2 have the potential to fail and result in short-term exposure until maintenance is performed, making Alternative 3 more effective in the long-term. Indoor air may be initially monitored annually and then less frequently as determined by EPA, in consultation with PADEP. O&M would need to continue until vapors resulting from the contaminated 25 ------- groundwater meet cleanup criteria. Risks from exposure to contaminated indoor air would be reduced to acceptable levels by the VI mitigation systems. 4. Reduction of Toxicity, Mobility, or Volume through Treatment Alternative 2 and Alternative 3 would not reduce the toxicity, mobility, and volume of contaminated groundwater at the Site since these alternatives do not treat the contaminated groundwater. Groundwater will be addressed in a future OU-2 ROD. Alternative 2 and 3 would eliminate exposure to COCs present in indoor air using VI mitigation systems. Alternative 2 would reduce exposure to Site COCs in impacted residential wells through the use of POETs and Alternative 3 would eliminate exposure to impacted residential wells with a public water line. 5. Short-Term Effectiveness Implementation of Alternative 2 would only minimally impact the local community or the environment in the short-term. No significant remediation or construction impacts would be realized other than measures taken at individual homes. Exposure of workers to COC concentrations during installations and subsequent O&M of POETS and VI mitigation systems would be minimized by wearing appropriate personal protective equipment and complying with Site-specific health and safety procedures. Implementation of Alternative 3 would pose some short-term risks to the local community, the remedial workers, or to the environment. During construction, the delivery of pipes, roadway excavation, and installation of the public water line would likely cause some hindrances to local vehicular traffic and some congestion. Establishment of proper construction traffic controls (e.g., flashing lights, signs, flags), as necessary, would minimize the chance of accidents. The greatest impact to the community, particularly nearby residents, would be noise and dust. Construction would be restricted to reasonable hours, and dust would be controlled using controls such as dust suppression by wetting. Proper construction and industrial safety practices would be implemented during installation of VI mitigation systems, the public water line, and connections of the public water supply line to individual homes. 6. Implementability Both Alternatives 2 and 3 are readily implementable, however. Alternative 3 may take longer to implement given the coordination required for construction. The POET and VI mitigation systems can be readily obtained and installed, and qualified firms are available for this work. Common industrial techniques and equipment could be used for installation and O&M of these systems. Sampling and analysis of residential well water would be readily implementable, with appropriate coordination with the homeowner. Although POETS are already in place at some residences currently impacted by contaminated groundwater, all POETS installed would require regular maintenance for a presumed period of 30 years, or until Site COC performance standards are met. The water line and lateral water service connections could be installed using standard construction techniques and equipment. However, coordination with the water company, municipa 1/township authorities, other local agencies, and affected property owners would be needed to construct the water line and connect residences. 7. Cost 26 ------- The estimated cost information for Alternatives 2 and 3, as summarized below, was developed using a presumed 30-year period and assumed that 60 homes would have POETS installed or a connection to a water line. Capital costs were estimated for construction, remedial design, work plan development, construction management, administration, and contingency. Annual O&M costs were also estimated. The present worth costs of each proposed alternative were determined as expressed in today's dollars. Total estimated costs, including capital and annual O&M costs are presented below with an accuracy of -30% to +50%. See Appendix B of the FFS for detailed Cost Estimates. Table 3: Estimated Costs of Alternatives 2 and 3 Capital Costs Annual O&M Costs Five-Year Review Present-Worth Cost Alternative 2 $884,800 range from $438,300 to $840,800 $40,000 $1 1,694,000 Alternative 3 $7,500,300 $14,000 $40,000 $7,786,000 8. State Acceptance EPA has coordinated closely with PADEP in the preparation and evaluation of this Interim ROD. PADEP concurs with the Selected Remedy for OU-1 (Appendix G). 9, Community Acceptance EPA received a variety of comments and questions concerning the proposed water line. A majority of the comments received from the local community expressed support for EPA's Preferred Alternative. Some of the comments from the local community identified a preference for the POETS. Community comments and EPA's response to such comments are included in the Responsiveness Summary section of the Interim ROD for OU-1. XI. SELECTED REMEDY The Selected Remedy for OU-1 is Alternative 3, Public Water Line, VI Mitigation Systems, ICs, and LTM, as described in detail in Section IX, Alternative 3, above. Under this interim remedial action, EPA will: • Offer to connect all properties within the AOC, i.e., those properties whose residential wells are currently contaminated with Site-related COCs, as well as those properties whose residential wells could potentially become contaminated with Site-related COCs, to a newly constructed public water line; • Offer to provide VI mitigation systems at residences where COC concentrations in indoor air are detected at levels exceeding cleanup levels for VI; • Perform LTM of the VI mitigation systems to assess the effectiveness of the systems; and • Implement ICs to prevent exposure to Site-related contaminants in groundwater by deterring the use of untreated groundwater at properties within the AOC, to restrict any impact on the Site remedy, and to prevent exposure to Site-related COCs via VI through a notification and reporting process relating to new construction in potentially affected areas. 27 ------- A. Summary of the Rationale for the Selected Remedy Alternative 3 is more protective of human health than Alternative 2 because extension of the public water supply would permanently eliminate the potential use of contaminated groundwater as a drinking water source and protect against potential emerging contaminants, such as PFAS. Additionally, Alternative 3 would provide drinking water that is required to comply with drinking water standards. The POETS provided under Alternative 2 can fail and result in short-term exposure until maintenance is performed, making Alternative 3 more effective in the long-term. Alternative 3 is also readily implementable with relatively limited short-term impacts and more cost-effective compared to Alternative 2. Based on the information available at this time, EPA has concluded that the Selected Remedy (Alternative 3: Public Water Line, VI Mitigation Systems, ICs, and LTM) meets the threshold criteria and provides the best balance of trade-offs when compared to the other alternative for OU-1 with respect to the balancing criteria. EPA expects the Selected Remedy to satisfy the following statutory requirements of CERCLA Section 121(b): 1) to be protective of human health and the environment; 2) to comply with ARARs (or justify a waiver); 3) to be cost-effective; and 4) to utilize permanent solutions and alternative treatment technologies or resource recovery technologies to the maximum extent practicable. With respect to the fifth statutory requirement, i.e., to satisfy the preference for treatment as a principal element (or justify not meeting the preference), the Selected Remedy does not satisfy the preference for treatment as a principal element. However, it does permanently eliminate or reduce the exposure pathway to contaminated groundwater via residential wells and VI into homes. The final remedial action for the Site, which will be proposed in a future Proposed Plan for OU-2 and subject to public participation requirements, will address the remaining contaminated media at the Site, including contaminated soil and groundwater. B. Summary of the Estimated Costs The cost of Alternative 3 is estimated to be $7,786,000, which is less than the estimated cost of $1 1,694,000 for Alternative 2. C. Performance Standards For the Selected Remedy under this Interim ROD for OU-1, the performance standards for addressing COCs in residential well water are identified in Appendix D. As discussed above, these performance standards do not apply to the off-Site treatment, under applicable law, of public water to be supplied by PA American Water to Site residents via the newly installed water line. These performance standards are, however, contaminant concentration levels that will be used during remedial design, among other criteria, to delineate the AOC. Homes in the AOC will be offered a water line connection (currently depicted in Figure 3). The AOC is defined as the area overlying the Site groundwater plumes and investigation areas as well as a buffer area around the plumes. The buffer area will also be determined more precisely during the design of the water line. All homes within the AOC will be offered a connection to the water line. For this interim remedial action, performance standards for COCs in contaminated residential well water, measured in micrograms per liter (ug/L), were established to delineate the AOC for placement of the water line to protect human health. These performance standards were primarily based on Federal MCLs or more stringent P A MSCs. If MCLs or MSCs were not available, then performance standards were developed based on EPA RSLs, which are risk-based (tapwater RSLs based on ILCR of 1E-5 or HQ of 0.5) unless background levels or the analytical detection limits were higher. It should be noted that EPA RSLs are non- 28 ------- mandatory standards which can, nevertheless, be used as the drinking water standards for the affected residences at the Site, as necessary to ensure protection of public health. Cleanup levels for the VI pathway were based on EPA RSLs and Vapor Intrusion Screening Levels (VISLs), and PADEP soil gas and indoor air screening values. It should be noted that EPA RSLs and VISLs and PADEP soil gas and indoor air screening values are non-mandatory standards. Cleanup levels selected for VI are identified in Appendix E. D. Expected Outcome of the Selected Remedy The Selected Remedy is expected to meet all RAOs for this Interim ROD. The RAO established for drinking water: • Prevents potential human exposure to Site-related contaminants in groundwater through ingestion above levels that pose an unacceptable risk for residential use. RAOs established for soil vapor and indoor air: • Protects current and future residents from adverse health effects that may result from exposure to VOC-contaminated vapors attributable to the Site-related groundwater plumes. • Mitigates potential contaminant migration from subsurface VI into residential indoor air. XII. STATUTORY DETERMINATIONS The OU-1 Selected Remedy is protective of human health and the environment, complies with Federal and State requirements that are legally applicable or relevant and appropriate to the remedial action, is cost-effective, and utilizes permanent solutions to the maximum extent practicable. Because the Selected Remedy will result in hazardous substances remaining on site above levels that allow for unlimited use and unrestricted exposure, a review will be conducted within five years after commencement of the Selected Remedy to ensure that the remedy continues to provide adequate protection of human health and the environment. Such reviews will be conducted a minimum of every five years thereafter, until EPA determines that hazardous substances remaining at the Site do not prevent unlimited use and unrestricted exposure at the Site. A. Compliance with Applicable or Relevant and Appropriate Requirements An interim action must comply with (or waive) those Federal and State requirements that are applicable or relevant and appropriate to the limited-scope action. Therefore, the focus is only on those ARARs specific to this interim action (e.g., chemical-specific ARARs associated with POETS or hazardous waste management regulations during remedy implementation). While the final remedial action for OU-2 will address the remaining Site-related contamination in soil and groundwater, this interim remedial action for OU-1 will implement limited action to prevent human exposure to contaminated groundwater in residential wells and mitigate VI infiltration emanating from the groundwater. The final remedial action for OU-2, after any necessary public participation requirements are met, will address the remaining unacceptable risks presented by the Site. A complete list of ARARs and TBCs for the Selected Remedy for OU-1 is provided in Appendix C. The major ARARs identified therein include, but are not limited to: 29 ------- • Maximum Contaminant Levels (MCLs), 40 C.F.R. §§ 141.61 and 141.62, which establish health- based standards for certain organics and inorganics for public drinking water, to be used as standards to delineate the AOC for placement of the water line. • PA Statewide Health Standards, Medium-Specific Concentrations (MSCs), 25 PA Code §250.304, to be used as standards to delineate the AOC for placement of the water line where there are no MCLs. • The substantive standards under PA Safe Drinking Water Regulations, 25 PA Code Chapter 109, Subchapter F, that are relevant to design and construction of a water line and/or laterals. • Substantive PA Standards applicable to generators of hazardous waste, as defined by 25 PA Code § 261 a.3(b), during remedial action. • Substantive PA requirements for erosion and sediment control, to be applied during the construction of the water line. B. Cost Effectiveness The NCP at 40 C.F.R. § 300.430(f)(l)(ii)(D), requires EPA to evaluate cost-effectiveness by comparing all the alternatives meeting the threshold criteria: protection of human health and the environment; and compliance with ARARs against long-term effectiveness and permanence. The Selected Remedy is cost-effective in providing overall protection of human health and the environment by limiting the risk posed by Site COCs and meets all other requirements of CERCLA and the NCP at a cost that is proportional to the other alternatives that were evaluated. Further, the Selected Remedy is readily implementable and provides a high degree of both short- and long-term effectiveness. The estimated present value of the selected remedial action is approximately $7,786,000. C. Utilization of Permanent Solutions and Alternative Treatment Technologies to the Maximum Extent Practicable and Preference for Treatnient as a Principal Element The Selected Remedy is an interim remedial action and is not intended to treat contamination or provide a permanent solution to contamination in groundwater. A future decision document will address remaining contamination present in soils and groundwater at the Site, for both OU-1 and OU-2 D. Five Year Review Requirements Section 121(c) of CERCLA and Section 300.430(f)(4)(ii) of the NCP require review of a remedy if the remedy results in hazardous substances, pollutants, or contaminants remaining on-site above levels that allow for unlimited use and unrestricted exposure. Any such review must be conducted no less often than every five years after initiation of the remedial action. Because hazardous substances will remain at the Site, the review described by Section 121(c) of CERCLA and Section 300.430(f)(4)(ii) of the NCP will be conducted no less often than every five years after initiation of the remedial action. E. Documentation of Significant Changes The Proposed Plan was released for public comment on September 28, 2022. EPA has reviewed all comments submitted during the public comment period and determined that no significant changes were 30 ------- necessary or appropriate to the remedy, as originally identified in the Proposed Plan. XIII. RESPONSIVENESS SUMMARY The 30-day public comment period opened on September 28, 2022 and closed on October 28, 2022. During this time, EPA received a variety of comments and questions, including those raised at the public meeting. Responses to significant comments received during the public comment period can be found in the Responsiveness Summary included in this Interim Record of Decision as Appendix B. 31 ------- APPENDIX A ADMINISTRATIVE RECORD INDEX 32 ------- UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 111 1600 John F. Kennedy Blvd. Philadelphia, Pennsylvania 19103 OLD WILMINGTON ROAD GW CONTAMINATION REMEDIAL ADMINISTRATIVE RECORD FILE INDEX OF DOCUMENTS AVAILABLE 9/28/2022, UPDATED //2023 https://semspub.epa.gov/src/collection/03/AR67242 ------- Introduction The "Administrative Record" is the collection of documents which form the basis for the U. S. Environmental Protection Agency's (EPA) selection of a response action at a Superfund site. Superfund is the name given to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) which can be found in Title 42 of the U.S. Code (U.S.C.) at Sections 9601 through 9675. Response actions under Superfund can be either "removal actions" or "remedial actions." As the EPA decides what to do at the site of a release of hazardous substances, the EPA compiles documents concerning the site and EPA's decision into an "Administrative Record File." Documents may be added to the Administrative Record File from time to time. Once the EPA Regional Administrator or the Regional Administrator's delegate signs the decision document memorializing the selection of an action, the documents which form the basis for the selection of an action are known as the "Administrative Record." An Administrative Record file is required by CERCLA, as amended by the Superfund Amendments and Reauthorization Act (SARA). The Administrative Record will be available for public review during normal business hours in an electronic computer imaged format at the selected repository and by appointment only at the Environmental Protection Agency (EPA), Region 3 office which is located at the address given on the cover page. The Administrative Record is treated as a non-circulating reference document. Individuals may review documents contained in the Administrative Record, according to the procedures at the local repository and at the EPA Region 3 office. The Administrative Record will be maintained at the repository until further notice. EPA may send additional documents to the repository as work progresses at the Site. The EPA may hold formal public comment periods at certain stages of the response process. The public is urged to use the formal public comment periods to submit written comments to the EPA regarding the actions at the Site. Except as explained below, this index and the record were compiled in accordance with the EPA's Revised Guidance on Compiling Administrative Records for CERCLA Response Actions, EPA/OSRE/OEM/OSRTI (September 20, 2010), and/or in accordance with Superfund Removal Procedures Public Participation Guidance for On-Scene Coordinators: Community Relations and the Administrative Record, OSWER 9360.3-05 (July 1992), and/or the National Oil and Hazardous Substances Pollution Contingency Plan (NCP), 40 CFR Part 300. Consistent with 40 CFR Sections 300.805 (a) (2), and 300.810 (a) (2), Region 3 has listed, in the Administrative Record Index (or in bibliographies of documents listed in the Index), guidance documents which may form a basis for the selection of this response action (EPA Guidance Documents, Non-Site Specific). Unless the guidance documents indexed were generated specifically for the Site, the guidance documents may not be present in the Administrative Record. However, it should be noted that the EPA does maintain an extensive collection of Superfund response action guidance documents available in electronic format on the EPA website at: https://www.epa.eov/superfund/superfund-policv-guidance-and-laws. 2 ------- Additionally, the EPA guidance related to Superfund cleanup enforcement may be found on the website at the following address: http://cfpub.epa.gov/compliance/resources/policies/cleanup/superfund. This page is titled, "Superfund Cleanup Policies and Guidance." The Administrative Record is listed in chronological order with the earliest dated document at the top and followed by documents which may be "Undated." Throughout the Administrative Record File, EPA has redacted certain documents to protect against the disclosure of potential confidential business information and/or information which may involve personal identifiable information or a protected interest, The redactions are evident from the face of the particular document and the word "Redacted" appears in the title on the index. Documents listed as bibliographic sources for other documents in the record might not be listed separately in the Site Index. The documents in the Old Wilmington Road GW Contamination Removal Administrative Record File dated 9/3/2019 are herein incorporated by reference, and the index of documents is attached. 3 ------- OLD WILIMINGTON ROAD OU 1 REMEDIAL ADMINISTRATIVE RECORD FILE GW CONTAMINATION INDEX OF DOCUMENTS In CHRONOLOGICAL Order Updated //2023 DOC ID DOC DATE TITLE PAGE COUNT ADDRESSEE NAME AUTHOR NAME 2335756 09/26/1996 PARTIAL CONSENT DECREE - CIVIL ACTION NO. 95-5578 - PERRY PHILLIPS MOBILE HOME PARK 22 BUCKWALTER,WAYNE (WERNER WOOD & BUCKWALTER) | HERMAN,STEVEN,A (EPA) | MCCABE,W MICHAEL (EPA) | MENTZINGER,RICHARD (US ATTORNEY OFFICE) | PHILLIPS,JEANNE (PERRY PHILLIPS MOBILE HOME PARK) | PHILLIPS,PERRY (PERRY PHILLIPS MOBILE HOME PARK) |SCHIFFER,LOIS,J (US DEPT OF JUSTICE) 2335755 12/13/2000 REDACTED PUBLIC HEALTH ASSESSMENT 46 (ATSDR) | (PA DEPT OF HEALTH) 2335752 07/16/2015 REDACTED SAMPLING & ANALYSIS PLAN (SAP) FOR SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) ACTIVITIES 113 (EPA) (TETRATECH) 2335757 03/18/2022 PA STATE HISTORIC PRESERVATION OFFICE ENVIRONMENTAL REVIEW SUMMARY LETTER 2 OKORN,BARBARA (EPA) DIEHL,EMMA (PA STATE HISTORIC PRESERVATION OFFICE) 2335759 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - MAIN REPORT, TABLES & FIGURES 173 (EPA) (TETRA TECH) 2335761 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX A - BORING LOGS & WELL CONSTRUCTION LOGS - 2016 INVESTIGATION 70 (EPA) (TETRATECH) 2335763 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX B - GEOPHYSICAL LOGS - 2016 INVESTIGATION 81 (EPA) (TETRATECH) 2335765 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX C - PACKER TEST ANALYTICAL RESULTS 118 (EPA) (TETRA TECH) 2335766 05/01/2022 SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT- APPENDIX D - GROUNDWATER SAMPLING LOGS 59 (EPA) (TETRATECH) 2335768 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX E - HUMAN HEALTH RISK ASSESSMENT (HHRA) 812 (EPA) (TETRATECH) 2335770 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX F - REMEDIAL INVESTIGATION - 2010 7052 (EPA) (TETRATECH) 2335772 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX G - RAW ANALYTICAL DATA 872 (EPA) (TETRATECH) 4 ------- OLD WILIMINGTON ROAD OU 1 REMEDIAL ADMINISTRATIVE RECORD FILE GW CONTAMINATION INDEX OF DOCUMENTS In CHRONOLOGICAL Order Updated //2023 DOC ID DOC DATE TITLE PAGE COUNT ADDRESSEE NAME AUTHOR NAME 2335774 05/01/2022 REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT - APPENDIX H - VAPOR INTRUSION SAMPLING RESULTS - 2019 156 (EPA) (TETRATECH) 2335750 06/01/2022 REDACTED FOCUSED FEASIBILITY STUDY (FFS) 117 (EPA) (TETRATECH) 2336313 09/28/2022 OU 1 PROPOSED REMEDIAL ACTION PLAN (PRAP) 35 (EPA) 2342539 09/28/2022 PUBLIC NOTICE: PROPOSED CLEANUP PLAN AVAILABLE FOR PUBLIC COMMENT 1 (EPA) 2336319 10/01/2022 COMMUNITY UPDATE: EPA PROPOSES INTERIM CLEANUP IN A PROPOSED PLAN 4 (EPA) 2342527 10/11/2022 OU 1 PROPOSED REMEDIAL ACTION PLAN (PRAP) PUBLIC MEETING TRANSCRIPT 118 (LEXITAS LEGAL) 2342529 10/16/2022 REDACTED PUBLIC COMMENT ON OU 1 PROPOSED REMEDIAL ACTION PLAN (PRAP) 1 SHANDRUK,IRENE (EPA) (RESIDENT) 2342531 10/21/2022 REDACTED PUBLIC COMMENT ON OU 1 PROPOSED REMEDIAL ACTION PLAN (PRAP) 1 SHANDRUK,IRENE (EPA) (RESIDENT) 2342526 04/05/2023 PADEP LETTER OF CONCURRENCE WITH OU 1 INTERIM RECORD OF DECISION (ROD) 2 LEONARD,PAUL (EPA) PATTERSON,PATRICK (PA DEPT OF ENVIRONMENTAL PROTECTION (PADEP)) 5 ------- OLD WILMINGTON ROAD GW CONTAMINATION REMOVAL ADMINISTRATIVE RECORD FILE * A INDEX OF DOCUMENTS I. FACTUAL INFORMATION/DATA 1. Sample results taken from the Perry Phillips Mobile Home Park, 8/88 through 11/92. P. 100001-100002. 2. Pennsylvania Department of Environmental Resources (PADER) Safe Drinking Water Act, Inorganic/Organic Chemical and Radiological Analysis, Perry Phillips Landfill, Contamination Identification numbers 2969, 2976, 2977, 2980, 2981, 2982, 2984, and 2990, 6/5/91 through 11/13/92. P. 100003-100015. Four Special Analysis Reports are attached. 3. Result Summary package of Volatile Organic Analysis Data, sample numbers A1431 through A1439, 4/16/92. P. 100016-100025. 4. Report: EPA Region III Central Regional Laboratory, Perry Phillips Mobile Home Park, SDWA AUH03N0AF, REQ9300 013, prepared by U.S. EPA, 12/30/92. P. 100026-100040. 5. Letter to Mr. Perry Phillips from Mr. Bill Foster, U.S. EPA, re: Results of samples taken from the Phillips Household and the Perry Phillips Mobile Home Park, 1/20/93. P. 100041-100042. 6. Emergency Response Notification System (ERNS) Incident Notification Report, Perry Phillips Landfill, 1/21/93. P. 100043-100043. 7. Memorandum to Mr. Gregg Crystall, U.S. EPA, from Mr. Bill Foster, U.S. EPA, re: Site background information, 1/21/93. P. 100044-100044. Administrative Record File available 4/1/94, updated 4/13/99 and 9/3/19. A This site was formerly referred to as Perry Phillips Landfill. ------- 8. U.S. EPA Pollution Report #1, Perry Phillip Landfill, 3/2/93. P. 100045-100045. 9. Analytical Report Number 1303013, prepared by Roy F. Weston, Inc., 3/18/93. P. 100046-100059. 10. Memorandum to Mr. Mike Towle, U.S. EPA, from Ms. Marian Murphy, Roy F. Weston, Inc. , re: Transmittal of a report reviewing the data package for 11 water samples and 1 field blank collected on March 2, 1992, 3/23/93. P. 100060-100090. The review report is attached. 11. Memorandum to Mr. Mike Towle, U.S. EPA, from Mr. Christopher P. Guy, Roy F. Weston, Inc., re: Summary of a Technical Assistance Team (TAT) site inspection visit to collect water samples, 7/8/93. P. 100091- 100093. A site map is attached. 12. U.S. EPA Pollution Report #2, Perry Phillip Landfill, 9/9/93. P. 100094-100094. 13. Princeton Testing Laboratory Inc., samp1e analysis summary for volatile organics, priority pollutants, and EPA 624, 12/15/93. P. 100095-100105. 14. U.S. EPA Pollution Report #3, Perry Phillip Landfill, 12/20/93. P. 100106-100106. 15. Summary of Section 1431 of the Safe Drinking Water Act proposed to be enforced for the site, (undated). P. 100107-100107. 16. Figure 5.3, Home Well Samp1e Locations, Perry Phillips Landfill, prepared by NUS Corporation, (undated) . P. 100108-100112. The following are attached: a. Figure 2.2, Site Sketch; b. Figure 2.3, Site Sketch; c. a Samp1e Log; d. a Samp1e Data Summary. 17. Organic Data Validation Report for Case * * Number 47227, Samp1e Delivery Group Number C07P6, 12/22/17. P. 100113-100163. A December 26, 2018 transmittal memorandum and November 2017 Samp1e Summary Report are attached. ------- 18. Organic Data Validation Report for Case Number 47227, Sample Delivery Group Number C07L7, 1/2/18. P. 100164-100225. A February 8, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 19. Organic Data Validation Report for Case Number 47227, Sample Delivery Group Number C07L8, 1/19/18. P. 100226-100283. A January 26, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 20. Organic Data Validation Report for Case Number 47227, Sample Delivery Group Number C07Q8, 1/26/18. P. 100284-100344. A February 8, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 21. Organic Data Validation Report for Case Number 47227, Sample Delivery Group Number MC07L7, 1/29/18. P. 100345-100383. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 22. Organic Data Validation Report for Case Number 47227, Sample Delivery Group Number MC07R4, 1/29/18. P. 100384-100419. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 23. Organic Data Validation Report for Case Number 47227, Sample Delivery Group Number MC07S8, 1/29/18. P. 100420-100463. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. Document has been redacted due to confidential business information and/or to protect the privacy of individuals. Redactions are evident from the face of the document. 3 ------- 24. Organic Data Validation Report for Case * * Number 47227, Sample Delivery Group Number MC07L8, 1/30/18. P. 100464-100506. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 25. Organic Data Validation Report for Case * * Number 47227, Sample Delivery Group Number MC07P1, 1/30/18. P. 100507-100531. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 26. Organic Data Validation Report for Case * * Number 47227, Sample Delivery Group Number MC07P3, 1/30/18. P. 100532-100574. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 27. Organic Data Validation Report for Case * * Number 47227, Sample Delivery Group Number MC0B18, 1/31/18. P. 100575-100592. A February 14, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 28. Organic Data Validation Report for Case * * Number 47227, Sample Delivery Group Number C07W0, 2/1/18. P. 100593-100636. A February 13, 2018 transmittal memorandum and November 2017 Sample Summary Report are attached. 29. Electronic Memorandum to Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Sampling results for lead on residential property, 4/16/18. P. 100637-100637. 30. Electronic Memorandum to Ms. Dawn Ioven, U.S. EPA, and Mr. Eduardo Rovira, U.S. EPA, from Mr. Martin Gehlhaus, U.S. EPA, re: Type of Removal Action, 4/17/18. P. 100638-100640. 31. Electronic Memorandum to Mr. Martin Gehlhaus, U.S. EPA and Mr. Eduardo Rovira, U.S. EPA, from Ms. Dawn Ioven, U.S. EPA, re: Levels of manganese in residential sampling, 4/17/18. P. 100641-100643. 4 ------- 32. Electronic Memorandum to Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Questions about Action Memorandum, 4/20/18. P. 100644-100647. 33. Electronic Memorandum to Ms. Mary Rugala, U.S. EPA, and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Transmittal of site-related removal documents, 4/23/18. P. 100648-100674. Pollution Reports 1-12, a January 21, 1993 Incident Notification Report, and the December 21, 1993 Special Bulletin A are attached. 34. Electronic Memorandum to Ms. Mary Rugala, U.S. EPA, and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Transmittal of Action Memorandums, 4/23/18. P. 100675-100685. The May 4, 1994 Action Memorandum is attached. 35. Electronic Memorandum to Ms. Mary Rugala, U.S. EPA, * * and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Residential well water sampling, 4/23/18. P. 100686-100691. Letters to two residents are attached. 36. Electronic Memorandum to Ms. Mary Rugala, U.S. EPA, * * and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Transmittal of site parcel map, 4/24/18. P. 100692-100693. Site parcel map attached. 37. Electronic Memorandum to Mr. Rombel Arquines, U.S. EPA, from Mr. Eduardo Rovira, U.S. EPA, re: Site description, 4/24/18. P. 100694-100694. 38. Electronic Memorandum to Mr. Rombel Arquines, U.S. EPA, and Mr. Alexander Mandell, U.S. EPA, from Mr. Eduardo Rovira, U.S. EPA, re: Bottled water delivery to residents, 4/24/18. P. 100695-100695. 5 ------- 39. Organic Data Validation Report for Case * * Number 47596, Sample Delivery Group Number MC07X1, 7/2/18. P. 100696-100740. A July 9, 2018 transmittal memorandum and May 2 018 Sample Summary Report are attached. 40. Organic Data Validation Report for Case * * Number 47596, Sample Delivery Group Number C0807, 7/10/18. P. 100741-100821. A July 17, 2018 transmittal memorandum and May 2018 Sample Summary Report are attached. 41. Organic Data Validation Report for Case * * Number 47596, Sample Delivery Group Number MC0801, 7/10/18. P. 100822-100875. A July 17, 2018 transmittal memorandum and May 2018 Sample Summary Report are attached. 42. Organic Data Validation Report for Case * * Number 47596, Sample Delivery Group Number MC0839, 7/11/18. P. 100876-100909. A July 17, 2018 transmittal memorandum and May 2018 Sample Summary Report are attached. 43. Electronic Memorandum to Mr. Eduardo Rovira, * * U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Results of residential well sampling, 9/14/18. P. 100910-100915. Four maps of sampling locations with handwritten notes are attached. 44. Electronic Memorandum to Mr. Eduardo Rovira, * * U.S. EPA, and Mr. Rombel Arquines, U.S. EPA, from Mr. Martin Gehlhaus, U.S. EPA, re: Concentration of manganese in residential water, 9/26/18. P. 100916- 100920 . 45. Electronic Memorandum to Mr. Eduardo Rovira, * * U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Water softening manganese treatment system , 10/9/18. P. 100921-100927. A September 26, 2018 proposal, a system specification sheet, and an October 8, 2018 email to Mr. Rombel Arquines, U. S. EPA, are attached. 6 ------- 46. Electronic Memorandum to Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Location of data on share drive, 11/6/18. P. 100928-100928. 47. Electronic Memorandum to Mr. Eduardo Rovira, * * U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re: Transmittal of Draft Action Memorandum, 11/29/18. P. 100929-100930. 7 ------- II . DECISION DOCUMENTS 1. Special Bulletin A memorandum to the Regional Response Center, U.S. EPA, from Mr. Michael Towle, U.S. EPA, re: Notification of $50,000 activation, 12/21/93. P. 200001-200004. 2. Memorandum to Mr. Elliot Laws, U.S. EPA, from Mr. Stanley Laskowski, U.S. EPA, re: Approval of Additional Funding and Exemption from the 12-Month Statutory Limit, 2/4/94. P. 200005-100019. A memorandum regarding a Request for Additional Funding and Exemption from the 12-Month Statutory Limit and a Special Bulletin A memorandum dated December 21, 1993 regarding the $50,000 activation are attached. 3. Memorandum to Mr. Timothy Fields, U.S. EPA, from Mr. Abraham Ferdas, U.S. EPA, re: Approval of a request for additional funding for continued removal actions at the site, 11/24/98. P. 200020-200029. A November 24, 1998, memorandum to Mr. Abraham Ferdas, U.S. EPA, from Mr. Kevin Boyd, U.S. EPA, requesting additional funding for a removal action; and a September 17, 1998, memorandum to Mr. Timothy Fields, U.S. EPA, from Mr. Abraham Ferdas, U.S. EPA, approving a request for an exemption to the 12-month statutory limit for a removal action restart and the use of remaining original funds, are attached. 4. Special Bulletin for a Removal Action, Old Wilmington Road Groundwater Superfund Site, 4/24/18. P. 200030- 200039. 5. Memorandum to Mr. Paul Leonard, U.S. EPA, from Mr. Eduardo Rovira, U.S. EPA, re: Request for Additional Funds, Change of Scope, and Exemption From 12-Month Statutory Limit for Removal Action, 1/30/19. P. 200040-200047. 6. Modification of Administrative Record, 8/28/19. P. 200048-200064. A January 30, 2019 Memorandum to Mr. Paul Leonard, U.S. EPA, from Mr. Eduardo Rovira, U.S. EPA, and an Index of Documents for the 2019 update to the Administrative Record, are attached. 8 ------- APPENDIX B RESPONSIVENESS SUMMARY 33 ------- This Responsiveness Summary for the Interim ROD summarizes information about the views of the public regarding both the remedial alternatives and general concerns about the Old Wilmington Road Groundwater Superfund Site, OU-1 Proposed Plan, submitted during the public comment period. EPA issued a public notice in the Daily Local News on September 28,2022, which contained a list of the components of EPA's preferred alternative, information relevant to the duration of the public comment period, the date of the public meeting, and the availability of the Proposed Plan and the AR file. The public comment period for the Proposed Plan was from September 28, 2022 through October 28, 2022. During the public comment period, EPA received written and oral comments. Additionally, a public meeting was held on October 1 1, 2022, at the Wagontown Fire Company, during which time the public could provide oral comments and ask questions in-person. After receiving the public's questions and comments both during the public comment period and public meeting for the Site, EPA determined that no significant changes to the proposed interim remedial action, as originally identified in the Proposed Plan, were necessary or appropriate. Comments Received during Public Comment Period EPA received comments from a total of 3 residents of the local community, i.e., one comment via email from one resident, one comment via voicemail, and a comment letter via postal mail. Additionally, numerous comments and questions were provided orally during the public meeting on October 1 1, 2022, which are summarized below and also documented in a meeting transcript that can be found in the AR file for this Site, which is available to the public online at https://semspub.epa.gov/src/collection/03/AR67242. Below are summaries of the significant comments and questions that EPA received and EPA's responses to them. Comment #1 Comment: EPA received several comments in support of Alternative 3. Response: EP A thanks the commenters for their support of the Selected Remedy. Comment #2 Comment: One resident wrote: "Our household is outside of the plume area. Are we able to have a water connection to our house? If yes, who is going to pay for it?" A similar question was posed during the public meeting. Response: As presented in the Proposed Plan, EP A has delineated the extent of the VOC and 1,4-dioxane plumes and identified an "area of concern" (AOC) which includes the area above the plumes and sources areas as well as a buffer area around the plumes. The extent of the buffer area will be determined during the remedial design. If a property is located within the AOC, EPA will offer the property owner a connection to the water line and EPA will pay for the connection. If a property is outside of the AOC, EPA will not be offering to connect the property to the water line. If conditions change or new data demonstrate that additional properties are impacted or potentially impacted by either current Site COCs or additional contaminants that may be determined to be Site COCs, those properties will be included in 34 ------- the AOC. Also, even if a property is not located within the AOC, the resident could still connect to the water line at their own expense. Comment #3 Comment: A resident wrote: "At the meeting it was mentioned that PFAS chemicals was also in the groundwater. Why was it not listed on the map showing the extent of the PF AS plume area? Are PFAS (forever chemicals) plume spreading?" A similar question was posed during the public meeting. Response: The map did not show the extent of the PF AS contamination because EPA does not yet know the extent of the PF AS contamination in the groundwater. That investigation is still on-going as EPA continues to gather more information. Once additional information is gathered, it will be used to delineate the extent of PFAS contamination and whether it is spreading. Comment #4 Comment: A resident wrote: "It has been many years since EPA tested our well water for toxic chemicals. Is EPA going to test our water in the future?" Response: With respect to the volatile organic compound (VOC) and 1,4-dioxane plumes, hydrogeological studies and years of groundwater monitoring data demonstrate that they are stable. EPA continues to conduct groundwater monitoring at the Site. EPA anticipates that the monitoring will continue to demonstrate that the plumes are stable. However, if future monitoring shows that the plumes are migrating, EPA will conduct additional groundwater sampling as necessary. With respect to PFAS, EPA will be sampling residential well water in the future as the investigation into PFAS for OU-1 continues and as the remedial investigation for OU-2 continues. Comment #5 Comment: A resident asked: "Is EPA considering a cancer impact study for this Superfund site area? If not, then why not?" At the public meeting, another resident inquired whether cancer rates for this area were higher than for other areas. Response EPA does not conduct cancer impact studies. Cancer studies are conducted by the appropriate health agency. In this case the appropriate health agency is the Pennsylvania Department of Public Health (PADOH). PADOH's Pennsylvania Cancer Registry is a statewide data system responsible for collecting information on all new cases of cancer diagnosed or treated in Pennsylvania. The web address is: https://www.health.pa.gov/topics/disease/Cancer/Pages/Cancer.aspx. PADOH's Registry is part of the National Program of Cancer Registries administered by the Centers for Disease Control and Prevention (CDC). On a county level, out of 67 counties in Pennsylvania, 51 counties have higher cancer incidence rates than Chester County, meaning that Chester County has one of the lower rates of cancer in Pennsylvania. More information can be found 35 ------- at: https: //statecancerprofiles. cancer, gov/incidencerates/index. php?stateFIPS=42&areatvpe=c ount¥&cancer=001 &race=00&sex=0&age=001 &stage=999&vear=0&tvpe=incd&sortV ariab lcNamc ratc&sortOrder dcsc&outpiit 2 Coninient #6 Comment: One commenter stated: "We are concerned because in the future the plumes will affect our well water. Is the plume stable in size or is it spreading? Response: As stated in response to Comment #4 above, data demonstrate that the VOC and 1,4-dioxane plumes are stable. EPA does not have any evidence suggesting that they are spreading. Comment #7 Comment: One resident wrote: "Also there was no Amish members of the area present at the meeting. Were they notified? A similar question was asked during the public meeting. Response: Yes, the Amish community members were notified. Fact sheets were mailed out to a large area surrounding the Site, including the Amish community. Comment #8 Comment: One resident commented in support of Alternative 2. The resident stated the following reasons: "Our current economic crisis has caused families who are struggling to afford the basic necessities such as food, gas for their car, or heat for their homes to add an additional monetary burden. If families can't afford all of these basic needs, it would cause them to choose which one not to pay. Because of this we oppose alternative 3. The second reason we oppose alternative 3 - "is public water really safe?" Considering they put chemicals in this water (ie: Chlorine, Fluoride, etc. these chemicals cause harm to our bodies even at recommended EPA levels) but we the people who are receiving this public water don't know what other contaminates [sic] are in the water but would just have to trust the water company that they are testing the water." Response: EPA acknowledges that there would be a monthly water bill for each resident who connects to the public water line as part of Alternative 3. However, while there is no obligation to connect, it would provide a permanent public water supply (with mandated monitoring requirements) eliminating unacceptable risks resulting from the use of contaminated residential well water and protect against new or emerging contaminants, such as per- and polyfluoroalkyl substances (PFAS). In addition, please see EPA's response to Comment #10. With regards to the commenter"s second reason, state and federal regulations require routine monitoring of public water supplies and establish safe drinking water standards which must be met by the provider. These standards are designed to protect human health and are enforceable. Additionally, public water suppliers are required to provide customers with Consumer Confidence Reports on an annual basis. These reports provide customers with information about their local water quality. Finally, although there are some costs associated with connection to a public water line, there are also costs associated with well water including electric, pump repair and routine maintenance. 36 ------- Comment #9 Comment; There were questions during the public meeting concerning the current status of the Site's cleanup. Response: As stated in the ROD, EPA continues to investigate and clean up contaminated media, including soil and groundwater, as part of Operable Unit 2 (OU-2), at the Site. The Selected Remedy in this Interim ROD provides a permanent public water supply via a water line that will prevent exposure to Site-related groundwater contamination in residential drinking water wells as well as VI while EPA addresses OU-2. Once EPA collects sufficient data and evaluates the data, EPA will identify the clean-up alternatives for OU-2 and will proceed through the community involvement process to present EPA's preferred alternative for remediation of Site soils and groundwater to the public. While the investigation for OU-2 continues, EPA's priority has been to ensure that the community's drinking water is safe by first providing POETS to affected residents through removal actions and now by selecting a permanent public water supply via a water line under Operable Unit 1 (OU-1). Comment #10 Comment: During the public meeting, a resident asked why the homeowner has to pay the water bill if they are connected to the water line. Response: EP A is authorized to remediate threats arising from the release of hazardous substances. EPA will eliminate this threat and prevent human exposure to hazardous substances by installing a water line. This water line will serve as a clean and safe drinking water source to homeowners. EPA does not have authority to provide funding for the actual supply of water to individual homeowners and these costs are typically the responsibility of the homeowner. Comment #11 Comment: During the public meeting, there was a question as to whether EPA has considered air sparging as an alternative remedy? Response: Air sparging could potentially be considered under OU-2. The Proposed Plan for OU-1 presented alternatives to prevent exposure to Site-related groundwater contamination in residential drinking water wells as well as VI. Air sparging is a remediation technology used to treat contaminated groundwater, the treatment of which will be addressed as part of OU-2. Comment #12 Comment: During the public meeting, there were questions concerning groundwater flow and frequency of monitoring well sampling. Response: There are several underground bedrock fractures and faults that influence groundwater flow, which is generally eastward. Based on hydrogeological studies. 37 ------- monitoring wells have been carefully placed so as to define the extent of contamination. EPA has sampled monitoring wells at the OVV'R Site for years now and has collected enough data to define where the VOC and 1,4-dioxane groundwater contamination is located. Given that the plumes of VOC and 1,4-dioxane contamination are well defined, monitoring wells are sampled less frequently than they historically have been sampled. The extent of the VOC and 1,4-dioxane plumes is stable, and EPA does not have any evidence to suggest that the VOC and 1,4-dioxane plumes are expanding. EPA, however, may conduct additional sampling for VOCs and 1,4-dioxane as part of OU-2. EPA does not expect any such sampling to show that the plumes have expanded, however, if new data demonstrate that Site COCs have migrated, EPA will take appropriate action. EPA will conduct additional sampling for PF AS for OU-1. Comment #13 Comment: During the public meeting, there were questions concerning how monitoring is conducted for vapor intrusion. Response: Vapor intrusion occurs when there is a migration of vapor-forming chemicals from any subsurface source into an overlying building. The vapor-forming chemicals of concern at this Site are VOCs. These vapors are monitored for by taking vapor samples from the soil under the home's foundation; these are called slab, or sub-slab samples. EPA does not generally recommend indoor air sampling before slab or sub-slab sampling, because indoor air quality varies widely day to day. Also, household products may interfere with sampling results. Indoor air samples are generally collected from the lowest-level space in a building, typically a basement, during the heating season. If a building does not have a basement, indoor air samples may be collected from the first floor. Sub-slab vapor and outdoor air samples are usually collected at the same time as indoor air samples to help determine where VOCs may be coming from (indoor sources, outdoor sources, and/or beneath the building). For more information on vapor intrusion, see https://www.epa.gov/vaporintrusion. Comment #14 Comment: During the public meeting, a resident inquired about whether there were maps of the vapor intrusion monitoring. Response: EPA conducted a vapor intrusion investigation at this Site and does indeed have maps with residential results. The individual residences that were sampled for VI were provided with the results. Addresses of those sampled are not made available to the general public due to privacy concerns for the individual property owners and, consequently, residential monitoring results are not made available to the general public either. As part of the Selected Remedy, additional vapor intrusion sampling may be conducted in the future. Comment #15 Comment: During the public meeting, a resident inquired if a permit would be issued to allow for a new residential well to be drilled in the area for a new house. 38 ------- Response: Chester County is responsible for issuing permits for residential wells. Chapter 500, Section 501, of the Chester County Health Department Rules and Regulations outlines the requirements and restrictions for issuing such permits. Additionally, as part of the Selected Remedy, ICs will be implemented to restrict potable use of untreated groundwater within the contaminated plumes along with a prohibition on the installation of any new groundwater wells within the lateral extent of the plumes until remediation standards and protectiveness have been achieved, unless EPA, in consultation with PADEP, gives prior written approval for such installation. Comment #16 Comment: During the public meeting, a question was raised as to why we don't go after the responsible parties. Response: EPA does investigate potentially responsible parties and that process is still on- going for this Site. Comment #17 Comment: Have you informed the community about two other Superfund Sites that are nearby? Response: William Dick Lagoons (see www.epa.gov/superfund/williamdicklagoons) and Blosenski Landfill (see www.epa.gov/superfund blosenski) are two separate Superfund Sites that are also located in West Cain Township. They are separate and distinct sites from the Old Wilmington Road Groundwater Superfund Site with their own remedies and community outreach efforts. Outreach efforts to the surrounding communities of these sites is ongoing. Comment #18 Comment: During the public meeting, a question was raised as to how the remedy selection process works. Response: EPA issues a Proposed Remedial Action Plan (proposed plan) which describes the remedy alternatives discussed in the Feasibility Study for the site and presents EPA's preferred alternative. The Remedial Project Manager, in this case Irene Shandruk, developed the Proposed Plan in consultation with EPA technical support and legal teams for the Site. The Plan was also reviewed by the Office of Land and Emergency Management at EPA Headquarters. EPA's support agency for this Site, PADEP, is involved with all aspects of this process and provides input on how EPA proceeds. PADEP reviewed and provided comments on the Proposed Plan prior to final review and approval at EPA. The final review and the approval to issue the Proposed Plan was at the regional level with the Director of the Superfund and Emergency Management Division. Then the proposed plan is made publicly available, along with the AR file for the site, and EPA solicits feedback from the public on the preferred alternative. There is typically a 30-day public comment period during which time the public can submit their comments, questions, and concerns on the proposed plan. EPA also typically holds a public meeting where the plan is formally presented to the community and a Q& A session is held. Taking all of the public comments into 39 ------- consideration, EPA then selects the remedy in a Record of Decision. Comment #19 Comment: Questions were raised at the public meeting regarding EPA's definition of "a site" and what are the Site's boundaries0 Response: The Site boundaries are defined by where Site-related hazardous substances were deposited, stored, disposed of, or placed, or otherwise came to be located. Before EPA had gathered enough data to characterize the nature and extent of contamination, roads and natural landmarks were used to describe the approximate boundaries of the Site. In various Site documents, boundary descriptions are conservative and may have been described as being West Mattson Hollow Road to the southeast. Old Mill Road to the southwest, property owned by the Natural Lands Trust to the west, and Airport Road to the north and northeast. Given that the VOC and 1,4-dioxane plumes are now well defined, the boundaries for what is considered "the Site" have been redefined to extend over the source areas and groundwater contaminant plumes. Additionally, as investigation into emerging contaminants continues, the Site boundaries may be redefined again in response to new data. Comment #20 Comment: During the public meeting, a resident stated: "What I don't understand is that you're saying it's in the groundwater. That whole area is on a hill. Groundwater water flows downhill. How can you say the other areas on the bottom of that hill are not affected? We flood constantly. The ground is very wet at the bottom of that hill. I mean, I live in the swamp. So how can you say that it's not affected?" This was followed by discussion of groundwater flow and placement of monitoring wells. Response: Surface water flows downhill. Groundwater is underground, and its flow is influenced by fractures and faults in the bedrock. For this Site, there is a network of complex fractures and faults in the bedrock which cause the flow of groundwater to generally be eastward. Flow of surface waters that may be impacting areas downgradient are not related to the flow of groundwater beneath the surface. Placement of monitoring wells is determined by groundwater flow because the direction of the groundwater flow is the direction in which the contamination is flowing. The wells have been placed around the perimeter of the groundwater contaminant plumes. Comment #21 Comment: During the public meeting, a resident asked: "Let's say you were a homeowner and you had a couple of acres of ground and you wanted to subdivide and build a house on it, would the Health Department give you a permit to drill a well right now in that area?" Response: EP A does not issue permits for wells and is unable to speak on behalf of the Chester County Health Department (CCHD). CCHD requirements for water supply wells in an area of concern are provided in Section 501.15 of the CCHD Rules and Regulations. In addition, ICs are a component of the Selected Remedy, and one specific IC prohibits the installation of any new groundwater wells until remediation standards and protectiveness 40 ------- have been achieved, unless EPA, in consultation with PADEP, gives prior written approval for such installation. Comment #22 Comment: During the public comment period, a resident asked: "When will all of this start? How long will it take to finish?" Response: EP A estimates that the construction of the water line will begin two to three years from issuance of this Interim ROD. As stated in response to comment #18 above, the ROD is the document in which EPA selects the remedy for a Site, after the requisite public comment period. After the Interim ROD is issued, EPA will begin the design phase, during which the Interim Remedy's design details are developed. Finally, EPA develops a plan for actual construction of the selected interim remedy. During construction, EPA-installed treatment systems will continue to be maintained and monitored. Once construction is completed, EPA will no longer maintain or monitor those treatment systems. It is estimated that actual construction of the water line will take two to three months, followed by an additional couple of months of restoration work on roads and residents" properties. Comment #23 Comment: During the public meeting, one resident inquired whether there is a "geotech report" for the Site that will confirm the location of all the rock. Response: EPA maintains an AR file for this Site with all the supporting documentation for its selected remedy. The AR file contains a Remedial Investigation report and a Supplemental Remedial Investigation report that discusses the Site's geology and hydrogeology, which includes data concerning below surface geologic features such as bedrock. The AR file for this Site can be accessed via the internet at www.epa.gov/superfund/oldwilmingtonroad. Comment #24 Comment: During the public meeting, one resident commented on the contamination remaining in the groundwater and whether any action can be taken on it. Response: Remediation of the groundwater is possible and such remediation will be addressed as part of OU-2. EPA had planned to propose alternatives for remediation of the groundwater until emerging contaminants, specifically per- and polyfluoroalkyl substances (PFAS), were discovered. This resulted in EPA taking this interim remedial action and initiating a new investigation to delineate the nature and extent of the PF AS along with the remaining contaminated media at the Site Comment #25 Comment: During the public meeting, one resident asked if these contaminants can pass into farm animals that people consume. 41 ------- Response: No, VOCs such as tetrachloroethene (PCE) and trichloroethene (TCE) and SVOCs such as 1,4-dioxane are highly unlikely to pass into farm animals used for consumption at current concentrations. For more information on PCE, see https://wwwn.cdc.gov/TSP/substances/ToxSubstance.aspx?toxid=48For more information on TCE, see https://wwwn.cdc. gov/TSP/substances/ToxSubstance.aspx?toxid=30. For more information on 1,4-dioxane, see. With regards to PFAS, the risk assessment community and the health community, in general, are still learning about its effects on livestock and food products. For more information on PFAS, see https://www.epa.gov/pfas/pfas- explained. Comment #26 Comment: During the public meeting, one resident asked: "This plume is uphill from the Coatesville Reservoir which is only 2.5 to 3 miles away. Is that a concern?" Response: No, this is not a concern. We have monitoring well data bounding the extent of the plumes, and the extent of the plumes is not near the Coatesville Reservoir. See the Supplemental Remedial Investigation for more information. It can be accessed via the internet at www.epa.gov/superfund/oldwilmingtonroad. Comment #27 Comment: During the public meeting, some concerns were raised with regards to the waterline, such as length of time for construction and a boil water advisory issued in the recent past. Response: As stated in response to comment #22 above, EPA estimates that the water line will be installed in two to three years after the issuance of this Interim ROD. During construction, EPA-installed treatment systems will continue to be maintained and monitored. With regards to the boil water advisory, each entity supplying public water is required to follow the public notification requirements regulated by PADEP and EP A if there is any event where drinking water could become contaminated. But if this occurs, required precautions and safety measures are triggered, which includes boil water advisories until safe drinking water has been restored. See https://www.dep.pa. gov/OurCommonWealth/pages/Article. aspx?post=8 42 ------- APPENDIX C ARARs and TBCs FOR SELECTED REMEDY 43 ------- Table C-l: Chemical-Specific ARARs Requirement Maximum Contaminant Levels (MCLs) promulgated under the Safe Drinking Water Act of 1974, as amended, 42 U.S.C. §§ 300f et seq. (SDWA) Citation 40 C.F.R. §§141.61 and 141.62 Status Relevant and appropriate Pennsylvania Statewide Health Standards promulgated under the Land Recycling and Environmental Remediation Standards Act of May 19, 1995, P.L. 4, No. 2, 35P.S. §§ 6026.101 et seq. (Act 2) 25 Pa. Code §§ 250.304, and Appendix B, Tables 1 and 2 Relevant and Appropriate Description Establishes maximum contaminant levels (MCLs) for certain organic and inorganic contaminants, which are enforceable standards for public water supply systems having at least 15 service connections or being used by at least 25 persons. Statewide Health Standards are Medium- Specific Concentrations (MSCs) of regulated substances associated with groundwater, used for cleanups under PA law. Relation to Remedy Groundwater in the area of concern is an underground source of drinking water. MCLs are relevant and appropriate as in situ cleanup standards for groundwater that is or may be used for drinking water. EPA is not selecting a remedy to clean-up groundwater on the Site with this action, however, PA American Water, an off-site public water system, is still required to meet all applicable Safe Drinking Water Act requirements, including treatment of drinking water to MCL standards. While MCLs are not ARARs for such off-Site treatment, they are chemical-specific ARARs for the purpose of determining the scope of the AOC (i.e., which residents will be offered connection to the newly constructed waterline. The MSCs for COCs in drinking water are relevant and appropriate standards when there are no MCLs. While MSCs are not ARARs for such off-Site treatment, they are chemical- specific ARARs for the purpose of determining the scope of the AOC (i.e., which residents will be offered connection to the newly constructed waterline. Requirement Regulations promulgated under Section 106 of the National Historical Citation 36 C.F.R. Part 800 Table C-2: Location-Specific ARARs Status Description Applicable : Section 106 of the NHPA requires any Federal undertaking to consider the ! effect the activity may have on any 44 Relation to Remedy The water line construction meets the definition of an "undertaking" under 36 C.F.R. § 800.16(y). Accordingly, ------- Preservation Act of 1966, as amended (NHPA), 54 U.S.C. § 306108 Regulations under the : 16 U.S.C. § 703 and Applicable Migratory Bird Treaty Act of : 50 C.F.R. § 10.13 1918, as amended ("MBTA"), 16 U.S.C. § 703 : Consultation requirements 50 C.F.R. §§ 402.01- Applicable under Section 7 of the 402.17 Endangered Species Act of 1973, as amended ("ESA"), 16U.S.C. § 1536 PA regulations promulgated 17 Pa. Code § 45.12 : Applicable under the Wild Resource ; and 45.31 Conservation Act, Act of historic property, and the Federal Advisory Council on Historic Preservation must be given a reasonable opportunity to comment on the undertaking. The regulations at 36 C.F.R. Part 800 describe the actions a Federal agency must take to meet its statutory responsibilities under the NHPA, including consultation with the Pennsylvania State Historic Preservation Office (SHPO) and the Federal Advisory Council on Historic Preservation to determine if the Federal undertaking will affect cultural or historic sites on or eligible for the National Register of Historic Places. Section 703 of the MBTA prohibits the take (including killing, capturing, selling, trading, and transport) of protected migratory bird species that are native to the United States without prior authorization by the U.S. Fish and Wildlife Service ("FWS"). The species protected as migratory birds under the MBTA are listed at 50 C.F.R. § 10.13. The ESA requires consultation between the U.S. Fish and Wildlife Service ("FWS") and other Federal agencies to ensure that any agency action authorized, funded, or carried out by these agencies is not likely to jeopardize the continued existence of any endangered or threatened species or result in the destruction or adverse modification of habitat of such species. Provides for general restrictions regarding threatened or endangered plant species. 45 EPA will comply with Section 106 of the NHPA and the regulations implementing it. EPA will consult with the Federal Advisory Council and SHPO prior to the remedial action. Appropriate actions will be taken during the water line construction to ensure that no on-Site migratory birds, listed at 50 C.F.R. § 10.13, or their nests are adversely affected. There is potential presence of threatened species in the surface waters of this part of Chester County, PA. Consultation will occur with FWS to ensure the water line construction does not jeopardize the continued existence of any endangered or threatened species or result in the destruction or adverse modification of habitat of these species. There is potential presence of endangered plant species in Chester County, PA. The water line construction will comply with the ------- June 23, 1982, P.L. 597, No. 170, 32P.S. §§ 5301 etseq. substantive requirements of these restrictions, as necessary. Requirement West Cain Township Ordinance #13 Chester County Health Department Rules and Regulations - Chapter 500 (Water Wells, Nuisances, Sewage and Liquid Waste), §501 (Water Well Construction, Monitoring Wells, And Individual, Semi- Public and Public Water Supplies and Geothermal Boreholes). Stormwater regulations promulgated under the CWA, 33 U.S.C. §§ 1251 et seq. Table C-3: Action-Specific ARARs and TBCs Citation : Status Description Section 8 TBC Sets forth requirements for http://www.westcaln.org/files/1 : water supply to mobile home 31149345.pdf . ; parks. Available at https://www.chesco,ore/D ocumentCenter/View/429/ 501?bidld= §§ 501.16.1; 501.16.2; 501.16.4; 501.16.5; 501.17 TBC 40 C.F.R. § 122.26(c)( 1 )(ii) Relevant and Appropriate Sets forth requirements for well permit applications, decommissioning of wells, and water source replacement in Chester County, PA. This regulation requires the operator of a new stormwater discharge associated with small construction activity, as defined by 40 C.F.R. § 122.26(b)(15), to maintain certain information about the nature of the site, the nature of on-site activities, proposed best management practices to control pollutants in stormwater during and after construction activities, an Relation to Remedy This substantive, non-administrative requirements for replacing the common residential supply well at the mobile home park located at Donovan Drive will be considered in connection with installation of proposed water line. The substantive, non- administrative provisions of Chapter 500, Section 501, of the CCHD Rules and Regulations will be considered for replacing residential wells with a public water line, the decommissioning of residential wells and the retention of residential wells upon connection to public water for the on-Site part of the remedial action. No permits, licenses or similar administrative requirements will be obtained. Best management practices to control COCs in stormwater during the construction of the water line will be implemented. Information required to be maintained under this regulation will be reported to appropriate PA and Federal officials. No permit will be obtained3. See 42 U.S.C. § 9621(e) and 40 C.F.R. § 300.400(e) (No Federal, state, or local permit is required for the on-site portion of a response action conducted under Section 104 of CERCLA. The term on-site means the a real extent of contamination and all suitable areas in very close proximity to the contamination necessary for implementation of the response action.) 46 ------- Standards applicable to generators of hazardous waste under RCRA PA criteria for identification of hazardous waste, promulgated under the SWMA PA standards applicable to generators of hazardous waste, promulgated under the SWMA 40 C.F.R. §§ 262.16; 262.18(a)-(c); 262.20- Applicable 262 262.. 27; oin/4 aiim 25 Pa. Code §§ 261a. 1, 261a.2, 261.a.3 (b), 261.a.7 Applicable 25 Pa. Code §§ 262a.14(a), 262a.16, 262a.18, 262a.21 265a Subchapter I4 app: estimate of the runoff coefficient of the site, and the name(s) of the receiving water(s). These regulations establish standards for generators of hazardous waste, as defined by 40 C.F.R. § 261.3. Criteria for identification and management of hazardous waste. These criteria incorporate Federal regulations at 40 C.F.R. Part 261, except as expressly provided. These standards are substantive requirements for persons who generate a hazardous waste, as defined by 25 Pa. Code § 261a.3(b). Any generation of a hazardous waste (POET filters) in the area of concern, as defined by 40 C.F.R. § 261.3, during the remedial action will comply, as appropriate, with the substantive parts of these standards. During the remedial action, sampling of waste (POETS soil / waste excavated during water line construction, and other wastes generated) will be conducted to ensure proper classification and on- site handling of solid wastes generated. Any generation of a hazardous waste in the area of concern, as defined by 25 Pa. Code § 261a.3(b), during the remedial action will comply with the substantive standards related to the action. PA regulations concerning residual waste management, promulgated under the PA SWMA PA requirements for erosion and sediment control promulgated under the Clean Streams Law 25 Pa. Code §§ 287.54(a)(1)- (2), (c), and (d); 299.111; 299.112(a)-(c); 299.114(a) and (b); 299.115(a)-(b); 299.116; 299.121(a), (b), (d), and (e); and 299.131(b) 25 Pa. Code §§ 102.2; 102.4(b)(l)-(5); 102.8(b)-(f) and (n); 102.11(a) and (b); 102.22 Applicable Applicable These regulations set forth the requirements for persons who generate, manage, or handle residual waste These regulations require persons conducting earth- disturbance activities to develop, implement, and maintain best management plans ("BMPs") to minimize the During the remedial action, sampling for residual waste will be conducted to ensure proper classification and onsite handling for possible residual waste during the implementation of remedial action. An erosion and sediment-control plan will be developed and implemented to minimize erosion and sedimentation to Rock Run or other streams during the construction of the water line. No permit or administrative approval will be obtained. 4 25 Pa. Code § 262a.10 incorporates by reference 40 C.F.R. Part 262, except as expressly provided in 25 Pa. Code Chapter 262a. 47 ------- PA Standards for Contaminants, Chapter 123 promulgated under the Air Pollution Control Act, Act of Jan 8, (1960) 1959, PL. 2119, No. 787, as amended, 35 P.S. §§ 4001 et seq. (ACPA) Safe Drinking Water Regulations, Chapter 109 25 Pa. Code §123.1(c); 123.2 Applicable Public Water Supply Manual, Part II, Community System Design Standards, May 6, 2006 25 PA Code Chapter 109, ; Applicable Subchapter F. (Design and Construction Standards), §§ 109.601, 109.602 (a)(1) and (2), 109.607, 109. 608, and 109.609(a) Document Number: TBC 383-2125-108 Erosion and Sediment Pollution Control Program Manual, March 2012 Document Number: TBC 363-2134-008 PA Stormwater Best Management Practices Manual, December 30, 2006 Document Number: 363-0300-002 TBC potential for accelerated erosion and sedimentation and to manage post- construction stormwater. Sets forth requirements for fugitive emissions; establishes specific limitations for particulate matter, odor, and visible emissions. Fugitive dust emissions generated during the construction of the water line that involves excavation will be controlled No permit will be obtained but all substantive requirements of a permit will be met. Only those substantive portions relevant to design and construction of proposed water line and/or laterals will be used, as appropriate. Provides detailed design and construction standards for all community water supplies. Provides guidance and procedures on ways to minimize accelerated erosion and resulting sediment pollution to surface waters. Ensures effective stormwater management to minimize the adverse impacts of stormwater on groundwater and surface water resources. Only those substantive portions relevant to design and construction of proposed water line and/or laterals will be considered as performance standards to be met, as appropriate. The manual will be considered, as appropriate, for minimizing erosion and sedimentation to Rock Run or other streams during the construction of the water line. The manual will be considered, as appropriate, for best management practices to control stormwater during the construction of the water line. No permit will be obtained. 48 ------- APPENDIX D PERFORMANCE STANDARDS FOR RESIDENTIAL WELL WATER 49 ------- PERFORMANCE STANDARDS FOR RESIDENTIAL WELL WATER OLD WILMINGTON ROAD SIT] E, WEST CALI V TOWNSHIP, CI HESTER COUNTY, PENNSYLVANIA Chemical of Concern PADEP ACT 2 Groundwater MSCs (2) (fig/L) SDWA MCLs (1) (fig/L) EPA RSLs'3' Resident Tapwater (fig/L) Exposure Point Concentration (EPC) (fig/L) Range of Background Cone. (fig/L) Performance Standard (fig/L) Rationale for Performance Standard Residential T etrachloroethene 5 5 20.5 65.7 ND 5 Federal SDWA MCL Trichloroethene 5 5 1.4 10.6 ND 5 Federal SDWA MCL 1.4-Dioxane 6.4 NA 4.6 3.84 ND 6.4 PADEP MSC 2-Hexanone NA NA 19 41 ND 19 EPA RSL Bis(2- ethylhexyl Iphthalatc 6 NA 56 11 ND 6 PADEP MSC Caprolactam NA NA 4,950 2800 ND 4,950 EPA RSL Aluminum NA NA 10,000 57,655 103- 139 10,000 EPA RSL Arsenic 10 10 0.52 12.8 0.46 J 10 Federal SDWA MCL Cobalt 10 NA 3 63.9 5.6-6.6 10 PADEP MSC Iron NA NA 7,000 45,400 14.5 J-21.6 J 7,000 EPA RSL Lead 5 15 7.5 23.1 0.2 J 5 PADEP MSC Manganese 300 NA 215 2,525 243 - 308 300 PADEP MSC Thallium 2 2 0.1 0.539 ND 2 Federal SDWA MCL Notes: 1. Safe Drinking Water Act (SDWA) maximum contaminant levels (MCLs) regulate organic and inorganic constituents in public drinking water supplies (EPA 816-F-09-004). May 2009. 2. PADEP ACT 2 = Pennsylvania Department of Environmental Protection Statewide Health Standards Medium-Specific Concentrations (MSCs) for Groundwater (11/20/21): https://www.dep.pa.gov/Busmess/Land/LandRecvcling/Standards-Guidance-Procedures/Pages/Statewide-Health-Standards.aspx. 3. EPA Regional Screening Levels (RSLs) for Resident Tap water Table (TR=lE-05, HQ=0.5), May 2022. https://semspiib.epa.aov/work/HO/4Q2389.pdf 4. Exposure Point Concentration (EPC) is the concentration of contaminant to represent the level of reasonable maximum exposure anticipated for that medium. 5. EPA RSLs are non-mandatory water quality standards. 6. Abbreviations: J = estimated concentration; ND = not detected; NA = not available; (ig/L = microgram per liter 50 ------- APPENDIX E CLEANUP LEVELS FOR VAPOR INTRUSION 51 ------- CLEANUP LEVELS FOR VAPOR INTRUSION OLD WILMINGTON ROAD SITE, WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA coc EPA RSLs/VISLs for Resident1 (|ig / m3) PADEP Statewide Health Standard for Resident2 (|ig / m3) Residential Cleanup Level ((ig / in3) Indoor Air RSL TR = 1E-5 HQ=1 Subslab Vapor VISL TR = 1E-5 HQ=1 AF=0.03 Indoor Air Screening Values Sub-Slab Soil Gas Screening V allies Indoor Air Subslab Vapor TCE 2.1 70 2.1 80 2.1 70 PCE 42 1,390 42 1,600 42 1,390 Chloroform 1.2 41 1.1 41 1.1 41 Vinyl chloride 1.7 56 0.81 31 0.81 31 Notes: 1. EPA Regional Screening Level (RSL) Resident Ambient Air and Composite Worker Ambient Air Tables (TR=lE-5, HQ=1), November 2021, (https://semspub.epa.gov/work/HQ/401655.pdf); VISLs derived using EPA Vapor Intrusion Screening Level Calculator (https://www.epa .gov/vaporintrusion/vapor-intrusion-screening-level-calculator). 2. PADEP Land Recycling Program Technical Guidance Manual for Vapor Intrusion into Buildings from Groundwater and Soil under Act 2. Document number: 261-0300-101. Vapor Intrusion Screening Value Tables, November 20,2021. PADEP= Pennsylvania Department of Environmental Protection. 3. EPA RSLs, VISL, and PADEP soil gas and indoor air screening values are non-mandatory standards. 52 ------- APPENDIX F RAGS PART D TABLES 53 ------- RAGS Part D Table 1 Selection of Exposure Pathways ------- TABLE 1 SELECTION OF EXPOSURE PATHWAYS OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe Medium Exposure Medium Exposure Point Receptor Population Receptor Age Exposure Route Type of Analysis Rationale for Selection or Exclusion of Exposure Pathway Current Surface Soil Surface Soil Old Wilmington Road Industrial Workers Adult Ingestion Dermal Quant Quant Industrial workers may have contact with surface soil while at the site. Residents Child Ingestion Dermal Quant Quant Current residents may be exposed to surface soil during outdoor activities. Adult Ingestion Dermal Quant Quant Air Old Wilmington Road Industrial Workers Adult Inhalation Quant Industrial workers may be exposed to fugitive dust and volatile emissions from surface soil during work activities. Residents Child Inhalation Quant Current residents may be exposed to fugitive dust and volatile emissions from surface soil during outdoor activities. Adult Inhalation Quant Groundwater Groundwater Old Wilmington Road Industrial Workers Adult Ingestion Dermal None None Current industrial workers are not exposed to groundwater. Residents Child Ingestion Dermal None None Currently there is no complete pathway. Residents with impacted wells have treatment systems. Adult Ingestion Dermal None None Air Old Wilmington Road Industrial Workers Adult Inhalation None Current industrial workers are not exposed to groundwater. Residents Child Inhalation None Currently there is no complete pathway. Residents with impacted wells have treatment systems. Adult Inhalation None Vapor Intrusion Industrial Workers Adult Inhalation Quant Industrial workers may be exposed to COPCs that have migrated from groundwater through building foundations and into indoor air. Residents Child Inhalation Quant Residents may be exposed to COPCs that have migrated from groundwater through building foundations and into indoor air. Adult Inhalation Quant Surface Water Surface Water Old Wilmington Road Residents Child Ingestion Dermal None None No COPCs were identified for surface water. Adult Ingestion Dermal Quant Quant Sediment Sediment Old Wilmington Road Residents Child Ingestion Dermal Quant Quant Residents may be exposed to sediment impacted by COPCs from the site. Adult Ingestion Dermal Quant Quant Future Surface/ Subsurface Soil Surface/ Subsurface Soil Old Wilmington Road Construction Workers Adult Ingestion Dermal Quant Quant Construction workers may be exposed to surface soil and subsurface soil during excavation activities. Industrial Workers Adult Ingestion Dermal Quant Quant Industrial workers may have contact with surface soil. Residents Child Ingestion Dermal Quant Quant Future residents may be exposed to subsurface soil that was mixed with surface soil during construction activities. Adult Ingestion Dermal Quant Quant ------- TABLE 1 SELECTION OF EXPOSURE PATHWAYS OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe Medium Exposure Medium Exposure Point Receptor Population Receptor Age Exposure Route Type of Analyses Rationale for Selection or Exclusion of Exposure Pathway Future Surface/ Subsurface Soil Air Old Wilmington Road Construction Workers Adult Inhalation Quant Construction workers may be exposed to fugitive dust and volatile emissions from surface and subsurface soil. Industrial Workers Adult Inhalation Quant Industrial workers may be exposed to fugitive dust and volatile emissions from surface soil during work activities. Residents Child Inhalation Quant Future residents may be exposed to fugitive dust and volatile emissions from surface and subsurface soil that was mixed during construction activities. Adult Inhalation Quant Groundwater Groundwater Old Wilmington Road Construction Workers Adult Ingestion Dermal Quant Quant Construction workers may have contact with groundwater during excavation activities. Industrial Workers Adult Ingestion Dermal Quant Quant Industrial workers may have contact with groundwater if groundwater is used as a drinking water supply. Residents Child Ingestion Dermal Quant Quant Residents may have contact with groundwater if groundwater is used as a drinking water supply. Adult Ingestion Dermal Quant Quant Air Old Wilmington Road Construction Workers Adult Inhalation Quant Construction workers may be exposed to COPCs that have volatilized from groundwater during excavation activities. Industrial Workers Adult Inhalation Quant Industrial workers may be expected to be exposed to COPCs that have volatilized from groundwater while showering. Residents Child Inhalation None Child residents are not expected to be exposed to COPCs that have volatilized from groundwater. Adult Inhalation Quant Adult residents may be expected to be exposed to COPCs that have volatilized from groundwater while showering. Vapor Intrusion Industrial Workers Adult Inhalation Quant Industrial workers may be exposed to COPCs that have migrated from groundwater through building foundations and into indoor air. Residents Child Inhalation Quant Residents may be exposed to COPCs that have migrated from groundwater through building foundations and into indoor air. Adult Inhalation Quant Surface Water Surface Water Old Wilmington Road Residents Child Ingestion Dermal Quant Quant No COPCs were identified for surface water. Adult Ingestion Dermal Quant Quant Sediment Sediment Old Wilmington Road Residents Child Ingestion Dermal Quant Quant Residents may be exposed to sediment impacted by COPCs from the site. Adult Ingestion Dermal Quant Quant Definitions: COPC = Chemical of potential concern. Quant = Quantitative. ------- RAGS Part D Table 2 Occurrence, Distribution and Selection Of Chemicals of Potential Concern ------- LIST OF TABLES RAGS PART D TABLE 2 OCCURRENCE, DISTRIBUTION AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN Table No. 2.1 Surface Soil - Direct Contact 2.2 Surface Soil - Migration from Soil to Groundwater 2.3 Surface/Subsurface Soil - Direct Contact 2.4 Surface/Subsurface Soil - Migration from Soil to Groundwater 2.5 Gorundwater - Direct Contact 2.6 Groundwater - Vapor Intrusion 2.7 Surface Water 2.8 Sediment ------- Scenario Timeframe: Current/Future Medium: Surface Soil Exposure Medium: Surface Soii TABLE 2.1 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SURFACE SOIL OLD WILMINGTON ROAD SITE PAGE 1 OF 2 CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Freguency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Residential Soilp' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection'5' Volatile Organic Compounds | 78-93-3 2-Butanone 26 43 ug/kg OWR-SS-AR19-00.5-601 2/73 o o 43 ND 2,700,000 N NA NA No BSL 67-64-1 Acetone 2 930 ug/kg OWR-SS-AR19-00.5-601 12/73 4- 10 930 10 6,100,000 N NA NA No BSL 79-20-9 Methyl Acetate 6 7 ug/kg OWR-SS-AR 10-00.5-601 2/73 o o 7 ND 7,800,000 N NA NA No BSL 75-09-2 Methylene Chloride 9 39 ug/kg OWR-SS-AR16-00.5-601, OWR-SS-BP01-00.5-601 73/73 39 10-30 35,000 N NA NA No BSL 127-18-4 Tetrachloroethene 2 2 ug/kg OWR-SS-JK08-00.5-601, OWR-SS-JK98-00.5-601 1/73 o o 2 ND 8,100 N NA NA No BSL Semi volatile Organic Compounds | 91-57-6 2-Methylnaphthalene 9,200 9,200 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 9,200 ND 24,000 N NA NA No BSL 83-32-9 Acenaphthene 520 520 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 520 ND 360,000 N NA NA No BSL 120-12-7 Anthracene 400 400 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 400 ND 1,800,000 N NA NA No BSL 100-52-7 Benzaldehyde 71 71 ug/kg OWR-SS-TY06-00.5-601 1/19 330- 330 71 ND 170,000 C NA NA No BSL 56-55-3 Benzo(a)anthracene 57 930 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 930 ND 1,100 C NA NA No BSL 50-32-8 Benzo(a)pyrene 68 820 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 820 ND 110 c NA NA Yes ASL 205-99-2 Benzo(b)fluoranthene 90 820 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 820 47 1,100 c NA NA No BSL 191-24-2 Benzo(g,h,i)perylene 47 110 ug/kg OWR-SS-JK98-00.5-601 2/19 330- 330 110 ND 180,000 N(7) NA NA No BSL 207-08-9 Benzo(k)fluoranthene 69 600 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 600 ND 11,000 c NA NA No BSL 85-68-7 Benzyl Butyl Phthalate 57 340 ug/kg OWR-SS-TP04-00.5-601 3/19 330- 330 340 200 290,000 C NA NA No BSL 92-52-4 Biphenyl (Diphenyl) 1,200 1,200 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 1,200 ND 4,700 N NA NA No BSL 117-81-7 Bis(2-Ethylhexyl) Phthalate 45 1,100 ug/kg OWR-SS-LF08-00.5-601 17/19 330- 330 1,100 75 - 690 39,000 C NA NA No BSL 218-01-9 Chrysene 100 1,200 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 1,200 52 - 320 110,000 C NA NA No BSL 132-64-9 Dibenzofuran 510 510 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 510 ND 7,300 N NA NA No BSL 84-74-2 di-n-Butyl Phthalate 43 590 ug/kg OWR-SS-TP02-00.5-601 3/19 330- 330 590 56 630,000 N NA NA No BSL 206-44-0 Fluoranthene 41 1,700 ug/kg OWR-SS-LF08-00.5-601 9/19 330- 330 1,700 54 - 500 240,000 N NA NA No BSL 86-73-7 Fluorene 740 740 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 740 ND 240,000 N NA NA No BSL 193-39-5 lndeno(1,2,3-cd)pyrene 41 150 ug/kg OWR-SS-JK98-00.5-601 3/19 330- 330 150 ND 1,100 C NA NA No BSL 91-20-3 Naphthalene 9,800 9,800 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 9,800 ND 3,800 C NA NA Yes ASL 86-30-6 N-Nitrosodiphenylamine 780 780 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 780 ND 110,000 c NA NA No BSL 85-01-8 Phenanthrene 37 2,900 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 2,900 290 180,000 N(7) NA NA No BSL 129-00-0 Pyrene 48 1,900 ug/kg OWR-SS-LF08-00.5-601 8/19 330- 330 1,900 55 - 440 180,000 N NA NA No BSL Pesticides/PCBs | 5103-71-9 alpha-Chlordane 18 140 ug/kg OWR-SS-BP91-00.5-601 2/19 1.7-1.7 140 ND 1,700 C(8) NA NA I No | BSL 60-57-1 Dieldrin 4.8 110 ug/kg OWR-SS-LF08-00.5-601 2/19 3.3-3.3 110 11 34 C NA NA na ASL 1031-07-8 Endosulfan Sulfate 5.7 5.7 ug/kg OWR-SS-TP02-00.5-601 1/19 3.3-3.3 5.7 ND 47,000 N(9) NA NA No BSL 72-20-8 Endrin 6.5 6.5 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 6.5 ND 1,900 N NA NA No BSL 7421-93-4 Endrin Aldehyde 82 82 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 82 ND 1,900 N(10) NA NA No BSL 53494-70-5 Endrin Ketone 18 18 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 18 ND 1,900 N(10) NA NA No BSL 5103-74-2 gamma-Chlordane 3.5 100 ug/kg OWR-SS-BP91-00.5-601 3/19 1.7-1.7 100 2.4-2.6 1,700 C(8) NA NA No BSL 76-44-8 Heptachlor 2.1 2.1 ug/kg OWR-SS-BP91-00.5-601 1/19 1.7-1.7 2.1 ND 130 C NA NA No BSL 1024-57-3 Heptachlor Epoxide 2.1 18 ug/kg OWR-SS-BP91-00.5-601 3/19 1.7-1.7 18 3 70 C NA NA No BSL 72-54-8 p,p-DDD 13 13 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 13 ND 190 N NA NA No BSL 72-55-9 p.p-DDE 29 29 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 29 ND 2,000 C NA NA No BSL 50-29-3 p,p-DDT 11 26 ug/kg OWR-SS-LF08-00.5-601 3/19 3.3-3.3 26 11 - 18 1,900 C NA NA No BSL 11097-69-1 PCB-1254 44 46 ug/kg OWR-SS-LF01-00.5-601, OWR-SS-TP02-00.5-601 3/19 33-33 46 51 - 250 120 N NA NA No BSL Inorganics 7429-90-5 Aluminum 3,030 16,100 mg/kg OWR-SS-LF08-00.5-601 20/20 16,100 4,940 - 14,200 7,700 N NA NA ASL 7440-36-0 Antimony 0.74 JL 37.1 L mg/kg OWR-SS-TP02-00.5-601 10/20 3.5- 12 37.1 1.1 JL- 1.9 JL 3.1 N NA NA ASL 7440-38-2 Arsenic 1.8 J 8.1 mg/kg OWR-SS-BP91-00.5-601 20/20 8.1 3.6 - 7.9 0.68 C NA NA ASL 7440-39-3 Barium 40.1 J 145 mg/kg OWR-SS-LF08-00.5-601 20/20 145 61.9 - 118 1,500 N NA NA No BSL 7440-41-7 Beryllium 0.16 J 0.84 mg/kg OWR-SS-HF01-00.5-601 20/20 0.84 0.15 J - 0.95 J 16 N NA NA No BSL 7440-43-9 Cadmium 0.13 J 3.5 mg/kg OWR-SS-LF08-00.5-601 6/20 1 - 1 3.5 0.81 J - 2.1 7.1 N NA NA No BSL 7440-70-2 Calcium 289 J 83,300 mg/kg OWR-SS-TP01-00.5-601 20/20 83,300 256 J - 17,500 NA NA NA No NUT 7440-47-3 Chromium 7.3 79.5 mg/kg OWR-SS-BP91-00.5-601 21/21 79.5 11.6 - 164 12,000 N(11) NA NA No BSL 7440-48-4 C 14.1 mg/kg OWR-SS-JK02-00.5-601 20/20 14.1 3.3 - 7.8 J 2.3 N NA NA ASL 7440-50-8 C llff 1 5.4 4,530 J mg/kg OWR-SS-AR07-00.5-601 20/20 4,530 5.7 - 267 J 310 N NA NA ASL 7439-89-6 Ir 9 I 4,120 49,400 mg/kg OWR-SS-LF08-00.5-601 20/20 49,400 9,340 - 173,000 5,500 N NA NA ASL 7439-92-1 L kwlliiMiiM 12.5 L 1,650 L mg/kg OWR-SS-TP02-00.5-601 20/20 1,650 26.1 - 969 L 200 (12i NA NA ASL 7439-95-4 iMagnesium 1 430 J 51,300 mg/kg OWR-SS-TP01-00.5-601 20/20 51,300 736 - 6,840 NA NA NA HnoH NUT 7439-96-5 Manganese 37.2 632 mg/kg OWR-SS-TY06-00.5-601 20/20 632 204 - 1570 180 N NA NA Yes ASL 7439-97-6 I Mercury 0.06 J 0.42 mg/kg OWR-SS-LF08-00.5-601 6/20 o o 0.42 0.07 J - 0.21 !1.1 NI NA NA i No BSL Exposure Point ------- Scenario Timeframe: Current/Future Medium: Surface Soil Exposure Medium: Surface Soii TABLE 2.1 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SURFACE SOIL OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Frequency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Residential SoilP) Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection'5' OWR jlnorganics (Continued) | 7440-02-0 Nickel 4.7 J 35 mq/kq OWR-SS-LF08-00.5-601 20/20 35 4.7 - 70.6 150 N NA NA No BSL 7440-09-7 Potassium 484 J 1,180 J mq/kq OWR-SS-LF07-00.5-601 20/20 1,180 504 J - 1,050 J NA NA NA No NUT 7782-49-2 Selenium 0.79 JK 2.5 mg/kg OWR-SS-LF08-00.5-601 7/20 1 - 1 2.5 1.1 J - 3.4 39 N NA NA No BSL 7440-22-4 Silver 0.21 J 2.3 J mq/kq OWR-SS-LF08-00.5-601 18/20 2-2 2.3 0.26 J - 3 39 N NA NA No BSL 7440-23-5 Sodium 112 296 J mg/kg OWR-SS-AR07-00.5-601 20/20 296 108 J - 236 J NA NA NA No NUT 7440-62-2 Vanadium 6.5 J 44.6 mg/kg OWR-SS-JK02-00.5-601 20/20 44.6 16.9 - 63.4 39 N NA NA ASL 7440-66-6 Zinc 21.4 2,450 mg/kg OWR-SS-LF08-00.5-601 20/20 2,450 22.5 - 984 2,300 N NA NA ASL 57-12-5 iCyanide 0.07 1.6 mg/kg OWR-SS-LF08-00.5-601 12/20 o o 1.6 0.06 JL-0.66 JL I 2.3 N I NA NA i No I BSL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - Background data is presented for information purposes only and was not used in the selection of COPCs. 5 - USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag) correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag). 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level. 7 - Value is for pyrene. 8 - Value is for chlordane. 9 - Value is for endosulfan. 10 - Value is for endrin. 11 - Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium. 12 - USEPA, 2016.Updated Scientific Considerations for Lead in Soil Cleanups, December. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value K = Analyte present. Reported value may be biased high. Actual values is expected to be lower. L = Analyte present. Reported value may be biased low. mg/kg = milligrams per kilogram N = Noncarcinogen NA = Not Applicable/Not Available ug/kg = micrograms per kilogram Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient ------- Scenario Timeframe: Current/Future Medium: Surface Soil Exposure Medium: Surface Soii TABLE 2.2 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - MIGRATION FROM SUBSURFACE SOIL TO GROUNDWATER OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Exposure Point CAS Number Minimum Concentration'1 Maximum Concentration'1 Sample of Maximum Concentration Frequency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4, USEPA RSL Migration from Soil to Groundwater'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection*5' 78-93-3 |2-Butanone j 26 43 ug/kg OWR-SS-AR19-00.5-601 2/73 0 0 43 ND ssbbbbbbbbJ^b^bb 410 N NA NA No No BSL 67-64-1 Acetone 2 930 ug/kg OWR-SS-AR19-00.5-601 12/73 4- 10 930 10 NA NA ASL 79-20-9 i Methyl Acetate | 6 7 ug/kg OWR-SS-AR 10-00.5-601 2/73 0 0 7 ND NA NA BSL 75-09-2 I 9 39 ug/kg OWR-SS-AR16-00.5-601, OWR-SS-BP01-00.5-601 73/73 39 10-30 2.7 N NA NA ASL 127-18-' | j 2 2 ug/kg OWR-SS-JK08-00.5-601, OWR-SS-JK98-00.5-601 1/73 0 0 2 ND 1.8 N NA NA ASL Semi volatile Organic Compounds 91-57-6 2-Methylnaphthalene 9,200 9,200 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 9,200 ND 550 N NA NA m&m No ASL 83-32-9 Acenaphthene 520 520 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 520 ND NA NA BSL 120-12-7 Anthracene 400 400 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 400 ND 5,800 N NA NA No BSL 100-52-j 71 71 uq/kq OWR-SS-TY06-00.5-601 1/19 330- 330 71 ND 4.1 C NA NA ASL 56-55-3 57 930 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 930 ND 11 C NA NA ASL 50-32-8 68 820 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 820 ND 29 C NA NA ASL 205-99-2 SHH 90 820 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 820 47 300 C NA NA ASL 191-24-2 Benzo(g,h,i)perylene 47 110 ug/kg OWR-SS-JK98-00.5-601 2/19 330- 330 110 ND 1,300 N(7) NA NA No BSL 207-08-9 Benzo(k)fluoranthene 69 600 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 600 ND 2,900 C NA NA No BSL 85-68-7 Benzyl Butyl Phthalate 57 340 ug/kg OWR-SS-TP04-00.5-601 3/19 330- 330 340 200 240 C NA NA ASL 92-52-4 Biphenyl (Diphenyl) 1,200 1,200 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 1,200 ND 0.87 N NA NA ASL 117-81-7 Bis(2-Ethylhexyl) Phthalate 45 1,100 ug/kg OWR-SS-LF08-00.5-601 17/19 330- 330 1,100 75 - 690 1,300 C NA NA No BSL 218-01-9 Chrysene 100 1,200 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 1,200 52 - 320 9,000 C NA NA No BSL 132-64-9 Dibenzofuran 510 510 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 510 ND 15 N NA NA i ASL 84-74-2 di-n-Butyl Phthalate 43 590 ug/kg OWR-SS-TP02-00.5-601 3/19 330- 330 590 56 230 N NA NA ASL 206-44-0 iFluoranthene j 41 1,700 ug/kg OWR-SS-LF08-00.5-601 9/19 330- 330 1,700 54 - 500 ^8^00N ! 980 C NA NA BSL I 86-73-7 | Fluorene I 740 | 740 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 740 ND NA NA ASL I 193-39-5 !lndeno(1,2,3-cd)pyrene j 41 I 150 ug/kg OWR-SS-JK98-00.5-601 3/19 330- 330 150 ND NA NA BSL 91-20-3 Naphthalene 9,800 9,800 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 9,800 ND NA NA ASL 86-30-6 N-Nitrosodiphenylamine 780 780 ug/kg OWR-SS-LF08-00.5-601 1/19 330- 330 780 ND NA NA ASL 85-01-8 Phenanthrene 37 2,900 ug/kg OWR-SS-LF08-00.5-601 5/19 330- 330 2,900 290 NA NA ASL 129-00-0 Pyrene 48 1,900 uq/kq OWR-SS-LF08-00.5-601 8/19 330- 330 1,900 55 - 440 NA NA ASL (Pesticides/PCBs 5103-71-9 alpha-Chlordane 18 140 ug/kg OWR-SS-BP91-00.5-601 2/19 1.7-1.7 140 ND 2.7 C NA NA ASL 60-57-1 Dieldrin 4.8 110 ug/kg OWR-SS-LF08-00.5-601 2/19 3.3-3.3 110 11 0.071 C NA NA ASL 1031-07-8 Endosulfan Sulfate 5.7 5.7 ug/kg OWR-SS-TP02-00.5-601 1/19 3.3-3.3 5.7 | ND \ 140 N(9) NA NA No BSL 72-20-8 Endrin 6.5 6.5 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 6.5 ND ! 9.2 N mmmm NA NA No BSL 7421-93-4 Endrin Aldehyde 82 82 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 82 ND 10) NA NA ASL 53494-70-5 Endrin Ketone 18 18 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 18 ND 9.2 N(10i 2.7 c'8i 0.12 C 0.028 C 1.5 N 11 C 2 C NA NA ASL 5103-74-2 gamma-Chlordane 3.5 100 ug/kg OWR-SS-BP91-00.5-601 3/19 1.7- 1.7 100 2.4-2.6 NA NA Yes ASL 76-44-8 Heptachlor 2.1 2.1 ug/kg OWR-SS-BP91-00.5-601 1/19 1.7-1.7 2.1 ND NA NA Yes ASL 1024-57-3 Heptachlor Epoxide 2.1 18 ug/kg OWR-SS-BP91-00.5-601 3/19 1.7-1.7 18 3 NA NA ASL 72-54-8 p,p-DDD 13 13 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 13 ND NA NA No ASL 72-55-9 p,p-DDE 29 29 ug/kg OWR-SS-LF08-00.5-601 1/19 3.3-3.3 29 ND NA NA ASL i 50-29-3 ip,p-DDT j 11 | 26 ug/kg OWR-SS-LF08-00.5-601 3/19 3.3-3.3 26 11 - 18 NA NA BSL 11097-69-1 PCB-1254 44 46 ug/kg OWR-SS-LF01-00.5-601, OWR-SS-TP02-00.5-601 3/19 33-33 46 51 - 250 NA NA ASL Inorganics mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg OWR-SS-LF08-00.5-601 QWR-SS-TP02-00.5-601 OWR-SS-BP91-00.5-601 OWR-SS-LF08-00.5-601 OWR-SS-HF01-00.5-601 QWR-SS-LF08-00.5-601 OWR-SS-TP01-00.5-601 4,940 - 14,200 1.1 JL- 1.9 JL 0.15 J - 0.95 J 256 J - 17,500 7440-47-3 Chromium mg/kg OWR-SS-BP91-00.5-601 mg/kg OWR-SS-JK02-00.5-601 mg/kg OWR-SS-AR07-00.5-601 mg/kg OWR-SS-LF08-00.5-601 9,340 - 173,000 mg/kg mg/kg mg/kg QWR-SS-TP02-00.5-601 OWR-SS-TPQ1-00.5-601 QWR-SS-TY06-00.5-601 OWR-SS-LF08-00.5-601 ------- Scenario Timeframe: Current/Future Medium: Surface Soil Exposure Medium: Surface Soii TABLE 2.2 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - MIGRATION FROM SUBSURFACE SOIL TO GROUNDWATER OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Frequency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Migration from Soil to Groundwater'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection'5' OWR jlnorganics (Continued) 7440-02-0 Nickel 4.7 J 35 mq/kq OWR-SS-LF08-00.5-601 20/20 35 4.7 - 70.6 2.6 N NA NA Yes ASL 7440-09-7 Potassium 484 J 1,180 J mq/kq OWR-SS-LF07-00.5-601 20/20 1,180 504 J - 1,050 J ! NA NA NA I No NUT 7782-49-2 Selenium 0.79 JK 2.5 mg/kg OWR-SS-LF08-00.5-601 7/20 1 - 1 2.5 1.1 J - 3.4 0.052 N NA NA Yes ASL 7440-22-4 Silver 0.21 J 2.3 J mq/kq OWR-SS-LF08-00.5-601 18/20 2-2 2.3 0.26 J - 3 0.08 N NA NA Yes ASL I 7440-23-5 jSodium 112 296 J mg/kg OWR-SS-AR07-00.5-601 20/20 296 108 J - 236 J ! NA NA NA i No NUT 7440-62-2 Vanadium 6.5 J 44.6 mg/kg OWR-SS-JK02-00.5-601 20/20 44.6 16.9 - 63.4 8.6 N NA NA Yes ASL 7440-66-6 Zinc 21.4 2,450 mg/kg OWR-SS-LF08-00.5-601 20/20 2,450 22.5 - 984 37 N NA NA Yes ASL 57-12-5 Cyanide 0.07 1.6 mg/kg OWR-SS-LF08-00.5-601 12/20 o o 1.6 0.06 JL-0.66 JL 0.0015 N NA NA Yes ASL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - Background data is presented for information purposes only and was not used in the selection of COPCs. 5 - USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag) correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag). 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level. 7 - Value is for pyrene. 8 - Value is for chlordane. 9 - Value is for endosulfan. 10 - Value is for endrin. 11 - Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium. 12 - Value is MCL based soil screening level. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value K = Analyte present. Reported value may be biased high. Actual values is expected to be lower. L = Analyte present. Reported value may be biased low. mg/kg = milligrams per kilogram N = Noncarcinogen NA = Not Applicable/Not Available ug/kg = micrograms per kilogram Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient NTX = No toxicity criteria ------- Scenario Timeframe: Current/Future Medium: Subsurface Soil Exposure Medium: Subsurface Soii TABLE 2.3 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SUBSURFACE SOIL OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Freguency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Residential SoilP) Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection'5' OWR Semivolatile Organic Compounds | 117-81-7 Bis(2-Ethylhexyl) Phthalate 44 J 630 ug/kg OWR-SB-4DP1-17-201 12/18 330- 330 630 NA 39,000 C NA NA No BSL 84-66-2 Diethyl Phthalate 110 J 110 J ug/kg OWR-SB-4DP1-17-201 1/18 330- 330 110 NA 5,100,000 N NA NA No BSL inorganics 7429-90-5 Aluminum 273 21,500 mq/kq OWR-SB-4DP10-20-201 18/18 21,500 NA Mfflmmmmiiimim® NA NA Yes ASL 7440-36-0 Antimony 0.69 JL 1.1 JL mg/kg OWR-SB-4DP10-20-201 4/18 12- 12 1.1 NA 3.1 N NA NA No BSL 7440-38-2 Arsenic 1.8 JK 4 K mg/kg OWR-SB-2TP9-1-201 5/18 2-2 4 NA 0.68 C NA NA Yes ASL 7440-39-3 Barium 3.4 J 84 mg/kg OWR-SB-4DP10-20-201 18/18 84 NA 1,500 N NA NA No BSL 7440-41-7 Beryllium 0.061 J 1.3 mg/kg OWR-SB-4DP10-20-201 7/18 0.069- 0.29 1.3 NA 16 N NA NA No BSL 7440-70-2 Calcium 4.3 JL 1,020 J mq/kq OWR-SB-2TP6-12-201 17/18 723.5- 1000 1,020 NA NA NA NA No NUT 7440-47-3 Chromium 0.63 J 20.1 mg/kg OWR-SB-2TP9-1-201 17/18 0.25-0.25 20.1 NA 12,000 N(7) NA NA No BSL 7440-48-4 Cobalt 0.23 J 17.6 mg/kg OWR-SB-4DP10-20-201 11/18 o o 17.6 NA 2.3 N NA NA gggjggg ASL 7440-50-8 ! Copper 0.16 J 84.9 mg/kg OWR-SB-4DP10-20-201 18/18 84.9 NA j 310 N | NA NA ran BSL 7439-89-6 Iron 289 42,000 mg/kg OWR-SB-4DP10-20-201 18/18 42,000 NA NA NA ASL 7439-92-1 Lead 0.61 L 13.5 mg/kg OWR-SB-1TP9-15-201 18/18 13.5 NA j 200 (8) | NA NA No BSL 7439-95-4 Magnesium 18.6 J 13,900 mq/kq OWR-SB-4DP10-20-201 17/18 13- 13 13,900 NA I NA | NA NA j No NUT 7439-96-5 Manganese 2.1 J 379 J mg/kg OWR-SB-2TP6-12-201 16/18 0.56-0.67 379 NA 180 N NA NA Yes ASL 7440-02-0 Nickel 0.31 J 15.2 mg/kg OWR-SB-4DP10-20-201 14/18 8-8 15.2 NA 150 N NA NA No BSL 7440-09-7 Potassium 57.8 J 14,200 J mq/kq OWR-SB-4DP10-20-201 18/18 14,200 NA NA NA NA No NUT 7782-49-2 Selenium 1.4 L 1.4 L mg/kg OWR-SB-1 TP7/8-13-201 1/18 1 - 1 1.4 NA 39 N NA NA No BSL 7440-28-0 Thallium 1.8 JK 5.6 mg/kg OWR-SB-4DP10-20-201 9/18 1.45-2 5.6 NA 0.078 N NA NA ASL 7440-62-2 Vanadium 0.24 J 52.4 mg/kg OWR-SB-4DP10-20-201 18/18 52.4 NA 39 N NA NA ASL i 7440-66-6 iZinc 0.32 JL 45.8 mg/kg OWR-SB-4DP10-20-201 16/18 4-4 45.8 NA I 2,300 N I NA NA I No I BSL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - No background data available for subsurface soil. 5 - USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag) correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag). 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level. 7 - Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium. 8 - USEPA, 2016.Updated Scientific Considerations for Lead in Soil Cleanups, December. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value K = Analyte present. Reported value may be biased high. Actual values is expected to be lower L = Analyte present. Reported value may be biased low. mg/kg = milligrams per kilogram N = Noncarcinogen NA = Not Applicable/Not Available ug/kg = micrograms per kilogram Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient ------- Scenario Timeframe: Current/Future Medium: Subsurface Soil Exposure Medium: Subsurface Soii TABLE 2.4 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - MIGRATION FROM SUBSURFACE SOIL TO GROUNDWATER OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Freguency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Migration from Soil to Groundwater'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale tor Contaminant Deletion or Selection'5' OWR Semi volatile Organic Compounds | 117-81-7 Bis(2-Ethylhexyl) Phthalate 44 J 630 ug/kg OWR-SB-4DP1-17-201 12/18 330- 330 630 NA 1,300 C NA NA No BSL 84-66-2 Diethyl Phthalate 110 J 110 J ug/kg OWR-SB-4DP1-17-201 1/18 330- 330 110 NA 610 N NA NA No BSL Inorganics 7440-36-0 0.69 JL 1.1 JL mg/kg OWR-SB-4DP10-20-201 4/18 12- 12 1.1 NA 0.035 N NA NA ASL 7440-38-2 1.8 JK 4 K mq/kq OWR-SB-2TP9-1-201 5/18 2-2 4 NA 0.0015 C NA NA ASL 7440-39-3 2 4 J 84 mg/kg OWR-SB-4DP10-20-201 18/18 84 NA 16 N NA NA ASL 7440-41-7 Beryllium 0.061 J 1.3 mg/kg OWR-SB-4DP10-20-201 7/18 0.069- 0.29 1.3 NA r 1.9 N NA NA No BSL 7440-70-2 Calcium 4.3 JL 1,020 J mg/kg OWR-SB-2TP6-12-201 17/18 723.5- 1000 1,020 NA NA NA NA No NUT 7440-47-3 Chromium 0.63 J 20.1 mg/kg OWR-SB-2TP9-1-201 17/18 0.25-0.25 20.1 NA 4,000,000 N(7) NA NA No BSL 7440-48-4 Cobalt 0.23 J 17.6 mq/kq OWR-SB-4DP10-20-201 11/18 o o 17.6 NA 0.027 N NA NA ASL 7440-50-8 Copper 0.16 J 84.9 mq/kq OWR-SB-4DP10-20-201 18/18 84.9 NA 2.8 N NA NA ASL 7439-89-6 Iron 289 42,000 mg/kg OWR-SB-4DP10-20-201 18/18 42,000 NA 35 N NA NA ASL 7439-92-1 Lead 0.61 L 13.5 mg/kg OWR-SB-1TP9-15-201 18/18 13.5 NA 14(8) NA NA ! No BSL 7439-95-4 Magnesium 18.6 J 13,900 mg/kg OWR-SB-4DP10-20-201 17/18 13- 13 13,900 NA NA NA NA jNo NUT 7439-96-5 Manganese 2.1 J 379 J mg/kg OWR-SB-2TP6-12-201 16/18 0.56-0.67 379 NA 2.8 N NA NA ASL 7440-02-0 Nickel 0.31 J 15.2 mg/kg OWR-SB-4DP10-20-201 14/18 8-8 15.2 NA 2.6 N NA NA ASL I 7440-09-7 |Potassium 57.8 J 14,200 J mg/kg OWR-SB-4DP10-20-201 18/18 14,200 NA i NA NA NA ! No NUT 7782-49-2 Selenium 1.4 L 1.4 L mg/kg OWR-SB-1 TP7/8-13-201 1/18 1 - 1 1.4 NA 0.052 N NA NA Yes ASL 7440-28-0 Thallium 1.8 JK 5.6 mg/kg OWR-SB-4DP10-20-201 9/18 1.45-2 5.6 NA 0.0014 N NA NA Yes ASL 7440-62-2 Vanadium 0.24 J 52.4 mg/kg OWR-SB-4DP10-20-201 18/18 52.4 NA 8.6 N NA NA Yes ASL 7440-66-6 Zinc 0.32 JL 45.8 mg/kg OWR-SB-4DP10-20-201 16/18 4-4 45.8 NA 37 N NA NA Yes ASL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - No background data available for subsurface soil. 5 - USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag) correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag). 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level 7 - Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium. 8 - Value is MCL based soil screening level. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value K = Analyte present. Reported value may be biased high. Actual values is expected to be lower L = Analyte present. Reported value may be biased low. mg/kg = milligrams per kilogram N = Noncarcinogen NA = Not Applicable/Not Available ug/kg = micrograms per kilogram Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient ------- OCCURRENCE, DISTRIBUTION, Scenario Timeframe: Current/Future Medium: Groundwater Exposure Medium: Groundwater TABLE 2.5 SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH GROUNDWATER OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Frequency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Tap water'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection*6' OWR Volatile Organic Compounds | 71-55-6 1,1,1-Trichloroethane 0.11 J 10 ug/L OWR-MW03-0816 23/61 0.5-50 10 ND 800 N NA NA No BSL 76-13-1 1,1,2-Trichloro-1,2,2-Trifluoroethane 0.82 5 ug/L OWR-MW-08S-0816-RS 7/47 0.5-50 5 ND 1,000 N NA NA No BSL 75-34-3 1,1-Dichloroethane 0.15 J 2.6 ug/L OWR-MW08S-0117 37/65 0.5-50 2.6 ND 2.8 C NA NA No BSL 75-35-4 1,1-Dichloroethene 0.35 J 3.9 ug/L OWR-MW-08S-0816-RS 6/61 0.5-50 3.9 ND 28 N NA NA No BSL 106-46-7 1,4-Dichlorobenzene 0.11 J 0.11 J ug/L OWR-MW10D-0117 1/61 0.5-50 0.11 ND 0.48 C NA NA No BSL 7-Butanone 2 J 1,300 ug/L OWR-MW17-PORT1-110617 9/61 5-500 1,300 ND 560 N NA NA ikygl ASL 591-78-6 /-Hexanone 41 41 uq/L OWR-MW17-PORT1-110617 1/61 5-500 41 ND 3.8 N NA NA W9 ASL 108-10-1 4-Methyl-2-Pentanone 0.58 J 1.3 J ug/L OWR-MW17-PORT1-0117 2/61 5-500 1.3 ND 630 N NA NA No BSL 67-64-1 Acetone 2.7 J 91 J uq/L OWR-MW17-PORT1-110617 21/62 5-500 91 6-8.8 1,400 N NA NA No BSL 75-15-0 Carbon Disulfide 0.31 J 14 uq/L OWR-MW13-0816 14/63 0.5-50 14 ND 81 N NA NA No BSL 108-90-7 Chlorobenzene 0.12 J 0.12 J uq/L OWR-MW-06-0815 1/61 0.5-50 0.12 ND 7.8 N NA NA No BSL 67-66-3 Chloroform 5.4 9.4 uq/L OWR-MW-01-0815 2/61 0.5-50 9.4 ND 0.22 C NA NA Yes ASL 74-87-3 Chloromethane 0.11 J 0.53 J ug/L OWR-MW06-0117 8/61 0.5-50 0.53 ND 19N NA NA No BSL 156-59-2 cis-1,2-Dichloroethene 0.19 J 6.6 ug/L OWR-MW17-PORT4-110617 20/63 0.5-50 6.6 ND 3.6 N NA NA Yes ASL - m,p-Xylene 0.1 J 0.1 J ug/L OWR-MW13-0117 1/61 0.5-50 0.1 ND 19 N(7) NA NA No BSL 79-20-9 Methyl Acetate 0.77 22 uq/L OWR-MW17-PORT4-0117 9/62 0.5-50 22 ND 2,000 N NA NA No BSL 1634-04-4 Methyl Tert-Butyl Ether 0.23 J 15 uq/L OWR-MW-10S-0815 43/62 0.5-50 15 0.52-0.82 14 C NA NA Yes ASL 75-09-2 Methylene Chloride 0.12 J 1.4 J- ug/L O W R- M W18- PO R T2-0816 4/62 0.5-50 1.4 ND Tin NA NA No BSL 95-47-6 o-Xylene 0.11 J 0.11 J ug/L OWR-MW14-PORT2-0117 1/61 0.5-50 0.11 ND 19 N NA NA No BSL 127-18-4 Tetrachloroethene 0.13 J 190 uq/L OWR-MW-05-0815 29/63 0.5-50 190 0.15 J 4.1 N NA NA Yes ASL 108-88-3 Toluene 0.1 J 13 ug/L OWR-MW-23-PORT3-0816-RS 27/67 0.5-50 13 ND 110 N NA NA No BSL 79-01-6 Trichloroethene 0.16 J 27 uq/L OWR-MW-08S-0816-RS 29/63 0.5-50 27 ND 0.28 N NA NA Yes ASL 75-69-4 Trichlorofluoromethane 0.1 J 0.75 ug/L OWR-MW-08S-0816-RS 7/47 0.5-50 0.75 ND 520 N NA NA No BSL 75-01-4 Vinyl Chloride 0.16 J 0.57 uq/L OWR-MW21-0117 3/61 0.5-50 0.57 ND IWflfWH'TT'Ti fcTW NA NA Yes ASL Semivolatile Organic Compounds 123-91-1 1.1-Dioxane 1 J 5.1 J ug/L OWR-MW17-PORT1-0117 19/64 2- 100 5.1 ND 0.46 C NA NA Yes ASL 106-44-5 4-Methylphenol 1.1 J 4.3 J ug/L OWR-MW17-PORT4-110617 5/62 10-500 4.3 ND 190 N NA NA No BSL 98-86-2 Acetophenone 1.1 J 12 ug/L OWR-MW17-PORT2-110617 5/64 10-500 12 ND 190 N NA NA No BSL 100-52-7 Benzaldehyde 1.3 J 4.9 J ug/L OWR-MW17-PORT2-110617 2/64 10-500 4.9 ND 19 C NA NA No BSL 117-81-7 Bis(2-ethylhexyl)phthalate 1.3 J 11 uq/L OWR-MW15-0816 4/64 5-250 11 ND 5.6 C NA NA Yes ASL 85-68-7 Benzyl Butyl Phthalate 1.4 J 3.2 J ug/L OWR-MW17-PORT2-0816 10/64 5-250 3.2 1.6 J-3.6 J 16 C NA NA No BSL 105-60-2 Caprolactam 3.5 J 2,800 uq/L OWR-MW17-PORT1-110617 14/64 10- 11 2,800 ND 990 N NA NA Yes ASL 84-66-2 Diethylphthalate 1.2 J 2.7 J ug/L OWR-MW17-PORT4-110617 3/64 5-250 2.7 ND 1,500 N NA NA No BSL 131-11-3 Dimethylphthalate 2.3 J 2.3 J ug/L OWR-MW-06-0815 1/64 5-250 2.3 ND NA NA NA No NTX 84-74-2 Di-N-Butylphthalate 1.2 J 41 ug/L OWR-MW18-PORT2-0816 5/64 5-250 41 1.6 J- 1.6 J 90 N NA NA No BSL 108-95-2 Phenol 2.5 J 4.3 J uq/L OWR-MW17-PORT4-110617 3/64 10-500 4.3 ND 580 N NA NA No BSL Semivolatiles-Sim 123-91-1 1,4-Dioxane 0.12 J 20 J ug/L OWR-MW18-PORT2-0816 39/50 0.4-0.5 20 0.21 J-0.58 J 0.46 C NA NA H i ASL Total Inorganics 7429-90- 14.1 J 301,000 ug/L OWR-MW-06-0815 56/59 20-20 301,000 103-139 2,000 N NA NA Yes ASL 7440-36- 0.23 J 10.2 J ug/L O W R- M W17- PO R T2- 0117 7/59 2-2 10.2 ND 0.78 N NA NA Yes ASL 7440-38- 0.07 J 60.1 ug/L O W R- M W23- PO R T2- 0117 32/59 1 - 1 60.1 0.46 J-0.46 J 0.052 C NA NA Yes ASL 7440-39- 15.2 3,310 ug/L OWR-MW23-PORT3-0816 58/59 10- 10 3,310 128-143 380 N NA NA Yes ASL 7440-41- 0.23 J 17.8 ug/L O W R- M W23- PO R T2- 0117 13/59 1 - 1 17.8 0.17 J - 0.19 J 2.5 N NA NA Yes ASL 7440-43-9 Cadmium 0.1 J 1.5 ug/L OWR-MW-06-0815 9/59 1 - 10 1.5 0.1 J-0.1 J 0.92 N NA NA Yes ASL 7440-70-2 Calcium 419 J 170,000 ug/L OWR-MW21-0117 57/59 500 - 500 170,000 2,150- 2,470 NA NA NA No NUT 7440-47-3 Chromium 2.1 546 ug/L OWR-MW06-0816 42/62 2-2 546 ND 2,200 N(8) NA NA No BSL 7440-48-4 Cobalt 0.11 J 232 ug/L OWR-MW10D-0816 51/59 1 - 1 232 5.6-6.6 0.6 N NA NA Yes ASL 7440-50-8 Copper 0.5 J 739 ug/L OWR-MW-06-0815 45/59 1.2-2 739 11.4- 13.9 80 N NA NA Yes ASL 7439-89-6 Iron 55.8 J 380,000 J uq/L OWR-MW17-PORT2-0117 49/59 42.6- 200 380,000 14.5J-21.6J 1,400 N NA NA Yes ASL 7439-92-1 Lead 0.11 J 217 ug/L OWR-MW17-PORT2-0117 32/59 1 - 1 217 0.2 J-0.2 J 15 NA NA Yes ASL i 7439-95-4 jMaqnesium 677 81,400 uq/L OWR-MW17-PORT2-0117 59/59 81,400 3,050- 3,530 ! NA NA NA I No NUT 7439-96-5 Manganese 3.8 10,900 ug/L OWR-MW10D-0816 59/59 10,900 243 - 308 43 N NA NA Yes ASL 7439-97-6 Mercury 0.021 J- 0.23 uq/L OWR-MW06-0117 17/48 0.2-2 0.23 0.25-0.71 0.063 N NA NA Yes ASL 7440-02-0 Nickel 0.4 J 368 ug/L OWR-MW-06-0815 56/59 1 - 1 368 2.9-3.3 39 N NA NA Yes ASL i 9/7/7440 iPotassium 1,210 35,100 uq/L OWR-MW13-0816 59/59 35,100 2,270- 2,390 ! NA NA I No NUT 7782-49-2 Selenium 0.49 J 15.2 ug/L O W R- M W17- PO R T2- 0816 13/59 5-50 15.2 ND 10 N NA NA Yes ASL 7440-22-4 Silver 0.029 J 4.7 uq/L OWR-MW-06-0815 10/59 1 - 1 4.7 ND 9.4 N NA NA No BSL 7440-23-5 Sodium 1,640 678,000 ug/L OWR-MW17-PORT1-0117 59/59 678,000 9,260- 12,300 NA NA |n^i NUT 7440-28-0 Ilium 0.1 J 2.3 ug/L OWR-MW23-PORT2-0117 11/59 1 - 10 2.3 ND 0.02 N NA NA ASL 7440-62-2 adium 0.19 J 93.6 ug/L OWR-MW-06-0815 31/59 1.675-5 93.6 ND 8.6 N NA NA ASL 7440-66-6 Zinc 2.9 2,020 ug/L OWR-MW14-PORT2-0816 58/59 2-2 2,020 2.8- 14.4 600 N NA NA ASL ------- OCCURRENCE, DISTRIBUTION, Scenario Timeframe: Current/Future Medium: Groundwater Exposure Medium: Groundwater TABLE 2.5 SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH GROUNDWATER OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Frequency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' USEPA RSL Tap water'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection*6' OWR Dissolved Inorganics 7429-90-5 Aluminum 12.7 J 3,920 ug/L OWR-MW-04-0815 26/54 20-20 3,920 98.6- 121 2,000 N NA NA ASL 7440-36-0 Antimony 0.35 J 6.6 uq/L OWR-MW-01-0815 8/54 2-2 6.6 ND 0.78 N NA NA ASL 7440-38-2 Arsenic 1.1 21.4 ug/L OWR-MW17-PORT3-0816 13/54 1 - 2 21.4 ND 0.052 C NA NA ASL 7440-39-3 Barium 2.4 J 215 ug/L OWR-MW10S-0816 49/54 o o 215 127-132 380 N NA NA No BSL 7440-41-7 Beryllium 0.05 J 0.87 J ug/L OWR-MW-04-0815 7/54 1 - 1 0.87 ND 2.5 N NA NA No BSL 7440-43-9 Cadmium 0.05 J 0.65 J ug/L OWR-MW-10S-0815 13/54 1 - 1 0.65 ND 0.92 N NA NA No BSL 7440-70-2 Calcium 666 89,000 ug/L OWR-MW21-0117 50/54 500 - 500 89,000 2,190-2,210 NA NA NA No NUT 7440-47-3 Chromium 0.2 J 269 ug/L OWR-MW17PORT1-20190408 24/57 2-4 76.2 ND 2,200 N(8) NA NA No BSL 7440-48-4 Cobalt 0.05 J 240 ug/L OWR-MW10D-0816 39/54 1 - 1 240 5.7-6.5 0.6 N NA NA Yes ASL 7440-50-8 Copper 2.1 62.5 ug/L OWR-MW04-0117 17/54 1 -4 62.5 10.5-10.8 ! 80 N NA NA I No BSL 7439-89-6 Iron 34.9 J 61,000 ug/L OWR-MW18-PORT2-0816 20/54 200 - 400 61,000 ND NA NA Yes ASL 7439-92-1 Lead 0.12 J- 14.2 ug/L OWR-MW03-0117 9/54 1 -1 14.2 0.19 J-0.23 J ! 15 NA NA I BSL 7439-95-4 Magnesium 220 J 26,000 ug/L OWR-MW-04-0815 49/54 500 - 500 26,000 2,960- 3,120 i NA NA NA [noJ NUT 7439-96-5 Manganese 1.4 J 13,400 ug/L OWR-MW10S-0816 51/54 1 - 1 13,400 249- 301 43 N NA NA ¦ETSB ASL 7439-97-6 Mercury 0.021 J- 0.17 J ug/L OWR-MW80-0117-D 4/43 o o 0.17 0.12 J--0.93 0.063 N NA NA ASL 7440-02-0 Nickel 0.22 J 25.5 ug/L OWR-MW10S-0816 41/54 1 - 1 25.5 2.8-3.3 39 N NA NA jNol BSL 7440-09-7 Potassium 402 J 35,800 uq/L OWR-MW13-0816 53/54 500 - 500 35,800 2,180- 2,440 NA NA NA I No NUT 7782-49-2 Selenium 0.62 J 19.7 ug/L O W R- M W17- PO R T2- 0816 10/54 5-5 19.7 ND 10 N NA NA Yes ASL I 7440-23-5 jSodium 868 336,000 ug/L OWR-MW-04-0815 54/54 336,000 8,880- 11,200 i NA NA NA I No NUT 7440-28-0 Thallium 0.06 J 0.43 J ug/L OWR-MW10S-0816 4/54 0.53- 1 0.43 ND 0.02 N NA NA Yes ASL 7440-62-2 Vanadium 0.82 J 14.3 ug/L O W R- M W17- PO R T3- 0816 11/54 0.34- 10 14.3 ND 8.6 N NA NA Yes ASL 7440-66-6 Zinc 1.3 J 1,870 J ug/L OWR-MW10D-0816 46/54 2-12.4 1,870 2.3 J - 10.7 600 N NA NA Yes ASL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - Range of concentrations in monitoring well MW-19. Background values are present for information purposes only and were not used for COPC selection. 5 - USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. RSLs for carcinogens correspond to an integrated lifetime cancer risk (ILCR) of 1E-06; RSLs for noncarcinogens correspond to a hazard quotient (HQ) of 0.1. 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level. 7 - Value is for xylenes. 8 - Hexavalent chromium was not detected in any groundwater sample, therefore total chromium was evaluated as trivalent chromium. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value J- = Analyte present but reported value may be biased low N = Noncarcinogen NA = Not Applicable/Not Available ug/L = micrograms per liter Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient NTX = No toxicity criteria ------- TABLE 2.6 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - VAPOR INTRUSION OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Groundwater Exposure Medium: Air Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concent ration'1' Units Sample of Maximum Concentration Freguency of Detection Range of Detection Limits'2' Concentration Used for Screening*3' Range of Background Concentrations'4' USEPA VISL'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection'6' OWR Volatile Organic Compounds | 71-55-6 1,1,1-Trichloroethane 0.11 J 10 uq/L OWR-MW03-0816 23/61 0.5-50 10 ND 740 N NA NA No BSL 76-13-1 1,1,2-Trichloro-1,2,2-Trifluoroethane 0.82 5 ug/L OWR-MW-08S-0816-RS 7/47 0.5-50 5 ND 24 N NA NA No BSL 75-34-3 1,1-Dichloroethane 0.15 J 2.6 ug/L OWR-MW08S-0117 37/65 0.5-50 2.6 ND 7.6 C NA NA No BSL 75-35-4 1,1-Dichloroethene 0.35 J 3.9 ug/L OWR-MW-08S-0816-RS 6/61 0.5-50 3.9 ND 20 N NA NA No BSL 106-46-7 1,4-Dichlorobenzene 0.11 J 0.11 J ug/L OWR-MW10D-0117 1/61 0.5-50 0.11 ND 2.6 C NA NA No BSL 78-93-3 2-Butanone 2 J 1,300 ug/L OWR-MW17-PORT1-110617 9/61 5-500 1,300 ND 220,000 N NA NA No BSL 591-78-6 2-Hexanone 41 41 ug/L OWR- MW17- PO RT1 -110617 1/61 5-500 41 ND 820 N NA NA No BSL 108-10-1 4-Methyl-2-Pentanone 0.58 J 1.3 J ug/L OWR-MW17-PORT1-0117 2/61 5-500 1.3 ND 56,000 N NA NA No BSL 67-64-1 Acetone 2.7 J 91 J uq/L OWR-MW17-PORT1-110617 21/62 5-500 91 6-8.8 2,300,000 N NA NA No BSL 75-15-0 Carbon Disulfide 0.31 J 14 ug/L OWR-MW13-0816 14/63 0.5-50 14 ND 120 N NA NA No BSL 108-90-7 Chlorobenzene 0.12 J 0.12 J ug/L OWR-MW-06-0815 1/61 0.5-50 0.12 ND 41 N NA NA No BSL 67-66-3 Chloroform 5.4 9.4 ug/L OWR-MW-01-0815 2/61 0.5-50 9.4 ND 0.81 C NA NA Yes ASL 74-87-3 Chloromethane 0.11 J 0.53 J ug/L OWR-MW06-0117 8/61 0.5-50 0.53 ND 26 N NA NA No BSL 156-59-2 cis-1,2-Dichloroethene 0.19 J 6.6 ug/L O W R- M W17- PO R T4-110617 20/63 0.5-50 6.6 ND NA NA NA No NTX m,p-Xylene 0.1 J 0.1 J ug/L OWR-MW13-0117 1/61 0.5-50 0.1 ND 36 N(7) NA NA No BSL 79-20-9 Methyl Acetate 0.77 22 ug/L O W R- M W17- PO R T4- 0117 9/62 0.5-50 22 ND NA NA NA No NTX 1634-04-4 Methyl Tert-Butyl Ether 0.23 J 15 ug/L OWR-MW-10S-0815 43/62 0.5-50 15 0.52-0.82 450 C NA NA No BSL 75-09-2 Methylene Chloride 0.12 J 1.4 J- ug/L OWR-MW18-PORT2-0816 4/62 0.5-50 1.4 ND 470 N NA NA No BSL 95-47-6 o-Xylene 0.11 J 0.11 J ug/L O W R- M W14- PO R T2- 0117 1/61 0.5-50 0.11 ND 49 N NA NA No BSL 127-18-4 Tetrachloroethene 0.13 J 190 ug/L OWR-MW-05-0815 29/63 0.5-50 190 0.15 J 5.8 N NA NA Yes ASL 108-88-3 Toluene 0.1 J 13 ug/L OWR-MW-23-PORT3-0816-RS 27/67 0.5-50 13 ND 1,900 N NA NA No BSL 79-01-6 Trichloroethene 0.16 J 27 ug/L OWR-MW-08S-0816-RS 29/63 0.5-50 27 ND 0.52 N NA NA Yes ASL 75-69-4 Ifrichlorofluorometh 0.1 J 0.75 ug/L OWR-MW-08S-0816-RS 7/47 0.5-50 0.75 ND I NA | NA NA I No NTX 75-01-4 Vinyl Chloride 0.16 J 0.57 ug/L OWR-MW21-0117 3/61 0.5-50 0.57 ND 0.15 C NA NA Yes ASL ISemivolatile Organic Compounds 123-91-1 1,4-Dioxane 1 J 5.1 J ug/L OWR-MW17-PORT1-0117 19/64 2- 100 5.1 ND 2,900 C NA NA No BSL 106-44-5 4-Methylphenol 1.1 J 4.3 J ug/L O W R- M W17- PO R T4-110617 5/62 10-500 4.3 ND NA NA NA No NTX 98-86-2 Acetophenone 1.1 J 12 ug/L OWR-MW17-PORT2-110617 5/64 10-500 12 ND NA NA NA No NTX 100-52-7 Benzaldehyde 1.3 J 4.9 J ug/L OWR-MW17-PORT2-110617 2/64 10-500 4.9 ND NA NA NA No NTX 117-81-7 Bis(2-ethylhexyl)phthalate 1.3 J 11 ug/L OWR-MW15-0816 4/64 5-250 11 ND NA NA NA No NTX 85-68-7 Benzyl Butyl Phthalate 1.4 J 3.2 J ug/L O W R- M W17- PO R T2- 0816 10/64 5-250 3.2 1.6 J-3.6 J NA NA NA No NTX 105-60-2 Caprolactam 3.5 J 2,800 ug/L OWR-MW17-PORT1-110617 14/64 10-11 2,800 ND NA NA NA No NTX 84-66-2 Diethyl phthalate 1.2 J 2.7 J ug/L O W R- M W17- PO R T4-110617 3/64 5-250 2.7 ND NA NA NA No NTX 131-11-3 Dimethylphthalate 2.3 J 2.3 J ug/L OWR-MW-06-0815 1/64 5-250 2.3 ND NA NA NA No NTX 84-74-2 Di-N-Butylphthalate 1.2 J 41 ug/L OWR-MW18-PORT2-0816 5/64 5-250 41 1.6 J -1.6 J NA NA NA No NTX 108-95-2 Phenol 2.5 J 4.3 J ug/L OWR-MW17-PORT4-110617 3/64 10-500 4.3 ND NA NA NA No NTX ISemivolatiles-Sim | I 123-91-1 | M,4-Dioxane i 0.12 J | I 20 J | i uq/L i O W R- M W18- PO R T2- 0816 | i 39/50 | i 0.4-0.5 | I 20 | I 0.21 J-0.58 J | i 2,900 C | i NA | i NA | i No I BSL | Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - Range of concentrations in monitoring well MW-19. Background values are present for information purposes only and were not used for COPC selection. 5 - USEPA's Vapor Intrusion Screening Level (VISL) Calculator, Accessed May 16, 2018. The noncarcinogenic values (denoted with a "N" flag) correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag). 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level. 7 - Value is for m-xylenes. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value J- = Analyte present but reported value may be biased low N = Noncarcinogen NA = Not Applicable/Not Available ug/L = micrograms per liter Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient NTX = No toxicity criteria ------- Scenario Timeframe: Current/Future Medium: Surface Water Exposure Medium: Surface Water TABLE 2.7 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SURFACE WATER OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Frequency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' Screening Toxicity Value'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection'5' OWR Volatile Organic Compounds 71-55-6 1,1,1-Trichloroethane 0.31 J 0.69 ug/L OWR-SW-06-0815 2/8 o o 0.69 ND 8,000 N NA NA No BSL 76-13-1 1,1,2-Trichloro-1,2,2-Trifluoroethane 0.2 J 0.2 J ug/L OWR-SW-06-0815 1/8 o o 0.2 ND 10,000 N NA NA No BSL 75-34-3 1,1-Dichloroethane 0.11 J 0.26 J ug/L OWR-SW-06-0815 2/8 o o 0.26 ND 28 C NA NA No BSL 74-87-3 Chloromethane 0.29 J 0.29 J ug/L OWR-SW-07-0815 1/8 o o 0.29 ND 190 N NA NA No BSL 156-59-2 cis-1,2-Dichloroethene 0.21 J 0.21 J ug/L OWR-SW-06-0815 1/8 o o 0.21 ND 36 N NA NA No BSL 1634-04-4 Methyl Tert-Butyl Ether 0.26 J 0.33 J ug/L OWR-SW-06-0815 3/8 o o 0.33 ND 140 C NA NA No BSL 75-09-2 Methylene Chloride 0.1 J 0.1 J ug/L OWR-SW-05-0815, OWR-SW-07-0815 2/8 o o 0.1 0.13 J 110 N NA NA No BSL 127-18-4 Tetrachloroethene 0.11 J 0.11 J ug/L OWR-SW-05-0815 1/8 o o 0.11 ND 41 N NA NA No BSL 108-88-3 Toluene 0.61 0.61 ug/L OWR-SW-06-0815 1/8 o o 0.61 ND 1,100 N NA NA No BSL 79-01-6 Trichloroethene 0.45 J 1.3 uq/L OWR-SW-06-0815 2/8 o o 1.3 ND 2.8 N NA NA No BSL Semivolatile Organic Compounds 131-11-3 Dimethylphthalate 2.6 J 3.6 J ug/L OWR-SW-05-0815 2/8 5-5 3.6 ND NA NA NA No NTX Total Inorganics 7429-90-5 Aluminum 50.4 351 ug/L OWR-SW-17-0815 8/8 351 74.3- 142 20,000 N NA NA No BSL 7440-38-2 Arsenic 0.19 J 0.5 J ug/L OWR-SW-06-0815 8/8 0.5 0.25 J - 0.28 J 0.52 C NA NA No BSL 7440-39-3 Barium 56.6 487 ug/L OWR-SW-05-0815 8/8 487 73.4- 77.5 3,800 N NA NA No BSL 7440-43-9 Cadmium 0.03 J 0.08 J ug/L OWR-SW-05-0815 7/8 1 -1 0.08 ND 9.2 N NA NA No BSL 7440-70-2 Calcium 2,160 30,100 ug/L OWR-SW-17-0815 8/8 30,100 5,650- 5,970 NA NA NA No NUT 7440-47-3 Chromium 2.4 J 2.4 J ug/L OWR-SW-17-0815 3/10 0.25-2 2.4 ND 22,000 N(7) NA NA No BSL 7440-48-4 Cobalt 1 J 3.7 ug/L OWR-SW-06-0815 3/8 1 - 1 3.7 ND 6 N NA NA No BSL 7440-50-8 Copper 2 J 2.6 ug/L OWR-SW-05-0815 3/8 2-2 2.6 ND 800 N NA NA No BSL 7439-89-6 Iron 222 2,000 ug/L OWR-SW-06-0815 7/8 200- 200 2,000 262 14,000 N NA NA No BSL 7439-92-1 Lead 1.1 1.2 ug/L OWR-SW-07-0815 2/8 1 - 1 1.2 ND 15 NA NA No BSL 7439-95-4 Magnesium 2,190 15,600 ug/L OWR-SW-17-0815 8/8 15,600 4,880- 5,150 NA NA NA No NUT 7439-96-5 Manganese 15.8 362 ug/L OWR-SW-05-0815 8/8 362 11.3-24 430 N NA NA No BSL 7440-02-0 Nickel 0.39 J 5.5 J ug/L OWR-SW-05-0815 8/8 5.5 0.4 J - 0.66 J 390 N NA NA No BSL 7440-09-7 Potassium 2,000 5,010 ug/L OWR-SW-17-0815 8/8 5,010 2,600- 2,800 NA NA NA No NUT 7440-23-5 Sodium 6,710 26,000 ug/L OWR-SW-06-0815 8/8 26,000 13,000- 13,800 NA NA NA No NUT 7440-28-0 Thallium 0.04 J 0.04 J ug/L OWR-SW-07-0815 1/8 1 - 1 0.04 ND 0.2 N NA NA No BSL 7440-66-6 Zinc 19.1 J + 36.1 J + ug/L OWR-SW-17-0815 6/8 o o 36.1 10 J 6,000 N NA NA No BSL Dissolved Inorganics 7429-90-5 Aluminum 3.3 J 36.2 ug/L OWR-SW-07-0815 7/8 20-20 36.2 9.6 J - 12 J 20,000 N NA NA No BSL 7440-38-2 Arsenic 0.13 J 0.34 J ug/L OWR-SW-06-0815 8/8 0.34 0.22 J - 0.25 J 0.52 C NA NA No BSL 7440-39-3 Barium 38.2 91.2 ug/L OWR-SW-17-0815 8/8 91.2 71.7-72.2 3,800 N NA NA No BSL 7440-70-2 Calcium 2,250 24,500 ug/L OWR-SW-17-0815 8/8 24,500 5,610-5,860 NA NA NA No NUT 7440-47-3 Chromium 0.07 J 1.2 J ug/L OWR-SW16-20190408 9/10 2-2 1 0.12 J - 0.18 J 22,000 N(7) NA NA No BSL 7440-48-4 Cobalt 0.08 J 2.7 ug/L OWR-SW-06-0815 8/8 2.7 0.05 J - 0.06 J 6 N NA NA No BSL 7440-50-8 Copper 0.85 J 1.6 J ug/L OWR-SW-07-0815 8/8 1.6 1.4 J - 1.5 J 800 N NA NA No BSL 7439-89-6 Iron 10.3 J 1,120 ug/L OWR-SW-06-0815 8/8 1,120 19.1 J - 21.8 J 14,000 N NA NA No BSL 7439-95-4 Magnesium 2,230 13,500 ug/L OWR-SW-17-0815 8/8 13,500 4,860- 5,390 NA NA NA No NUT 7439-96-5 Manganese 3.4 257 ug/L OWR-SW-06-0815 8/8 257 4.1 - 8 430 N NA NA No BSL 7440-02-0 Nickel 0.2 J 1.7 ug/L OWR-SW-06-0815 8/8 1.7 0.24 J - 0.3 J 390 N NA NA No BSL 7440-09-7 Potassium 1,880 5,130 ug/L OWR-SW-17-0815 8/8 5,130 2,670- 2,900 NA NA NA No NUT 7440-23-5 Sodium 6,670 24,100 ug/L OWR-SW-06-0815 8/8 24,100 13,200- 14,200 NA NA NA No NUT 7440-62-2 Vanadium 0.17 J 1.2 J ug/L OWR-SW-01-0815, OWR-SW-17-0815 8/8 1.2 0.44 J - 0.47 J 86 N NA NA No BSL 7440-66-6 Zinc 5.8 J 15.7 J ug/L OWR-SW-07-0815 8/8 15.7 5.5 J - 8.3 J 6,000 N NA NA No BSL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - Background data is presented for information purposes only and was not used in the selection of COPCs. 5 - The USEPA Regional Screening Level (May 2018) for tap water is presented. Value represents the tap water RSL multiplied by a factor of 10 for anticipated reduced exposures to surface water. Before the factor is applied, the residential RSL for carcinogens corresponds to an incremental cancer risk of 1E-06 and for noncarcinogens the RSL corresponds to a target hazard quotient of 0.1. 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level 8 - Hexavalent chromium was not detected in any surface water sample, therefore total chromium was evaluated as trivalent chromium. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value J+ = Analyte present but reported value may be biased high N = Noncarcinogen NA = Not Applicable/Not Available ug/L = micrograms per liter Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient NTX = No toxicity criteria ------- Scenario Timeframe: Current/Future Medium: Sediment Exposure Medium: Sediment TABLE 2.8 OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SEDIMENT OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Exposure Point CAS Number Chemical Minimum Concentration'1' Maximum Concentration'1' Units Sample of Maximum Concentration Freguency of Detection Range of Detection Limits'2' Concentration Used for Screening'3' Range of Background Concentrations'4' Screening Toxicity Value'5' Potential ARAR/TBC Potential ARAR/TBC Source COPC Flag Rationale for Contaminant Deletion or Selection*6' OWR Volatile Organic Compounds | 75-34-3 1,1-Dichloroethane 2 J 6 J uq/kq OWR-S D06-061201 3/15 10-10 6 ND 36,000 C NA NA No BSL 75-15-0 Carbon Disulfide 2 J 2 J ug/kg OWR-SD14-061401, OWR-S D20-061401 1/15 10-10 2 ND 770,000 N NA NA No BSL 75-00-3 Chloroethane 7 J 7 J uq/kq OWR-S D06-061201 1/15 10-10 7 ND 14,000,000 N NA NA No BSL 156-59-2 cis-1,2-Dichloroethylene 4 J 4 J ug/kg OWR-SD19-061201, OWR-S D10-061301 2/15 10-10 4 ND 160,000 N NA NA No BSL 108-88-3 Toluene 3 J 24 J uq/kq OWR-S D06-061201 7/15 10-10 24 6 J - 7 J 4,900,000 N NA NA No BSL 79-01-6 Trichloroethene 2 J 2 J uq/kq OWR-S D19-061201 1/15 10-10 2 ND 4,100 N NA NA No BSL Inorganics | 7429-90-5 Aluminum 4,430 20,800 mq/kq OWR-SD10-061301 15/15 - 20,800 5,300- 11,700 77,000 N NA NA No BSL 7440-36-0 Antimony 0.99 JL 0.99 JL mq/kq OWR-SD14-061401 1/1 - 0.99 1.8 JL - 2.7 JL 31 N NA NA No BSL 7440-39-3 Barium 48.1 J 246 mq/kq OWR-S D10-061301 15/15 - 246 87.8-181 15,000 N NA NA No BSL 7440-41-7 Beryllium 0.25 J 1.8 J mq/kq OWR-S D04-061201 15/15 - 1.8 0.54 J - 1 J 160 N NA NA No BSL 7440-43-9 Cadmium 1.7 J 1.7 J mq/kq OWR-SD15-061401 1/15 0.15-1.7 1.7 ND 71 N NA NA No BSL 7440-70-2 Calcium 540 J 7,700 mq/kq OWR-S D01-061201 15/15 - 7,700 447 J- 1,050 J NA NA NA No NUT 7440-47-3 Chromium 5.8 440 mg/kg OWR-S D03-061201 17/17 - 440 6.3-14.7 120,000 N(7) NA NA No BSL 7440-48-4 Cobalt 1.5 J 34 J mq/kq OWR-SD04-061201 15/15 - 34 4.5 J- 10.6 J 23 N NA NA Yes ASL 7440-50-8 Copper 4.7 J 1,280 mq/kq OWR-SDO3-061201 15/15 - 1,280 5.7 J-39 3,100 N NA NA No BSL 7439-89-6 Iron 3,330 28,600 mq/kq OWR-SD02-061201 15/15 - 28,600 8,030-20,400 55,000 N NA NA No BSL 7439-92-1 Lead 12.5 166 mq/kq OWR-S D13-061401 15/15 - 166 9.7-18.5 400 NA NA No BSL 7439-95-4 Maqnesium 395 J 9,700 mq/kq OWR-S D02-061201 15/15 - 9,700 779 J- 1,890 J NA NA NA No NUT 7439-96-5 Manqanese 85.6 1,030 mq/kq OWR-SD04-061201 15/15 - 1,030 186-675 1,800 N NA NA No BSL 7439-97-6 Mercury 2.8 2.8 mq/kq OWR-SD06-061201 1/15 o o 2.8 ND 11 N NA NA No BSL 7440-02-0 Nickel 3.9 J 3,070 mq/kq OWR-SD03-061201 14/15 6.3-6.3 3,070 9 J - 19 J 1,500 N NA NA ASL 7440-09-7 Potassium 516 J 2,650 J mq/kq OWR-SD 10-061301 15/15 - 2,650 1,550 J-2,660 J NA NA NA No NUT 7782-49-2 Selenium 2.4 JK 3.5 L mq/kq OWR-S D17-061801 2/15 1 - 1 3.5 ND 390 N NA NA No BSL 7440-22-4 Silver 0.34 J 0.67 J mq/kq OWR-S D02-061201 7/15 2-2 0.67 0.48 J-0.75 J 390 N NA NA No BSL 7440-62-2 Vanadium 8.4 J 62.2 mq/kq OWR-SD02-061201 15/15 - 62.2 8.5 J-21.2 J 390 N NA NA No BSL 7440-66-6 Zinc 28.9 3,980 mq/kq OWR-SD 15-061401 15/15 - 3,980 27.6-60.9 23,000 N NA NA No BSL Footnotes: 1 - Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations. 2 - Values presented are sample-specific quantitation limits. 3 - The maximum detected concentration is used for screening purposes. 4 - Background values are present for information purposes only and were not used for COPC selection. 5 - The USEPA Regional Screening Level (May 2018) for residential exposures to soil is presented. Value represents the residential RSL multiplied by a factor of 10 for anticipated reduced exposures to sediment. Before the factor is applied, the residential RSL for carcinogens corresponds to an incremental cancer risk of 1E-06 and for noncarcinogens the RSL corresponds to a target hazard quotient of 0.1. 6 - The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level. 7 - Hexavalent chromium was not detected in any sediment sample, therefore total chromium was evaluated as trivalent chromium. Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the chemical was retained as a COPC. Definitions: ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered C = Carcinogen COPC = Chemical Of Potential Concern J = Estimated value K = Analyte present. Reported value may be biased high. Actual values is expected to be lower L = Analyte present. Reported value may be biased low. mg/kg = milligrams per kilogram N = Noncarcinogen NA = Not Applicable/Not Available ug/kg = micrograms per kilogram Rationale Codes: For selection as a COPC: ASL = Above Screening Level. For elimination as a COPC: BSL = Below COPC Screening Level NUT = Essential nutrient ------- RAGS Part D Table 3 Medium-Specific Exposure Point Concentration Summary ------- LIST OF TABLES RAGS PART D TABLE 3 MEDIUM-SPECIFIC EXPOSURE POINT CONCENTRATION SUMMARY Table No. Surface Soil Combined Surface/Subsurface Soil Groundwater - Industrial Workers and Residents Groundwater - Construction Workers Sediment 3.1.RME 3.2.RME 3.3.RME 3.4.RME 3.5.RME ------- TABLE 3.1.RME EXPOSURE POINT CONCENTRATION SUMMARY REASONABLE MAXIMUM EXPOSURE OLD WILMINGTON ROAD SITE Scenario Timeframe: Current ledium: Surface Soil xposure Medium: Surface Soil Exposure Point Chemical of Potential Concern Units Arithmetic Mean 95% UCL (Distribution) Maximum Concentration (Qualifier) Exposure Point Concentration Value Units Statistic Rationale OWR Benzo(a)pyrene mg/kg 0.195 0.286 (N) 0.82 0.286 mg/kg 95% KM (t) UCL ProUCL 5.1.002 Naphthalene mg/kg 0.672 (1) 9.8 9.8 mg/kg Maximum Detected Concentration (1) Dieldrin mg/kg 0.008 (1) 0.11 0.11 mg/kg Maximum Detected Concentration (1) Aluminum mg/kg 10,577 12,000 (N) 16100 12,000 mg/kg 95% Modified-t UCL ProUCL 5.1.002 Antimony mg/kg 5.28 11.3 (NP) 37.1 L 11.3 mg/kg 95% KM (Chebyshev) UCL ProUCL 5.1.002 Arsenic mg/kg 4.67 5.28 (N) 8.1 5.28 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Cobalt mg/kg 6.09 7.59 (G) 14.1 7.59 mg/kg 95% Adjusted Gamma UCL ProUCL 5.1.002 Copper mg/kg 257 1,240 (NP) 4,530 J 1,240 mg/kg 95% Chebyshev (Mean, Sd) UCL ProUCL 5.1.002 Iron mg/kg 16,329 20,200 (AN) 49,400 20,200 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Lead mg/kg 131 484 (NP) 1,650 L 131 mg/kg Arithmetic Mean Concentration (2) Manganese mg/kg 387 456 (N) 632 456 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Vanadium mg/kg 23.4 27.0 (N) 44.6 27.0 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Zinc mg/kg 185 705 (NP) 2450 705 mg/kg 95% Chebyshev (Mean, Sd) UCL ProUCL 5.1.002 Definitions: Qualifiers: AN = Approximate normal distribution. J = Estimated value. G = Gamma distribution. L = Analyte present. Reported value may be biased low. N = Normal distribution. NP = Non-parametric distribution. mg/kg = milligrams per kilogram 1 - There are less than three detected concentrations. Reliable statistics cannot be computed. The maximum concentration was used as the EPC. 2 - Mean concentration is used as exposure point concentration for evaluating exposures to lead. U.S. EPA, 1994:Guidance Manual for the Integrated Exposure Uptake Biokinetic Model for lead in Children. Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios. ------- TABLE 3.2.RME EXPOSURE POINT CONCENTRATION SUMMARY REASONABLE MAXIMUM EXPOSURE OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface/Subsurface Soil Exposure Medium: Surface/Subsurface Soil Exposure Point Chemical of Potential Concern Units Arithmetic Mean 95% UCL (Distribution) Maximum Concentration (Qualifier) Exposure Point Concentration Value Units Statistic Rationale OWR Benzo(a)pyrene mg/kg 0.180 0.252 (N) 0.82 0.252 mg/kg 95% KM (t) UCL ProUCL 5.1.002 Naphthalene mg/kg 0.425 (1) 9.8 9.8 mg/kg Maximum Detected Concentration (1) Dieldrin mg/kg 0.005 (1) 0.11 0.11 mg/kg Maximum Detected Concentration (1) Aluminum mg/kg 8499 9,940 (AN) 21,500 9940 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Antimony mg/kg 5.08 6.48 (NP) 37.1 L 6.48 mg/kg 95% KM (Chebyshev) UCL ProUCL 5.1.002 Arsenic mg/kg 3.18 3.95 (N) 8.1 3.95 mg/kg 95% KM (t) UCL 95% GROS Adjusted Gamma UCL ProUCL 5.1.002 Cobalt mg/kg 5.08 6.32 (G) 17.6 6.32 mg/kg ProUCL 5.1.002 Copper mg/kg 141 660 (NP) 4,530 J 660 mg/kg 95% Chebyshev (Mean, Sd) UCL ProUCL 5.1.002 Iron mg/kg 16220 19,200 (AN) 49,400 19,200 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Lead mg/kg 71.4 260 (L) 1,650 L 71.4 mg/kg Arithmetic Mean Concentration (2) Manganese mg/kg 232 388 (NP) 632 388 mg/kg 95% KM (Chebyshev) UCL ProUCL 5.1.002 Thallium mg/kg 1.47 2 13 (AL) 5.6 2.13 mg/kg KM Student's t ProUCL 5.1.002 Vanadium mg/kg 20.2 23.6 (N) 52.4 23.6 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Zinc mg/kg 102 380 (NP) 2,450 380 mg/kg 95% KM (Chebyshev) UCL ProUCL 5.1.002 Definitions: Qualifiers: AN = Approximate normal distribution. J = Estimated value. G = Gamma distribution. L = Analyte present. Reported value may be biased low. L = Lognormal distribution. N = Normal distribution. NP = Non-parametric distribution. mg/kg = milligrams per kilogram 1 - There are less than three detected concentrations. Reliable statistics cannot be computed. The maximum concentration was used as the EPC. 2 - Mean concentration is used as exposure point concentration for evaluating exposures to lead. U.S. EPA, 1994:Guidance Manual for the Integrated Exposure Uptake Biokinetic Model for lead in Children. Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios. ------- TABLE 3.3.RME EXPOSURE POINT CONCENTRATION SUMMARY FOR INDUSTRIAL WORKERS AND RESIDENTS REASONABLE MAXIMUM EXPOSURE OLD WILMINGTON ROAD SITE Scenario timeframe: Current/Future Medium: Groundwater Exposure Medium: Groundwater Exposure Point Chemical of Units Arithmetic 95% UCL Maximum Concentration Exposure Point Concentration Potential Concern Mean (Distribution) (Qualifier) Value Units Statistic Rationale OWR 2-Butanone ug/L (D (1) 1,300 1,300 ug/L Maximum Detected Concentration (1) 2-Hexanone ug/L (2) (2) 41 41 ug/L Maximum Detected Concentration (2) Chloroform ug/L (2) (2) 9.4 9.4 ug/L Maximum Detected Concentration (2) cis-1,2-Dichloroethene ug/L 2.53 1.88 (NP) 6.6 1.88 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Methyl Tert-Butyl Ether ug/L (3) (3) 15 15 ug/L Maximum Detected Concentration (3) Tetrachloroethene ug/L 35.2 65.7 (G) 190 65.7 ug/L 95% Gamma Adjusted KM-UCL ProUCL 5.1.002 Trichloroethene ug/L 6.07 10.6 (AL) 27 10.6 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Vinyl Chloride ug/L (2) (2) 0.57 0.57 ug/L Maximum Detected Concentration (2) 1,4-Dioxane ug/L 3.81 3.84 (G) 20 J 3.84 ug/L 95% KM Adjusted Gamma UCL ProUCL 5.1.002 Bis(2-ethylhexyl)phthalate ug/L (D (1) 11 11 ug/L Maximum Detected Concentration (1) Caprolactam ug/L (2) (2) 2,800 2,800 ug/L Maximum Detected Concentration (2) Aluminum ug/L 17,926 57,655 (NP) 301,000 57,655 ug/L 97.5% KM (Chebyshev) UCL ProUCL 5.1.002 Antimony ug/L 1.19 1.31 (G) 10.2 J 1.31 ug/L 95% KM Approximate Gamma UCL ProUCL 5.1.002 Arsenic ug/L 5.63 12.8 (AL) 60.1 12.8 ug/L 95% KM (Chebyshev) UCL ProUCL 5.1.002 Barium ug/L 315 674 (NP) 3,310 674 ug/L 95% KM (Chebyshev) UCL ProUCL 5.1.002 Beryllium ug/L 2.42 3.46 (AN) 17.8 3.46 ug/L 95% KM (t) UCL ProUCL 5.1.002 Cadmium ug/L 0.554 0.424 (NP) 1.5 0.424 ug/L 95% KM (Chebyshev) UCL ProUCL 5.1.002 Cobalt ug/L 19.8 63.9 (L) 232 63.9 ug/L KM H-UCL ProUCL 5.1.002 Copper ug/L 20.4 75.2 (AL) 739 75.2 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Iron ug/L 15,927 45,400 (L) 380,000 J 45,400 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Lead ug/L 23.1 53.5 (AL) 217 23.1 ug/L Arithmetic Mean Concentration ProUCL 5.1.002 Manganese ug/L 1,175 2,525 (L) 10,900 2,525 ug/L 95% Chebyshev(Mean, Sd) UCL ProUCL 5.1.002 Mercury ug/L 0.122 0.128 (N) 0.23 0.128 ug/L 95% KM (t) UCL ProUCL 5.1.002 Nickel ug/L 17.8 51.7 (L) 368 51.7 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Selenium ug/L 2.88 3.10 (AL) 15.2 3.1 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Thallium ug/L 0.388 0.539 (AN) 2.3 0.539 ug/L 95% KM (t) UCL ProUCL 5.1.002 Vanadium ug/L 7.59 12.3 (AG) 93.6 12.3 ug/L 95% KM Approximate Gamma UCL ProUCL 5.1.002 Zinc ug/L 147 378 (NP) 2,020 378 ug/L 95% KM Chebyshev UCL ProUCL 5.1.002 Definitions: Qualifiers: AG = Approximate gamma distribution. J = Estimated value. AL = Approximate lognormal distribution. AN = Approximate Normal distribution. G = Gamma distribution. L = Lognormal distribution. N = Normal distribution. NP = Nonparametric distribution. ug/L = Micrograms per liter. 1 - 2-Butanone, bis(2-ethylhexyl)phthalate, and caprolactam were detected at low frequency of detections and there is no descernable plume for these chemicals, therefore the maximum detected was used as the EPC for these chemicals. 2 - There were an insufficient number of detected concentrations to calculate an EPC for 2-hexanone, chloroform, and vinyl chloride, therefore the maximum detected concentration was used as the EPC for these chemicals. 3 - While methyl tert-butyl ether was detected in two thirds of the samples, it is difficult to define a plume area, therefore the maximum detected concentration was used as the EPC for methyl tert-butyl ether. Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios. ------- TABLE 3.4.RME EXPOSURE POINT CONCENTRATION SUMMARY FOR CONSTRUCTION WORKERS REASONABLE MAXIMUM EXPOSURE OLD WILMINGTON ROAD SITE [Scenario Timeframe: Current/Future Medium: Groundwater [Exposure Medium: Groundwater Exposure Point Chemical of Units Arithmetic 95% UCL Maximum Concentration Exposure Point Concentration Potential Concern Mean (Distribution) (Qualifier) Value Units Statistic Rationale OWR 2-Butanone ug/L (1) (1) 2 J 2 ug/L OWR-MW23-PORT1-0117 (1) cis-1,2-Dichloroethene ug/L (1) (1) 3.1 3.1 ug/L OWR-MW08S-0117 (1) Methyl tert-butyl ether ug/L (1) (1) 0.95 0.95 ug/L OWR-MW23-PORT1-0117 (1) Trichloroethene ug/L (1) (1) 27 27 ug/L OWR-MW-08S-0816-RS (1) 1,4-Dioxane ug/L (1) (1) 3.8 J 3.8 ug/L OWR-MW08S-0816 (1) Caprolactam ug/L (1) (1) 3.7 J 3.7 ug/L OWR-MW23-PORT1-0117 (1) Aluminum ug/L (1) (1) 114,000 114,000 ug/L OWR-MW23-PORT2-0816 (1) Antimony ug/L (1) (1) 0.46 J 0.46 ug/L OWR-MW23-PORT1-0117 (1) Arsenic ug/L (1) (1) 60.1 60.1 ug/L OWR-MW23-PORT2-0117 (1) Barium ug/L (1) (1) 3,310 3,310 ug/L OWR-MW23-PORT3-0816 (1) Beryllium ug/L (1) (1) 17.8 17.8 ug/L OWR-MW23-PORT2-0117 (1) Cadmium ug/L (1) (1) 0.45 J 0.45 ug/L OWR-MW23-PORT2-0117 (1) Cobalt ug/L (1) (1) 12.2 12.2 ug/L OWR-MW-08S-0815 (1) Copper ug/L (1) (1) 39.9 39.9 ug/L OWR-MW23-PORT2-0117 (1) Iron ug/L (1) (1) 74,900 J 74,900 ug/L OWR-MW23-PORT2-0117 (1) Lead ug/L (1) (1) 206 206 ug/L OWR-MW23-PORT2-0117 (1) Manganese ug/L (1) (1) 1,020 J 1,020 ug/L OWR-MW23-PORT2-0117 (1) Mercury ug/L (1) (1) 0.091 J 0.091 ug/L OWR-MW23-PORT2-0117 (1) Nickel ug/L (1) (1) 15.8 15.8 ug/L OWR-MW23-PORT2-0117 (1) Selenium ug/L (1) (1) 1.6 J 1.6 ug/L OWR-MW23-PORT2-0816 (1) Thallium ug/L (1) (1) 2.3 2.3 ug/L OWR-MW23-PORT2-0117 (1) Vanadium ug/L (1) (1) 30.5 J 30.5 ug/L OWR-MW23-PORT2-0117 (1) Zinc ug/L (1) (1) 343 343 ug/L OWR-MW23-PORT2-0117 (1) 1 - The maximum groundwater concentration at monitoring wells OWR-MW08S, OWR-MW08D, and OWR-MW23 is used as the exposure point concentration for construction workers. Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios. ------- TABLE 3.5.RME EXPOSURE POINT CONCENTRATION SUMMARY REASONABLE MAXIMUM EXPOSURE OLD WILMINGTON ROAD SITE [Scenario Timeframe: Current/Future Medium: Sediment [Exposure Medium: Sediment Exposure Point Chemical of Potential Concern Units Arithmetic Mean 95% UCL (Distribution) Maximum Concentration (Qualifier) Exposure Point Concentration Value Units Statistic Rationale OWR Cobalt mg/kg 10.2 14.0 (AN) 34 J 14.0 mg/kg 95% Student's-t UCL ProUCL 5.1.002 Nickel mg/kg 218 1,500 (NP) 3,070 1,500 mg/kg 97.5% KM (Chebyshev) UCL ProUCL 5.1.002 Definitions: Qualifiers: AN = Approximate Normal J = Estimated value L = Lognormal NP= Non-pa ra metric mg/kg = milligrams per kilogram Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios. ------- RAGS Part D Table 4 Values Used For Daily Intake Calculations ------- LIST OF TABLES RAGS PART D TABLE 4 VALUES USED FOR DAILY INTAKE CALCULATIONS Table No. Reasonable Maximum Exposures 4.1 .RME Construction Workers Exposed to Soil 4.2.RME Construction Workers Exposed to Air Emissions from Soil 4.3.RME Construction Workers Exposed to Groundwater 4.4.RME Construction Workers Exposed to Volatile Emissions from Groundwater 4.5.RME Industrial Workers Exposed to Soil 4.6.RME Industrial Workers Exposed to Air Emissions from Soil 4.7.RME Indistrial Workers Exposed to Groundwater 4.8.RME Industrial Workers Exposed to Volatiles While Showering 4.9.RME Child Residents Exposed to Soil 4.10.RME Child Residents Exposed to Air Emissions from Soil 4.11 RME Child Residents Exposed to Groundwater 4.12.RME Child Residents Exposed to Sediment 4.13.RME Adult Residents Exposed to Soil 4.14.RME Adult Residents Exposed to Air Emissions from Soil 4.15.RME Adult Residents Exposed to Groundwater 4.16.RME Adult Residents Exposed to Volatiles While Showering 4.17.RME Adult Residents Exposed to Sediment Central Tendency Exposures 4.1 .CTE Construction Workers Exposed to Soil 4.2.CTE Construction Workers Exposed to Air Emissions from Soil 4.3.CTE Construction Workers Exposed to Groundwater 4.4.CTE Construction Workers Exposed to Volatile Emissions from Groundwater 4.5.CTE Industrial Workers Exposed to Soil 4.6.CTE Industrial Workers Exposed to Air Emissions from Soil 4.7.CTE Indistrial Workers Exposed to Groundwater 4.8.CTE Industrial Workers Exposed to Volatiles While Showering 4.9.CTE Child Residents Exposed to Soil 4.10.CTE Child Residents Exposed to Air Emissions from Soil 4.11 .CTE Child Residents Exposed to Groundwater 4.12.CTE Child Residents Exposed to Sediment 4.13.CTE Adult Residents Exposed to Soil 4.14.CTE Adult Residents Exposed to Air Emissions from Soil 4.15.CTE Adult Residents Exposed to Groundwater 4.16.CTE Adult Residents Exposed to Volatiles While Showering 4.17.CTE Adult Residents Exposed to Sediment ------- TABLE 4.1.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS- SOILS OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Construction Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002a Intake (mg/kg/day) = IR-S Ingestion Rate 330 mg/day USEPA, 2002b RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 2002b EF Exposure Frequency 250 days/year (1) ED Exposure Duration 1 years (1) BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014 Dermal Construction Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002a Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.3 mg/cm2/event USEPA, 2002b BW xAT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 250 days/year (1) ED Exposure Duration 1 years (1) BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014 Notes: 1 - Professional judgment. Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. USEPA, 2002a:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2002b: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.2.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS - SOILS TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Construction Workers Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 8 hours/day (1) CAx ET x EF x ED EF Exposure Frequency 250 days/year (1) AT x 24 hours/day ED Exposure Duration 1 years (1) AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 CA= (1/PEF + 1 /VF) x Cs AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014 PEF Particulate Emission Factor 1.40E+06 m3/kg USEPA, 2002a VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 14.31 g/m2-s per USEPA, 2002a center of source kg/m3 Notes: 1 - Professional judgment. Sources: USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.3.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Construction Workers Adult Old Wilmington Road CGW Chemical Concentration in Groundwater Max or 95% UCL ug/L USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = CF Conversion Factor 0.001 mg/ug - IR-GW Ingestion Rate of Groundwater 0.05 L/day (1) CGW x CF x IR-GW x EF x ED EF Exposure Frequency 30 days/year (1) BWx AT ED Exposure Duration 1 years (1) BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014b Dermal Construction Workers Adult Old Wilmington Road Daevent Dermally Absorbed Dose per Event Calculated mg/cm2-event USEPA, 2004 Dermally Absorbed Dose (mg/kg/day) = Cw Chemical Concentration in Groundwater Max or 95% UCL ug/L USEPA, 2014a FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EV x EF x ED x SA CF Conversion factor 0.001 L/cm3 -- BWx AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 T Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 8 hr/event (1) B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014b DAevent= 2 x FA x Kp x Cw x CF x sqrt[(6 x x x teventypi] EV Event Frequency 1 events/day (1) EF Exposure Frequency 30 days/year (1) For organics if tevent > t* ED Exposure Duration 1 years (1) DAevent =FAx Kpx Cwx CFx [tevent/(1+B) + BW Body Weight 80 kg USEPA, 2014b 2 x t +(1 + 3B + 3B2)/(1+B2) AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014b Notes: 1 - Professional judgment. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.4.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS - GROUNDWATER TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Inhalation Construction Workers Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 VDEQ, 2018 Exposure Concentration (mg/m3) = CW Chemical concentration in water. Max or 95% UCL ug/L USEPA, 2014a CF Conversion Factor 0.001 mg/ug - CA x ET x EF x ED ET Exposure Time 8 hours/day (1) AT x 24 hours/day EF Exposure Frequency 30 days/year (1) ED Exposure Duration 1 years (1) CA = CW x CF x VF AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014b VF Volatilization Factor Calculated (mg/m3)/(mg/L) VDEQ, 2018 Notes: 1 - Professional judgment. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. VDEQ, 2018: Virginia Unified Risk Assessment Model - VURAM 2.0 User's Guide. ------- TABLE 4.5.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - INDUSTRIAL WORKERS - SOIL OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Industrial Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 100 mg/day USEPA, 2014 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 2014 EF Exposure Frequency 250 days/year USEPA, 2014 ED Exposure Duration 25 years USEPA, 2014 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 9,125 days USEPA, 2014 Dermal Industrial Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.12 mg/cm2/event USEPA, 2014 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 250 days/year USEPA, 2014 ED Exposure Duration 25 years USEPA, 2014 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 9,125 days USEPA, 2014 Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. USEPA, 2002:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.6.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - INDUSTRIAL WORKERS - SOIL TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Industrial Workers Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 8 hours/day USEPA, 2014 CAx ET x EF x ED EF Exposure Frequency 250 days/year USEPA, 2014 AT x 24 hours/day ED Exposure Duration 25 years USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 CA= (1/PEF + 1 /VF) x Cs AT-N Averaging Time (Non-Cancer) 9,125 days USEPA, 2014 PEF Particulate Emission Factor 3.24E+09 m3/kg USEPA, 1996, 2018 VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 87.36898 g/m2-s per USEPA, 1996, 2018 center of source kg/m3 Sources: USEPA, 1996: Soil Screening Level Guidance: Technical Background Document. USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA. ------- TABLE 4.7.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - INDUSTRIAL WORKERS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Ingestion Industrial Workers Adult Old Wilmington Road CGW CF Chemical Concentration in Groundwater Conversion Factor Max or 95% UCL 0.001 ug/L mg/ug USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = IR-GW Ingestion Rate of Groundwater 1.25 L/day (1) CGW x CF x IR-GW x EF x ED EF Exposure Frequency 250 days/year USEPA, 2014b BWx AT ED Exposure Duration 25 years USEPA, 2014b BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 9,125 days USEPA, 2014b Dermal Industrial Workers Adult Old Wilmington Road Daevent Cw Dermally Absorbed Dose per Event Chemical Concentration in Groundwater Calculated Max or 95% UCL mg/cm2-event ug/L USEPA, 2004 USEPA, 2014a Dermally Absorbed Dose (mg/kg/day) = FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EVx EF x ED x SA CF Conversion factor 0.001 L/cm3 BWx AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 X Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 0.25 hr/event (2) B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014b DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi] EV Event Frequency 1 events/day (2) EF Exposure Frequency 250 days/year USEPA, 2014b For organics if tevent > t* ED Exposure Duration 25 years USEPA, 2014b DAevent = FA x Kp x Cw x CF x [tevent/(1 +B) + BW Body Weight 80 kg USEPA, 2014b 2n x (1 + 3B+ 3B2)/(1 + B2)] AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 9,125 days USEPA, 2014b Notes 1 - USEPA, 2014: Frequently Asked Questions (FAQs) About Update of Standard Default Exposure Factors. 2 - Professional judgment. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.8.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Inhalation Industrial Workers Adult Old Wilmington Road S Volatile Chemical Generation Rate Derived mg/m3-min-shower Foster&Chrostowski 1987 Exposure Concentration (mg/m3)= K Mass Transfer Coefficient Derived min Foster&Chrostowski 1987 EF Exposure Frequency 250 days/year USEPA, 2014 Sx Kx EFx ED ED Exposure Duration 25 years USEPA, 2014 AT x Ra x CF Ra Air Exchange Rate 0.017 min"1 Foster&Chrostowski 1987 CF Conversion Factor 1,440 min/day - K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l Ds Shower Duration 10 min (1) Ra Dt Total Time in Bathroom 15 min (1) Fr Shower Water Flow Rate 10 L/min Foster&Chrostowski 1987 Sv Shower Room Air Volume 6 m3 Foster&Chrostowski 1987 ts Shower Dropler Drop Time 2 sec Foster&Chrostowski 1987 d Shower Droplet Diameter 1 mm Foster&Chrostowski 1987 T1 Calibration WaterTemperature 293 K Foster&Chrostowski 1987 Ts Shower Water Temperature 318 K Foster&Chrostowski 1987 ml Water Viscosity at T1 1.002 cp Foster&Chrostowski 1987 ms Water Viscosity at Ts 0.596 cp Foster&Chrostowski 1987 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Noncancer) 9,125 days USEPA, 2014 Notes: 1 - Professional judgment. Sources: USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower. ------- TABLE 4.9.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS - SOILS OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil sure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Resident Child Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 200 mg/day USEPA, 2014 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 2014 EF Exposure Frequency 350 days/year USEPA, 2014 ED1 Exposure Duration (Age 0-2) 2 years (1), USEPA, 2005, 2014 ED2 Exposure Duration (Age 2-6) 4 years (1), USEPA, 2005, 2014 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014 Dermal Resident Child Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1E-06 kg/mg - SA Skin Surface Available for Contact 2,373 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.2 mg/cm2/event USEPA, 2014 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 350 days/year USEPA, 2014 ED1 Exposure Duration (Age 0-2) 2 years (1), USEPA, 2005, 2014 ED2 Exposure Duration (Age 2-6) 4 years (1), USEPA, 2005, 2014 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014 Notes: 1 - Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0-2 years and 2-6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060. USEPA, 2002:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.10.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS SOILS TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Resident Child Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 24 hours/day USEPA, 2014 CA x ET x EF x ED EF Exposure Frequency 350 days/year USEPA, 2014 AT x 24 hours/day ED1 Exposure Duration (Age 0 - 2) 2 years (1), USEPA, 2005, 2014 ED2 Exposure Duration (Age 2 - 6) 4 years (1), USEPA, 2005, 2014 CA = (1 /PEF + 1 /VF) x Cs AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014 PEF Particulate Emission Factor 3.24E+09 m3/kg USEPA, 1996, 2018 VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 87.36898 g/m2-s per USEPA, 1996, 2018 center of source kg/m3 Notes: 1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1996: Soil Screening Level Guidance: Technical Background Document. USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA. ------- TABLE 4.11 .RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Residents Child Old Wilmington Road CGW Chemical Concentration in Groundwater Max or 95% UCL ug/L USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = CF Conversion Factor 0.001 mg/ug IR-GW Ingestion Rate of Groundwater 0.78 L/day USEPA, 2014b CGW x CF x IR-GW x EF x ED EF Exposure Frequency 350 days/year USEPA, 2014b BWx AT ED1 Exposure Duration (Age 0 - 2) 2 years (1), USEPA, 2005, 2014b ED2 Exposure Duration (Age 2 - 6) 4 years (1), USEPA, 2005, 2014b BW Body Weight 15 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014b Dermal Residents Child Old Wilmington Road Daevent Dermally Absorbed Dose per Event Calculated mg/cm2-event USEPA, 2004 Dermally Absorbed Dose (mg/kg/day) = Cw Chemical Concentration in Groundwater Max or 95% UCL ug/L USEPA, 2014a FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EV x EF x ED x SA CF Conversion factor 0.001 L/cm3 BWx AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 X Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 0.54 hr/event USEPA, 2014b B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 6,365 cm2 USEPA, 2014b DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi] EV Event Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 350 days/year USEPA, 2014b For organics if tevent > t* ED1 Exposure Duration (Age 0 - 2) 2 years (1), USEPA, 2005, 2014b DAevent = FA x Kp x Cw x CF x [tevent/(1 +B) + ED2 Exposure Duration (Age 2 - 6) 4 years (1), USEPA, 2005, 2014b 2xtx(1 + 3B + 3B2)/(1 + B2)] BW Body Weight 15 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014b Notes: 1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.12.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS - SEDIMENT OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Sediment Exposure Medium: Sediment Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Resident Child Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 200 mg/day USEPA, 2014 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless (1) EF Exposure Frequency 52 days/year (1) ED1 Exposure Duration (Age 0-2) 2 years (2), USEPA, 2005, 2014 ED2 Exposure Duration (Age 2-6) 4 years (2), USEPA, 2005, 2014 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014 Dermal Resident Child Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 2,373 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.2 mg/cm2/event USEPA, 2014 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 52 days/year (1) ED1 Exposure Duration (Age 0-2) 2 years (2), USEPA, 2005, 2014 ED2 Exposure Duration (Age 2-6) 4 years (2), USEPA, 2005, 2014 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,190 days USEPA, 2014 Notes: 1 - Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE. 2 - Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, children residents will be evaluated as two age groups, 0-2 years and 2-6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.13.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - SOILS OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil sure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Resident Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 100 mg/day USEPA, 2014 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 1989 EF Exposure Frequency 350 days/year USEPA, 2014 ED1 Exposure Duration (Age 6 - 16) 10 years (1), USEPA, 2005, 2014) ED2 Exposure Duration (Age 16 - 26) 10 years (1), USEPA, 2005, 2014) BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014 Dermal Resident Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 6,032 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.07 mg/cm2/event USEPA, 2014 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 350 days/year USEPA, 2014 ED1 Exposure Duration (Age 6 - 16) 10 years (1), USEPA, 2005, 2014) ED2 Exposure Duration (Age 16 - 26) 10 years (1), USEPA, 2005, 2014) BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014 Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. USEPA, 2002:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.14.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - SOILS TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Resident Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 24 hours/day USEPA, 2014 CA x ET x EF x ED EF Exposure Frequency 350 days/year USEPA, 2014 AT x 24 hours/day ED1 Exposure Duration (Age 6 -16) 10 years (1), USEPA, 2005, 2014) ED2 Exposure Duration (Age 16 - 26) 10 years (1), USEPA, 2005, 2014) CA = (1 /PEF + 1 /VF) x Cs AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014 PEF Particulate Emission Factor 3.24E+09 m3/kg USEPA, 1996, 2018 VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 87.36898 g/m2-s per USEPA, 1996, 2018 center of source kg/m3 Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1996: Soil Screening Level Guidance: Technical Background Document. USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA. ------- TABLE 4.15.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Ingestion Residents Adult Old Wilmington Road CGW CF Chemical Concentration in Groundwater Conversion Factor 95% UCL or Max 0.001 ug/L mg/ug USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = IR-GW Ingestion Rate of Groundwater 2.5 L/day USEPA, 2014b CGW x CF x IR-GW x EF x ED EF Exposure Frequency 350 days/year USEPA, 2014b BWx AT ED1 Exposure Duration (Age 6 -16) 10 years (1), USEPA, 2005, 2014b ED2 Exposure Duration (Age 16 - 26) 10 years (1), USEPA, 2005, 2014b BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014b Dermal Residents Adult Old Wilmington Road Daevent Dermally Absorbed Dose per Event Calculated mg/cm2-event USEPA, 2004 Dermally Absorbed Dose (mg/kg/day) = Cw Chemical Concentration in Groundwater Max or 95% UCL ug/L USEPA, 2014a DAevent x EV x EF x ED x SA FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 BWx AT CF Conversion factor 0.001 L/cm3 Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 For inorganics X Lag time Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 tevent Duration of event 0.71 hr/event USEPA, 2014b For organics if tevent <= t* B Bunge model constant Chemical Specific unitless USEPA, 2004 DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi] SA Skin Surface Available for Contact 19,652 cm2 USEPA, 2014b EV Event Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 350 days/year USEPA, 2014b For organics if tevent > t* ED1 Exposure Duration (Age 6 -16) 10 years (1), USEPA, 2005, 2014b DAevent = FA x Kp x Cw x CF x [tevent/(1 +B) + ED2 Exposure Duration (Age 16 - 26) 10 years (1), USEPA, 2005, 2014b 2xt x(1 + 3B + 3B2)/(1 +B2)] BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014b Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.16.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Residents Adult Old Wilmington Road S Volatile Chemical Generation Rate Derived mg/m3-min-shower Foster&Chrostowski 1987 Exposure Concentration (mg/m3)= K Mass Transfer Coefficient Derived min Foster&Chrostowski 1987 EF Exposure Frequency 350 showers/year USEPA, 2014 Sx Kx EFx ED ED1 Exposure Duration (Age 6-16) 10 years (1), USEPA, 2005, 2014 AT x Ra x CF ED2 Exposure Duration (Age 16-26) 10 years (1), USEPA, 2005, 2014 Ra Air Exchange Rate 0.017 min"1 Foster&Chrostowski 1987 K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l CF Conversion Factor 1,440 min/day - Ra Ds Shower Duration 42.6 min USEPA, 2014 Dt Total Time in Bathroom 60 min (2) Fr Shower Water Flow Rate 10 L/min Foster&Chrostowski 1987 Sv Shower Room Air Volume 6 m3 Foster&Chrostowski 1987 ts Shower Dropler Drop Time 2 sec Foster&Chrostowski 1987 d Shower Droplet Diameter 1 mm Foster&Chrostowski 1987 T1 Calibration WaterTemperature 293 K Foster&Chrostowski 1987 Ts Shower Water Temperature 318 K Foster&Chrostowski 1987 ml Water Viscosity at T1 1.002 cp Foster&Chrostowski 1987 ms Water Viscosity at Ts 0.596 cp Foster&Chrostowski 1987 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Noncancer) 7,300 days USEPA, 2014 Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16 - 26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). 2 - Professional judgment. Sources: USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower. ------- TABLE 4.17.RME VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - SEDIMENT OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Sediment Exposure Medium: Sediment Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Residents Adult Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 100 mg/day USEPA, 2014 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless (1) EF Exposure Frequency 52 days/year (1) ED1 Exposure Duration (Age 6 - 16) 10 years (2), USEPA, 2005, 2014 ED2 Exposure Duration (Age 16 - 26) 10 years (2), USEPA, 2005, 2014 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014 Dermal Residents Adult Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 6,032 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.07 mg/cm2/event USEPA, 2014 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 52 days/year (1) ED1 Exposure Duration (Age 6 - 16) 10 years (2), USEPA, 2005, 2014 ED2 Exposure Duration (Age 16 - 26) 10 years (2), USEPA, 2005, 2014 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 7,300 days USEPA, 2014 Notes: 1 - Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE. 2 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.1.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - SOILS OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Construction Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002a Intake (mg/kg/day) = IR-S Ingestion Rate 165 mg/day (1) RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 2002b EF Exposure Frequency 125 days/year (1) ED Exposure Duration 1 years (1) BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014 Dermal Construction Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002a Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.1 mg/cm2/event USEPA, 2004 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 125 days/year (1) ED Exposure Duration 1 years (1) BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014 Notes: 1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RM E. Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. USEPA, 2002a:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2002b: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.2.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - SOILS TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Construction Workers Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 8 hours/day (1) CAx ET x EF x ED EF Exposure Frequency 125 days/year (1) AT x 24 hours/day ED Exposure Duration 1 years (1) AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 CA= (1/PEF + 1 /VF) x Cs AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014 PEF Particulate Emission Factor 1.40E+06 m3/kg USEPA, 2002a VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 14.31 g/m2-s per USEPA, 2002a center of source kg/m3 Notes: 1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME. Sources: USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.3.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Ingestion Construction Workers Adult Old Wilmington Road CGW CF Chemical Concentration in Groundwater Conversion Factor Max or 95% UCL 0.001 ug/L mg/ug USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = IR-GW Ingestion Rate of Groundwater 0.05 L/day (1) CGW x CFx IR-GW x EF x ED EF Exposure Frequency 30 days/year (1) BW x AT ED Exposure Duration 1 years (1) BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014b Dermal Construction Workers Adult Old Wilmington Road Daevent Cw Dermally Absorbed Dose per Event Chemical Concentration in Groundwater Calculated Max or 95% UCL mg/cm2-event ug/L USEPA, 2004 USEPA, 2014a Dermally Absorbed Dose (mg/kg/day) = FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EV x EF x ED x SA CF Conversion factor 0.001 L/cm3 BW x AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 X Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 4 hr/event (1) B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014b DAevent= 2 x FAx Kp x Cw x CF x sqrt[(6 xix tevent)/pi] EV Event Frequency 1 events/day (1) EF Exposure Frequency 30 days/year (1) For organics if tevent > t* ED Exposure Duration 1 years (1) DAevent =FA x Kp x Cw x CF x [tevent/(1 +B) + BW Body Weight 80 kg USEPA, 2014b 2n +(1 + 3B + 3B2)/(1 +B2) AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014b Notes 1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.4.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - GROUNDWATER TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Construction Workers Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 VDEQ, 2018 Exposure Concentration (mg/m3) = CW Chemical concentration in water. Max or 95% UCL ug/L USEPA, 2014a CF Conversion Factor 0.001 mg/ug - CA x ET x EF x ED ET Exposure Time 4 hours/day (1) AT x 24 hours/day EF Exposure Frequency 30 days/year (1) ED Exposure Duration 1 years (1) CA = CW x CF x VF AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 365 days USEPA, 2014b VF Volatilization Factor Calculated (mg/m3)/(mg/L) VDEQ, 2018 Notes: 1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. VDEQ, 2018: Virginia Unified Risk Assessment Model - VURAM 2.0 User's Guide. ------- TABLE 4.5.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - INDUSTRIAL WORKERS - SOIL OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Industrial Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 50 mg/day USEPA, 2011 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 1993 EF Exposure Frequency 219 days/year USEPA, 1993 ED Exposure Duration 7 years USEPA, 2011 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 Dermal Industrial Workers Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2004 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.02 mg/cm2/event USEPA, 2004 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 219 days/year USEPA, 1993 ED Exposure Duration 7 years USEPA, 2011 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. Superfund's Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Table 5-1, 16-103, and 16-105.. Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. Sources: USEPA, 1989: USEPA, 1993: USEPA, 2002: USEPA, 2004: USEPA, 2011: USEPA, 2014: ------- TABLE 4.6.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - INDUSTRIAL WORKERS - SOIL TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Industrial Workers Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 8 hours/day USEPA, 2014 CAx ET x EF x ED EF Exposure Frequency 219 days/year USEPA, 1993 AT x 24 hours/day ED Exposure Duration 7 years USEPA, 2011 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 CA= (1/PEF + 1 /VF) x Cs AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 PEF Particulate Emission Factor 3.24E+09 m3/kg USEPA, 1996, 2018 VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 87.36898 g/m2-s per USEPA, 2018 center of source kg/m3 Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 1996: Soil Screening Level Guidance: Technical Background Document. USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Tables 16-103 and 16-105. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA. ------- TABLE 4.7.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - INDUSTRIAL WORKERS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Ingestion Industrial Workers Adult Old Wilmington Road CGW CF Chemical Concentration in Groundwater Conversion Factor Max or 95% UCL 0.001 ug/L mg/ug USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = IR-GW Ingestion Rate of Groundwater 0.6 L/day (1) CGW x CF x IR-GW x EF x ED EF Exposure Frequency 219 days/year USEPA, 1993 BWx AT ED Exposure Duration 6.6 years (2) BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 2,409 days USEPA, 2014b Dermal Industrial Workers Adult Old Wilmington Road Daevent Cw Dermally Absorbed Dose per Event Chemical Concentration in Groundwater Calculated Max or 95% UCL mg/cm2-event ug/L USEPA, 2004 USEPA, 2014a Dermally Absorbed Dose (mg/kg/day) = FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EVx EF x ED x SA CF Conversion factor 0.001 L/cm3 BWx AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 X Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 0.25 hr/event (3) B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 3,527 cm2 USEPA, 2014b DAevent = 2 x FAx Kp x Cw x CF x sqrt[(6 xix tevent)/pi] EV Event Frequency 1 events/day (3) EF Exposure Frequency 219 days/year USEPA, 1993 For organics if tevent > t* ED Exposure Duration 6.6 years (2) DAevent = FAx Kp x Cw x CF x [tevent/(1+B) + BW Body Weight 80 kg USEPA, 2014b 2n x (1 + 3B+ 3B2)/(1 +B2)] AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 2,409 days USEPA, 2014b Notes 1 - USEPA, 2014: Frequently Asked Questions (FAQs) About Update of Standard Default Exposure Factors. 2-USEPA, 2011. Exposure Factors Handbook: 2011 Edition, Table 16-103. 3 - Professional judgment. USEPA, 1993: Superfund's Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.8.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Inhalation Industrial Workers Adult Old Wilmington Road S Volatile Chemical Generation Rate Derived mg/m3-min-shower Foster & Chrostowski 1987 Exposure Concentration (mg/m3)= K Mass Transfer Coefficient Derived min Foster&Chrostowski 1987 EF Exposure Frequency 219 days/year USEPA, 1993 Sx Kx EFx ED ED Exposure Duration 6.6 years USEPA, 2011 AT x Ra x CF Ra Air Exchange Rate 0.017 min"1 Foster&Chrostowski 1987 CF Conversion Factor 1,440 min/day - K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l Ds Shower Duration 10 min (1) Ra Dt Total Time in Bathroom 15 min (1) Fr Shower Water Flow Rate 10 L/min Foster&Chrostowski 1987 Sv Shower Room Air Volume 6 m3 Foster&Chrostowski 1987 ts Shower Dropler Drop Time 2 sec Foster&Chrostowski 1987 d Shower Droplet Diameter 1 mm Foster&Chrostowski 1987 T1 Calibration WaterTemperature 293 K Foster&Chrostowski 1987 Ts Shower Water Temperature 318 K Foster&Chrostowski 1987 ml Water Viscosity at T1 1.002 cp Foster&Chrostowski 1987 ms Water Viscosity at Ts 0.596 cp Foster&Chrostowski 1987 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Noncancer) 2,409 days USEPA, 2014 Notes: 1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME. Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower. ------- TABLE 4.9.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - SOILS OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Resident Child Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 100 mg/day USEPA, 2011 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 1993 EF Exposure Frequency 234 days/year USEPA, 1993 ED1 Exposure Duration (Age 0-2) 1 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 2-6) 1 years (1), USEPA, 2005, 2011 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 730 days USEPA, 2014 Dermal Resident Child Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1E-06 kg/mg - SA Skin Surface Available for Contact 2,373 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.04 mg/cm2/event USEPA, 2004 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 234 days/year USEPA, 1993 ED1 Exposure Duration (Age 0-2) 1 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 2-6) 1 years (1), USEPA, 2005, 2011 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 730 days USEPA, 2014 Notes: 1 - Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0-2 years and 2-6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060. USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Tables 5-1 and 16-108. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.10.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - SOILS TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Resident Child Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 24 hours/day USEPA, 2014 CA x ET x EF x ED EF Exposure Frequency 234 days/year USEPA, 1993 AT x 24 hours/day ED1 Exposure Duration (Age 0 - 2) 1 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 2 - 6) 1 years (1), USEPA, 2005, 2011 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 CA = (1 /PEF + 1 /VF) x Cs AT-N Averaging Time (Non-Cancer) 730 days USEPA, 2014 PEF Particulate Emission Factor 3.24E+09 m3/kg USEPA, 1996, 2018 VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 87.36898 g/m2-s per USEPA, 1996, 2018 center of source kg/m3 Notes: 1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 1996: Soil Screening Level Guidance: Technical Background Document. USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Table 16-108. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA. ------- TABLE 4.11.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Ingestion Residents Child Old Wilmington Road CGW CF Chemical Concentration in Groundwater Conversion Factor Max or 95% UCL 0.001 ug/L mg/ug USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = IR-GW Ingestion Rate of Groundwater 0.45 L/day USEPA, 2011 CGW x CF x IR-GW x EF x ED EF Exposure Frequency 234 days/year USEPA, 1993 BWx AT ED1 Exposure Duration (Age 0 - 2) 2 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 2 - 6) 1 years (1), USEPA, 2005, 2011 BW Body Weight 15 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 1,095 days USEPA, 2014b Dermal Residents Child Old Wilmington Road Daevent Cw Dermally Absorbed Dose per Event Chemical Concentration in Groundwater Calculated Max or 95% UCL mg/cm2-event ug/L USEPA, 2004 USEPA, 2014a Dermally Absorbed Dose (mg/kg/day) = FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EVx EF x ED x SA CF Conversion factor 0.001 L/cm3 BWx AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 X Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 0.33 hr/event USEPA, 2004 B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 6,365 cm2 USEPA, 2014b DAevent = 2 x FAx Kp x Cw x CF x sqrt[(6 xix tevent)/pi] EV Event Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 234 days/year USEPA, 1993 For organics if tevent > t* ED1 Exposure Duration (Age 0 - 2) 2 years (1), USEPA, 2005, 2011 DAevent = FAx Kp x Cw x CF x [tevent/(1+B) + ED2 Exposure Duration (Age 2 - 6) 1 years (1), USEPA, 2005, 2011 2x n(1 + 3B+ 3B2)/(1 +B2)] BW Body Weight 15 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 1,095 days USEPA, 2014b Notes: 1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. Tables 3-15 and 3-33. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.12.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - SEDIMENT OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Sediment Exposure Medium: Sediment Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Resident Child Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 100 mg/day USEPA, 1993 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg (1) BWx AT Fl Fraction Ingested 1 unitless (1) EF Exposure Frequency 26 days/year (1) ED1 Exposure Duration (Age 0-2) 1 years (2), USEPA, 1993, 2005 ED2 Exposure Duration (Age 2-6) 1 years (2), USEPA, 1993, 2005 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 730 days USEPA, 2014 Dermal Resident Child Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 2,373 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.04 mg/cm2/event USEPA, 2004 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 26 days/year (1) ED1 Exposure Duration (Age 0-2) 1 years (2), USEPA, 1993, 2005 ED2 Exposure Duration (Age 2-6) 1 years (2), USEPA, 1993, 2005 BW Body Weight 15 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 730 days USEPA, 2014 Notes: 1 - Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE. 2 - Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, children residents will be evaluated as two age groups, 0-2 years and 2-6 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060. USEPA, 1993: Superfund's Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.13.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - SOILS OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil sure Medium: Surface/Subsurface Soil Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Resident Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 50 mg/day USEPA, 2011 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless USEPA, 1993 EF Exposure Frequency 234 days/year USEPA, 1993 ED1 Exposure Duration (Age 6 - 16) 2 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 16 - 26) 5 years (1), USEPA, 2005, 2011 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 Dermal Resident Adult Old Wilmington Road CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 6,032 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.01 mg/cm2/event USEPA, 2004 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 234 days/year USEPA, 1993 ED1 Exposure Duration (Age 6 - 16) 2 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 16 - 26) 5 years (1), USEPA, 2005, 2011 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Tables 5-1 and 16-108. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.14.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - SOILS TO AIR OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Surface Soil/Subsurface Soil Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Resident Adult Old Wilmington Road CA Chemical concentration in air Calculated mg/m3 USEPA, 2002a Exposure Concentration (mg/m3) = CS Chemical concentration in soil Max or 95% UCL mg/kg USEPA, 2002b ET Exposure Time 24 hours/day USEPA, 2014 CA x ET x EF x ED EF Exposure Frequency 234 days/year USEPA, 1993 AT x 24 hours/day ED1 Exposure Duration (Age 6 -16) 2 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 16 - 26) 5 years (1), USEPA, 2005, 2011 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 CA = (1 /PEF + 1 /VF) x Cs AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 PEF Particulate Emission Factor 3.24E+09 m3/kg USEPA, 1996, 2018 VF Volatilization Factor Chemical-specific m3/kg USEPA, 2002a Q/C Inverse of mean concentration at 87.36898 g/m2-s per USEPA, 1996, 2018 center of source kg/m3 Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 1996: Soil Screening Level Guidance: Technical Background Document. USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10. USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Table 16-108. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA. ------- TABLE 4.15.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Groundwater Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Ingestion Residents Adult Old Wilmington Road CGW CF Chemical Concentration in Groundwater Conversion Factor 95% UCL or Max 0.001 ug/L mg/ug USEPA, 2014a Chronic Daily Intake (CDI) (mg/kg/day) = IR-GW Ingestion Rate of Groundwater 1.2 L/day USEPA, 2011 CGW x CF x IR-GW x EF x ED EF Exposure Frequency 234 days/year USEPA, 1993 BWx AT ED1 Exposure Duration (Age 6-16) 2 years (1), USEPA, 2005, 2011 ED2 Exposure Duration (Age 16-26) 7 years (1), USEPA, 2005, 2011 BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 3,285 days USEPA, 2014b Dermal Residents Adult Old Wilmington Road Daevent Cw Dermally Absorbed Dose per Event Chemical Concentration in Groundwater Calculated Max or 95% UCL mg/cm2-event ug/L USEPA, 2004 USEPA, 2014a Dermally Absorbed Dose (mg/kg/day) = FA Fraction Absorbed Chemical Specific unitless USEPA, 2004 DAevent x EV x EF x ED x SA CF Conversion factor 0.001 L/cm3 BWx AT Kp Permeability coefficient Chemical Specific cm/hr USEPA, 2004 X Lag time Chemical Specific hr/event USEPA, 2004 For inorganics t* Time it takes to reach steady state Chemical Specific hr/event USEPA, 2004 DAevent = Kp x CW x CF x tevent tevent Duration of event 0.25 hr/event USEPA, 2004 B Bunge model constant Chemical Specific unitless USEPA, 2004 For organics if tevent <= t* SA Skin Surface Available for Contact 19,652 cm2 USEPA, 2014b DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi] EV Event Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 234 days/year USEPA, 1993 For organics if tevent > t* ED1 Exposure Duration (Age 6-16) 2 years (1), USEPA, 2005, 2011 DAevent = FA x Kp x Cw x CF x [tevent/(1 + B) + ED2 Exposure Duration (Age 16-26) 7 years (1), USEPA, 2005, 2011 2xtx(1 + 3B + 3B2)/(1 + B2)] BW Body Weight 80 kg USEPA, 2014b AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014b AT-N Averaging Time (Non-Cancer) 3,285 days USEPA, 2014b Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2011: Exposure Factors Handbook: 2011 Edition, Table 3-33. USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42 USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- TABLE 4.16.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER OLD WILMINGTON ROAD SITE Scenario Timeframe: Future Medium: Groundwater Exposure Medium: Air Exposure Route Receptor Population Receptor Age Exposure Point Parameter Code Parameter Definition Value Units Rationale/ Reference Intake Equation/ Model Name Inhalation Residents Adult Old Wilmington Road S Volatile Chemical Generation Rate Derived mg/m3-min-shower Foster & Chrostowski 1987 Exposure Concentration (mg/m3)= K Mass Transfer Coefficient Derived min Foster&Chrostowski 1987 EF Exposure Frequency 234 showers/year USEPA, 1993 Sx Kx EFx ED ED1 Exposure Duration (Age 6-16) 2 years (1), USEPA, 2005, 2011 AT x Ra x CF ED2 Exposure Duration (Age 16-26) 7 years (1), USEPA, 2005, 2011 Ra Air Exchange Rate 0.017 min"1 Foster&Chrostowski 1987 K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l CF Conversion Factor 1,440 min/day - Ra Ds Shower Duration 10 min USEPA, 2004 Dt Total Time in Bathroom 15 min (2) Fr Shower Water Flow Rate 10 L/min Foster&Chrostowski 1987 Sv Shower Room Air Volume 6 m3 Foster&Chrostowski 1987 ts Shower Dropler Drop Time 2 sec Foster&Chrostowski 1987 d Shower Droplet Diameter 1 mm Foster&Chrostowski 1987 T1 Calibration WaterTemperature 293 K Foster&Chrostowski 1987 Ts Shower Water Temperature 318 K Foster&Chrostowski 1987 ml Water Viscosity at T1 1.002 cp Foster&Chrostowski 1987 ms Water Viscosity at Ts 0.596 cp Foster&Chrostowski 1987 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Noncancer) 3,285 days USEPA, 2014 Notes: 1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16 - 26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). 2 - Professional judgment. Sources: USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2011: Exposure Factors Handbook: 2011 Edition, Table 3-33. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower. ------- TABLE 4.17.CTE VALUES USED FOR DAILY INTAKE CALCULATIONS CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - SEDIMENT OLD WILMINGTON ROAD SITE Scenario Timeframe: Current/Future Medium: Sediment Exposure Medium: Sediment Exposure Route Receptor Population Receptor Age Exposure Point Parameter Parameter Definition Value Units Rationale/ Intake Equation/ Code Reference Model Name Ingestion Residents Adult Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Intake (mg/kg/day) = IR-S Ingestion Rate 50 mg/day USEPA, 1993 RBA Relative Bioavailability Chemical Specific unitless USEPA, 1989 Cs x RBA x IRS x CF3 x Fl x EF x ED CF3 Conversion Factor 3 1.0E-06 kg/mg - BWx AT Fl Fraction Ingested 1 unitless (1) EF Exposure Frequency 26 days/year (1) ED1 Exposure Duration (Age 6 - 16) 2 years (2), USEPA, 1993, 2005 ED2 Exposure Duration (Age 16 - 26) 5 years (2), USEPA, 1993, 2005 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 Dermal Residents Adult Old Wilmington Road CS Chemical concentration in sediment Max or 95% UCL mg/kg USEPA, 2002 Dermally Absorbed Dose (mg/kg/day) = CF3 Conversion Factor 3 1.0E-06 kg/mg - SA Skin Surface Available for Contact 6,032 cm2 USEPA, 2014 CS x CF3 x SA x SSAF x DABS x EV x EF x ED SSAF Soil to Skin Adherence Factor 0.01 mg/cm2/event USEPA, 2004 BWx AT DABS Absorption Factor Chemical Specific unitless USEPA, 2004 EV Events Frequency 1 events/day USEPA, 2004 EF Exposure Frequency 26 days/year (1) ED1 Exposure Duration (Age 6 - 16) 2 years (2), USEPA, 1993, 2005 ED2 Exposure Duration (Age 16 - 26) 5 years (2), USEPA, 1993, 2005 BW Body Weight 80 kg USEPA, 2014 AT-C Averaging Time (Cancer) 25,550 days USEPA, 2014 AT-N Averaging Time (Non-Cancer) 2,555 days USEPA, 2014 Notes: 1 - Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE. 2 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005). Sources: USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060. USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure. USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December. USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120. ------- RAGS Part D Table 5 Non-Cancer Toxicity Data ------- LIST OF TABLES RAGS PART D TABLE 5 NON-CANCER TOXICITY DATA Table No. 5.1 Non-Cancer Toxicity Data - Oral/Dermal 5.2 Non-Cancer Toxicity Data - Inhalation ------- TABLE 5.1 NON-CANCER TOXICITY DATA - ORAL/DERMAL HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 1 OF 2 Chemical of Potential Concern Chronic/ Subchronic Oral RfD Oral Absorption Efficiency for Dermal'1' Absorbed RfD for Dermal'2' Primary Target Organ(s) Combined Uncertainty/Modifying Factors RfD:Target Organ(s) Value Units Value Units Source(s) Date(s)'3' (MM/DD/YYYY) Volatile Organic Compounds 1,2,4-Trimethylbenzene Subchronic 4.0E-02 mg/kg/day 1 4.0E-02 mg/kg/day Nervous 100 IRIS 5/11/2018 Chronic 1.0E-02 mg/kg/day 1 1.0E-02 mg/kg/day Nervous 300 IRIS 5/11/2018 2-Butanone Subchronic 2.0E+00 mg/kg/day 1 2.0E+00 mg/kg/day Developmental 1000 HEAST 5/11/2018 Chronic 6.0E-01 mg/kg/day 1 6.0E-01 mg/kg/day Developmental 1000 IRIS 5/11/2018 2-Hexanone Chronic 5.0E-03 mg/kg/day 1 5.0E-03 mg/kg/day Nervous 1000 IRIS 5/11/2018 Chloroform Subchronic 1.0E-01 mg/kg/day 1 1.0E-01 mg/kg/day Hepatic 100 ATSDR 9/1997 Chronic 1.0E-02 mg/kg/day 1 1.0E-02 mg/kg/day Hepatic 100 IRIS 5/11/2018 cis-1,2-Dichloroethene Subchronic 2.0E-02 mg/kg/day 1 2.0E-02 mg/kg/day Urinary 300 PPRTV 5/11/2018 Chronic 2.0E-03 mg/kg/day 1 2.0E-03 mg/kg/day Urinary 3000 IRIS 5/11/2018 Methyl Tert-Butyl Ether NA NA NA NA NA NA NA NA NA NA Tetrachloroethene Subchronic 1.0E-01 mg/kg/day 1 1.0E-01 mg/kg/day Hepatic 100 HEAST 5/11/2018 Chronic 6.0E-03 mg/kg/day 1 6.0E-03 mg/kg/day Nervous, Ocular 1000 IRIS 5/11/2018 Trichloroethene Chronic 5.0E-04 mg/kg/day 1 5.0E-04 mg/kg/day Developmental, Immune 10- 1000 IRIS 5/11/2018 Vinyl Chloride Chronic 3.0E-03 mg/kg/day 1 3.0E-03 mg/kg/day Hepatic 30 IRIS 5/11/2018 Semivolatile Organic Compounds 1,4-Dioxane Subchronic 5.0E-01 mg/kg/day 1 5.0E-01 mg/kg/day Hepatic 100 ATSDR 4/2012 Chronic 3.0E-02 mg/kg/day 1 3.0E-02 mg/kg/day Hepatic, Urinary 300 IRIS 5/11/2018 Benzo(a)pyrene Chronic 3.0E-04 mg/kg/day 1 3.0E-04 mg/kg/day Developmental, Reproductive, Immune 300- 1000 IRIS 5/11/2018 Bis(2-ethylhexyl)phthalate Subchronic 1.0E-01 mg/kg/day 1 1.0E-01 mg/kg/day Reproductive 100 ATSDR 9/2002 Chronic 2.0E-02 mg/kg/day 1 2.0E-02 mg/kg/day Hepatic 1000 IRIS 5/11/2018 Caprolactam Subchronic 5.0E-01 mg/kg/day 1 5.0E-01 mg/kg/day Urinary 100 HEAST 5/11/2018 Chronic 5.0E-01 mg/kg/day 1 5.0E-01 mg/kg/day Developmental 100 IRIS 5/11/2018 Naphthalene Subchronic 6.0E-01 mg/kg/day 1 6.0E-01 mg/kg/day Nervous 90 ATSDR 8/2005 Chronic 2.0E-02 mg/kg/day 1 2.0E-02 mg/kg/day Body Weight 3000 IRIS 5/11/2018 Pesticides/PCBs Dieldrin Subchronic 1.0E-04 mg/kg/day 1 1.0E-04 mg/kg/day Nervous System 100 ATSDR 9/2002 Chronic 5.0E-05 mg/kg/day 1 5.0E-05 mg/kg/day Hepatic 100 IRIS 5/11/2018 Inorganics Aluminum Subchronic 1.0E+00 mg/kg/day 1 1.0E+00 mg/kg/day Nervous System 30 ATSDR 9/2008 Chronic 1.0E+00 mg/kg/day 1 1.0E+00 mg/kg/day Nervous System 100 PPRTV 10/23/2006 Antimony Subchronic 4.0E-04 mg/kg/day 0.15 6.0E-05 mg/kg/day Whole Body 1000 PPRTV 7/29/2008 Chronic 4.0E-04 mg/kg/day 0.15 6.0E-05 mg/kg/day Hematologic 1000 IRIS 5/11/2018 Arsenic Chronic 3.0E-04 mg/kg/day 1 3.0E-04 mg/kg/day Cardiovascular System, Dermal 3 IRIS 5/11/2018 Barium Subchronic 2.0E-01 mg/kg/day 0.07 1.4E-02 mg/kg/day Urinary 300 ATSDR 8/2007 Chronic 2.0E-01 mg/kg/day 0.07 1.4E-02 mg/kg/day Urinary 300 IRIS 5/11/2018 Beryllium Subchronic 5.0E-03 mg/kg/day 0.007 3.5E-05 mg/kg/day None Reported 100 HEAST 5/11/2018 Chronic 2.0E-03 mg/kg/day 0.007 1.4E-05 mg/kg/day Gastrointestinal 300 IRIS 5/11/2018 Cadmium (soil) Chronic 1.0E-03 mg/kg/day 0.025 2.5E-05 mg/kg/day Urinary 10 IRIS 5/11/2018 Cadmium (water) Chronic 5.0E-04 3.0E-03 mg/kg/day 0.05 2.5E-05 mg/kg/day Urinary 10 300 IRIS 5/11/2018 Cobalt Subchronic mg/kg/day 1 3.0E-03 mg/kg/day Thyroid PPRTV 8/25/2008 Chronic 3.0E-04 mg/kg/day 1 3.0E-04 mg/kg/day Thyroid 3000 PPRTV 8/25/2008 Copper Chronic 4.0E-02 mg/kg/day 1 4.0E-02 mg/kg/day Gastrointestinal System NA HEAST 5/11/2018 Iron Subchronic 7.0E-01 mg/kg/day 1 7.0E-01 mg/kg/day Gastrointestinal System 1.5 PPRTV 9/11/2006 Chronic 7.0E-01 mg/kg/day 1 7.0E-01 mg/kg/day Gastrointestinal System 1.5 PPRTV 9/11/2006 ------- TABLE 5.1 NON-CANCER TOXICITY DATA - ORAL/DERMAL HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 2 OF 2 Chemical of Potential Concern Chronic/ Subchronic Oral RfD Oral Absorption Efficiency for Dermal'1' Absorbed RfD for Dermal'2' Primary Target Organ(s) Combined Uncertainty/Modifying Factors RfD:Target Organ(s) Value Units Value Units Source(s) Date(s)'3' (MM/DD/YYYY) Lead NA NA NA NA NA NA NA NA NA NA Manganese141 Chronic 2.4E-02 mg/kg/day 0.04 9.6E-04 mg/kg/day Nervous System 3 IRIS 5/11/2018 Mercury151 Subchronic 2.0E-03 mg/kg/day 0.07 1.4E-04 mg/kg/day Urinary 100 ATSDR 3/1999 Chronic 3.0E-04 mg/kg/day 0.07 2.1E-05 mg/kg/day Immune, Urinary 1000 IRIS 5/11/2018 Nickel Subchronic 2.0E-02 mg/kg/day 0.04 8.0E-04 mg/kg/day Body Weight 300 HEAST 5/11/2018 Chronic 2.0E-02 mg/kg/day 0.04 8.0E-04 mg/kg/day Body Weight 300 IRIS 5/11/2018 Selenium Subchronic 5.0E-03 mg/kg/day 1 5.0E-03 mg/kg/day Body Weight 3 HEAST 5/11/2018 Chronic 5.0E-03 mg/kg/day 1 5.0E-03 mg/kg/day Nervous, Hematologic, Dermal 3 IRIS 5/11/2018 Thallium Subchronic 4.0E-05 mg/kg/day 1 4.0E-05 mg/kg/day Dermal 1000 PPRTV-X 9/17/2012 Chronic 1.0E-05 mg/kg/day 1 1.0E-05 mg/kg/day Dermal 3000 PPRTV-X 9/17/2012 Vanadium161 Subchronic 1.0E-02 mg/kg/day 0.026 2.6E-04 mg/kg/day Urinary 10 ATSDR 9/2012 Chronic 5.0E-03 mg/kg/day 0.026 1.3E-04 mg/kg/day Dermal 300 IRIS 5/11/2018 Zinc Subchronic 3.0E-01 mg/kg/day 1 3.0E-01 mg/kg/day Hematologic 3 ATSDR 8/2005 Chronic 3.0E-01 mg/kg/day 1 3.0E-01 mg/kg/day Immune, Hematologic 3 IRIS 5/11/2018 Footnotes: 1 - U.S. EPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. 2 - Adjusted dermal RfD = Oral RfD x Oral Absorption Efficiency for Dermal. 3 - Dates for IRIS and HEAST are the date the databases were searched. The dates for ATSDR, PPRTV, and Cal EPA are the dates of the reference documents containing the toxicity values. 4 - Adjusted IRIS value in accordance with IRIS. 5 - No value is available for elemental mercury, value presented is for mercuric chloride. 6 - Chronic value from IRIS adjusted as specified in the USEPA Regional Screening Level User Guide (November 2017). Definitions: ATSDR = Agency for Toxic Substances and Disease Registry. HEAST = Health Effects Assessment Summary Tables IRIS = Integrated Risk Information System NA = Not Available. PPRTV = Provisional Peer Reviewed Toxicity Value. PPRTV-X = Appendix Provisional Peer Reviewed Toxicity Value. ------- TABLE 5.2 NON-CANCER TOXICITY DATA - INHALATION HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 1 OF 2 Chemical of Potential Concern Chronic/ Subchronic Inhalation RfC Primary Target Organ(s) Combined Uncertainty/Modifying Factors RfC : Target Organ(s) Value Units Source(s) Date(s)11' (MM/DD/YYYY) Volatile Organic Compounds 1,2,4-T rimethylbenzene Subchronic 2.0E-01 mg/m3 Nervous 100 IRIS 5/11/2018 Chronic 6.0E-02 mg/m3 Nervous 300 IRIS 5/11/2018 2-Butanone Chronic 5.0E+00 mg/m3 Developmental, Musculoskeletal 300 IRIS 5/11/2018 2-Hexanone Chronic 3.0E-02 mg/m3 Nervous 3000 IRIS 5/11/2018 Chloroform Subchronic 2.4E-01 mg/m3 Hepatic 300 ATSDR 9/1997 Chronic 9.8E-02 mg/m3 Hepatic 100 ATSDR 9/1997 cis-1,2-Dichloroethene NA NA NA NA NA NA NA Methyl Tert-Butyl Ether Chronic 3.0E+00 mg/m3 Hepatic, Urinary, Ocular 100 IRIS 5/11/2018 Tetrachloroethene Chronic 4.0E-02 mg/m3 Nervous System, Ocular 1000 IRIS 5/11/2018 Trichloroethene Chronic 2.0E-03 mg/m3 Developmental, Immune 10-100 IRIS 5/11/2018 Vinyl Chloride Chronic 1.0E-01 mg/m3 Hepatic 30 IRIS 5/11/2018 Semivolatile Organic Compounds 1,4-Dioxane Subchronic 7.2E-01 mg/m3 Respiratory System 30 ATSDR 4/2012 Chronic 3.0E-02 mg/m3 Nervous System, Respiratory 1000 IRIS 5/11/2018 Benzo(a)pyrene Chronic 2.0E-06 mg/m3 Developmental, Reproductive 3000 IRIS 5/11/2018 Bis(2-ethylhexyl)phthalate NA NA NA NA NA NA NA Caprolactam Chronic 2.2E-03 mg/m3 Respiratory System NA Cal EPA 10/2013 Naphthalene Chronic 3.0E-03 mg/m3 Nervous System, Respiratory 3000 IRIS 5/11/2018 Pesticides/PCBs Dieldrin NA NA NA NA NA NA NA Inorganics Aluminum Chronic 5.0E-03 mg/m3 Nervous System 300 PPRTV 10/23/2006 Antimony NA NA NA NA NA NA NA Arsenic Chronic 1.5E-Q5 mg/m3 NA NA Cal EPA 12/2008 Barium Subchronic 5.0E-03 mg/m3 Developmental 100 HE AST 5/11/2018 Chronic 5.0E-04 mg/m3 Developmental 1000 HE AST 5/11/2018 Beryllium Chronic 2.0E-05 mg/m3 Immune, Respiratory 10 IRIS 5/11/2018 Cadmium Chronic 1.0E-05 mg/m3 Urinary 9 ATSDR 9/2012 Cobalt Subchronic 2.0E-05 mg/m3 Respiratory System 100 PPRTV 8/25/2008 Chronic 6.0E-06 mg/m Respiratory System 300 PPRTV 8/25/2008 ------- TABLE 5.2 NON-CANCER TOXICITY DATA - INHALATION HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 2 OF 2 Chemical of Potential Concern Chronic/ Subchronic Inhalation RfC Primary Target Organ(s) Combined Uncertainty/Modifying Factors RfC : Target Organ(s) Value Units Source(s) Date(s)11' (MM/DD/YYYY) Copper NA NA NA NA NA NA NA Iron NA NA NA NA NA NA NA Lead NA NA NA NA NA NA NA Manganese Chronic 5.0E-05 mg/m Nervous System 1000 IRIS 5/11/2018 Mercury Subchronic 3.0E-04 mg/m3 Nervous System 30 HEAST 5/11/2018 Chronic 3.0E-04 mg/m3 Nervous System 30 IRIS 5/11/2018 Nickel Subchronic 2.0E-04 mg/m3 Respiratory System 30 ATSDR 8/2005 Chronic 9.0E-05 mg/m3 Respiratory System 30 ATSDR 8/2005 Selenium Chronic 2.0E-02 mg/m3 Respiratory System NA Cal EPA 12/2008 Thallium NA NA NA NA NA NA NA Vanadium Chronic 1 .OE-04 mg/m3 Respiratory 30 ATSDR 9/2012 Zinc NA NA NA NA NA NA NA Footnotes: 1 - Dates for IRIS and HEAST are the date the databases were searched. The dates for ATSDR, PPRTV, and Cal EPA are the dates of the reference documents containing the toxicity values. Definitions: ATSDR = Agency for Toxic Substances and Disease Registry. Cal EPA, 2008 = Technical Support Document for Noncancer RELs. Cal EPA, 2013 = Reference Exposure Levels for Caprolactam. HEAST = Health Effects Assessment Summary Table IRIS = Integrated Risk Information System NA = Not Applicable PPRTV = Provisional Peer Reviewed Toxicity Value. ------- RAGS Part D Table 6 Cancer Toxicity Data ------- LIST OF TABLES RAGS PART D TABLE 6 CANCER TOXICITY DATA Table No. 6 1 Cancer Toxicity Data - Oral/Dermal 6 2 Cancer Toxicity Data - Inhalation ------- TABLE 6.1 CANCER TOXICITY DATA - ORAL/DERMAL HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 1 OF 2 Chemical Oral Cancer Slope Factor Oral Absorption Absorbed Cancer Slope Factor Weight of Evidence/ Oral CSF of Potential Efficiency for Dermal*2* Cancer Guideline Concern Value Units for Dermal*1* Value Units Description*3* Source(s) Date(s)(4) (MSWDD/YYYY) Volatile Organic Compounds 1,2,4-T rimethy Ibenzene NA NA NA NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 2-Butanone NA NA NA NA NA Data are inadequate for an assessment of human carcinogenic potential IRIS 5/11/2018 2-Hexanone NA NA NA NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Chloroform 3.1E-02 (mg/kg/day)"1 1 3.1E-02 (mg/kg/day)"1 Likely to be carcinogenic to humans Cal EPA 6/2009 cis-1,2-Dichloroethene NA NA NA NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Methyl Tert-Butyl Ether 1.8E-03 (mg/kg/day)"1 1 1.8E-03 (mg/kg/day)"1 NA Cal EPA 6/2009 Tetrachloroethene 2.1E-03 (mg/kg/day)"1 1 2.1E-03 (mg/kg/day)"1 Likely to be carcinogenic to humans IRIS 5/11/2018 Trichloroethene (Mutagenic)'5' 9.3E-03 (mg/kg/day)-1 1 9.3E-03 (mg/kg/day)"1 Carcinogenic to humans IRIS 5/11/2018 Trichloroethene (Nonmutagenic) 3.7E-02 (mg/kg/day)"1 1 3.7E-02 (mg/kg/day)"1 Carcinogenic to humans IRIS 5/11/2018 Vinyl Chloride 7.2E-01 (mg/kg/day)"1 1 7.2E-01 (mg/kg/day)"1 Known/likely human carcinogen IRIS 5/11/2018 Semivolatile Organic Compounds 1,4-Dioxane 1.0E-01 (mg/kg/day)"1 1 1.0E-01 (mg/kg/day)"1 Likely to be carcinogenic to humans IRIS 5/11/2018 Benzo(a)pyrene(5) 1.0E+00 (mg/kg/day)"1 1 1.0E+00 (mg/kg/day)"1 Carcinogenic to humans IRIS 5/11/2018 Bis(2-ethylhexyl)phthalate 1.4E-02 (mg/kg/day)"1 1 1.4E-02 (mg/kg/day)"1 B2 (Probable human carcinogen) IRIS 5/11/2018 Caprolactam NA NA NA NA NA NA NA NA Naphthalene NA NA NA NA NA Carcinogenic potential cannot be determined IRIS 5/11/2018 Pesticides/PCBs Dieldrin 1.6E+01 (mg/kg/day)"1 1 1.6E+01 (mg/kg/day)"1 B2 (Probable human carcinogen) IRIS 5/11/2018 Inorganics Aluminum NA NA NA NA NA NA NA NA Antimony NA NA NA NA NA NA NA NA Arsenic 1.5E+00 (mg/kg/day)"1 1 1.5E+00 (mg/kg/day)"1 A (human carcinogen) IRIS 5/11/2018 Barium NA NA NA NA NA Not likely to be carcinogenic to humans IRIS 5/11/2018 Beryllium NA NA NA NA NA Carcinogenic potential cannot be determined IRIS 5/11/2018 Cadmium NA NA NA NA NA B1 (Probable human carcinogen) IRIS 5/11/2018 Cobalt NA NA NA NA NA NA NA NA Copper NA NA NA NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Iron NA NA NA NA NA NA NA NA Lead NA NA NA NA NA B2 (Probable human carcinogen) IRIS 5/11/2018 ------- TABLE 6.1 CANCER TOXICITY DATA - ORAL/DERMAL HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 2 OF 2 Chemical of Potential Concern Oral Cancer Slope Factor Oral Absorption Efficiency for Dermal*1* Absorbed Cancer Slope Factor for Dermal*2* Weight of Evidence/ Cancer Guideline Description*3* Oral CSF Value Units Value Units Source(s) Date(s)<4) (MSWDD/YYYY) Manganese NA NA NA NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Mercury NA NA NA NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Nickel NA NA NA NA NA NA NA NA Selenium NA NA NA NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Thallium NA NA NA NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Vanadium NA NA NA NA NA NA NA NA Zinc NA NA NA NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Footnotes: 1 - USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005. 2 - Weight of evidence description is the most recent one presented in IRIS. 3 - Adjusted cancer slope factor for dermal = Oral cancer slope factor / Oral absorption efficiency for dermal. 4 - Dates for IRIS are the date the databases was searched. The dates for Cal EPA are the dates of the reference documents containing the toxicity values. 5 - Trichloroethene, benzo(a)pyrene, and hexavalent chromium are considered to act via the mutagenic mode of action. These chemicals are evaluated in accordance with USEPA's for Assessing Susceptibility from Early-Life Exposure to Carcinogens (March 2005). Definitions: Cal EPA = California Environmental Protection Agency. IRIS = Integrated Risk Information System. NA = Not Available. ------- TABLE 6.2 CANCER TOXICITY DATA - INHALATION HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 1 OF 2 Chemical Unit Risk Weight of Evidence/ Unit Risk : Inhalation CSF of Potential Cancer Guideline Concern Value Units Description11' Source(s) Date(s)'2' (MM/DD/YYYY) Volatile Organic Compounds 1,2,4-T rimethylbenzene NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 2-Butanone NA NA Data are inadequate for an assessment of human carcinogenic potential IRIS 5/11/2018 2-Hexanone NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Chloroform 2.3E-05 (ug/m3)"1 Likely to be carcinogenic to humans IRIS 5/11/2018 cis-1,2-Dichloroethene NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Methyl Tert-Butyl Ether 2.6E-07 (ug/m3)"1 NA Cal EPA 6/2009 Tetrachloroethene 2.6E-07 (ug/m3)"1 Likely to be carcinogenic to humans IRIS 5/11/2018 Trichloroethene (Mutagenic)'3' 1.0E-06 (ug/m3)"1 Carcinogenic to humans IRIS 5/11/2018 Trichloroethene (Nonmutagenic) 3.1E-06 (ug/m3)"1 Carcinogenic to humans IRIS 5/11/2018 Vinyl Chloride 4.4E-06 (ug/m3)"1 Known/likely human carcinogen IRIS 5/11/2018 Semivolatile Organic Compounds 1,4-Dioxane 5.0E-06 (ug/m3)"1 Likely to be carcinogenic to humans IRIS 5/11/2018 Benzo(a)pyrene(3) 6.0E-04 (ug/m3)"1 Carcinogenic to humans IRIS 5/11/2018 Bis(2-ethylhexyl)phthalate 2.4E-06 (ug/m3)"1 B2 (Probable human carcinogen) Cal EPA 6/2009 Caprolactam NA NA NA NA NA Naphthalene 3.4E-05 (ug/m3)"1 Carcinogenic potential cannot be determined Cal EPA 6/2009 Pesticides/PCBs Dieldrin 4.6E-03 (ug/m3)"1 B2 (Probable human carcinogen) IRIS 5/11/2018 Inorganics Aluminum NA NA NA NA NA Antimony NA NA NA NA NA Arsenic 4.3E-03 (ug/m3)"1 A (Known human carcinogen) IRIS 5/11/2018 Barium NA NA Carcinogenic potential cannot be determined IRIS 5/11/2018 ------- TABLE 6.2 CANCER TOXICITY DATA - INHALATION HUMAN HEALTH RISK ASSESSMENT REPORT OLD WILMINGTON ROAD SITE WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA PAGE 2 OF 2 Chemical of Potential Concern Unit Risk Weight of Evidence/ Cancer Guideline Description11' Unit Risk : Inhalation CSF Value Units Source(s) Date(s)12' (MM/DD/YYYY) Beryllium 2.4E-03 (ug/m3)"1 Known/likely human carcinogen IRIS 5/11/2018 Cadmium 1.8E-03 (ug/m3)"1 B1 (Probable human carcinogen) IRIS 5/11/2018 Cobalt 9.0E-03 (ug/m3)"1 NA PPRTV 8/25/2008 Copper NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Iron NA NA NA NA NA Lead NA NA B2 (Probable human carcinogen) IRIS 5/11/2018 Manganese NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Mercury NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Nickel 2.6E-04 (ug/m3)"1 NA Cal EPA 6/2009 Selenium NA NA D (Not classifiable as to human carcinogenicity) IRIS 5/11/2018 Thallium NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Vanadium NA NA NA NA NA Zinc NA NA Inadequate information to assess carcinogenic potential IRIS 5/11/2018 Footnotes: 1 - Weight of evidence description is the most recent one presented in IRIS. 2 - Dates for IRIS and PPRTV are the dates the databases were searched. The dates for Cal EPA is the date of the reference document containing the toxicity values 3 - Trichloroethene, benzo(a)pyrene, and hexavalent chromium are considered to act via the mutagenic mode of action. These chemicals are evaluated in accordanc Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (March 2005). Definitions: Cal EPA = California Environmental Protection Agency, Technical Support Document for Cancer Potency Factors, 2009. IRIS = Integrated Risk Information System. NA = Not Available. PPRTV = Provisional Peer Reviewed Toxicity Value. ------- RAGS Part D Table 7 Calculation of Cancer Risks and Non-Cancer Hazards ------- LIST OF TABLES RAGS PART D TABLE 7 CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS Table No. Reasonable Maximum Exposuri 7.1 .RME Current Industrial Workers 7.2.RME Current Child Residents 7.3.RME Current Adult Residents 7.4.RME Current Lifelong Residents 7.5.RME Future Construction Workers 7.6.RME Future Industrial Workers 7.7.RME Future Child Residents 7.8.RME Future Adult Residents 7.9.RME Future Lifelong Residents Central Tendency Exposures 7 1 o —I m Current Industrial Workers 7 2 o —i m Current Child Residents 7 3 o —i m Current Adult Residents 7 4 o —i m Current Lifelong Residents 7 5 o —i m Future Construction Workers 7 6 o —i m Future Industrial Workers 7 7 o —i m Future Child Residents 7 8 o —i m Future Adult Residents 7 9 o —i m Future Lifelong Residents ------- TABLE 7.1.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Industrial Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 8.7E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 8.7E-08 2.4E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00082 Naphthalene 9.8 mg/kg 3.0E-06 (mg/kg/day) NA (mg/kg/day)" 8.4E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00042 Dieldrin 0.11 mg/kg 3.4E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 5.4E-07 9.4E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0019 Aluminum 12000 mg/kg 3.7E-03 (mg/kg/day) NA (mg/kg/day)" 1.0E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.010 Antimony 11.3 mg/kg 3.5E-06 (mg/kg/day) NA (mg/kg/day)" 9.7E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.024 Arsenic 5.28 mg/kg 9.7E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.5E-06 2.7E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0090 Cobalt 7.59 mg/kg 2.3E-06 (mg/kg/day) NA (mg/kg/day)" 6.5E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.022 Copper 1240 mg/kg 3.8E-04 (mg/kg/day) NA (mg/kg/day)" 1.1E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.027 Iron 20200 mg/kg 6.2E-03 (mg/kg/day) NA (mg/kg/day)" 1.7E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.025 Lead 131 mg/kg 4.0E-05 (mg/kg/day) NA (mg/kg/day)" 1.1E-04 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 1.4E-04 (mg/kg/day) NA (mg/kg/day)" 3.9E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.016 Vanadium 27 mg/kg 8.3E-06 (mg/kg/day) NA (mg/kg/day)" 2.3E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0046 Zinc 705 mg/kg 2.2E-04 (mg/kg/day) NA (mg/kg/day)" 6.0E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0020 Exp. Route Total 2.1E-06 0.14 Dermal Benzo(a)pyrene 0.286 mg/kg 4.8E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 4.8E-08 1.3E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00045 Naphthalene 9.8 mg/kg 1.6E-06 (mg/kg/day) NA (mg/kg/day)" 4.6E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00023 Dieldrin 0.11 mg/kg 1.4E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.3E-07 4.0E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00080 Aluminum 12000 mg/kg 1.6E-04 (mg/kg/day) NA (mg/kg/day)" 4.3E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00043 Antimony 11.3 mg/kg 1.5E-07 (mg/kg/day) NA (mg/kg/day)" 4.1E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0068 Arsenic 5.28 mg/kg 2.0E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.1E-07 5.7E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0019 Cobalt 7.59 mg/kg 9.8E-08 (mg/kg/day) NA (mg/kg/day)" 2.8E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00092 Copper 1240 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" 4.5E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0011 Iron 20200 mg/kg 2.6E-04 (mg/kg/day) NA (mg/kg/day)" 7.3E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0010 Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 5.9E-06 (mg/kg/day) NA (mg/kg/day)" 1.7E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.017 Vanadium 27 mg/kg 3.5E-07 (mg/kg/day) NA (mg/kg/day)" 9.8E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0075 Zinc 705 mg/kg 9.1E-06 (mg/kg/day) NA (mg/kg/day)" 2.6E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000085 Exp. Route Total 5.8E-07 0.039 Exposure Point Total 2.7E-06 0.18 Exposure Medium Total 2.7E-06 0.18 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 7.2E-12 (mg/m3) 6.0E-04 (ug/m3)"1 4.3E-12 2.0E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000010 Naphthalene 1.7E-04 mg/m3 1.3E-05 (mg/m3) 3.4E-05 (ug/m3)"1 4.6E-07 3.8E-05 (mg/m3) 3.0E-03 (mg/m3) 0.013 Dieldrin 3.4E-11 mg/m3 2.8E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.3E-11 7.8E-12 (mg/m3) NA (mg/m3) Aluminum 3.7E-06 mg/m 3.0E-07 (mg/m3) NA (ug/m3)"1 8.5E-07 (mg/m3) 5.0E-03 (mg/m3) 0.00017 Antimony 3.5E-09 mg/m3 2.8E-10 (mg/m3) NA (ug/m3)"1 8.0E-10 (mg/m3) NA (mg/m3) Arsenic 1.6E-09 mg/m3 1.3E-10 (mg/m3) 4.3E-03 (ug/m3)"1 5.7E-10 3.7E-10 (mg/m3) 1.5E-05 (mg/m3) 0.000025 Cobalt 2.3E-09 mg/m3 1.9E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.7E-09 5.3E-10 (mg/m3) 6.0E-06 (mg/m3) 0.000089 Copper 3.8E-07 mg/m3 3.1E-08 (mg/m3) NA (ug/m3)"1 8.7E-08 (mg/m3) NA (mg/m3) Iron 6.2E-06 mg/m3 5.1E-07 (mg/m3) NA (ug/m3)"1 1.4E-06 (mg/m3) NA (mg/m3) Lead 4.0E-08 mg/m3 3.3E-09 (mg/m3) NA (ug/m3)"1 9.2E-09 (mg/m3) NA (mg/m3) Manganese 1.4E-07 mg/m3 1.1E-08 (mg/m3) NA (ug/m3)"1 3.2E-08 (mg/m3) 5.0E-05 (mg/m3) 0.00064 Vanadium 8.3E-09 mg/m3 6.8E-10 (mg/m3) NA (ug/m3)"1 1.9E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000019 Zinc 2.2E-07 mg/m3 1.8E-08 (mg/m3) NA (ug/m3)"1 5.0E-08 (mg/m3) NA (mg/m3) Exp. Route Total 4.6E-07 0.014 Exposure Point Total 4.6E-07 0.014 Exposure Medium Total 4.6E-07 0.014 Medium Total 3.1E-06 0.19 Total of Receptor Risks Across All Media 3.1E-06 Total of Receptor Hazards Across All Media 0.19 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.2.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 1.7E-06 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.7E-06 3.7E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.012 Naphthalene 9.8 mg/kg 1.1E-05 (mg/kg/day) NA (mg/kg/day)" 1.3E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0063 Dieldrin 0.11 mg/kg 1.2E-07 (mg/kg/day) 1.6E+01 (mg/kg/day)" 1.9E-06 1.4E-06 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.028 Aluminum 12000 mg/kg 1.3E-02 (mg/kg/day) NA (mg/kg/day)" 1.5E-01 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.15 Antimony 11.3 mg/kg 1.2E-05 (mg/kg/day) NA (mg/kg/day)" 1.4E-04 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.36 Arsenic 5.28 mg/kg 3.5E-06 (mg/kg/day) 1.5E+00 (mg/kg/day)" 5.2E-06 4.1E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.14 Cobalt 7.59 mg/kg 8.3E-06 (mg/kg/day) NA (mg/kg/day)" 9.7E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.32 Copper 1240 mg/kg 1.4E-03 (mg/kg/day) NA (mg/kg/day)" 1.6E-02 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.40 Iron 20200 mg/kg 2.2E-02 (mg/kg/day) NA (mg/kg/day)" 2.6E-01 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.37 Lead 131 mg/kg 1.4E-04 (mg/kg/day) NA (mg/kg/day)" 1.7E-03 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 5.0E-04 (mg/kg/day) NA (mg/kg/day)" 5.8E-03 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.24 Vanadium 27 mg/kg 3.0E-05 (mg/kg/day) NA (mg/kg/day)" 3.5E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.069 Zinc 705 mg/kg 7.7E-04 (mg/kg/day) NA (mg/kg/day)" 9.0E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.030 Exp. Route Total 8.8E-06 2.1 Dermal Benzo(a)pyrene 0.286 mg/kg 5.2E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 5.2E-07 1.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0038 Naphthalene 9.8 mg/kg 3.3E-06 (mg/kg/day) NA (mg/kg/day)" 3.9E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0019 Dieldrin 0.11 mg/kg 2.9E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 4.6E-07 3.3E-07 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0067 Aluminum 12000 mg/kg 3.1E-04 (mg/kg/day) NA (mg/kg/day)" 3.6E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0036 Antimony 11.3 mg/kg 2.9E-07 (mg/kg/day) NA (mg/kg/day)" 3.4E-06 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.057 Arsenic 5.28 mg/kg 4.1E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 6.2E-07 4.8E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.016 Cobalt 7.59 mg/kg 2.0E-07 (mg/kg/day) NA (mg/kg/day)" 2.3E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0077 Copper 1240 mg/kg 3.2E-05 (mg/kg/day) NA (mg/kg/day)" 3.8E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0094 Iron 20200 mg/kg 5.3E-04 (mg/kg/day) NA (mg/kg/day)" 6.1E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0088 Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 1.2E-05 (mg/kg/day) NA (mg/kg/day)" 1.4E-04 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.14 Vanadium 27 mg/kg 7.0E-07 (mg/kg/day) NA (mg/kg/day)" 8.2E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.063 Zinc 705 mg/kg 1.8E-05 (mg/kg/day) NA (mg/kg/day)" 2.1E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00071 Exp. Route Total 1.6E-06 0.32 Exposure Point Total 1.0E-05 2.4 Exposure Medium Total 1.0E-05 2.4 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 3.9E-11 (mg/m3) 6.0E-04 (ug/m3)"1 2.3E-11 8.5E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000042 Naphthalene 1.7E-04 mg/m3 1.4E-05 (mg/m3) 3.4E-05 (ug/m3)"1 4.6E-07 1.6E-04 (mg/m3) 3.0E-03 (mg/m3) 0.053 Dieldrin 3.4E-11 mg/m3 2.8E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.3E-11 3.3E-11 (mg/m3) NA (mg/m3) Aluminum 3.7E-06 mg/m 3.0E-07 (mg/m3) NA (ug/m3)"1 3.6E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00071 Antimony 3.5E-09 mg/m3 2.9E-10 (mg/m3) NA (ug/m3)"1 3.3E-09 (mg/m3) NA (mg/m3) Arsenic 1.6E-09 mg/m3 1.3E-10 (mg/m3) 4.3E-03 (ug/m3)"1 5.8E-10 1.6E-09 (mg/m3) 1.5E-05 (mg/m3) 0.00010 Cobalt 2.3E-09 mg/m3 1.9E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.7E-09 2.2E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00037 Copper 3.8E-07 mg/m3 3.1E-08 (mg/m3) NA (ug/m3)"1 3.7E-07 (mg/m3) NA (mg/m3) Iron 6.2E-06 mg/m3 5.1E-07 (mg/m3) NA (ug/m3)"1 6.0E-06 (mg/m3) NA (mg/m3) Lead 4.0E-08 mg/m3 3.3E-09 (mg/m3) NA (ug/m3)"1 3.9E-08 (mg/m3) NA (mg/m3) Manganese 1.4E-07 mg/m3 1.2E-08 (mg/m3) NA (ug/m3)"1 1.3E-07 (mg/m3) 5.0E-05 (mg/m3) 0.0027 Vanadium 8.3E-09 mg/m3 6.8E-10 (mg/m3) NA (ug/m3)"1 8.0E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000080 Zinc 2.2E-07 mg/m3 1.8E-08 (mg/m3) NA (ug/m3)"1 2.1E-07 (mg/m3) NA (mg/m3) Exp. Route Total 4.6E-07 0.057 Exposure Point Total 4.6E-07 0.057 Exposure Medium Total 4.6E-07 0.057 Medium Total 1.1E-05 2.5 ------- TABLE 7.2.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 2.3E-06 (mg/kg/day) NA (mg/kg/day)"1 2.7E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.09 [Nickel 1500 mg/kg 2.4E-04 (mg/kg/day) NA (mg/kg/day)"1 2.8E-03 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.14 I Exp. Route Total | 0.23 Dermal jCobalt 14 mg/kg 5.4E-08 (mg/kg/day) NA (mg/kg/day)"1 6.3E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00 | Nickel 1500 mg/kg 5.8E-06 (mg/kg/day) NA (mg/kg/day)"1 6.8E-05 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.085 Exp. Route Total jj 0.09 Exposure Point Total 0.32 Exposure Medium Total 0.32 Medium Total 0.32 Total of Receptor Risks Across All Media 1.1E-05 Total of Receptor Hazards Across All Media 2.8 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.3.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 2.0E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.0E-07 3.4E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0011 Naphthalene 9.8 mg/kg 3.4E-06 (mg/kg/day) NA (mg/kg/day)" 1.2E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00059 Dieldrin 0.11 mg/kg 3.8E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 6.0E-07 1.3E-07 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0026 Aluminum 12000 mg/kg 4.1E-03 (mg/kg/day) NA (mg/kg/day)" 1.4E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.014 Antimony 11.3 mg/kg 3.9E-06 (mg/kg/day) NA (mg/kg/day)" 1.4E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.034 Arsenic 5.28 mg/kg 1.1E-06 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.6E-06 3.8E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.013 Cobalt 7.59 mg/kg 2.6E-06 (mg/kg/day) NA (mg/kg/day)" 9.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.030 Copper 1240 mg/kg 4.2E-04 (mg/kg/day) NA (mg/kg/day)" 1.5E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.037 Iron 20200 mg/kg 6.9E-03 (mg/kg/day) NA (mg/kg/day)" 2.4E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.035 Lead 131 mg/kg 4.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.6E-04 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 1.6E-04 (mg/kg/day) NA (mg/kg/day)" 5.5E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.023 Vanadium 27 mg/kg 9.2E-06 (mg/kg/day) NA (mg/kg/day)" 3.2E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0065 Zinc 705 mg/kg 2.4E-04 (mg/kg/day) NA (mg/kg/day)" 8.5E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0028 Exp. Route Total 2.4E-06 0.20 Dermal Benzo(a)pyrene 0.286 mg/kg 1.1E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.1E-07 1.9E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00063 Naphthalene 9.8 mg/kg 1.8E-06 (mg/kg/day) NA (mg/kg/day)" 6.4E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00032 Dieldrin 0.11 mg/kg 1.6E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.5E-07 5.6E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0011 Aluminum 12000 mg/kg 1.7E-04 (mg/kg/day) NA (mg/kg/day)" 6.1E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00061 Antimony 11.3 mg/kg 1.6E-07 (mg/kg/day) NA (mg/kg/day)" 5.7E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0095 Arsenic 5.28 mg/kg 2.3E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.4E-07 8.0E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0027 Cobalt 7.59 mg/kg 1.1E-07 (mg/kg/day) NA (mg/kg/day)" 3.8E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0013 Copper 1240 mg/kg 1.8E-05 (mg/kg/day) NA (mg/kg/day)" 6.3E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0016 Iron 20200 mg/kg 2.9E-04 (mg/kg/day) NA (mg/kg/day)" 1.0E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0015 Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 6.6E-06 (mg/kg/day) NA (mg/kg/day)" 2.3E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.024 Vanadium 27 mg/kg 3.9E-07 (mg/kg/day) NA (mg/kg/day)" 1.4E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.011 Zinc 705 mg/kg 1.0E-05 (mg/kg/day) NA (mg/kg/day)" 3.6E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00012 Exp. Route Total 7.1E-07 0.054 Exposure Point Total 3.1E-06 0.25 Exposure Medium Total 3.1E-06 0.25 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 4.8E-11 (mg/m3) 6.0E-04 (ug/m3)"1 2.9E-11 8.5E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000042 Naphthalene 1.7E-04 mg/m3 4.5E-05 (mg/m3) 3.4E-05 (ug/m3)"1 1.5E-06 1.6E-04 (mg/m3) 3.0E-03 (mg/m3) 0.053 Dieldrin 3.4E-11 mg/m3 9.3E-12 (mg/m3) 4.6E-03 (ug/m3)"1 4.3E-11 3.3E-11 (mg/m3) NA (mg/m3) Aluminum 3.7E-06 mg/m 1.0E-06 (mg/m3) NA (ug/m3)"1 3.6E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00071 Antimony 3.5E-09 mg/m3 9.6E-10 (mg/m3) NA (ug/m3)"1 3.3E-09 (mg/m3) NA (mg/m3) Arsenic 1.6E-09 mg/m3 4.5E-10 (mg/m3) 4.3E-03 (ug/m3)"1 1.9E-09 1.6E-09 (mg/m3) 1.5E-05 (mg/m3) 0.00010 Cobalt 2.3E-09 mg/m3 6.4E-10 (mg/m3) 9.0E-03 (ug/m3)"1 5.8E-09 2.2E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00037 Copper 3.8E-07 mg/m3 1.0E-07 (mg/m3) NA (ug/m3)"1 3.7E-07 (mg/m3) NA (mg/m3) Iron 6.2E-06 mg/m3 1.7E-06 (mg/m3) NA (ug/m3)"1 6.0E-06 (mg/m3) NA (mg/m3) Lead 4.0E-08 mg/m3 1.1E-08 (mg/m3) NA (ug/m3)"1 3.9E-08 (mg/m3) NA (mg/m3) Manganese 1.4E-07 mg/m3 3.9E-08 (mg/m3) NA (ug/m3)"1 1.3E-07 (mg/m3) 5.0E-05 (mg/m3) 0.0027 Vanadium 8.3E-09 mg/m3 2.3E-09 (mg/m3) NA (ug/m3)"1 8.0E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000080 Zinc 2.2E-07 mg/m3 6.0E-08 (mg/m3) NA (ug/m3)"1 2.1E-07 (mg/m3) NA (mg/m3) Exp. Route Total 1.5E-06 0.057 Exposure Point Total 1.5E-06 0.057 Exposure Medium Total 1.5E-06 0.057 Medium Total 4.7E-06 0.31 ------- TABLE 7.3.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 7.1E-07 (mg/kg/day) NA (mg/kg/day)"1 2.5E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.008 [Nickel 1500 mg/kg 7.6E-05 (mg/kg/day) NA (mg/kg/day)"1 2.7E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.013 I Exp. Route Total | 0.022 Dermal jCobalt 14 mg/kg 3.0E-08 (mg/kg/day) NA (mg/kg/day)"1 1.1E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000 | Nickel 1500 mg/kg 3.2E-06 (mg/kg/day) NA (mg/kg/day)"1 1.1E-05 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.014 Exp. Route Total jj 0.014 Exposure Point Total 0.036 Exposure Medium Total 0.036 Medium Total 0.036 Total of Receptor Risks Across All Media 4.7E-06 Total of Receptor Hazards Across All Media 0.35 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.4.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 1.9E-06 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.9E-06 See Tables 7.2.RME and 7.3.RME for Hazard Indices Naphthalene 9.8 mg/kg 1.4E-05 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 1.6E-07 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.5E-06 Aluminum 12000 mg/kg 1.7E-02 (mg/kg/day) NA (mg/kg/day)" Antimony 11.3 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" Arsenic 5.28 mg/kg 4.6E-06 (mg/kg/day) 1.5E+00 (mg/kg/day)" 6.8E-06 Cobalt 7.59 mg/kg 1.1E-05 (mg/kg/day) NA (mg/kg/day)" Copper 1240 mg/kg 1.8E-03 (mg/kg/day) NA (mg/kg/day)" Iron 20200 mg/kg 2.9E-02 (mg/kg/day) NA (mg/kg/day)" Lead 131 mg/kg 1.9E-04 (mg/kg/day) NA (mg/kg/day)" Manganese 456 mg/kg 6.6E-04 (mg/kg/day) NA (mg/kg/day)" Vanadium 27 mg/kg 3.9E-05 (mg/kg/day) NA (mg/kg/day)" Zinc 705 mg/kg 1.0E-03 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 1.1E-05 Dermal Benzo(a)pyrene 0.286 mg/kg 6.2E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 6.2E-07 Naphthalene 9.8 mg/kg 5.2E-06 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 4.5E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 7.1E-07 Aluminum 12000 mg/kg 4.9E-04 (mg/kg/day) NA (mg/kg/day)" Antimony 11.3 mg/kg 4.6E-07 (mg/kg/day) NA (mg/kg/day)" Arsenic 5.28 mg/kg 6.4E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 9.6E-07 Cobalt 7.59 mg/kg 3.1E-07 (mg/kg/day) NA (mg/kg/day)" Copper 1240 mg/kg 5.0E-05 (mg/kg/day) NA (mg/kg/day)" Iron 20200 mg/kg 8.2E-04 (mg/kg/day) NA (mg/kg/day)" Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" Manganese 456 mg/kg 1.8E-05 (mg/kg/day) NA (mg/kg/day)" Vanadium 27 mg/kg 1.1E-06 (mg/kg/day) NA (mg/kg/day)" Zinc 705 mg/kg 2.9E-05 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 2.3E-06 Exposure Point Total 1.4E-05 Exposure Medium Total 1.4E-05 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 8.7E-11 (mg/m3) 6.0E-04 (ug/m3)"1 5.2E-11 Naphthalene 1.7E-04 mg/m3 5.9E-05 (mg/m3) 3.4E-05 (ug/m3)"1 2.0E-06 Dieldrin 3.4E-11 mg/m3 1.2E-11 (mg/m3) 4.6E-03 (ug/m3)"1 5.6E-11 Aluminum 3.7E-06 mg/m3 1.3E-06 (mg/m3) NA (ug/m3)"1 Antimony 3.5E-09 mg/m3 1.2E-09 (mg/m3) NA (ug/m3)"1 Arsenic 1.6E-09 mg/m3 5.8E-10 (mg/m3) 4.3E-03 (ug/m3)"1 2.5E-09 Cobalt 2.3E-09 mg/m3 8.3E-10 (mg/m3) 9.0E-03 (ug/m3)"1 7.5E-09 Copper 3.8E-07 mg/m3 1.4E-07 (mg/m3) NA (ug/m3)"1 Iron 6.2E-06 mg/m3 2.2E-06 (mg/m3) NA (ug/m3)"1 Lead 4.0E-08 mg/m3 1.4E-08 (mg/m3) NA (ug/m3)"1 Manganese 1.4E-07 mg/m3 5.0E-08 (mg/m3) NA (ug/m3)"1 Vanadium 8.3E-09 mg/m3 3.0E-09 (mg/m3) NA (ug/m3)"1 Zinc 2.2E-07 mg/m3 7.7E-08 (mg/m3) NA (ug/m3)"1 Exp. Route Total 2.0E-06 Exposure Point Total 2.0E-06 Exposure Medium Total 2.0E-06 Medium Total 1.6E-05 ------- TABLE 7.4.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 3.0E-06 (mg/kg/day) NA (mg/kg/day)"1 [Nickel 1500 mg/kg 3.2E-04 (mg/kg/day) NA (mg/kg/day)"1 I Exp. Route Total | Dermal jCobalt 14 mg/kg 8.4E-08 (mg/kg/day) NA (mg/kg/day)"1 | Nickel 1500 mg/kg 9.0E-06 (mg/kg/day) NA (mg/kg/day)"1 Exp. Route Total jj Exposure Point Total Exposure Medium Total Medium Total Total of Receptor Risks Across All Media 1.6E-05 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.5.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 1.0E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.0E-08 7.1E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0024 Naphthalene 9.8 mg/kg 4.0E-07 (mg/kg/day) NA (mg/kg/day)" 2.8E-05 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.000046 Dieldrin 0.11 mg/kg 4.4E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 7.1E-08 3.1E-07 (mg/kg/day) 1.0E-04 (mg/kg/day) 0.0031 Aluminum 9940 mg/kg 4.0E-04 (mg/kg/day) NA (mg/kg/day)" 2.8E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.028 Antimony 6.48 mg/kg 2.6E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.046 Arsenic 3.95 mg/kg 9.6E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.4E-07 6.7E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.022 Cobalt 6.32 mg/kg 2.6E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-05 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.0060 Copper 660 mg/kg 2.7E-05 (mg/kg/day) NA (mg/kg/day)" 1.9E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.047 Iron 19200 mg/kg 7.7E-04 (mg/kg/day) NA (mg/kg/day)" 5.4E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.077 Lead 71.4 mg/kg 2.9E-06 (mg/kg/day) NA (mg/kg/day)" 2.0E-04 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" 1.1E-03 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.046 Thallium 2.13 mg/kg 8.6E-08 (mg/kg/day) NA (mg/kg/day)" 6.0E-06 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.15 Vanadium 23.6 mg/kg 9.5E-07 (mg/kg/day) NA (mg/kg/day)" 6.7E-05 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.0067 Zinc 380 mg/kg 1.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.1E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0036 Exp. Route Total 2.2E-07 0.44 Dermal Benzo(a)pyrene 0.252 mg/kg 4.2E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 4.2E-09 3.0E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00099 Naphthalene 9.8 mg/kg 1.6E-07 (mg/kg/day) NA (mg/kg/day)" 1.2E-05 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.000019 Dieldrin 0.11 mg/kg 1.4E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.3E-08 1.0E-07 (mg/kg/day) 1.0E-04 (mg/kg/day) 0.00100 Aluminum 9940 mg/kg 1.3E-05 (mg/kg/day) NA (mg/kg/day)" 9.0E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00090 Antimony 6.48 mg/kg 8.4E-09 (mg/kg/day) NA (mg/kg/day)" 5.9E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0098 Arsenic 3.95 mg/kg 1.5E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.3E-08 1.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0036 Cobalt 6.32 mg/kg 8.2E-09 (mg/kg/day) NA (mg/kg/day)" 5.7E-07 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.00019 Copper 660 mg/kg 8.5E-07 (mg/kg/day) NA (mg/kg/day)" 6.0E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0015 Iron 19200 mg/kg 2.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.7E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0025 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 5.0E-07 (mg/kg/day) NA (mg/kg/day)" 3.5E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.037 Thallium 2.13 mg/kg 2.8E-09 (mg/kg/day) NA (mg/kg/day)" 1.9E-07 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.0048 Vanadium 23.6 mg/kg 3.1E-08 (mg/kg/day) NA (mg/kg/day)" 2.1E-06 (mg/kg/day) 2.6E-04 (mg/kg/day) 0.0082 Zinc 380 mg/kg 4.9E-07 (mg/kg/day) NA (mg/kg/day)" 3.4E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00011 Exp. Route Total 5.0E-08 0.070 Exposure Point Total 2.7E-07 0.51 Exposure Medium Total 2.7E-07 0.51 Air OWR Inhalation Benzo(a)pyrene 1.8E-07 mg/m3 5.9E-10 (mg/m3) 6.0E-04 (ug/m3)"1 3.5E-10 4.1E-08 (mg/m3) 2.0E-06 (mg/m3) 0.021 Naphthalene 9.6E-04 mg/m3 3.1E-06 (mg/m3) 3.4E-05 (ug/m3)"1 1.1E-07 2.2E-04 (mg/m3) 3.0E-03 (mg/m3) 0.073 Dieldrin 7.9E-08 mg/m3 2.6E-10 (mg/m3) 4.6E-03 (ug/m3)"1 1.2E-09 1.8E-08 (mg/m3) NA (mg/m3) Aluminum 7.1E-03 mg/m3 2.3E-05 (mg/m3) NA (ug/m3)"1 1.6E-03 (mg/m3) 5.0E-03 (mg/m3) 0.32 Antimony 4.6E-06 mg/m3 1.5E-08 (mg/m3) NA (ug/m3)"1 1.1E-06 (mg/m3) NA (mg/m3) Arsenic 2.8E-06 mg/m3 9.2E-09 (mg/m3) 4.3E-03 (ug/m3)"1 4.0E-08 6.4E-07 (mg/m3) 1.5E-05 (mg/m3) 0.043 Cobalt 4.5E-06 mg/m3 1.5E-08 (mg/m3) 9.0E-03 (ug/m3)"1 1.3E-07 1.0E-06 (mg/m3) 2.0E-05 (mg/m3) 0.052 Copper 4.7E-04 mg/m3 1.5E-06 (mg/m3) NA (ug/m3)"1 1.1E-04 (mg/m3) NA (mg/m3) Iron 1.4E-02 mg/m3 4.5E-05 (mg/m3) NA (ug/m3)"1 3.1E-03 (mg/m3) NA (mg/m3) Lead 5.1E-05 mg/m3 1.7E-07 (mg/m3) NA (ug/m3)"1 1.2E-05 (mg/m3) NA (mg/m3) Manganese 2.8E-04 mg/m3 9.0E-07 (mg/m3) NA (ug/m3)"1 6.3E-05 (mg/m3) 5.0E-05 (mg/m3) 1.27 Thallium 1.5E-06 mg/m3 5.0E-09 (mg/m3) NA (ug/m3)"1 3.5E-07 (mg/m3) NA (mg/m3) Vanadium 1.7E-05 mg/m 5.5E-08 (mg/m3) NA (ug/m3)"1 3.8E-06 (mg/m3) 1.0E-04 (mg/m3) 0.038 Zinc 2.7E-04 mg/m3 8.9E-07 (mg/m3) NA (ug/m3)"1 6.2E-05 (mg/m3) NA (mg/m3) Exp. Route Total 2.8E-07 1.8 Exposure Point Total 2.8E-07 1.8 Exposure Medium Total 2.8E-07 1.8 Medium Total 5.5E-07 2.3 ------- TABLE 7.5.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWR Ingestion 2-Butanone 2 ug/L 1.5E-09 (mg/kg/day) NA (mg/kg/day)" 1.0E-07 (mg/kg/day) 2.0E+00 (mg/kg/day) 5.1 E-8 cis-1,2-Dichloroethene 3.1 ug/L 2.3E-09 (mg/kg/day) NA (mg/kg/day)" 1.6E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0000080 Methyl tert-butyl ether 0.95 ug/L 7.0E-10 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.3E-12 4.9E-08 (mg/kg/day) NA (mg/kg/day) Trichloroethene 27 ug/L 2.0E-08 (mg/kg/day) 4.6E-02 (mg/kg/day)" 9.1E-10 1.4E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0028 1,4-Dioxane 3.8 ug/L 2.8E-09 (mg/kg/day) 1.0E-01 (mg/kg/day)" 2.8E-10 2.0E-07 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00000039 Caprolactam 3.7 ug/L 2.7E-09 (mg/kg/day) NA (mg/kg/day)" 1.9E-07 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00000038 Aluminum 114000 ug/L 8.4E-05 (mg/kg/day) NA (mg/kg/day)" 5.9E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0059 Antimony 0.46 ug/L 3.4E-10 (mg/kg/day) NA (mg/kg/day)" 2.4E-08 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.000059 Arsenic 60.1 ug/L 4.4E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 6.6E-08 3.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.010 Barium 3310 ug/L 2.4E-06 (mg/kg/day) NA (mg/kg/day)" 1.7E-04 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.00085 Beryllium 17.8 ug/L 1.3E-08 (mg/kg/day) NA (mg/kg/day)" 9.1E-07 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.00018 Cadmium 0.45 ug/L 3.3E-10 (mg/kg/day) NA (mg/kg/day)" 2.3E-08 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.000046 Cobalt 12.2 ug/L 9.0E-09 (mg/kg/day) NA (mg/kg/day)" 6.3E-07 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.00021 Copper 39.9 ug/L 2.9E-08 (mg/kg/day) NA (mg/kg/day)" 2.0E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000051 Iron 74900 ug/L 5.5E-05 (mg/kg/day) NA (mg/kg/day)" 3.8E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0055 Lead 206 ug/L 1.5E-07 (mg/kg/day) NA (mg/kg/day)" 1.1E-05 (mg/kg/day) NA (mg/kg/day) Manganese 1020 ug/L 7.5E-07 (mg/kg/day) NA (mg/kg/day)" 5.2E-05 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.0022 Mercury 0.091 ug/L 6.7E-11 (mg/kg/day) NA (mg/kg/day)" 4.7E-09 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0000023 Nickel 15.8 ug/L 1.2E-08 (mg/kg/day) NA (mg/kg/day)" 8.1E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000041 Selenium 1.6 ug/L 1.2E-09 (mg/kg/day) NA (mg/kg/day)" 8.2E-08 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.000016 Thallium 2.3 ug/L 1.7E-09 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.0030 Vanadium 30.5 ug/L 2.2E-08 (mg/kg/day) NA (mg/kg/day)" 1.6E-06 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.00016 Zinc 343 ug/L 2.5E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000059 Exp. Route Total 6.7E-08 0.031 Dermal 2-Butanone 2 ug/L 8.5E-10 (mg/kg/day) NA (mg/kg/day)" 5.9E-08 (mg/kg/day) 2.0E+00 (mg/kg/day) 3.0E-8 cis-1,2-Dichloroethene 3.1 ug/L 1.5E-08 (mg/kg/day) NA (mg/kg/day)" 1.0E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000052 Methyl tert-butyl ether 0.95 ug/L 8.9E-10 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.6E-12 6.2E-08 (mg/kg/day) NA (mg/kg/day) Trichloroethene 27 ug/L 1.4E-07 (mg/kg/day) 4.6E-02 (mg/kg/day)" 6.6E-09 1.0E-05 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.020 1,4-Dioxane 3.8 ug/L 5.6E-10 (mg/kg/day) 1.0E-01 (mg/kg/day)" 5.6E-11 4.0E-08 (mg/kg/day) 5.0E-01 (mg/kg/day) 7.9E-8 Caprolactam 3.7 ug/L 1.7E-09 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00000024 Aluminum 114000 ug/L 4.7E-05 (mg/kg/day) NA (mg/kg/day)" 3.3E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0033 Antimony 0.46 ug/L 1.9E-10 (mg/kg/day) NA (mg/kg/day)" 1.3E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00022 Arsenic 60.1 ug/L 2.5E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.7E-08 1.7E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0058 Barium 3310 ug/L 1.4E-06 (mg/kg/day) NA (mg/kg/day)" 9.6E-05 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.0069 Beryllium 17.8 ug/L 7.4E-09 (mg/kg/day) NA (mg/kg/day)" 5.2E-07 (mg/kg/day) 3.5E-05 (mg/kg/day) 0.015 Cadmium 0.45 ug/L 1.9E-10 (mg/kg/day) NA (mg/kg/day)" 1.3E-08 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.00052 Cobalt 12.2 ug/L 2.0E-09 (mg/kg/day) NA (mg/kg/day)" 1.4E-07 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.000047 Copper 39.9 ug/L 1.7E-08 (mg/kg/day) NA (mg/kg/day)" 1.2E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000029 Iron 74900 ug/L 3.1E-05 (mg/kg/day) NA (mg/kg/day)" 2.2E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0031 Lead 206 ug/L 8.5E-09 (mg/kg/day) NA (mg/kg/day)" 6.0E-07 (mg/kg/day) NA (mg/kg/day) Manganese 1020 ug/L 4.2E-07 (mg/kg/day) NA (mg/kg/day)" 3.0E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.031 Mercury 0.091 ug/L 3.8E-11 (mg/kg/day) NA (mg/kg/day)" 2.6E-09 (mg/kg/day) 1.4E-04 (mg/kg/day) 0.000019 Nickel 15.8 ug/L 1.3E-09 (mg/kg/day) NA (mg/kg/day)" 9.2E-08 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.00011 Selenium 1.6 ug/L 6.6E-10 (mg/kg/day) NA (mg/kg/day)" 4.6E-08 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0000093 Thallium 2.3 ug/L 9.5E-10 (mg/kg/day) NA (mg/kg/day)" 6.7E-08 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.0017 Vanadium 30.5 ug/L 1.3E-08 (mg/kg/day) NA (mg/kg/day)" 8.8E-07 (mg/kg/day) 2.6E-04 (mg/kg/day) 0.0034 Zinc 343 ug/L 8.5E-08 (mg/kg/day) NA (mg/kg/day)" 6.0E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000020 Exp. Route Total 4.4E-08 0.09 Exposure Point Total 1.1E-07 0.12 Exposure Medium Total 1.1E-07 0.12 ------- TABLE 7.5.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of Potential Concern EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Air OWR Inhalation 2-Butanone 9.4E-03 mg/m3 3.7E-06 (mg/m3) NA (ug/m3)"1 2.6E-04 (mg/m3) 1.0E+00 (mg/m3) 0.00026 cis-1,2-Dichloroethene 2.6E-02 mg/m3 1.0E-05 (mg/m3) NA (ug/m3)"1 7.1E-04 (mg/m3) NA (mg/m3) Methyl tert-butyl ether 7.7E-03 mg/m3 3.0E-06 (mg/m3) 2.6E-07 (ug/m3)"1 7.8E-10 2.1E-04 (mg/m3) 3.0E+00 (mg/m3) 0.000070 Trichloroethene 2.0E-01 mg/m3 7.7E-05 (mg/m3) 4.1E-06 (ug/m3)"1 3.1E-07 5.4E-03 (mg/m3) 2.0E-03 (mg/m3) 2.7 1,4-Dioxane 2.5E-03 mg/m3 9.8E-07 (mg/m3) 5.0E-06 (ug/m3)"1 4.9E-09 6.8E-05 (mg/m3) 7.2E-01 (mg/m3) 0.000095 Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.2E-03 (mg/m3) Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.5E-05 (mg/m3) Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-05 (mg/m3) Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-05 (mg/m3) Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 3.0E-04 (mg/m3) Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-04 (mg/m3) Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-02 (mg/m3) Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-04 (mg/m3) Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Exp. Route Total 3.2E-07 2.7 Exposure Point Total 3.2E-07 2.7 Exposure Medium Total 3.2E-07 2.7 Medium Total 4.3E-07 2.8 Total of Receptor Risks Across All Media 9.9E-07 Total of Receptor Hazards Across All Media 5.1 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.6.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 7.7E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 7.7E-08 2.2E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00072 Naphthalene 9.8 mg/kg 3.0E-06 (mg/kg/day) NA (mg/kg/day)" 8.4E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00042 Dieldrin 0.11 mg/kg 3.4E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 5.4E-07 9.4E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0019 Aluminum 9940 mg/kg 3.0E-03 (mg/kg/day) NA (mg/kg/day)" 8.5E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.009 Antimony 6.48 mg/kg 2.0E-06 (mg/kg/day) NA (mg/kg/day)" 5.5E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.014 Arsenic 3.95 mg/kg 7.2E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.1E-06 2.0E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0068 Cobalt 6.32 mg/kg 1.9E-06 (mg/kg/day) NA (mg/kg/day)" 5.4E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.018 Copper 660 mg/kg 2.0E-04 (mg/kg/day) NA (mg/kg/day)" 5.7E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.014 Iron 19200 mg/kg 5.9E-03 (mg/kg/day) NA (mg/kg/day)" 1.6E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.023 Lead 71.4 mg/kg 2.2E-05 (mg/kg/day) NA (mg/kg/day)" 6.1E-05 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.2E-04 (mg/kg/day) NA (mg/kg/day)" 3.3E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.014 Thallium 2.13 mg/kg 6.5E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-06 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.18 Vanadium 23.6 mg/kg 7.2E-06 (mg/kg/day) NA (mg/kg/day)" 2.0E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0040 Zinc 380 mg/kg 1.2E-04 (mg/kg/day) NA (mg/kg/day)" 3.3E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0011 Exp. Route Total 1.7E-06 0.29 Dermal Benzo(a)pyrene 0.252 mg/kg 4.2E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 4.2E-08 1.2E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00040 Naphthalene 9.8 mg/kg 1.6E-06 (mg/kg/day) NA (mg/kg/day)" 4.6E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00023 Dieldrin 0.11 mg/kg 1.4E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.3E-07 4.0E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00080 Aluminum 9940 mg/kg 1.3E-04 (mg/kg/day) NA (mg/kg/day)" 3.6E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00036 Antimony 6.48 mg/kg 8.4E-08 (mg/kg/day) NA (mg/kg/day)" 2.3E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0039 Arsenic 3.95 mg/kg 1.5E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.3E-07 4.3E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0014 Cobalt 6.32 mg/kg 8.2E-08 (mg/kg/day) NA (mg/kg/day)" 2.3E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00076 Copper 660 mg/kg 8.5E-06 (mg/kg/day) NA (mg/kg/day)" 2.4E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0006 Iron 19200 mg/kg 2.5E-04 (mg/kg/day) NA (mg/kg/day)" 7.0E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0010 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 5.0E-06 (mg/kg/day) NA (mg/kg/day)" 1.4E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.015 Thallium 2.13 mg/kg 2.8E-08 (mg/kg/day) NA (mg/kg/day)" 7.7E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0077 Vanadium 23.6 mg/kg 3.1E-07 (mg/kg/day) NA (mg/kg/day)" 8.6E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0066 Zinc 380 mg/kg 4.9E-06 (mg/kg/day) NA (mg/kg/day)" 1.4E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000046 Exp. Route Total 5.0E-07 0.038 Exposure Point Total 2.2E-06 0.33 Exposure Medium Total 2.2E-06 0.33 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 6.3E-12 (mg/m3) 6.0E-04 (ug/m3)"1 3.8E-12 1.8E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000009 Naphthalene 1.7E-04 mg/m3 1.3E-05 (mg/m3) 3.4E-05 (ug/m3)"1 4.6E-07 3.8E-05 (mg/m3) 3.0E-03 (mg/m3) 0.013 Dieldrin 3.4E-11 mg/m3 2.8E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.3E-11 7.8E-12 (mg/m3) NA (mg/m3) Aluminum 3.1E-06 mg/m3 2.5E-07 (mg/m3) NA (ug/m3)"1 7.0E-07 (mg/m3) 5.0E-03 (mg/m3) 0.00014 Antimony 2.0E-09 mg/m3 1.6E-10 (mg/m3) NA (ug/m3)"1 4.6E-10 (mg/m3) NA (mg/m3) Arsenic 1.2E-09 mg/m3 9.9E-11 (mg/m3) 4.3E-03 (ug/m3)"1 4.3E-10 2.8E-10 (mg/m3) 1.5E-05 (mg/m3) 0.000019 Cobalt 2.0E-09 mg/m3 1.6E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.4E-09 4.5E-10 (mg/m3) 6.0E-06 (mg/m3) 0.000074 Copper 2.0E-07 mg/m3 1.7E-08 (mg/m3) NA (ug/m3)"1 4.7E-08 (mg/m3) NA (mg/m3) Iron 5.9E-06 mg/m3 4.8E-07 (mg/m3) NA (ug/m3)"1 1.4E-06 (mg/m3) NA (mg/m3) Lead 2.2E-08 mg/m3 1.8E-09 (mg/m3) NA (ug/m3)"1 5.0E-09 (mg/m3) NA (mg/m3) Manganese 1.2E-07 mg/m3 9.8E-09 (mg/m3) NA (ug/m3)"1 2.7E-08 (mg/m3) 5.0E-05 (mg/m3) 0.00055 Thallium 6.6E-10 mg/m3 5.4E-11 (mg/m3) NA (ug/m3)"1 1.5E-10 (mg/m3) NA (mg/m3) Vanadium 7.3E-09 mg/m 5.9E-10 (mg/m3) NA (ug/m3)"1 1.7E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000017 Zinc 1.2E-07 mg/m3 9.6E-09 (mg/m3) NA (ug/m3)"1 2.7E-08 (mg/m3) NA (mg/m3) Exp. Route Total 4.6E-07 0.013 Exposure Point Total 4.6E-07 0.013 Exposure Medium Total 4.6E-07 0.013 Medium Total 2.7E-06 0.34 ------- TABLE 7.6.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 1300 ug/L 5.0E-03 (mg/kg/day) NA (mg/kg/day)" 1.4E-02 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.023 2-Hexanone 41 ug/L 1.6E-04 (mg/kg/day) NA (mg/kg/day)" 4.4E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.088 Chloroform 9.4 ug/L 3.6E-05 (mg/kg/day) 3.1E-02 (mg/kg/day)" 1.1E-06 1.0E-04 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.010 cis-1,2-Dichloroethene 1.88 ug/L 7.2E-06 (mg/kg/day) NA (mg/kg/day)" 2.0E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.010 Methyl Tert-Butyl Ether 15 ug/L 5.7E-05 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.0E-07 1.6E-04 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 2.5E-04 (mg/kg/day) 2.1E-03 (mg/kg/day)" 5.3E-07 7.0E-04 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.12 Trichloroethene 10.6 ug/L 4.1E-05 (mg/kg/day) 4.6E-02 (mg/kg/day)" 1.9E-06 1.1E-04 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.23 Vinyl Chloride 0.57 ug/L 2.2E-06 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.6E-06 6.1E-06 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.0020 1,4-Dioxane 3.84 ug/L 1.5E-05 (mg/kg/day) 1.0E-01 (mg/kg/day)" 1.5E-06 4.1E-05 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.0014 Bis(2-ethylhexyl)phthalate 11 ug/L 4.2E-05 (mg/kg/day) 1.4E-02 (mg/kg/day)" 5.9E-07 1.2E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0059 Caprolactam 2800 ug/L 1.1E-02 (mg/kg/day) NA (mg/kg/day)" 3.0E-02 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.060 Aluminum 57655 ug/L 2.2E-01 (mg/kg/day) NA (mg/kg/day)" 6.2E-01 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.62 Antimony 1.31 ug/L 5.0E-06 (mg/kg/day) NA (mg/kg/day)" 1.4E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.035 Arsenic 12.8 ug/L 4.9E-05 (mg/kg/day) 1.5E+00 (mg/kg/day)" 7.3E-05 1.4E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.46 Barium 674 ug/L 2.6E-03 (mg/kg/day) NA (mg/kg/day)" 7.2E-03 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.036 Beryllium 3.46 ug/L 1.3E-05 (mg/kg/day) NA (mg/kg/day)" 3.7E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.019 Cadmium 0.424 ug/L 1.6E-06 (mg/kg/day) NA (mg/kg/day)" 4.5E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0091 Cobalt 63.9 ug/L 2.4E-04 (mg/kg/day) NA (mg/kg/day)" 6.8E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 2.28 Copper 75.2 ug/L 2.9E-04 (mg/kg/day) NA (mg/kg/day)" 8.0E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.020 Iron 45400 ug/L 1.7E-01 (mg/kg/day) NA (mg/kg/day)" 4.9E-01 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.69 Lead 23.1 ug/L 8.8E-05 (mg/kg/day) NA (mg/kg/day)" 2.5E-04 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 9.7E-03 (mg/kg/day) NA (mg/kg/day)" 2.7E-02 (mg/kg/day) 2.4E-02 (mg/kg/day) 1.13 Mercury 0.128 ug/L 4.9E-07 (mg/kg/day) NA (mg/kg/day)" 1.4E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0046 Nickel 51.7 ug/L 2.0E-04 (mg/kg/day) NA (mg/kg/day)" 5.5E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.028 Selenium 3.1 ug/L 1.2E-05 (mg/kg/day) NA (mg/kg/day)" 3.3E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0066 Thallium 0.539 ug/L 2.1E-06 (mg/kg/day) NA (mg/kg/day)" 5.8E-06 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.58 Vanadium 12.3 ug/L 4.7E-05 (mg/kg/day) NA (mg/kg/day)" 1.3E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.026 Zinc 378 ug/L 1.4E-03 (mg/kg/day) NA (mg/kg/day)" 4.0E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.013 Exp. Route Total 8.1E-05 6.5 Dermal 2-Butanone 1300 ug/L 8.4E-06 (mg/kg/day) NA (mg/kg/day)" 2.4E-05 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.000039 2-Hexanone 41 ug/L 1.1E-06 (mg/kg/day) NA (mg/kg/day)" 3.2E-06 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.00064 Chloroform 9.4 ug/L 4.0E-07 (mg/kg/day) 3.1E-02 (mg/kg/day)" 1.2E-08 1.1E-06 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.00011 cis-1,2-Dichloroethene 1.88 ug/L 1.1E-07 (mg/kg/day) NA (mg/kg/day)" 3.0E-07 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.00015 Methyl Tert-Butyl Ether 15 ug/L 1.7E-07 (mg/kg/day) 1.8E-03 (mg/kg/day)" 3.1E-10 4.8E-07 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 2.0E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 4.1E-08 5.5E-05 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.009 Trichloroethene 10.6 ug/L 8.3E-07 (mg/kg/day) 4.6E-02 (mg/kg/day)" 3.8E-08 2.3E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0047 Vinyl Chloride 0.57 ug/L 1.6E-08 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.2E-08 4.6E-08 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.000015 1,4-Dioxane 3.84 ug/L 1.1E-08 (mg/kg/day) 1.0E-01 (mg/kg/day)" 1.1E-09 3.0E-08 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.0000010 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" 0.0E+00 (mg/kg/day) 2.0E-02 (mg/kg/day) Caprolactam 2800 ug/L 2.8E-05 (mg/kg/day) NA (mg/kg/day)" 7.9E-05 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00016 Aluminum 57655 ug/L 1.6E-04 (mg/kg/day) NA (mg/kg/day)" 4.4E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00044 Antimony 1.31 ug/L 3.5E-09 (mg/kg/day) NA (mg/kg/day)" 9.9E-09 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00016 Arsenic 12.8 ug/L 3.5E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 5.2E-08 9.7E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00032 Barium 674 ug/L 1.8E-06 (mg/kg/day) NA (mg/kg/day)" 5.1E-06 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.00036 Beryllium 3.46 ug/L 9.3E-09 (mg/kg/day) NA (mg/kg/day)" 2.6E-08 (mg/kg/day) 1.4E-05 (mg/kg/day) 0.0019 Cadmium 0.424 ug/L 1.1E-09 (mg/kg/day) NA (mg/kg/day)" 3.2E-09 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.00013 Cobalt 63.9 ug/L 6.9E-08 (mg/kg/day) NA (mg/kg/day)" 1.9E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00064 Copper 75.2 ug/L 2.0E-07 (mg/kg/day) NA (mg/kg/day)" 5.7E-07 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000014 Iron 45400 ug/L 1.2E-04 (mg/kg/day) NA (mg/kg/day)" 3.4E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00049 Lead 23.1 ug/L 6.2E-09 (mg/kg/day) NA (mg/kg/day)" 1.7E-08 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 6.8E-06 (mg/kg/day) NA (mg/kg/day)" 1.9E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.020 Mercury 0.128 ug/L 3.5E-10 (mg/kg/day) NA (mg/kg/day)" 9.7E-10 (mg/kg/day) 2.1E-05 (mg/kg/day) 0.000046 Nickel 51.7 ug/L 2.8E-08 (mg/kg/day) NA (mq/kq/dav) 7.8E-08 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.000098 Groundwater Groundwater ------- TABLE 7.6.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Selenium 3.1 ug/L 8.4E-09 (mg/kg/day) NA (mg/kg/day)"1 2.3E-08 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0000047 Thallium 0.539 ug/L 1.5E-09 (mg/kg/day) NA (mg/kg/day)"1 4.1E-09 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.00041 Vanadium 12.3 ug/L 3.3E-08 (mg/kg/day) NA (mg/kg/day)"1 9.3E-08 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.00071 Zinc 378 ug/L 6.1E-07 (mg/kg/day) NA (mg/kg/day)"1 1.7E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0000057 Exp. Route Total 1.6E-07 0.040 Exposure Point Total 8.1E-05 6.5 Exposure Medium Total 8.1E-05 6.5 Air OWR Inhalation 2-Butanone 1.7E-02 mg/m3 4.1E-03 (mg/m3) NA (ug/m3)"1 1.2E-02 (mg/m3) 5.0E+00 (mg/m3) 0.0023 2-Hexanone 6.5E-04 mg/m3 1.6E-04 (mg/m3) NA (ug/m3)"1 4.4E-04 (mg/m3) 3.0E-02 (mg/m3) 0.015 Chloroform 4.0E-04 mg/m3 9.8E-05 (mg/m3) 2.3E-05 (ug/m3)"1 2.2E-06 2.7E-04 (mg/m3) 9.8E-02 (mg/m3) 0.0028 cis-1,2-Dichloroethene 8.7E-05 mg/m3 2.1E-05 (mg/m3) NA (ug/m3)"1 5.9E-05 (mg/m3) NA (mg/m3) Methyl Tert-Butyl Ether 5.7E-04 mg/m3 1.4E-04 (mg/m3) 2.6E-07 (ug/m3)"1 3.6E-08 3.9E-04 (mg/m3) 3.0E+00 (mg/m3) 0.00013 Tetrachloroethene 2.6E-03 mg/m3 6.2E-04 (mg/m3) 2.6E-07 (ug/m3)"1 1.6E-07 1.7E-03 (mg/m3) 4.0E-02 (mg/m3) 0.044 Trichloroethene 4.5E-04 mg/m3 1.1E-04 (mg/m3) 4.1E-06 (ug/m3)"1 4.5E-07 3.1E-04 (mg/m3) 2.0E-03 (mg/m3) 0.15 Vinyl Chloride 3.2E-05 mg/m3 7.8E-06 (mg/m3) 4.4E-06 (ug/m3)"1 3.4E-08 2.2E-05 (mg/m3) 1.0E-01 (mg/m3) 0.00022 1,4-Dioxane 4.8E-06 mg/m3 1.2E-06 (mg/m3) 5.0E-06 (ug/m3)"1 5.9E-09 3.3E-06 (mg/m3) 3.0E-02 (mg/m3) 0.00011 Bis(2-ethylhexyl)phthalate 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-06 (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.2E-03 (mg/m3) Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.5E-05 (mg/m3) Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-04 (mg/m3) Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-05 (mg/m3) Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 0.0E+00 (mg/m3) 6.0E-06 (mg/m3) Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-05 (mg/m3) Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 3.0E-04 (mg/m3) Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 0.0E+00 (mg/m3) 9.0E-05 (mg/m3) Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-02 (mg/m3) Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-04 (mg/m3) Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Exp. Route Total 2.9E-06 0.22 Exposure Point Total 2.9E-06 0.22 Exposure Medium Total 2.9E-06 0.22 Medium Total 8.4E-05 6.7 Total of Receptor Risks Across All Media 8.6E-05 Total of Receptor Hazards Across All Media 7.1 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.7.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 1.5E-06 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.5E-06 3.2E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.011 Naphthalene 9.8 mg/kg 1.1E-05 (mg/kg/day) NA (mg/kg/day)" 1.3E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0063 Dieldrin 0.11 mg/kg 1.2E-07 (mg/kg/day) 1.6E+01 (mg/kg/day)" 1.9E-06 1.4E-06 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.028 Aluminum 9940 mg/kg 1.1E-02 (mg/kg/day) NA (mg/kg/day)" 1.3E-01 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.13 Antimony 6.48 mg/kg 7.1E-06 (mg/kg/day) NA (mg/kg/day)" 8.3E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.21 Arsenic 3.95 mg/kg 2.6E-06 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.9E-06 3.0E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.10 Cobalt 6.32 mg/kg 6.9E-06 (mg/kg/day) NA (mg/kg/day)" 8.1E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.27 Copper 660 mg/kg 7.2E-04 (mg/kg/day) NA (mg/kg/day)" 8.4E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.21 Iron 19200 mg/kg 2.1E-02 (mg/kg/day) NA (mg/kg/day)" 2.5E-01 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.35 Lead 71.4 mg/kg 7.8E-05 (mg/kg/day) NA (mg/kg/day)" 9.1E-04 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 4.3E-04 (mg/kg/day) NA (mg/kg/day)" 5.0E-03 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.21 Thallium 2.13 mg/kg 2.3E-06 (mg/kg/day) NA (mg/kg/day)" 2.7E-05 (mg/kg/day) 1.0E-05 (mg/kg/day) 2.7 Vanadium 23.6 mg/kg 2.6E-05 (mg/kg/day) NA (mg/kg/day)" 3.0E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.060 Zinc 380 mg/kg 4.2E-04 (mg/kg/day) NA (mg/kg/day)" 4.9E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.016 Exp. Route Total 7.3E-06 4.3 Dermal Benzo(a)pyrene 0.252 mg/kg 4.5E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 4.5E-07 9.9E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0033 Naphthalene 9.8 mg/kg 3.3E-06 (mg/kg/day) NA (mg/kg/day)" 3.9E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0019 Dieldrin 0.11 mg/kg 2.9E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 4.6E-07 3.3E-07 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0067 Aluminum 9940 mg/kg 2.6E-04 (mg/kg/day) NA (mg/kg/day)" 3.0E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0030 Antimony 6.48 mg/kg 1.7E-07 (mg/kg/day) NA (mg/kg/day)" 2.0E-06 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.033 Arsenic 3.95 mg/kg 3.1E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 4.6E-07 3.6E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.012 Cobalt 6.32 mg/kg 1.6E-07 (mg/kg/day) NA (mg/kg/day)" 1.9E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0064 Copper 660 mg/kg 1.7E-05 (mg/kg/day) NA (mg/kg/day)" 2.0E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0050 Iron 19200 mg/kg 5.0E-04 (mg/kg/day) NA (mg/kg/day)" 5.8E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0083 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.0E-05 (mg/kg/day) NA (mg/kg/day)" 1.2E-04 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.12 Thallium 2.13 mg/kg 5.5E-08 (mg/kg/day) NA (mg/kg/day)" 6.5E-07 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.065 Vanadium 23.6 mg/kg 6.1E-07 (mg/kg/day) NA (mg/kg/day)" 7.2E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.055 Zinc 380 mg/kg 9.9E-06 (mg/kg/day) NA (mg/kg/day)" 1.2E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00038 Exp. Route Total 1.4E-06 0.32 Exposure Point Total 8.7E-06 4.6 Exposure Medium Total 8.7E-06 4.6 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 3.4E-11 (mg/m3) 6.0E-04 (ug/m3)"1 2.0E-11 7.5E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000037 Naphthalene 1.7E-04 mg/m3 1.4E-05 (mg/m3) 3.4E-05 (ug/m3)"1 4.6E-07 1.6E-04 (mg/m3) 3.0E-03 (mg/m3) 0.053 Dieldrin 3.4E-11 mg/m3 2.8E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.3E-11 3.3E-11 (mg/m3) NA (mg/m3) Aluminum 3.1E-06 mg/m3 2.5E-07 (mg/m3) NA (ug/m3)"1 2.9E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00059 Antimony 2.0E-09 mg/m3 1.6E-10 (mg/m3) NA (ug/m3)"1 1.9E-09 (mg/m3) NA (mg/m3) Arsenic 1.2E-09 mg/m3 1.0E-10 (mg/m3) 4.3E-03 (ug/m3)"1 4.3E-10 1.2E-09 (mg/m3) 1.5E-05 (mg/m3) 0.000078 Cobalt 2.0E-09 mg/m3 1.6E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.4E-09 1.9E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00031 Copper 2.0E-07 mg/m3 1.7E-08 (mg/m3) NA (ug/m3)"1 2.0E-07 (mg/m3) NA (mg/m3) Iron 5.9E-06 mg/m3 4.9E-07 (mg/m3) NA (ug/m3)"1 5.7E-06 (mg/m3) NA (mg/m3) Lead 2.2E-08 mg/m3 1.8E-09 (mg/m3) NA (ug/m3)"1 2.1E-08 (mg/m3) NA (mg/m3) Manganese 1.2E-07 mg/m3 9.8E-09 (mg/m3) NA (ug/m3)"1 1.1E-07 (mg/m3) 5.0E-05 (mg/m3) 0.0023 Thallium 6.6E-10 mg/m3 5.4E-11 (mg/m3) NA (ug/m3)"1 6.3E-10 (mg/m3) NA (mg/m3) Vanadium 7.3E-09 mg/m3 6.0E-10 (mg/m3) NA (ug/m3)"1 7.0E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000070 Zinc 1.2E-07 mg/m3 9.6E-09 (mg/m3) NA (ug/m3)"1 1.1E-07 (mg/m3) NA (mg/m3) Exp. Route Total 4.6E-07 0.056 Exposure Point Total 4.6E-07 0.056 Exposure Medium Total 4.6E-07 0.056 Medium Total 9.1E-06 4.7 ------- TABLE 7.7.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 1300 ug/L 5.6E-03 (mg/kg/day) NA (mg/kg/day)" 6.5E-02 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.11 2-Hexanone 41 ug/L 1.8E-04 (mg/kg/day) NA (mg/kg/day)" 2.0E-03 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.41 Chloroform 9.4 ug/L 4.0E-05 (mg/kg/day) 3.1E-02 (mg/kg/day)" 1.2E-06 4.7E-04 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.047 cis-1,2-Dichloroethene 1.88 ug/L 8.0E-06 (mg/kg/day) NA (mg/kg/day)" 9.4E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.047 Methyl Tert-Butyl Ether 15 ug/L 6.4E-05 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.2E-07 7.5E-04 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 2.8E-04 (mg/kg/day) 2.1E-03 (mg/kg/day)" 5.9E-07 3.3E-03 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.55 Trichloroethene (Mutagenic) 10.6 ug/L 2.4E-04 (mg/kg/day) 9.3E-03 (mg/kg/day)" 2.2E-06 5.3E-04 (mg/kg/day) NA (mg/kg/day) Trichloroethene (Nonmutagenic 10.6 ug/L 4.5E-05 (mg/kg/day) 3.7E-02 (mg/kg/day)" 1.7E-06 5.3E-04 (mg/kg/day) 5.0E-04 (mg/kg/day) 1.06 Vinyl Chloride 0.57 ug/L 3.2E-05 (mg/kg/day) 7.2E-01 (mg/kg/day)" 2.3E-05 2.8E-05 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.0095 1,4-Dioxane 3.84 ug/L 1.6E-05 (mg/kg/day) 1.0E-01 (mg/kg/day)" 1.6E-06 1.9E-04 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.0064 Bis(2-ethylhexyl)phthalate 11 ug/L 4.7E-05 (mg/kg/day) 1.4E-02 (mg/kg/day)" 6.6E-07 5.5E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.027 Caprolactam 2800 ug/L 1.2E-02 (mg/kg/day) NA (mg/kg/day)" 1.4E-01 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.28 Aluminum 57655 ug/L 2.5E-01 (mg/kg/day) NA (mg/kg/day)" 2.9E+00 (mg/kg/day) 1.0E+00 (mg/kg/day) 2.9 Antimony 1.31 ug/L 5.6E-06 (mg/kg/day) NA (mg/kg/day)" 6.5E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.16 Arsenic 12.8 ug/L 5.5E-05 (mg/kg/day) 1.5E+00 (mg/kg/day)" 8.2E-05 6.4E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 2.1 Barium 674 ug/L 2.9E-03 (mg/kg/day) NA (mg/kg/day)" 3.4E-02 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.17 Beryllium 3.46 ug/L 1.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.7E-04 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.086 Cadmium 0.424 ug/L 1.8E-06 (mg/kg/day) NA (mg/kg/day)" 2.1E-05 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.042 Cobalt 63.9 ug/L 2.7E-04 (mg/kg/day) NA (mg/kg/day)" 3.2E-03 (mg/kg/day) 3.0E-04 (mg/kg/day) 10.6 Copper 75.2 ug/L 3.2E-04 (mg/kg/day) NA (mg/kg/day)" 3.7E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.094 Iron 45400 ug/L 1.9E-01 (mg/kg/day) NA (mg/kg/day)" 2.3E+00 (mg/kg/day) 7.0E-01 (mg/kg/day) 3.2 Lead 23.1 ug/L 9.9E-05 (mg/kg/day) NA (mg/kg/day)" 1.2E-03 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 1.1E-02 (mg/kg/day) NA (mg/kg/day)" 1.3E-01 (mg/kg/day) 2.4E-02 (mg/kg/day) 5.2 Mercury 0.128 ug/L 5.5E-07 (mg/kg/day) NA (mg/kg/day)" 6.4E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.021 Nickel 51.7 ug/L 2.2E-04 (mg/kg/day) NA (mg/kg/day)" 2.6E-03 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.13 Selenium 3.1 ug/L 1.3E-05 (mg/kg/day) NA (mg/kg/day)" 1.5E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.031 Thallium 0.539 ug/L 2.3E-06 (mg/kg/day) NA (mg/kg/day)" 2.7E-05 (mg/kg/day) 1.0E-05 (mg/kg/day) 2.7 Vanadium 12.3 ug/L 5.3E-05 (mg/kg/day) NA (mg/kg/day)" 6.1E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.12 Zinc 378 ug/L 1.6E-03 (mg/kg/day) NA (mg/kg/day)" 1.9E-02 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.063 Exp. Route Total 1.1E-04 30 Dermal 2-Butanone 1300 ug/L 4.6E-05 (mg/kg/day) NA (mg/kg/day)" 5.3E-04 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.00089 2-Hexanone 41 ug/L 6.4E-06 (mg/kg/day) NA (mg/kg/day)" 7.4E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.015 Chloroform 9.4 ug/L 3.2E-06 (mg/kg/day) 3.1E-02 (mg/kg/day)" 9.9E-08 3.7E-05 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.0037 cis-1,2-Dichloroethene 1.88 ug/L 8.9E-07 (mg/kg/day) NA (mg/kg/day)" 1.0E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0052 Methyl Tert-Butyl Ether 15 ug/L 1.3E-06 (mg/kg/day) 1.8E-03 (mg/kg/day)" 2.3E-09 1.5E-05 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 1.5E-04 (mg/kg/day) 2.1E-03 (mg/kg/day)" 3.1E-07 1.7E-03 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.29 Trichloroethene (Mutagenic) 10.6 ug/L 3.5E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 3.3E-07 7.7E-05 (mg/kg/day) NA (mg/kg/day) Trichloroethene (Nonmutagenic 10.6 ug/L 6.6E-06 (mg/kg/day) 3.7E-02 (mg/kg/day)" 2.4E-07 7.7E-05 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.15 Vinyl Chloride 0.57 ug/L 2.2E-06 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.6E-06 1.9E-06 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.00064 1,4-Dioxane 3.84 ug/L 5.2E-08 (mg/kg/day) 1.0E-01 (mg/kg/day)" 5.2E-09 6.0E-07 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.000020 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" 0.0E+00 (mg/kg/day) 2.0E-02 (mg/kg/day) Caprolactam 2800 ug/L 1.3E-04 (mg/kg/day) NA (mg/kg/day)" 1.6E-03 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.0031 Aluminum 57655 ug/L 1.1E-03 (mg/kg/day) NA (mg/kg/day)" 1.3E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.013 Antimony 1.31 ug/L 2.5E-08 (mg/kg/day) NA (mg/kg/day)" 2.9E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0048 Arsenic 12.8 ug/L 2.4E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.6E-07 2.8E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0094 Barium 674 ug/L 1.3E-05 (mg/kg/day) NA (mg/kg/day)" 1.5E-04 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.011 Beryllium 3.46 ug/L 6.5E-08 (mg/kg/day) NA (mg/kg/day)" 7.6E-07 (mg/kg/day) 1.4E-05 (mg/kg/day) 0.054 Cadmium 0.424 ug/L 8.0E-09 (mg/kg/day) NA (mg/kg/day)" 9.3E-08 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.0037 Cobalt 63.9 ug/L 4.8E-07 (mg/kg/day) NA (mg/kg/day)" 5.6E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.019 Copper 75.2 ug/L 1.4E-06 (mg/kg/day) NA (mg/kg/day)" 1.7E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00041 Iron 45400 ug/L 8.6E-04 (mg/kg/day) NA (mg/kg/day)" 1.0E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.014 Lead 23.1 ug/L 4.4E-08 (mg/kg/day) NA (mg/kg/day)" 5.1E-07 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 4.8E-05 (mg/kg/day) NA (mq/kq/dav) 5.5E-04 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.58 Groundwater Groundwater ------- TABLE 7.7.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Mercury 0.128 ug/L 2.4E-09 (mg/kg/day) NA (mg/kg/day)" 2.8E-08 (mg/kg/day) 2.1E-05 (mg/kg/day) 0.0013 Nickel 51.7 ug/L 1.9E-07 (mg/kg/day) NA (mg/kg/day)" 2.3E-06 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0028 Selenium 3.1 ug/L 5.8E-08 (mg/kg/day) NA (mg/kg/day)" 6.8E-07 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.00014 Thallium 0.539 ug/L 1.0E-08 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.012 Vanadium 12.3 ug/L 2.3E-07 (mg/kg/day) NA (mg/kg/day)" 2.7E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.021 Zinc 378 ug/L 4.3E-06 (mg/kg/day) NA (mg/kg/day)" 5.0E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00017 Exp. Route Total 2.9E-06 1.21 Exposure Point Total 1.2E-04 31 Exposure Medium Total 1.2E-04 31 Medium Total 1.2E-04 31 Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 2.3E-06 (mg/kg/day) NA (mg/kg/day)"1 2.7E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.09 Nickel 1500 mg/kg 2.4E-04 (mg/kg/day) NA (mg/kg/day)"1 2.8E-03 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.14 Exp. Route Total 0.23 Dermal Cobalt 14 mg/kg 5.4E-08 (mg/kg/day) NA (mg/kg/day)"1 6.3E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00 Nickel 1500 mg/kg 5.8E-06 (mg/kg/day) NA (mg/kg/day)"1 6.8E-05 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.085 Exp. Route Total 0.09 Exposure Point Total 0.32 Exposure Medium Total 0.32 Medium Total 0.32 Total of Receptor Risks Across All Media 1.3E-04 Total of Receptor Hazards Across All Media 36 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.8.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 1.7E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.7E-07 3.0E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0010 Naphthalene 9.8 mg/kg 3.4E-06 (mg/kg/day) NA (mg/kg/day)" 1.2E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00059 Dieldrin 0.11 mg/kg 3.8E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 6.0E-07 1.3E-07 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0026 Aluminum 9940 mg/kg 3.4E-03 (mg/kg/day) NA (mg/kg/day)"1 1.2E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.012 Antimony 6.48 mg/kg 2.2E-06 (mg/kg/day) NA (mg/kg/day)" 7.8E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.019 Arsenic 3.95 mg/kg 8.1E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.2E-06 2.8E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0095 Cobalt 6.32 mg/kg 2.2E-06 (mg/kg/day) NA (mg/kg/day)" 7.6E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.025 Copper 660 mg/kg 2.3E-04 (mg/kg/day) NA (mg/kg/day)" 7.9E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.020 Iron 19200 mg/kg 6.6E-03 (mg/kg/day) NA (mg/kg/day)" 2.3E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.033 Lead 71.4 mg/kg 2.4E-05 (mg/kg/day) NA (mg/kg/day)" 8.6E-05 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.3E-04 (mg/kg/day) NA (mg/kg/day)" 4.7E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.019 Thallium 2.13 mg/kg 7.3E-07 (mg/kg/day) NA (mg/kg/day)" 2.6E-06 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.26 Vanadium 23.6 mg/kg 8.1E-06 (mg/kg/day) NA (mg/kg/day)" 2.8E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0057 Zinc 380 mg/kg 1.3E-04 (mg/kg/day) NA (mg/kg/day)" 4.6E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0015 Exp. Route Total 2.0E-06 0.40 Dermal Benzo(a)pyrene 0.252 mg/kg 9.5E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 9.5E-08 1.7E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00055 Naphthalene 9.8 mg/kg 1.8E-06 (mg/kg/day) NA (mg/kg/day)" 6.4E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00032 Dieldrin 0.11 mg/kg 1.6E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.5E-07 5.6E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0011 Aluminum 9940 mg/kg 1.4E-04 (mg/kg/day) NA (mg/kg/day)" 5.0E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00050 Antimony 6.48 mg/kg 9.4E-08 (mg/kg/day) NA (mg/kg/day)" 3.3E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0055 Arsenic 3.95 mg/kg 1.7E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.6E-07 6.0E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0020 Cobalt 6.32 mg/kg 9.1E-08 (mg/kg/day) NA (mg/kg/day)" 3.2E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0011 Copper 660 mg/kg 9.5E-06 (mg/kg/day) NA (mg/kg/day)" 3.3E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00084 Iron 19200 mg/kg 2.8E-04 (mg/kg/day) NA (mg/kg/day)" 9.7E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0014 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 5.6E-06 (mg/kg/day) NA (mg/kg/day)" 2.0E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.020 Thallium 2.13 mg/kg 3.1E-08 (mg/kg/day) NA (mg/kg/day)" 1.1E-07 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.011 Vanadium 23.6 mg/kg 3.4E-07 (mg/kg/day) NA (mg/kg/day)" 1.2E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0092 Zinc 380 mg/kg 5.5E-06 (mg/kg/day) NA (mg/kg/day)" 1.9E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000064 Exp. Route Total 6.1E-07 0.054 Exposure Point Total 2.6E-06 0.46 Exposure Medium Total 2.6E-06 0.46 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 4.3E-11 (mg/m3) 6.0E-04 (ug/m3)"1 2.6E-11 7.5E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000037 Naphthalene 1.7E-04 mg/m3 4.5E-05 (mg/m3) 3.4E-05 (ug/m3)"1 1.5E-06 1.6E-04 (mg/m3) 3.0E-03 (mg/m3) 0.053 Dieldrin 3.4E-11 mg/m3 9.3E-12 (mg/m3) 4.6E-03 (ug/m3)"1 4.3E-11 3.3E-11 (mg/m3) NA (mg/m3) - Aluminum 3.1E-06 mg/m3 8.4E-07 (mg/m3) NA (ug/m3)"1 2.9E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00059 Antimony 2.0E-09 mg/m3 5.5E-10 (mg/m3) NA (ug/m3)"1 1.9E-09 (mg/m3) NA (mg/m3) - Arsenic 1.2E-09 mg/m3 3.3E-10 (mg/m3) 4.3E-03 (ug/m3)"1 1.4E-09 1.2E-09 (mg/m3) 1.5E-05 (mg/m3) 0.000078 Cobalt 2.0E-09 mg/m3 5.3E-10 (mg/m3) 9.0E-03 (ug/m3)"1 4.8E-09 1.9E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00031 Copper 2.0E-07 mg/m3 5.6E-08 (mg/m3) NA (ug/m3)"1 2.0E-07 (mg/m3) NA (mg/m3) - Iron 5.9E-06 mg/m3 1.6E-06 (mg/m3) NA (ug/m3)"1 5.7E-06 (mg/m3) NA (mg/m3) - Lead 2.2E-08 mg/m3 6.0E-09 (mg/m3) NA (ug/m3)"1 2.1E-08 (mg/m3) NA (mg/m3) - Manganese 1.2E-07 mg/m3 3.3E-08 (mg/m3) NA (ug/m3)"1 1.1E-07 (mg/m3) 5.0E-05 (mg/m3) 0.0023 Thallium 6.6E-10 mg/m3 1.8E-10 (mg/m3) NA (ug/m3)"1 6.3E-10 (mg/m3) NA (mg/m3) - Vanadium 7.3E-09 mg/m3 2.0E-09 (mg/m3) NA (ug/m3)"1 7.0E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000070 Zinc 1.2E-07 mg/m3 3.2E-08 (mg/m3) NA (ug/m3)"1 1.1E-07 (mg/m3) NA (mg/m3) - Exp. Route Total 1.5E-06 0.056 Exposure Point Total 1.5E-06 0.056 Exposure Medium Total 1.5E-06 0.056 Medium Total 4.1E-06 0.51 ------- TABLE 7.8.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Exposure Medium Chemical of Potential Concern Cancer Risk Calculations Intake/Exposure Concentration Value Units CSF/Unit Risk Units Non-Cancer Hazard Calculations Intake/Exposure Concentration Value Units Hazard Quotient Value Units 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylhexyl)phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Vanadium Zinc 65.7 10.6 10.6 0.57 3.84 11 2800 57655 1.31 12.8 674 3.46 0.424 63.9 75.2 45400 23.1 2525 0.128 51.7 3.1 0.539 12.3 378 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylhexyl)phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese 65.7 10.6 10.6 0.57 3.84 11 2800 57655 1.31 12.8 674 3.46 0.424 63.9 75.2 45400 23.1 2525 1.1E-02 3.5E-04 8.0E-05 1.6E-05 1.3E-04 5.6E-04 1.8E-04 9.1E-05 4.9E-06 3.3E-05 9.4E-05 2.4E-02 4.9E-01 1.1E-05 1.1E-04 5.8E-03 3.0E-05 3.6E-06 5.5E-04 6.4E-04 3.9E-01 2.0E-04 2.2E-02 1.1E-06 4.4E-04 2.7E-05 4.6E-06 1.1E-04 3.2E-03 (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) NA 1.8E-03 2.1E-03 9.3E-03 3.7E-02 7.2E-01 1.0E-01 1.4E-02 NA mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/da^ 9.2E-05 1.2E-05 4.2E-06 1.1E-06 1.8E-06 2.1E-04 1.8E-05 8.8E-06 1.8E-07 1.1E-07 0.0E+00 3.0E-04 2.8E-03 6.3E-08 6.1E-07 3.2E-05 1.7E-07 2.0E-08 1.2E-06 3.6E-06 2.2E-03 1.1E-07 1.2E-04 (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) (mg/kg/day) NA 1.8E-03 2.1E-03 9.3E-03 3.7E-02 7.2E-01 1.0E-01 1.4E-02 NA mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mq/kq/das 2.3E-07 1.2E-06 1.7E-06 3.4E-06 3.5E-06 3.3E-06 1.3E-06 3.9E-02 1.2E-03 2.8E-04 5.6E-05 4.5E-04 2.0E-03 3.2E-04 3.2E-04 1.7E-05 1.2E-04 3.3E-04 8.4E-02 1.7E+00 3.9E-05 3.8E-04 2.0E-02 1.0E-04 1.3E-05 1.9E-03 2.3E-03 1.4E+00 6.9E-04 7.6E-02 3.8E-06 1.5E-03 9.3E-05 1.6E-05 3.7E-04 1.1E-02 mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day 3.3E-09 4.3E-07 1.6E-07 3.2E-07 1.3E-07 1.1E-08 3.2E-04 4.2E-05 1.5E-05 3.9E-06 6.4E-06 7.2E-04 3.1E-05 3.1E-05 6.3E-07 4.0E-07 0.0E+00 1.0E-03 9.6E-03 2.2E-07 2.1E-06 1.1E-04 5.8E-07 7.1E-08 4.3E-06 1.3E-05 7.6E-03 3.9E-07 4.2E-04 mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day 6.0E-01 5.0E-03 1.0E-02 2.0E-03 NA 6.0E-03 NA 5.0E-04 3.0E-03 3.0E-02 2.0E-02 5.0E-01 1.0E+00 4.0E-04 3.0E-04 2.0E-01 2.0E-03 5.0E-04 3.0E-04 4.0E-02 7.0E-01 NA 2.4E-02 3.0E-04 2.0E-02 5.0E-03 1.0E-05 5.0E-03 3.0E-01 mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day 6.0E-01 5.0E-03 1.0E-02 2.0E-03 NA 6.0E-03 NA 5.0E-04 3.0E-03 3.0E-02 2.0E-02 5.0E-01 1.0E+00 6.0E-05 3.0E-04 1.4E-02 1.4E-05 2.5E-05 3.0E-04 4.0E-02 7.0E-01 NA mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day 0.065 0.25 0.028 0.028 0.64 0.0057 0.0038 0.016 0.17 1.7 0.10 0.052 0.025 0.013 0.077 0.019 1.6 0.074 0.038 18 0.00054 0.0084 0.0015 0.0019 0.06 0.00021 0.000013 0.0021 0.0096 0.0037 0.0071 0.0081 0.041 0.0028 0.014 0.00031 0.011 ------- TABLE 7.8.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Mercury 0.128 ug/L 6.1E-09 (mg/kg/day) NA (mg/kg/day)" 2.1E-08 (mg/kg/day) 2.1E-05 (mg/kg/day) 0.0010 Nickel 51.7 ug/L 4.9E-07 (mg/kg/day) NA (mg/kg/day)" 1.7E-06 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0022 Selenium 3.1 ug/L 1.5E-07 (mg/kg/day) NA (mg/kg/day)" 5.2E-07 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.00010 Thallium 0.539 ug/L 2.6E-08 (mg/kg/day) NA (mg/kg/day)" 9.0E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0090 Vanadium 12.3 ug/L 5.9E-07 (mg/kg/day) NA (mg/kg/day)" 2.1E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.016 Zinc 378 ug/L 1.1E-05 (mg/kg/day) NA (mg/kg/day)" 3.8E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00013 Exp. Route Total 2.1E-06 0.76 Exposure Point Total 1.8E-04 19 Exposure Medium Total 1.8E-04 19 Air OWR Inhalation 2-Butanone 2.2E-01 mg/m3 6.0E-02 (mg/m3) NA (ug/m3)"1 2.1E-01 (mg/m3) 5.0E+00 (mg/m3) 0.042 2-Hexanone 8.4E-03 mg/m3 2.3E-03 (mg/m3) NA (ug/m3)"1 8.1E-03 (mg/m3) 3.0E-02 (mg/m3) 0.27 Chloroform 5.2E-03 mg/m3 1.4E-03 (mg/m3) 2.3E-05 (ug/m3)"1 3.3E-05 5.0E-03 (mg/m3) 9.8E-02 (mg/m3) 0.051 cis-1,2-Dichloroethene 1.1E-03 mg/m3 3.1E-04 (mg/m3) NA (ug/m3)"1 1.1E-03 (mg/m3) NA (mg/m3) - Methyl Tert-Butyl Ether 7.4E-03 mg/m3 2.0E-03 (mg/m3) 2.6E-07 (ug/m3)"1 5.3E-07 7.1E-03 (mg/m3) 3.0E+00 (mg/m3) 0.0024 Tetrachloroethene 3.3E-02 mg/m3 9.1E-03 (mg/m3) 2.6E-07 (ug/m3)"1 2.4E-06 3.2E-02 (mg/m3) 4.0E-02 (mg/m3) 0.79 Trichloroethene (Mutagenic) 5.8E-03 mg/m3 3.2E-03 (mg/m3) 1.0E-06 (ug/m3)"1 3.2E-06 5.6E-03 (mg/m3) NA (mg/m3) - Trichloroethene (Nonmutagenic) 5.8E-03 mg/m3 1.6E-03 (mg/m3) 3.1E-06 (ug/m3)"1 4.9E-06 5.6E-03 (mg/m3) 2.0E-03 (mg/m3) 2.8 Vinyl Chloride 4.1E-04 mg/m3 1.1E-04 (mg/m3) 4.4E-06 (ug/m3)"1 5.0E-07 4.0E-04 (mg/m3) 1.0E-01 (mg/m3) 0.0040 1,4-Dioxane 6.3E-05 mg/m3 1.7E-05 (mg/m3) 5.0E-06 (ug/m3)"1 8.6E-08 6.0E-05 (mg/m3) 3.0E-02 (mg/m3) 0.0020 Bis(2-ethylhexyl)phthalate 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-06 (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.2E-03 (mg/m3) - Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) - Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.5E-05 (mg/m3) - Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-04 (mg/m3) - Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) - Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-05 (mg/m3) - Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 0.0E+00 (mg/m3) 6.0E-06 (mg/m3) - Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-05 (mg/m3) - Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 3.0E-04 (mg/m3) - Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 0.0E+00 (mg/m3) 9.0E-05 (mg/m3) - Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-02 (mg/m3) - Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-04 (mg/m3) - Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) - Exp. Route Total 4.4E-05 3.9 Exposure Point Total 4.4E-05 3.9 Exposure Medium Total 4.4E-05 3.9 Medium Total 2.3E-04 23 ------- TABLE 7.8.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 4 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient I | Value Units Value Units Value Units Value Units Sediment Sediment OWR I Ingestion j Cobalt 14 mg/kg 7.1E-07 (mg/kg/day) NA (mg/kg/day)"1 2.5E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.008 [Nickel 1500 mg/kg 7.6E-05 (mg/kg/day) NA (mg/kg/day)"1 2.7E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.013 | Exp. Route Total jj 0.022 | Dermal [Cobalt 14 mg/kg 3.0E-08 (mg/kg/day) NA (mg/kg/day)"1 1.1E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000 [Nickel 1500 mg/kg 3.2E-06 (mg/kg/day) NA (mg/kg/day)"1 1.1E-05 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.014 |j Exp. Route Total |f 0.014 Exposure Point Total 0.036 Exposure Medium Total 0.036 Medium Total 0.036 Total of Receptor Risks Across All Media 2.3E-04 Total of Receptor Hazards Across All Media 23 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.9.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 1.6E-06 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.6E-06 Naphthalene 9.8 mg/kg 1.4E-05 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 1.6E-07 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.5E-06 Aluminum 9940 mg/kg 1.4E-02 (mg/kg/day) NA (mg/kg/day)" Antimony 6.48 mg/kg 9.3E-06 (mg/kg/day) NA (mg/kg/day)" Arsenic 3.95 mg/kg 3.4E-06 (mg/kg/day) 1.5E+00 (mg/kg/day)" 5.1E-06 Cobalt 6.32 mg/kg 9.1E-06 (mg/kg/day) NA (mg/kg/day)" Copper 660 mg/kg 9.5E-04 (mg/kg/day) NA (mg/kg/day)" Iron 19200 mg/kg 2.8E-02 (mg/kg/day) NA (mg/kg/day)" Lead 71.4 mg/kg 1.0E-04 (mg/kg/day) NA (mg/kg/day)" Manganese 388 mg/kg 5.6E-04 (mg/kg/day) NA (mg/kg/day)" Thallium 2.13 mg/kg 3.1E-06 (mg/kg/day) NA (mg/kg/day)" Vanadium 23.6 mg/kg 3.4E-05 (mg/kg/day) NA (mg/kg/day)" Zinc 380 mg/kg 5.5E-04 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 9.3E-06 Dermal Benzo(a)pyrene 0.252 mg/kg 5.5E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 5.5E-07 Naphthalene 9.8 mg/kg 5.2E-06 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 4.5E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 7.1E-07 Aluminum 9940 mg/kg 4.0E-04 (mg/kg/day) NA (mg/kg/day)" Antimony 6.48 mg/kg 2.6E-07 (mg/kg/day) NA (mg/kg/day)" Arsenic 3.95 mg/kg 4.8E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 7.2E-07 Cobalt 6.32 mg/kg 2.6E-07 (mg/kg/day) NA (mg/kg/day)" Copper 660 mg/kg 2.7E-05 (mg/kg/day) NA (mg/kg/day)" Iron 19200 mg/kg 7.8E-04 (mg/kg/day) NA (mg/kg/day)" Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" Manganese 388 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" Thallium 2.13 mg/kg 8.6E-08 (mg/kg/day) NA (mg/kg/day)" Vanadium 23.6 mg/kg 9.5E-07 (mg/kg/day) NA (mg/kg/day)" Zinc 380 mg/kg 1.5E-05 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 2.0E-06 Exposure Point Total 1.1E-05 Exposure Medium Total 1.1E-05 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 7.7E-11 (mg/m3) 6.0E-04 (ug/m3)"1 4.6E-11 Naphthalene 1.7E-04 mg/m3 5.9E-05 (mg/m3) 3.4E-05 (ug/m3)"1 2.0E-06 Dieldrin 3.4E-11 mg/m3 1.2E-11 (mg/m3) 4.6E-03 (ug/m3)"1 5.6E-11 Aluminum 3.1E-06 mg/m3 1.1E-06 (mg/m3) NA (ug/m3)"1 Antimony 2.0E-09 mg/m3 7.1E-10 (mg/m3) NA (ug/m3)"1 Arsenic 1.2E-09 mg/m3 4.3E-10 (mg/m3) 4.3E-03 (ug/m3)"1 1.9E-09 Cobalt 2.0E-09 mg/m3 6.9E-10 (mg/m3) 9.0E-03 (ug/m3)"1 6.3E-09 Copper 2.0E-07 mg/m3 7.3E-08 (mg/m3) NA (ug/m3)"1 Iron 5.9E-06 mg/m3 2.1E-06 (mg/m3) NA (ug/m3)"1 Lead 2.2E-08 mg/m3 7.8E-09 (mg/m3) NA (ug/m3)"1 Manganese 1.2E-07 mg/m3 4.3E-08 (mg/m3) NA (ug/m3)"1 Thallium 6.6E-10 mg/m3 2.3E-10 (mg/m3) NA (ug/m3)"1 Vanadium 7.3E-09 mg/m3 2.6E-09 (mg/m3) NA (ug/m3)"1 Zinc 1.2E-07 mg/m3 4.2E-08 (mg/m3) NA (ug/m3)"1 Exp. Route Total 2.0E-06 Exposure Point Total 2.0E-06 Exposure Medium Total 2.0E-06 Medium Total 1.3E-05 ------- TABLE 7.9.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 2-Hexanone 1300 41 ug/L ug/L 1.7E-02 5.3E-04 (mg/kg/day) (mg/kg/day) NA NA (mg/kg/day)" (mg/kg/day)" Chloroform 9.4 ug/L 1.2E-04 (mg/kg/day) 3.1E-02 (mg/kg/day)" 3.7E-06 cis-1,2-Dichloroethene 1.88 ug/L 2.4E-05 (mg/kg/day) NA (mg/kg/day)" Methyl Tert-Butyl Ether 15 ug/L 1.9E-04 (mg/kg/day) 1.8E-03 (mg/kg/day)" 3.5E-07 Tetrachloroethene 65.7 ug/L 8.4E-04 (mg/kg/day) 2.1E-03 (mg/kg/day)" 1.8E-06 Trichloroethene (Mutagenic) 10.6 ug/L 4.2E-04 (mg/kg/day) 9.3E-03 (mg/kg/day)" 3.9E-06 Trichloroethene (Nonmutagenic 10.6 ug/L 1.4E-04 (mg/kg/day) 3.7E-02 (mg/kg/day)" 5.0E-06 Vinyl Chloride 0.57 ug/L 3.7E-05 (mg/kg/day) 7.2E-01 (mg/kg/day)" 2.7E-05 1,4-Dioxane 3.84 ug/L 4.9E-05 (mg/kg/day) 1.0E-01 (mg/kg/day)" 4.9E-06 Bis(2-ethylhexyl)phthalate 11 ug/L 1.4E-04 (mg/kg/day) 1.4E-02 (mg/kg/day)" 2.0E-06 Caprolactam 2800 ug/L 3.6E-02 (mg/kg/day) NA (mg/kg/day)" Aluminum 57655 ug/L 7.4E-01 (mg/kg/day) NA (mg/kg/day)" Antimony 1.31 ug/L 1.7E-05 (mg/kg/day) NA (mg/kg/day)" Arsenic 12.8 ug/L 1.6E-04 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.5E-04 Barium 674 ug/L 8.7E-03 (mg/kg/day) NA (mg/kg/day)" Beryllium 3.46 ug/L 4.4E-05 (mg/kg/day) NA (mg/kg/day)" Cadmium 0.424 ug/L 5.4E-06 (mg/kg/day) NA (mg/kg/day)" Cobalt 63.9 ug/L 8.2E-04 (mg/kg/day) NA (mg/kg/day)" Copper 75.2 ug/L 9.7E-04 (mg/kg/day) NA (mg/kg/day)" Iron 45400 ug/L 5.8E-01 (mg/kg/day) NA (mg/kg/day)" Lead 23.1 ug/L 3.0E-04 (mg/kg/day) NA (mg/kg/day)" Manganese 2525 ug/L 3.2E-02 (mg/kg/day) NA (mg/kg/day)" Mercury 0.128 ug/L 1.6E-06 (mg/kg/day) NA (mg/kg/day)" Nickel 51.7 ug/L 6.6E-04 (mg/kg/day) NA (mg/kg/day)" Selenium 3.1 ug/L 4.0E-05 (mg/kg/day) NA (mg/kg/day)" Thallium 0.539 ug/L 6.9E-06 (mg/kg/day) NA (mg/kg/day)" Vanadium 12.3 ug/L 1.6E-04 (mg/kg/day) NA (mg/kg/day)" Zinc 378 ug/L 4.9E-03 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 2.9E-04 Dermal 2-Butanone 2-Hexanone 1300 41 ug/L ug/L 1.4E-04 1.8E-05 (mg/kg/day) (mg/kg/day) NA NA (mg/kg/day)" (mg/kg/day)" Chloroform 9.4 ug/L 7.4E-06 (mg/kg/day) 3.1E-02 (mg/kg/day)" 2.3E-07 cis-1,2-Dichloroethene 1.88 ug/L 2.0E-06 (mg/kg/day) NA (mg/kg/day)" Methyl Tert-Butyl Ether 15 ug/L 3.1E-06 (mg/kg/day) 1.8E-03 (mg/kg/day)" 5.6E-09 Tetrachloroethene 65.7 ug/L 3.5E-04 (mg/kg/day) 2.1E-03 (mg/kg/day)" 7.4E-07 Trichloroethene (Mutagenic) 10.6 ug/L 5.3E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 4.9E-07 Trichloroethene (Nonmutagenic 10.6 ug/L 1.5E-05 (mg/kg/day) 3.7E-02 (mg/kg/day)" 5.7E-07 Vinyl Chloride 0.57 ug/L 2.3E-06 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.7E-06 1,4-Dioxane 3.84 ug/L 1.6E-07 (mg/kg/day) 1.0E-01 (mg/kg/day)" 1.6E-08 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" Caprolactam 2800 ug/L 4.3E-04 (mg/kg/day) NA (mg/kg/day)" Aluminum 57655 ug/L 3.8E-03 (mg/kg/day) NA (mg/kg/day)" Antimony 1.31 ug/L 8.7E-08 (mg/kg/day) NA (mg/kg/day)" Arsenic 12.8 ug/L 8.5E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.3E-06 Barium 674 ug/L 4.5E-05 (mg/kg/day) NA (mg/kg/day)" Beryllium 3.46 ug/L 2.3E-07 (mg/kg/day) NA (mg/kg/day)" Cadmium 0.424 ug/L 2.8E-08 (mg/kg/day) NA (mg/kg/day)" Cobalt 63.9 ug/L 1.7E-06 (mg/kg/day) NA (mg/kg/day)" Copper 75.2 ug/L 5.0E-06 (mg/kg/day) NA (mg/kg/day)" Iron 45400 ug/L 3.0E-03 (mg/kg/day) NA (mg/kg/day)" Lead 23.1 ug/L 1.5E-07 (mg/kg/day) NA (mg/kg/day)" Manganese 2525 ug/L 1.7E-04 (mg/kg/day) NA (mq/kq/dav) Groundwater Groundwater ------- TABLE 7.9.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Mercury 0.128 ug/L 8.5E-09 (mg/kg/day) NA (mg/kg/day)" Nickel 51.7 ug/L 6.9E-07 (mg/kg/day) NA (mg/kg/day)" Selenium 3.1 ug/L 2.1E-07 (mg/kg/day) NA (mg/kg/day)" Thallium 0.539 ug/L 3.6E-08 (mg/kg/day) NA (mg/kg/day)" Vanadium 12.3 ug/L 8.2E-07 (mg/kg/day) NA (mg/kg/day)" Zinc 378 ug/L 1.5E-05 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 5.0E-06 Exposure Point Total 3.0E-04 Exposure Medium Total 3.0E-04 Air OWR Inhalation 2-Butanone 2.2E-01 mg/m3 6.0E-02 (mg/m3) NA (ug/m3)"1 2-Hexanone 8.4E-03 mg/m3 2.3E-03 (mg/m3) NA (ug/m3)"1 Chloroform 5.2E-03 mg/m3 1.4E-03 (mg/m3) 2.3E-05 (ug/m3)"1 3.3E-05 cis-1,2-Dichloroethene 1.1E-03 mg/m3 3.1E-04 (mg/m3) NA (ug/m3)"1 Methyl Tert-Butyl Ether 7.4E-03 mg/m3 2.0E-03 (mg/m3) 2.6E-07 (ug/m3)"1 5.3E-07 Tetrachloroethene 3.3E-02 mg/m3 9.1E-03 (mg/m3) 2.6E-07 (ug/m3)"1 2.4E-06 Trichloroethene (Mutagenic) 5.8E-03 mg/m3 3.2E-03 (mg/m3) 1.0E-06 (ug/m3)"1 3.2E-06 Trichloroethene (Nonmutagenic 5.8E-03 mg/m3 1.6E-03 (mg/m3) 3.1E-06 (ug/m3)"1 4.9E-06 Vinyl Chloride 4.1E-04 mg/m3 1.1E-04 (mg/m3) 4.4E-06 (ug/m3)"1 5.0E-07 1,4-Dioxane 6.3E-05 mg/m3 1.7E-05 (mg/m3) 5.0E-06 (ug/m3)"1 8.6E-08 Bis(2-ethylhexyl)phthalate 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-06 (ug/m3)"1 Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Exp. Route Total 4.4E-05 Exposure Point Total 4.4E-05 Exposure Medium Total 4.4E-05 Medium Total 3.4E-04 ------- TABLE 7.9.RME CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 4 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 3.0E-06 (mg/kg/day) NA (mg/kg/day)"1 [Nickel 1500 mg/kg 3.2E-04 (mg/kg/day) NA (mg/kg/day)"1 I Exp. Route Total | Dermal jCobalt 14 mg/kg 8.4E-08 (mg/kg/day) NA (mg/kg/day)"1 | Nickel 1500 mg/kg 9.0E-06 (mg/kg/day) NA (mg/kg/day)"1 Exp. Route Total jj Exposure Point Total Exposure Medium Total Medium Total Total of Receptor Risks Across All Media 3.6E-04 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.1 .CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Industrial Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 1.1E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.1E-08 1.1E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00036 Naphthalene 9.8 mg/kg 3.7E-07 (mg/kg/day) NA (mg/kg/day)" 3.7E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00018 Dieldrin 0.11 mg/kg 4.1E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 6.6E-08 4.1E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00083 Aluminum 12000 mg/kg 4.5E-04 (mg/kg/day) NA (mg/kg/day)" 4.5E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0045 Antimony 11.3 mg/kg 4.2E-07 (mg/kg/day) NA (mg/kg/day)" 4.2E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.011 Arsenic 5.28 mg/kg 1.2E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.8E-07 1.2E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0040 Cobalt 7.59 mg/kg 2.8E-07 (mg/kg/day) NA (mg/kg/day)" 2.8E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0095 Copper 1240 mg/kg 4.7E-05 (mg/kg/day) NA (mg/kg/day)" 4.7E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.012 Iron 20200 mg/kg 7.6E-04 (mg/kg/day) NA (mg/kg/day)" 7.6E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.011 Lead 131 mg/kg 4.9E-06 (mg/kg/day) NA (mg/kg/day)" 4.9E-05 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 1.7E-05 (mg/kg/day) NA (mg/kg/day)" 1.7E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.0071 Vanadium 27 mg/kg 1.0E-06 (mg/kg/day) NA (mg/kg/day)" 1.0E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0020 Zinc 705 mg/kg 2.6E-05 (mg/kg/day) NA (mg/kg/day)" 2.6E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00088 Exp. Route Total 2.5E-07 0.062 Dermal Benzo(a)pyrene 0.286 mg/kg 2.0E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.0E-09 2.0E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000066 Naphthalene 9.8 mg/kg 6.7E-08 (mg/kg/day) NA (mg/kg/day)" 6.7E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000034 Dieldrin 0.11 mg/kg 5.8E-10 (mg/kg/day) 1.6E+01 (mg/kg/day)" 9.3E-09 5.8E-09 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00012 Aluminum 12000 mg/kg 6.3E-06 (mg/kg/day) NA (mg/kg/day)" 6.3E-05 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.000063 Antimony 11.3 mg/kg 6.0E-09 (mg/kg/day) NA (mg/kg/day)" 6.0E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00100 Arsenic 5.28 mg/kg 8.4E-09 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.3E-08 8.4E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00028 Cobalt 7.59 mg/kg 4.0E-09 (mg/kg/day) NA (mg/kg/day)" 4.0E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00013 Copper 1240 mg/kg 6.6E-07 (mg/kg/day) NA (mg/kg/day)" 6.6E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00016 Iron 20200 mg/kg 1.1E-05 (mg/kg/day) NA (mg/kg/day)" 1.1E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00015 Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 2.4E-07 (mg/kg/day) NA (mg/kg/day)" 2.4E-06 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.0025 Vanadium 27 mg/kg 1.4E-08 (mg/kg/day) NA (mg/kg/day)" 1.4E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0011 Zinc 705 mg/kg 3.7E-07 (mg/kg/day) NA (mg/kg/day)" 3.7E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000012 Exp. Route Total 2.4E-08 0.0056 Exposure Point Total 2.8E-07 0.068 Exposure Medium Total 2.8E-07 0.068 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 1.8E-12 (mg/m3) 6.0E-04 (ug/m3)"1 1.1E-12 1.8E-11 (mg/m3) 2.0E-06 (mg/m3) 0.0000088 Naphthalene 1.7E-04 mg/m3 3.3E-06 (mg/m3) 3.4E-05 (ug/m3)"1 1.1E-07 3.3E-05 (mg/m3) 3.0E-03 (mg/m3) 0.011 Dieldrin 3.4E-11 mg/m3 6.8E-13 (mg/m3) 4.6E-03 (ug/m3)"1 3.1E-12 6.8E-12 (mg/m3) NA (mg/m3) Aluminum 3.7E-06 mg/m 7.4E-08 (mg/m3) NA (ug/m3)"1 7.4E-07 (mg/m3) 5.0E-03 (mg/m3) 0.00015 Antimony 3.5E-09 mg/m3 7.0E-11 (mg/m3) NA (ug/m3)"1 7.0E-10 (mg/m3) NA (mg/m3) Arsenic 1.6E-09 mg/m3 3.3E-11 (mg/m3) 4.3E-03 (ug/m3)"1 1.4E-10 3.3E-10 (mg/m3) 1.5E-05 (mg/m3) 0.000022 Cobalt 2.3E-09 mg/m3 4.7E-11 (mg/m3) 9.0E-03 (ug/m3)"1 4.2E-10 4.7E-10 (mg/m3) 6.0E-06 (mg/m3) 0.000078 Copper 3.8E-07 mg/m3 7.7E-09 (mg/m3) NA (ug/m3)"1 7.7E-08 (mg/m3) NA (mg/m3) Iron 6.2E-06 mg/m3 1.2E-07 (mg/m3) NA (ug/m3)"1 1.2E-06 (mg/m3) NA (mg/m3) Lead 4.0E-08 mg/m3 8.1E-10 (mg/m3) NA (ug/m3)"1 8.1E-09 (mg/m3) NA (mg/m3) Manganese 1.4E-07 mg/m3 2.8E-09 (mg/m3) NA (ug/m3)"1 2.8E-08 (mg/m3) 5.0E-05 (mg/m3) 0.00056 Vanadium 8.3E-09 mg/m3 1.7E-10 (mg/m3) NA (ug/m3)"1 1.7E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000017 Zinc 2.2E-07 mg/m3 4.4E-09 (mg/m3) NA (ug/m3)"1 4.4E-08 (mg/m3) NA (mg/m3) Exp. Route Total 1.1E-07 0.012 Exposure Point Total 1.1E-07 0.012 Exposure Medium Total 1.1E-07 0.012 Medium Total 3.9E-07 0.080 Total of Receptor Risks Across All Media 3.9E-07 Total of Receptor Hazards Across All Media 0.080 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.2.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 2.3E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.3E-07 1.2E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0041 Naphthalene 9.8 mg/kg 1.2E-06 (mg/kg/day) NA (mg/kg/day)" 4.2E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0021 Dieldrin 0.11 mg/kg 1.3E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.1E-07 4.7E-07 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0094 Aluminum 12000 mg/kg 1.5E-03 (mg/kg/day) NA (mg/kg/day)" 5.1E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.051 Antimony 11.3 mg/kg 1.4E-06 (mg/kg/day) NA (mg/kg/day)" 4.8E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.12 Arsenic 5.28 mg/kg 3.9E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 5.8E-07 1.4E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.045 Cobalt 7.59 mg/kg 9.3E-07 (mg/kg/day) NA (mg/kg/day)" 3.2E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.11 Copper 1240 mg/kg 1.5E-04 (mg/kg/day) NA (mg/kg/day)" 5.3E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.13 Iron 20200 mg/kg 2.5E-03 (mg/kg/day) NA (mg/kg/day)" 8.6E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.12 Lead 131 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" 5.6E-04 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 5.6E-05 (mg/kg/day) NA (mg/kg/day)" 1.9E-03 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.081 Vanadium 27 mg/kg 3.3E-06 (mg/kg/day) NA (mg/kg/day)" 1.2E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.023 Zinc 705 mg/kg 8.6E-05 (mg/kg/day) NA (mg/kg/day)" 3.0E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.010 Exp. Route Total 1.0E-06 0.71 Dermal Benzo(a)pyrene 0.286 mg/kg 2.8E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.8E-08 1.5E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00050 Naphthalene 9.8 mg/kg 1.5E-07 (mg/kg/day) NA (mg/kg/day)" 5.2E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00026 Dieldrin 0.11 mg/kg 1.3E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.0E-08 4.5E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00089 Aluminum 12000 mg/kg 1.4E-05 (mg/kg/day) NA (mg/kg/day)" 4.9E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00049 Antimony 11.3 mg/kg 1.3E-08 (mg/kg/day) NA (mg/kg/day)" 4.6E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0076 Arsenic 5.28 mg/kg 1.8E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.8E-08 6.4E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0021 Cobalt 7.59 mg/kg 8.8E-09 (mg/kg/day) NA (mg/kg/day)" 3.1E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0010 Copper 1240 mg/kg 1.4E-06 (mg/kg/day) NA (mg/kg/day)" 5.0E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0013 Iron 20200 mg/kg 2.3E-05 (mg/kg/day) NA (mg/kg/day)" 8.2E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0012 Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 5.3E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.019 Vanadium 27 mg/kg 3.1E-08 (mg/kg/day) NA (mg/kg/day)" 1.1E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0084 Zinc 705 mg/kg 8.2E-07 (mg/kg/day) NA (mg/kg/day)" 2.9E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000095 Exp. Route Total 7.6E-08 0.043 Exposure Point Total 1.1E-06 0.75 Exposure Medium Total 1.1E-06 0.75 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 1.1E-11 (mg/m3) 6.0E-04 (ug/m3)"1 6.3E-12 5.7E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000028 Naphthalene 1.7E-04 mg/m3 3.0E-06 (mg/m3) 3.4E-05 (ug/m3)"1 1.0E-07 1.1E-04 (mg/m3) 3.0E-03 (mg/m3) 0.035 Dieldrin 3.4E-11 mg/m3 6.2E-13 (mg/m3) 4.6E-03 (ug/m3)"1 2.9E-12 2.2E-11 (mg/m3) NA (mg/m3) Aluminum 3.7E-06 mg/m 6.8E-08 (mg/m3) NA (ug/m3)"1 2.4E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00047 Antimony 3.5E-09 mg/m3 6.4E-11 (mg/m3) NA (ug/m3)"1 2.2E-09 (mg/m3) NA (mg/m3) Arsenic 1.6E-09 mg/m3 3.0E-11 (mg/m3) 4.3E-03 (ug/m3)"1 1.3E-10 1.0E-09 (mg/m3) 1.5E-05 (mg/m3) 0.000070 Cobalt 2.3E-09 mg/m3 4.3E-11 (mg/m3) 9.0E-03 (ug/m3)"1 3.9E-10 1.5E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00025 Copper 3.8E-07 mg/m3 7.0E-09 (mg/m3) NA (ug/m3)"1 2.5E-07 (mg/m3) NA (mg/m3) Iron 6.2E-06 mg/m3 1.1E-07 (mg/m3) NA (ug/m3)"1 4.0E-06 (mg/m3) NA (mg/m3) Lead 4.0E-08 mg/m3 7.4E-10 (mg/m3) NA (ug/m3)"1 2.6E-08 (mg/m3) NA (mg/m3) Manganese 1.4E-07 mg/m3 2.6E-09 (mg/m3) NA (ug/m3)"1 9.0E-08 (mg/m3) 5.0E-05 (mg/m3) 0.0018 Vanadium 8.3E-09 mg/m3 1.5E-10 (mg/m3) NA (ug/m3)"1 5.3E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000053 Zinc 2.2E-07 mg/m3 4.0E-09 (mg/m3) NA (ug/m3)"1 1.4E-07 (mg/m3) NA (mg/m3) Exp. Route Total 1.0E-07 0.038 Exposure Point Total 1.0E-07 0.038 Exposure Medium Total 1.0E-07 0.038 Medium Total 1.2E-06 0.79 ------- TABLE 7.2.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 1.9E-07 (mg/kg/day) NA (mg/kg/day)"1 6.6E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.022 [Nickel 1500 mg/kg 2.0E-05 (mg/kg/day) NA (mg/kg/day)"1 7.1E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.036 I Exp. Route Total | 0.058 Dermal jCobalt 14 mg/kg 1.8E-09 (mg/kg/day) NA (mg/kg/day)"1 6.3E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000 | Nickel 1500 mg/kg 1.9E-07 (mg/kg/day) NA (mg/kg/day)"1 6.8E-06 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0085 Exp. Route Total jj 0.009 Exposure Point Total 0.07 Exposure Medium Total 0.07 Medium Total 0.07 Total of Receptor Risks Across All Media 1.2E-06 Total of Receptor Hazards Across All Media 0.86 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.3.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 1.8E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.8E-08 1.1E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00038 Naphthalene 9.8 mg/kg 3.9E-07 (mg/kg/day) NA (mg/kg/day)" 3.9E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00020 Dieldrin 0.11 mg/kg 4.4E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 7.1E-08 4.4E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00088 Aluminum 12000 mg/kg 4.8E-04 (mg/kg/day) NA (mg/kg/day)" 4.8E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0048 Antimony 11.3 mg/kg 4.5E-07 (mg/kg/day) NA (mg/kg/day)" 4.5E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.011 Arsenic 5.28 mg/kg 1.3E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.9E-07 1.3E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0042 Cobalt 7.59 mg/kg 3.0E-07 (mg/kg/day) NA (mg/kg/day)" 3.0E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.010 Copper 1240 mg/kg 5.0E-05 (mg/kg/day) NA (mg/kg/day)" 5.0E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.012 Iron 20200 mg/kg 8.1E-04 (mg/kg/day) NA (mg/kg/day)" 8.1E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.012 Lead 131 mg/kg 5.2E-06 (mg/kg/day) NA (mg/kg/day)" 5.2E-05 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 1.8E-05 (mg/kg/day) NA (mg/kg/day)" 1.8E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.0076 Vanadium 27 mg/kg 1.1E-06 (mg/kg/day) NA (mg/kg/day)" 1.1E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0022 Zinc 705 mg/kg 2.8E-05 (mg/kg/day) NA (mg/kg/day)" 2.8E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00094 Exp. Route Total 2.8E-07 0.067 Dermal Benzo(a)pyrene 0.286 mg/kg 2.8E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.8E-09 1.8E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000060 Naphthalene 9.8 mg/kg 6.2E-08 (mg/kg/day) NA (mg/kg/day)" 6.2E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000031 Dieldrin 0.11 mg/kg 5.3E-10 (mg/kg/day) 1.6E+01 (mg/kg/day)" 8.5E-09 5.3E-09 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00011 Aluminum 12000 mg/kg 5.8E-06 (mg/kg/day) NA (mg/kg/day)" 5.8E-05 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.000058 Antimony 11.3 mg/kg 5.5E-09 (mg/kg/day) NA (mg/kg/day)" 5.5E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00091 Arsenic 5.28 mg/kg 7.7E-09 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.1E-08 7.7E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00026 Cobalt 7.59 mg/kg 3.7E-09 (mg/kg/day) NA (mg/kg/day)" 3.7E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00012 Copper 1240 mg/kg 6.0E-07 (mg/kg/day) NA (mg/kg/day)" 6.0E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00015 Iron 20200 mg/kg 9.8E-06 (mg/kg/day) NA (mg/kg/day)" 9.8E-05 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00014 Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 456 mg/kg 2.2E-07 (mg/kg/day) NA (mg/kg/day)" 2.2E-06 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.0023 Vanadium 27 mg/kg 1.3E-08 (mg/kg/day) NA (mg/kg/day)" 1.3E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0010 Zinc 705 mg/kg 3.4E-07 (mg/kg/day) NA (mg/kg/day)" 3.4E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000011 Exp. Route Total 2.3E-08 0.0051 Exposure Point Total 3.0E-07 0.072 Exposure Medium Total 3.0E-07 0.072 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 8.9E-12 (mg/m3) 6.0E-04 (ug/m3)"1 5.3E-12 5.7E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000028 Naphthalene 1.7E-04 mg/m3 1.1E-05 (mg/m3) 3.4E-05 (ug/m3)"1 3.6E-07 1.1E-04 (mg/m3) 3.0E-03 (mg/m3) 0.035 Dieldrin 3.4E-11 mg/m3 2.2E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.0E-11 2.2E-11 (mg/m3) NA (mg/m3) Aluminum 3.7E-06 mg/m 2.4E-07 (mg/m3) NA (ug/m3)"1 2.4E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00047 Antimony 3.5E-09 mg/m3 2.2E-10 (mg/m3) NA (ug/m3)"1 2.2E-09 (mg/m3) NA (mg/m3) Arsenic 1.6E-09 mg/m3 1.0E-10 (mg/m3) 4.3E-03 (ug/m3)"1 4.5E-10 1.0E-09 (mg/m3) 1.5E-05 (mg/m3) 0.000070 Cobalt 2.3E-09 mg/m3 1.5E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.4E-09 1.5E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00025 Copper 3.8E-07 mg/m3 2.5E-08 (mg/m3) NA (ug/m3)"1 2.5E-07 (mg/m3) NA (mg/m3) Iron 6.2E-06 mg/m3 4.0E-07 (mg/m3) NA (ug/m3)"1 4.0E-06 (mg/m3) NA (mg/m3) Lead 4.0E-08 mg/m3 2.6E-09 (mg/m3) NA (ug/m3)"1 2.6E-08 (mg/m3) NA (mg/m3) Manganese 1.4E-07 mg/m3 9.0E-09 (mg/m3) NA (ug/m3)"1 9.0E-08 (mg/m3) 5.0E-05 (mg/m3) 0.0018 Vanadium 8.3E-09 mg/m3 5.3E-10 (mg/m3) NA (ug/m3)"1 5.3E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000053 Zinc 2.2E-07 mg/m3 1.4E-08 (mg/m3) NA (ug/m3)"1 1.4E-07 (mg/m3) NA (mg/m3) Exp. Route Total 3.6E-07 0.038 Exposure Point Total 3.6E-07 0.038 Exposure Medium Total 3.6E-07 0.038 Medium Total 6.6E-07 0.11 ------- TABLE 7.3.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 6.2E-08 (mg/kg/day) NA (mg/kg/day)"1 6.2E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0021 [Nickel 1500 mg/kg 6.7E-06 (mg/kg/day) NA (mg/kg/day)"1 6.7E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0033 I Exp. Route Total | 0.0054 Dermal jCobalt 14 mg/kg 7.5E-10 (mg/kg/day) NA (mg/kg/day)"1 7.5E-09 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0000 | Nickel 1500 mg/kg 8.1E-08 (mg/kg/day) NA (mg/kg/day)"1 8.1E-07 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0010 Exp. Route Total jj 0.0010 Exposure Point Total 0.006 Exposure Medium Total 0.006 Medium Total 0.006 Total of Receptor Risks Across All Media 6.6E-07 Total of Receptor Hazards Across All Media 0.12 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.4.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface Soil Surface Soil OWR Ingestion Benzo(a)pyrene 0.286 mg/kg 2.5E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.5E-07 See Tables 7.2.CTE and 7.3.CTE for Hazard Indices Naphthalene 9.8 mg/kg 1.6E-06 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 1.8E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.9E-07 Aluminum 12000 mg/kg 1.9E-03 (mg/kg/day) NA (mg/kg/day)" Antimony 11.3 mg/kg 1.8E-06 (mg/kg/day) NA (mg/kg/day)" Arsenic 5.28 mg/kg 5.1E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 7.7E-07 Cobalt 7.59 mg/kg 1.2E-06 (mg/kg/day) NA (mg/kg/day)" Copper 1240 mg/kg 2.0E-04 (mg/kg/day) NA (mg/kg/day)" Iron 20200 mg/kg 3.3E-03 (mg/kg/day) NA (mg/kg/day)" Lead 131 mg/kg 2.1E-05 (mg/kg/day) NA (mg/kg/day)" Manganese 456 mg/kg 7.4E-05 (mg/kg/day) NA (mg/kg/day)" Vanadium 27 mg/kg 4.4E-06 (mg/kg/day) NA (mg/kg/day)" Zinc 705 mg/kg 1.1E-04 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 1.3E-06 Dermal Benzo(a)pyrene 0.286 mg/kg 3.1E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 3.1E-08 Naphthalene 9.8 mg/kg 2.1E-07 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 1.8E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.9E-08 Aluminum 12000 mg/kg 2.0E-05 (mg/kg/day) NA (mg/kg/day)" Antimony 11.3 mg/kg 1.9E-08 (mg/kg/day) NA (mg/kg/day)" Arsenic 5.28 mg/kg 2.6E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.9E-08 Cobalt 7.59 mg/kg 1.2E-08 (mg/kg/day) NA (mg/kg/day)" Copper 1240 mg/kg 2.0E-06 (mg/kg/day) NA (mg/kg/day)" Iron 20200 mg/kg 3.3E-05 (mg/kg/day) NA (mg/kg/day)" Lead 131 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" Manganese 456 mg/kg 7.5E-07 (mg/kg/day) NA (mg/kg/day)" Vanadium 27 mg/kg 4.4E-08 (mg/kg/day) NA (mg/kg/day)" Zinc 705 mg/kg 1.2E-06 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 9.9E-08 Exposure Point Total 1.4E-06 Exposure Medium Total 1.4E-06 Air OWR Inhalation Benzo(a)pyrene 8.8E-11 mg/m3 1.9E-11 (mg/m3) 6.0E-04 (ug/m3)"1 1.2E-11 Naphthalene 1.7E-04 mg/m3 1.4E-05 (mg/m3) 3.4E-05 (ug/m3)"1 4.6E-07 Dieldrin 3.4E-11 mg/m3 2.8E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.3E-11 Aluminum 3.7E-06 mg/m3 3.1E-07 (mg/m3) NA (ug/m3)"1 Antimony 3.5E-09 mg/m3 2.9E-10 (mg/m3) NA (ug/m3)"1 Arsenic 1.6E-09 mg/m3 1.3E-10 (mg/m3) 4.3E-03 (ug/m3)"1 5.8E-10 Cobalt 2.3E-09 mg/m3 1.9E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.7E-09 Copper 3.8E-07 mg/m3 3.2E-08 (mg/m3) NA (ug/m3)"1 Iron 6.2E-06 mg/m3 5.1E-07 (mg/m3) NA (ug/m3)"1 Lead 4.0E-08 mg/m3 3.3E-09 (mg/m3) NA (ug/m3)"1 Manganese 1.4E-07 mg/m3 1.2E-08 (mg/m3) NA (ug/m3)"1 Vanadium 8.3E-09 mg/m3 6.9E-10 (mg/m3) NA (ug/m3)"1 Zinc 2.2E-07 mg/m3 1.8E-08 (mg/m3) NA (ug/m3)"1 Exp. Route Total 4.6E-07 Exposure Point Total 4.6E-07 Exposure Medium Total 4.6E-07 Medium Total 1.9E-06 ------- TABLE 7.4.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 2.5E-07 (mg/kg/day) NA (mg/kg/day)"1 [Nickel 1500 mg/kg 2.7E-05 (mg/kg/day) NA (mg/kg/day)"1 I Exp. Route Total | Dermal jCobalt 14 mg/kg 2.6E-09 (mg/kg/day) NA (mg/kg/day)"1 | Nickel 1500 mg/kg 2.7E-07 (mg/kg/day) NA (mg/kg/day)"1 Exp. Route Total jj Exposure Point Total Exposure Medium Total Medium Total Total of Receptor Risks Across All Media 1.9E-06 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.5.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 2.5E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.5E-09 1.8E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00059 Naphthalene 9.8 mg/kg 9.9E-08 (mg/kg/day) NA (mg/kg/day)" 6.9E-06 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.000012 Dieldrin 0.11 mg/kg 1.1E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 1.8E-08 7.8E-08 (mg/kg/day) 1.0E-04 (mg/kg/day) 0.00078 Aluminum 9940 mg/kg 1.0E-04 (mg/kg/day) NA (mg/kg/day)" 7.0E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0070 Antimony 6.48 mg/kg 6.5E-08 (mg/kg/day) NA (mg/kg/day)" 4.6E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.011 Arsenic 3.95 mg/kg 2.4E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.6E-08 1.7E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0056 Cobalt 6.32 mg/kg 6.4E-08 (mg/kg/day) NA (mg/kg/day)" 4.5E-06 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.0015 Copper 660 mg/kg 6.7E-06 (mg/kg/day) NA (mg/kg/day)" 4.7E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.012 Iron 19200 mg/kg 1.9E-04 (mg/kg/day) NA (mg/kg/day)" 1.4E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.019 Lead 71.4 mg/kg 7.2E-07 (mg/kg/day) NA (mg/kg/day)" 5.0E-05 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 3.9E-06 (mg/kg/day) NA (mg/kg/day)" 2.7E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.011 Thallium 2.13 mg/kg 2.1E-08 (mg/kg/day) NA (mg/kg/day)" 1.5E-06 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.038 Vanadium 23.6 mg/kg 2.4E-07 (mg/kg/day) NA (mg/kg/day)" 1.7E-05 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.0017 Zinc 380 mg/kg 3.8E-06 (mg/kg/day) NA (mg/kg/day)" 2.7E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00089 Exp. Route Total 5.6E-08 0.11 Dermal Benzo(a)pyrene 0.252 mg/kg 7.1E-10 (mg/kg/day) 1.0E+00 (mg/kg/day)" 7.1E-10 4.9E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00016 Naphthalene 9.8 mg/kg 2.7E-08 (mg/kg/day) NA (mg/kg/day)" 1.9E-06 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.0000032 Dieldrin 0.11 mg/kg 2.4E-10 (mg/kg/day) 1.6E+01 (mg/kg/day)" 3.8E-09 1.7E-08 (mg/kg/day) 1.0E-04 (mg/kg/day) 0.00017 Aluminum 9940 mg/kg 2.1E-06 (mg/kg/day) NA (mg/kg/day)" 1.5E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00015 Antimony 6.48 mg/kg 1.4E-09 (mg/kg/day) NA (mg/kg/day)" 9.8E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0016 Arsenic 3.95 mg/kg 2.6E-09 (mg/kg/day) 1.5E+00 (mg/kg/day)" 3.8E-09 1.8E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00060 Cobalt 6.32 mg/kg 1.4E-09 (mg/kg/day) NA (mg/kg/day)" 9.5E-08 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.000032 Copper 660 mg/kg 1.4E-07 (mg/kg/day) NA (mg/kg/day)" 1.0E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00025 Iron 19200 mg/kg 4.1E-06 (mg/kg/day) NA (mg/kg/day)" 2.9E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00041 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 8.4E-08 (mg/kg/day) NA (mg/kg/day)" 5.9E-06 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.0061 Thallium 2.13 mg/kg 4.6E-10 (mg/kg/day) NA (mg/kg/day)" 3.2E-08 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.00080 Vanadium 23.6 mg/kg 5.1E-09 (mg/kg/day) NA (mg/kg/day)" 3.6E-07 (mg/kg/day) 2.6E-04 (mg/kg/day) 0.0014 Zinc 380 mg/kg 8.2E-08 (mg/kg/day) NA (mg/kg/day)" 5.7E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000019 Exp. Route Total 8.3E-09 0.012 Exposure Point Total 6.5E-08 0.12 Exposure Medium Total 6.5E-08 0.12 Air OWR Inhalation Benzo(a)pyrene 1.8E-07 mg/m3 2.9E-10 (mg/m3) 6.0E-04 (ug/m3)"1 1.8E-10 2.1E-08 (mg/m3) 2.0E-06 (mg/m3) 0.010 Naphthalene 9.6E-04 mg/m3 1.6E-06 (mg/m3) 3.4E-05 (ug/m3)"1 5.3E-08 1.1E-04 (mg/m3) 3.0E-03 (mg/m3) 0.036 Dieldrin 7.9E-08 mg/m3 1.3E-10 (mg/m3) 4.6E-03 (ug/m3)"1 5.9E-10 9.0E-09 (mg/m3) NA (mg/m3) Aluminum 7.1E-03 mg/m3 1.2E-05 (mg/m3) NA (ug/m3)"1 8.1E-04 (mg/m3) 5.0E-03 (mg/m3) 0.16 Antimony 4.6E-06 mg/m3 7.5E-09 (mg/m3) NA (ug/m3)"1 5.3E-07 (mg/m3) NA (mg/m3) Arsenic 2.8E-06 mg/m3 4.6E-09 (mg/m3) 4.3E-03 (ug/m3)"1 2.0E-08 3.2E-07 (mg/m3) 1.5E-05 (mg/m3) 0.021 Cobalt 4.5E-06 mg/m3 7.4E-09 (mg/m3) 9.0E-03 (ug/m3)"1 6.6E-08 5.2E-07 (mg/m3) 2.0E-05 (mg/m3) 0.026 Copper 4.7E-04 mg/m3 7.7E-07 (mg/m3) NA (ug/m3)"1 5.4E-05 (mg/m3) NA (mg/m3) Iron 1.4E-02 mg/m3 2.2E-05 (mg/m3) NA (ug/m3)"1 1.6E-03 (mg/m3) NA (mg/m3) Lead 5.1E-05 mg/m3 8.3E-08 (mg/m3) NA (ug/m3)"1 5.8E-06 (mg/m3) NA (mg/m3) Manganese 2.8E-04 mg/m3 4.5E-07 (mg/m3) NA (ug/m3)"1 3.2E-05 (mg/m3) 5.0E-05 (mg/m3) 0.63 Thallium 1.5E-06 mg/m3 2.5E-09 (mg/m3) NA (ug/m3)"1 1.7E-07 (mg/m3) NA (mg/m3) Vanadium 1.7E-05 mg/m 2.7E-08 (mg/m3) NA (ug/m3)"1 1.9E-06 (mg/m3) 1.0E-04 (mg/m3) 0.019 Zinc 2.7E-04 mg/m3 4.4E-07 (mg/m3) NA (ug/m3)"1 3.1E-05 (mg/m3) NA (mg/m3) Exp. Route Total 1.4E-07 0.91 Exposure Point Total 1.4E-07 0.91 Exposure Medium Total 1.4E-07 0.91 Medium Total 2.0E-07 1.0 ------- TABLE 7.5.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWR Ingestion 2-Butanone 2 ug/L 1.5E-09 (mg/kg/day) NA (mg/kg/day)" 1.0E-07 (mg/kg/day) 2.0E+00 (mg/kg/day) 5.1 E-8 cis-1,2-Dichloroethene 3.1 ug/L 2.3E-09 (mg/kg/day) NA (mg/kg/day)" 1.6E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0000080 Methyl tert-butyl ether 0.95 ug/L 7.0E-10 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.3E-12 4.9E-08 (mg/kg/day) NA (mg/kg/day) Trichloroethene 27 ug/L 2.0E-08 (mg/kg/day) 4.6E-02 (mg/kg/day)" 9.1E-10 1.4E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0028 1,4-Dioxane 3.8 ug/L 2.8E-09 (mg/kg/day) 1.0E-01 (mg/kg/day)" 2.8E-10 2.0E-07 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00000039 Caprolactam 3.7 ug/L 2.7E-09 (mg/kg/day) NA (mg/kg/day)" 1.9E-07 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00000038 Aluminum 114000 ug/L 8.4E-05 (mg/kg/day) NA (mg/kg/day)" 5.9E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0059 Antimony 0.46 ug/L 3.4E-10 (mg/kg/day) NA (mg/kg/day)" 2.4E-08 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.000059 Arsenic 60.1 ug/L 4.4E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 6.6E-08 3.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.010 Barium 3310 ug/L 2.4E-06 (mg/kg/day) NA (mg/kg/day)" 1.7E-04 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.00085 Beryllium 17.8 ug/L 1.3E-08 (mg/kg/day) NA (mg/kg/day)" 9.1E-07 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.00018 Cadmium 0.45 ug/L 3.3E-10 (mg/kg/day) NA (mg/kg/day)" 2.3E-08 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.000046 Cobalt 12.2 ug/L 9.0E-09 (mg/kg/day) NA (mg/kg/day)" 6.3E-07 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.00021 Copper 39.9 ug/L 2.9E-08 (mg/kg/day) NA (mg/kg/day)" 2.0E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000051 Iron 74900 ug/L 5.5E-05 (mg/kg/day) NA (mg/kg/day)" 3.8E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0055 Lead 206 ug/L 1.5E-07 (mg/kg/day) NA (mg/kg/day)" 1.1E-05 (mg/kg/day) NA (mg/kg/day) Manganese 1020 ug/L 7.5E-07 (mg/kg/day) NA (mg/kg/day)" 5.2E-05 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.0022 Mercury 0.091 ug/L 6.7E-11 (mg/kg/day) NA (mg/kg/day)" 4.7E-09 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0000023 Nickel 15.8 ug/L 1.2E-08 (mg/kg/day) NA (mg/kg/day)" 8.1E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000041 Selenium 1.6 ug/L 1.2E-09 (mg/kg/day) NA (mg/kg/day)" 8.2E-08 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.000016 Thallium 2.3 ug/L 1.7E-09 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.0030 Vanadium 30.5 ug/L 2.2E-08 (mg/kg/day) NA (mg/kg/day)" 1.6E-06 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.00016 Zinc 343 ug/L 2.5E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000059 Exp. Route Total 6.7E-08 0.031 Dermal 2-Butanone 2 ug/L 4.5E-10 (mg/kg/day) NA (mg/kg/day)" 3.2E-08 (mg/kg/day) 2.0E+00 (mg/kg/day) 1.6E-8 cis-1,2-Dichloroethene 3.1 ug/L 8.1E-09 (mg/kg/day) NA (mg/kg/day)" 5.7E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000028 Methyl tert-butyl ether 0.95 ug/L 4.8E-10 (mg/kg/day) 1.8E-03 (mg/kg/day)" 8.6E-13 3.4E-08 (mg/kg/day) NA (mg/kg/day) Trichloroethene 27 ug/L 8.1E-08 (mg/kg/day) 4.6E-02 (mg/kg/day)" 3.7E-09 5.7E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.011 1,4-Dioxane 3.8 ug/L 3.0E-10 (mg/kg/day) 1.0E-01 (mg/kg/day)" 3.0E-11 2.1E-08 (mg/kg/day) 5.0E-01 (mg/kg/day) 4.3E-8 Caprolactam 3.7 ug/L 9.4E-10 (mg/kg/day) NA (mg/kg/day)" 6.6E-08 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00000013 Aluminum 114000 ug/L 2.4E-05 (mg/kg/day) NA (mg/kg/day)" 1.7E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0017 Antimony 0.46 ug/L 9.5E-11 (mg/kg/day) NA (mg/kg/day)" 6.7E-09 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00011 Arsenic 60.1 ug/L 1.2E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.9E-08 8.7E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0029 Barium 3310 ug/L 6.9E-07 (mg/kg/day) NA (mg/kg/day)" 4.8E-05 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.0034 Beryllium 17.8 ug/L 3.7E-09 (mg/kg/day) NA (mg/kg/day)" 2.6E-07 (mg/kg/day) 3.5E-05 (mg/kg/day) 0.0074 Cadmium 0.45 ug/L 9.3E-11 (mg/kg/day) NA (mg/kg/day)" 6.5E-09 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.00026 Cobalt 12.2 ug/L 1.0E-09 (mg/kg/day) NA (mg/kg/day)" 7.1E-08 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.000024 Copper 39.9 ug/L 8.3E-09 (mg/kg/day) NA (mg/kg/day)" 5.8E-07 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000014 Iron 74900 ug/L 1.6E-05 (mg/kg/day) NA (mg/kg/day)" 1.1E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0016 Lead 206 ug/L 4.3E-09 (mg/kg/day) NA (mg/kg/day)" 3.0E-07 (mg/kg/day) NA (mg/kg/day) Manganese 1020 ug/L 2.1E-07 (mg/kg/day) NA (mg/kg/day)" 1.5E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.015 Mercury 0.091 ug/L 1.9E-11 (mg/kg/day) NA (mg/kg/day)" 1.3E-09 (mg/kg/day) 1.4E-04 (mg/kg/day) 0.0000094 Nickel 15.8 ug/L 6.5E-10 (mg/kg/day) NA (mg/kg/day)" 4.6E-08 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.000057 Selenium 1.6 ug/L 3.3E-10 (mg/kg/day) NA (mg/kg/day)" 2.3E-08 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0000046 Thallium 2.3 ug/L 4.8E-10 (mg/kg/day) NA (mg/kg/day)" 3.3E-08 (mg/kg/day) 4.0E-05 (mg/kg/day) 0.00083 Vanadium 30.5 ug/L 6.3E-09 (mg/kg/day) NA (mg/kg/day)" 4.4E-07 (mg/kg/day) 2.6E-04 (mg/kg/day) 0.0017 Zinc 343 ug/L 4.3E-08 (mg/kg/day) NA (mg/kg/day)" 3.0E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0000099 Exp. Route Total 2.2E-08 0.047 Exposure Point Total 9.0E-08 0.08 Exposure Medium Total 9.0E-08 0.08 ------- TABLE 7.5.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of Potential Concern EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Air OWR Inhalation 2-Butanone 9.4E-03 mg/m3 1.8E-06 (mg/m3) NA (ug/m3)"1 1.3E-04 (mg/m3) 1.0E+00 (mg/m3) 0.00013 cis-1,2-Dichloroethene 2.6E-02 mg/m3 5.1E-06 (mg/m3) NA (ug/m3)"1 3.6E-04 (mg/m3) NA (mg/m3) Methyl tert-butyl ether 7.7E-03 mg/m3 1.5E-06 (mg/m3) 2.6E-07 (ug/m3)"1 3.9E-10 1.0E-04 (mg/m3) 3.0E+00 (mg/m3) 0.000035 Trichloroethene 2.0E-01 mg/m3 3.8E-05 (mg/m3) 4.1E-06 (ug/m3)"1 1.6E-07 2.7E-03 (mg/m3) 2.0E-03 (mg/m3) 1.3 1,4-Dioxane 2.5E-03 mg/m3 4.9E-07 (mg/m3) 5.0E-06 (ug/m3)"1 2.4E-09 3.4E-05 (mg/m3) 7.2E-01 (mg/m3) 0.000048 Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.2E-03 (mg/m3) Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.5E-05 (mg/m3) Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-05 (mg/m3) Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-05 (mg/m3) Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 3.0E-04 (mg/m3) Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-04 (mg/m3) Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-02 (mg/m3) Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-04 (mg/m3) Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Exp. Route Total 1.6E-07 1.3 Exposure Point Total 1.6E-07 1.3 Exposure Medium Total 1.6E-07 1.3 Medium Total 2.5E-07 1.4 Total of Receptor Risks Across All Media 4.5E-07 Total of Receptor Hazards Across All Media 2.4 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.6.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 9.5E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 9.5E-09 9.5E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00032 Naphthalene 9.8 mg/kg 3.7E-07 (mg/kg/day) NA (mg/kg/day)" 3.7E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00018 Dieldrin 0.11 mg/kg 4.1E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 6.6E-08 4.1E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00083 Aluminum 9940 mg/kg 3.7E-04 (mg/kg/day) NA (mg/kg/day)" 3.7E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0037 Antimony 6.48 mg/kg 2.4E-07 (mg/kg/day) NA (mg/kg/day)" 2.4E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.006 Arsenic 3.95 mg/kg 8.9E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.3E-07 8.9E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0030 Cobalt 6.32 mg/kg 2.4E-07 (mg/kg/day) NA (mg/kg/day)" 2.4E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0079 Copper 660 mg/kg 2.5E-05 (mg/kg/day) NA (mg/kg/day)" 2.5E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.006 Iron 19200 mg/kg 7.2E-04 (mg/kg/day) NA (mg/kg/day)" 7.2E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.010 Lead 71.4 mg/kg 2.7E-06 (mg/kg/day) NA (mg/kg/day)" 2.7E-05 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.5E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.0061 Thallium 2.13 mg/kg 8.0E-08 (mg/kg/day) NA (mg/kg/day)" 8.0E-07 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0799 Vanadium 23.6 mg/kg 8.9E-07 (mg/kg/day) NA (mg/kg/day)" 8.9E-06 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0018 Zinc 380 mg/kg 1.4E-05 (mg/kg/day) NA (mg/kg/day)" 1.4E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00048 Exp. Route Total 2.1E-07 0.13 Dermal Benzo(a)pyrene 0.252 mg/kg 1.7E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.7E-09 1.7E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000058 Naphthalene 9.8 mg/kg 6.7E-08 (mg/kg/day) NA (mg/kg/day)" 6.7E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000034 Dieldrin 0.11 mg/kg 5.8E-10 (mg/kg/day) 1.6E+01 (mg/kg/day)" 9.3E-09 5.8E-09 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00012 Aluminum 9940 mg/kg 5.3E-06 (mg/kg/day) NA (mg/kg/day)" 5.3E-05 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.000053 Antimony 6.48 mg/kg 3.4E-09 (mg/kg/day) NA (mg/kg/day)" 3.4E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00057 Arsenic 3.95 mg/kg 6.3E-09 (mg/kg/day) 1.5E+00 (mg/kg/day)" 9.4E-09 6.3E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00021 Cobalt 6.32 mg/kg 3.3E-09 (mg/kg/day) NA (mg/kg/day)" 3.3E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00011 Copper 660 mg/kg 3.5E-07 (mg/kg/day) NA (mg/kg/day)" 3.5E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00009 Iron 19200 mg/kg 1.0E-05 (mg/kg/day) NA (mg/kg/day)" 1.0E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00015 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 2.1E-07 (mg/kg/day) NA (mg/kg/day)" 2.1E-06 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.0021 Thallium 2.13 mg/kg 1.1E-09 (mg/kg/day) NA (mg/kg/day)" 1.1E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0011 Vanadium 23.6 mg/kg 1.2E-08 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0010 Zinc 380 mg/kg 2.0E-07 (mg/kg/day) NA (mg/kg/day)" 2.0E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000007 Exp. Route Total 2.0E-08 0.0056 Exposure Point Total 2.3E-07 0.13 Exposure Medium Total 2.3E-07 0.13 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 1.6E-12 (mg/m3) 6.0E-04 (ug/m3)"1 9.3E-13 1.6E-11 (mg/m3) 2.0E-06 (mg/m3) 0.0000078 Naphthalene 1.7E-04 mg/m3 3.3E-06 (mg/m3) 3.4E-05 (ug/m3)"1 1.1E-07 3.3E-05 (mg/m3) 3.0E-03 (mg/m3) 0.011 Dieldrin 3.4E-11 mg/m3 6.8E-13 (mg/m3) 4.6E-03 (ug/m3)"1 3.1E-12 6.8E-12 (mg/m3) NA (mg/m3) Aluminum 3.1E-06 mg/m3 6.1E-08 (mg/m3) NA (ug/m3)"1 6.1E-07 (mg/m3) 5.0E-03 (mg/m3) 0.00012 Antimony 2.0E-09 mg/m3 4.0E-11 (mg/m3) NA (ug/m3)"1 4.0E-10 (mg/m3) NA (mg/m3) Arsenic 1.2E-09 mg/m3 2.4E-11 (mg/m3) 4.3E-03 (ug/m3)"1 1.0E-10 2.4E-10 (mg/m3) 1.5E-05 (mg/m3) 0.000016 Cobalt 2.0E-09 mg/m3 3.9E-11 (mg/m3) 9.0E-03 (ug/m3)"1 3.5E-10 3.9E-10 (mg/m3) 6.0E-06 (mg/m3) 0.000065 Copper 2.0E-07 mg/m3 4.1E-09 (mg/m3) NA (ug/m3)"1 4.1E-08 (mg/m3) NA (mg/m3) Iron 5.9E-06 mg/m3 1.2E-07 (mg/m3) NA (ug/m3)"1 1.2E-06 (mg/m3) NA (mg/m3) Lead 2.2E-08 mg/m3 4.4E-10 (mg/m3) NA (ug/m3)"1 4.4E-09 (mg/m3) NA (mg/m3) Manganese 1.2E-07 mg/m3 2.4E-09 (mg/m3) NA (ug/m3)"1 2.4E-08 (mg/m3) 5.0E-05 (mg/m3) 0.00048 Thallium 6.6E-10 mg/m3 1.3E-11 (mg/m3) NA (ug/m3)"1 1.3E-10 (mg/m3) NA (mg/m3) Vanadium 7.3E-09 mg/m 1.5E-10 (mg/m3) NA (ug/m3)"1 1.5E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000015 Zinc 1.2E-07 mg/m3 2.3E-09 (mg/m3) NA (ug/m3)"1 2.3E-08 (mg/m3) NA (mg/m3) Exp. Route Total 1.1E-07 0.012 Exposure Point Total 1.1E-07 0.012 Exposure Medium Total 1.1E-07 0.012 Medium Total 3.4E-07 0.14 ------- TABLE 7.6.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 1300 ug/L 5.5E-04 (mg/kg/day) NA (mg/kg/day)" 5.9E-03 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.0098 2-Hexanone 41 ug/L 1.7E-05 (mg/kg/day) NA (mg/kg/day)" 1.8E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.037 Chloroform 9.4 ug/L 4.0E-06 (mg/kg/day) 3.1E-02 (mg/kg/day)" 1.2E-07 4.2E-05 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.0042 cis-1,2-Dichloroethene 1.88 ug/L 8.0E-07 (mg/kg/day) NA (mg/kg/day)" 8.5E-06 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0042 Methyl Tert-Butyl Ether 15 ug/L 6.4E-06 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.1E-08 6.8E-05 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 2.8E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 5.9E-08 3.0E-04 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.049 Trichloroethene 10.6 ug/L 4.5E-06 (mg/kg/day) 4.6E-02 (mg/kg/day)" 2.1E-07 4.8E-05 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.095 Vinyl Chloride 0.57 ug/L 2.4E-07 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.7E-07 2.6E-06 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.00086 1,4-Dioxane 3.84 ug/L 1.6E-06 (mg/kg/day) 1.0E-01 (mg/kg/day)" 1.6E-07 1.7E-05 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.00058 Bis(2-ethylhexyl)phthalate 11 ug/L 4.7E-06 (mg/kg/day) 1.4E-02 (mg/kg/day)" 6.5E-08 5.0E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0025 Caprolactam 2800 ug/L 1.2E-03 (mg/kg/day) NA (mg/kg/day)" 1.3E-02 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.025 Aluminum 57655 ug/L 2.4E-02 (mg/kg/day) NA (mg/kg/day)" 2.6E-01 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.26 Antimony 1.31 ug/L 5.6E-07 (mg/kg/day) NA (mg/kg/day)" 5.9E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.015 Arsenic 12.8 ug/L 5.4E-06 (mg/kg/day) 1.5E+00 (mg/kg/day)" 8.1E-06 5.8E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.19 Barium 674 ug/L 2.9E-04 (mg/kg/day) NA (mg/kg/day)" 3.0E-03 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.015 Beryllium 3.46 ug/L 1.5E-06 (mg/kg/day) NA (mg/kg/day)" 1.6E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0078 Cadmium 0.424 ug/L 1.8E-07 (mg/kg/day) NA (mg/kg/day)" 1.9E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0038 Cobalt 63.9 ug/L 2.7E-05 (mg/kg/day) NA (mg/kg/day)" 2.9E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.96 Copper 75.2 ug/L 3.2E-05 (mg/kg/day) NA (mg/kg/day)" 3.4E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0085 Iron 45400 ug/L 1.9E-02 (mg/kg/day) NA (mg/kg/day)" 2.0E-01 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.29 Lead 23.1 ug/L 9.8E-06 (mg/kg/day) NA (mg/kg/day)" 1.0E-04 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 1.1E-03 (mg/kg/day) NA (mg/kg/day)" 1.1E-02 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.47 Mercury 0.128 ug/L 5.4E-08 (mg/kg/day) NA (mg/kg/day)" 5.8E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0019 Nickel 51.7 ug/L 2.2E-05 (mg/kg/day) NA (mg/kg/day)" 2.3E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.012 Selenium 3.1 ug/L 1.3E-06 (mg/kg/day) NA (mg/kg/day)" 1.4E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0028 Thallium 0.539 ug/L 2.3E-07 (mg/kg/day) NA (mg/kg/day)" 2.4E-06 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.24 Vanadium 12.3 ug/L 5.2E-06 (mg/kg/day) NA (mg/kg/day)" 5.5E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.011 Zinc 378 ug/L 1.6E-04 (mg/kg/day) NA (mg/kg/day)" 1.7E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0057 Exp. Route Total 8.9E-06 2.7 Dermal 2-Butanone 1300 ug/L 2.0E-06 (mg/kg/day) NA (mg/kg/day)" 2.1E-05 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.000035 2-Hexanone 41 ug/L 2.6E-07 (mg/kg/day) NA (mg/kg/day)" 2.8E-06 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.00056 Chloroform 9.4 ug/L 9.3E-08 (mg/kg/day) 3.1E-02 (mg/kg/day)" 2.9E-09 9.9E-07 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.00010 cis-1,2-Dichloroethene 1.88 ug/L 2.4E-08 (mg/kg/day) NA (mg/kg/day)" 2.6E-07 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.00013 Methyl Tert-Butyl Ether 15 ug/L 4.0E-08 (mg/kg/day) 1.8E-03 (mg/kg/day)" 7.2E-11 4.2E-07 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 4.5E-06 (mg/kg/day) 2.1E-03 (mg/kg/day)" 9.5E-09 4.8E-05 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.008 Trichloroethene 10.6 ug/L 1.9E-07 (mg/kg/day) 4.6E-02 (mg/kg/day)" 8.9E-09 2.0E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0041 Vinyl Chloride 0.57 ug/L 3.8E-09 (mg/kg/day) 7.2E-01 (mg/kg/day)" 2.7E-09 4.0E-08 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.000013 1,4-Dioxane 3.84 ug/L 2.5E-09 (mg/kg/day) 1.0E-01 (mg/kg/day)" 2.5E-10 2.6E-08 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.00000088 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" 0.0E+00 (mg/kg/day) 2.0E-02 (mg/kg/day) Caprolactam 2800 ug/L 6.5E-06 (mg/kg/day) NA (mg/kg/day)" 6.9E-05 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00014 Aluminum 57655 ug/L 3.6E-05 (mg/kg/day) NA (mg/kg/day)" 3.8E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00038 Antimony 1.31 ug/L 8.2E-10 (mg/kg/day) NA (mg/kg/day)" 8.7E-09 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00014 Arsenic 12.8 ug/L 8.0E-09 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.2E-08 8.5E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00028 Barium 674 ug/L 4.2E-07 (mg/kg/day) NA (mg/kg/day)" 4.5E-06 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.00032 Beryllium 3.46 ug/L 2.2E-09 (mg/kg/day) NA (mg/kg/day)" 2.3E-08 (mg/kg/day) 1.4E-05 (mg/kg/day) 0.0016 Cadmium 0.424 ug/L 2.6E-10 (mg/kg/day) NA (mg/kg/day)" 2.8E-09 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.00011 Cobalt 63.9 ug/L 1.6E-08 (mg/kg/day) NA (mg/kg/day)" 1.7E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00056 Copper 75.2 ug/L 4.7E-08 (mg/kg/day) NA (mg/kg/day)" 5.0E-07 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000012 Iron 45400 ug/L 2.8E-05 (mg/kg/day) NA (mg/kg/day)" 3.0E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00043 Lead 23.1 ug/L 1.4E-09 (mg/kg/day) NA (mg/kg/day)" 1.5E-08 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 1.6E-06 (mg/kg/day) NA (mg/kg/day)" 1.7E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.017 Mercury 0.128 ug/L 8.0E-11 (mg/kg/day) NA (mg/kg/day)" 8.5E-10 (mg/kg/day) 2.1E-05 (mg/kg/day) 0.000040 Nickel 51.7 ug/L 6.4E-09 (mg/kg/day) NA (mq/kq/dav) 6.8E-08 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.000085 Groundwater Groundwater ------- TABLE 7.6.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Selenium 3.1 ug/L 1.9E-09 (mg/kg/day) NA (mg/kg/day)"1 2.1E-08 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0000041 Thallium 0.539 ug/L 3.4E-10 (mg/kg/day) NA (mg/kg/day)"1 3.6E-09 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.00036 Vanadium 12.3 ug/L 7.7E-09 (mg/kg/day) NA (mg/kg/day)"1 8.1E-08 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.00063 Zinc 378 ug/L 1.4E-07 (mg/kg/day) NA (mg/kg/day)"1 1.5E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0000050 Exp. Route Total 3.6E-08 0.035 Exposure Point Total 9.0E-06 2.8 Exposure Medium Total 9.0E-06 2.8 Air OWR Inhalation 2-Butanone 1.7E-02 mg/m3 9.5E-04 (mg/m3) NA (ug/m3)"1 1.0E-02 (mg/m3) 5.0E+00 (mg/m3) 0.0020 2-Hexanone 6.5E-04 mg/m3 3.7E-05 (mg/m3) NA (ug/m3)"1 3.9E-04 (mg/m3) 3.0E-02 (mg/m3) 0.013 Chloroform 4.0E-04 mg/m3 2.3E-05 (mg/m3) 2.3E-05 (ug/m3)"1 5.2E-07 2.4E-04 (mg/m3) 9.8E-02 (mg/m3) 0.0024 cis-1,2-Dichloroethene 8.7E-05 mg/m3 4.9E-06 (mg/m3) NA (ug/m3)"1 5.2E-05 (mg/m3) NA (mg/m3) Methyl Tert-Butyl Ether 5.7E-04 mg/m3 3.2E-05 (mg/m3) 2.6E-07 (ug/m3)"1 8.4E-09 3.4E-04 (mg/m3) 3.0E+00 (mg/m3) 0.00011 Tetrachloroethene 2.6E-03 mg/m3 1.4E-04 (mg/m3) 2.6E-07 (ug/m3)"1 3.8E-08 1.5E-03 (mg/m3) 4.0E-02 (mg/m3) 0.038 Trichloroethene 4.5E-04 mg/m3 2.5E-05 (mg/m3) 4.1E-06 (ug/m3)"1 1.0E-07 2.7E-04 (mg/m3) 2.0E-03 (mg/m3) 0.13 Vinyl Chloride 3.2E-05 mg/m3 1.8E-06 (mg/m3) 4.4E-06 (ug/m3)"1 7.9E-09 1.9E-05 (mg/m3) 1.0E-01 (mg/m3) 0.00019 1,4-Dioxane 4.8E-06 mg/m3 2.7E-07 (mg/m3) 5.0E-06 (ug/m3)"1 1.4E-09 2.9E-06 (mg/m3) 3.0E-02 (mg/m3) 0.000097 Bis(2-ethylhexyl)phthalate 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-06 (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.2E-03 (mg/m3) Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.5E-05 (mg/m3) Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-04 (mg/m3) Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-05 (mg/m3) Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 0.0E+00 (mg/m3) 6.0E-06 (mg/m3) Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-05 (mg/m3) Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 3.0E-04 (mg/m3) Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 0.0E+00 (mg/m3) 9.0E-05 (mg/m3) Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-02 (mg/m3) Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-04 (mg/m3) Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Exp. Route Total 6.8E-07 0.19 Exposure Point Total 6.8E-07 0.19 Exposure Medium Total 6.8E-07 0.19 Medium Total 9.7E-06 3.0 Total of Receptor Risks Across All Media 1.0E-05 Total of Receptor Hazards Across All Media 3.1 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.7.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 2.0E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.0E-07 1.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0036 Naphthalene 9.8 mg/kg 1.2E-06 (mg/kg/day) NA (mg/kg/day)" 4.2E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0021 Dieldrin 0.11 mg/kg 1.3E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.1E-07 4.7E-07 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.0094 Aluminum 9940 mg/kg 1.2E-03 (mg/kg/day) NA (mg/kg/day)" 4.2E-02 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.042 Antimony 6.48 mg/kg 7.9E-07 (mg/kg/day) NA (mg/kg/day)" 2.8E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.069 Arsenic 3.95 mg/kg 2.9E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 4.3E-07 1.0E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.034 Cobalt 6.32 mg/kg 7.7E-07 (mg/kg/day) NA (mg/kg/day)" 2.7E-05 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.090 Copper 660 mg/kg 8.1E-05 (mg/kg/day) NA (mg/kg/day)" 2.8E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.071 Iron 19200 mg/kg 2.3E-03 (mg/kg/day) NA (mg/kg/day)" 8.2E-02 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.12 Lead 71.4 mg/kg 8.7E-06 (mg/kg/day) NA (mg/kg/day)" 3.1E-04 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 4.7E-05 (mg/kg/day) NA (mg/kg/day)" 1.7E-03 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.069 Thallium 2.13 mg/kg 2.6E-07 (mg/kg/day) NA (mg/kg/day)" 9.1E-06 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.91 Vanadium 23.6 mg/kg 2.9E-06 (mg/kg/day) NA (mg/kg/day)" 1.0E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.020 Zinc 380 mg/kg 4.6E-05 (mg/kg/day) NA (mg/kg/day)" 1.6E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0054 Exp. Route Total 8.5E-07 1.4 Dermal Benzo(a)pyrene 0.252 mg/kg 2.5E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.5E-08 1.3E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00044 Naphthalene 9.8 mg/kg 1.5E-07 (mg/kg/day) NA (mg/kg/day)" 5.2E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00026 Dieldrin 0.11 mg/kg 1.3E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.0E-08 4.5E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00089 Aluminum 9940 mg/kg 1.2E-05 (mg/kg/day) NA (mg/kg/day)" 4.0E-04 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.00040 Antimony 6.48 mg/kg 7.5E-09 (mg/kg/day) NA (mg/kg/day)" 2.6E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0044 Arsenic 3.95 mg/kg 1.4E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.1E-08 4.8E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0016 Cobalt 6.32 mg/kg 7.3E-09 (mg/kg/day) NA (mg/kg/day)" 2.6E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00085 Copper 660 mg/kg 7.7E-07 (mg/kg/day) NA (mg/kg/day)" 2.7E-05 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.00067 Iron 19200 mg/kg 2.2E-05 (mg/kg/day) NA (mg/kg/day)" 7.8E-04 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0011 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 4.5E-07 (mg/kg/day) NA (mg/kg/day)" 1.6E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.016 Thallium 2.13 mg/kg 2.5E-09 (mg/kg/day) NA (mg/kg/day)" 8.6E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0086 Vanadium 23.6 mg/kg 2.7E-08 (mg/kg/day) NA (mg/kg/day)" 9.6E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0074 Zinc 380 mg/kg 4.4E-07 (mg/kg/day) NA (mg/kg/day)" 1.5E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000051 Exp. Route Total 6.6E-08 0.043 Exposure Point Total 9.1E-07 1.5 Exposure Medium Total 9.1E-07 1.5 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 9.3E-12 (mg/m3) 6.0E-04 (ug/m3)"1 5.6E-12 5.0E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000025 Naphthalene 1.7E-04 mg/m3 3.0E-06 (mg/m3) 3.4E-05 (ug/m3)"1 1.0E-07 1.1E-04 (mg/m3) 3.0E-03 (mg/m3) 0.035 Dieldrin 3.4E-11 mg/m3 6.2E-13 (mg/m3) 4.6E-03 (ug/m3)"1 2.9E-12 2.2E-11 (mg/m3) NA (mg/m3) Aluminum 3.1E-06 mg/m3 5.6E-08 (mg/m3) NA (ug/m3)"1 2.0E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00039 Antimony 2.0E-09 mg/m3 3.7E-11 (mg/m3) NA (ug/m3)"1 1.3E-09 (mg/m3) NA (mg/m3) Arsenic 1.2E-09 mg/m3 2.2E-11 (mg/m3) 4.3E-03 (ug/m3)"1 9.6E-11 7.8E-10 (mg/m3) 1.5E-05 (mg/m3) 0.000052 Cobalt 2.0E-09 mg/m3 3.6E-11 (mg/m3) 9.0E-03 (ug/m3)"1 3.2E-10 1.3E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00021 Copper 2.0E-07 mg/m3 3.7E-09 (mg/m3) NA (ug/m3)"1 1.3E-07 (mg/m3) NA (mg/m3) Iron 5.9E-06 mg/m3 1.1E-07 (mg/m3) NA (ug/m3)"1 3.8E-06 (mg/m3) NA (mg/m3) Lead 2.2E-08 mg/m3 4.0E-10 (mg/m3) NA (ug/m3)"1 1.4E-08 (mg/m3) NA (mg/m3) Manganese 1.2E-07 mg/m3 2.2E-09 (mg/m3) NA (ug/m3)"1 7.7E-08 (mg/m3) 5.0E-05 (mg/m3) 0.0015 Thallium 6.6E-10 mg/m3 1.2E-11 (mg/m3) NA (ug/m3)"1 4.2E-10 (mg/m3) NA (mg/m3) Vanadium 7.3E-09 mg/m3 1.3E-10 (mg/m3) NA (ug/m3)"1 4.7E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000047 Zinc 1.2E-07 mg/m3 2.1E-09 (mg/m3) NA (ug/m3)"1 7.5E-08 (mg/m3) NA (mg/m3) Exp. Route Total 1.0E-07 0.038 Exposure Point Total 1.0E-07 0.038 Exposure Medium Total 1.0E-07 0.038 Medium Total 1.0E-06 1.5 ------- TABLE 7.7.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 1300 ug/L 1.1E-03 (mg/kg/day) NA (mg/kg/day)" 2.5E-02 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.042 2-Hexanone 41 ug/L 3.4E-05 (mg/kg/day) NA (mg/kg/day)" 7.9E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.16 Chloroform 9.4 ug/L 7.7E-06 (mg/kg/day) 3.1E-02 (mg/kg/day)" 2.4E-07 1.8E-04 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.018 cis-1,2-Dichloroethene 1.88 ug/L 1.5E-06 (mg/kg/day) NA (mg/kg/day)" 3.6E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.018 Methyl Tert-Butyl Ether 15 ug/L 1.2E-05 (mg/kg/day) 1.8E-03 (mg/kg/day)" 2.2E-08 2.9E-04 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 5.4E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 1.1E-07 1.3E-03 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.21 Trichloroethene (Mutagenic) 10.6 ug/L 6.7E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 6.2E-07 2.0E-04 (mg/kg/day) NA (mg/kg/day) Trichloroethene (Nonmutagenic 10.6 ug/L 8.7E-06 (mg/kg/day) 3.7E-02 (mg/kg/day)" 3.2E-07 2.0E-04 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.41 Vinyl Chloride 0.57 ug/L 1.8E-05 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.3E-05 1.1E-05 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.0037 1,4-Dioxane 3.84 ug/L 3.2E-06 (mg/kg/day) 1.0E-01 (mg/kg/day)" 3.2E-07 7.4E-05 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.0025 Bis(2-ethylhexyl)phthalate 11 ug/L 9.1E-06 (mg/kg/day) 1.4E-02 (mg/kg/day)" 1.3E-07 2.1E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.011 Caprolactam 2800 ug/L 2.3E-03 (mg/kg/day) NA (mg/kg/day)" 5.4E-02 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.11 Aluminum 57655 ug/L 4.8E-02 (mg/kg/day) NA (mg/kg/day)" 1.1E+00 (mg/kg/day) 1.0E+00 (mg/kg/day) 1.11 Antimony 1.31 ug/L 1.1E-06 (mg/kg/day) NA (mg/kg/day)" 2.5E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.063 Arsenic 12.8 ug/L 1.1E-05 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.6E-05 2.5E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.82 Barium 674 ug/L 5.6E-04 (mg/kg/day) NA (mg/kg/day)" 1.3E-02 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.065 Beryllium 3.46 ug/L 2.9E-06 (mg/kg/day) NA (mg/kg/day)" 6.7E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.033 Cadmium 0.424 ug/L 3.5E-07 (mg/kg/day) NA (mg/kg/day)" 8.2E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.016 Cobalt 63.9 ug/L 5.3E-05 (mg/kg/day) NA (mg/kg/day)" 1.2E-03 (mg/kg/day) 3.0E-04 (mg/kg/day) 4.1 Copper 75.2 ug/L 6.2E-05 (mg/kg/day) NA (mg/kg/day)" 1.4E-03 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0362 Iron 45400 ug/L 3.7E-02 (mg/kg/day) NA (mg/kg/day)" 8.7E-01 (mg/kg/day) 7.0E-01 (mg/kg/day) 1.25 Lead 23.1 ug/L 1.9E-05 (mg/kg/day) NA (mg/kg/day)" 4.4E-04 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 2.1E-03 (mg/kg/day) NA (mg/kg/day)" 4.9E-02 (mg/kg/day) 2.4E-02 (mg/kg/day) 2.0 Mercury 0.128 ug/L 1.1E-07 (mg/kg/day) NA (mg/kg/day)" 2.5E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0082 Nickel 51.7 ug/L 4.3E-05 (mg/kg/day) NA (mg/kg/day)" 9.9E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.050 Selenium 3.1 ug/L 2.6E-06 (mg/kg/day) NA (mg/kg/day)" 6.0E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.012 Thallium 0.539 ug/L 4.4E-07 (mg/kg/day) NA (mg/kg/day)" 1.0E-05 (mg/kg/day) 1.0E-05 (mg/kg/day) 1.04 Vanadium 12.3 ug/L 1.0E-05 (mg/kg/day) NA (mg/kg/day)" 2.4E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.047 Zinc 378 ug/L 3.1E-04 (mg/kg/day) NA (mg/kg/day)" 7.3E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.024 Exp. Route Total 3.0E-05 12 Dermal 2-Butanone 1300 ug/L 1.2E-05 (mg/kg/day) NA (mg/kg/day)" 2.8E-04 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.00046 2-Hexanone 41 ug/L 1.7E-06 (mg/kg/day) NA (mg/kg/day)" 3.9E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0078 Chloroform 9.4 ug/L 8.3E-07 (mg/kg/day) 3.1E-02 (mg/kg/day)" 2.6E-08 1.9E-05 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.0019 cis-1,2-Dichloroethene 1.88 ug/L 2.3E-07 (mg/kg/day) NA (mg/kg/day)" 5.4E-06 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0027 Methyl Tert-Butyl Ether 15 ug/L 3.4E-07 (mg/kg/day) 1.8E-03 (mg/kg/day)" 6.0E-10 7.8E-06 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 3.8E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 8.1E-08 9.0E-04 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.15 Trichloroethene (Mutagenic) 10.6 ug/L 1.3E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 1.2E-07 4.0E-05 (mg/kg/day) NA (mg/kg/day) Trichloroethene (Nonmutagenic 10.6 ug/L 1.7E-06 (mg/kg/day) 3.7E-02 (mg/kg/day)" 6.4E-08 4.0E-05 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.080 Vinyl Chloride 0.57 ug/L 1.6E-06 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.2E-06 1.0E-06 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.00033 1,4-Dioxane 3.84 ug/L 1.4E-08 (mg/kg/day) 1.0E-01 (mg/kg/day)" 1.4E-09 3.2E-07 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.000011 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" 0.0E+00 (mg/kg/day) 2.0E-02 (mg/kg/day) Caprolactam 2800 ug/L 3.5E-05 (mg/kg/day) NA (mg/kg/day)" 8.1E-04 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.0016 Aluminum 57655 ug/L 2.2E-04 (mg/kg/day) NA (mg/kg/day)" 5.2E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0052 Antimony 1.31 ug/L 5.0E-09 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.0020 Arsenic 12.8 ug/L 4.9E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 7.4E-08 1.1E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0038 Barium 674 ug/L 2.6E-06 (mg/kg/day) NA (mg/kg/day)" 6.1E-05 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.0043 Beryllium 3.46 ug/L 1.3E-08 (mg/kg/day) NA (mg/kg/day)" 3.1E-07 (mg/kg/day) 1.4E-05 (mg/kg/day) 0.022 Cadmium 0.424 ug/L 1.6E-09 (mg/kg/day) NA (mg/kg/day)" 3.8E-08 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.0015 Cobalt 63.9 ug/L 9.8E-08 (mg/kg/day) NA (mg/kg/day)" 2.3E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0076 Copper 75.2 ug/L 2.9E-07 (mg/kg/day) NA (mg/kg/day)" 6.8E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000169 Iron 45400 ug/L 1.7E-04 (mg/kg/day) NA (mg/kg/day)" 4.1E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0058 Lead 23.1 ug/L 8.9E-09 (mg/kg/day) NA (mg/kg/day)" 2.1E-07 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 9.7E-06 (mg/kg/day) NA (mq/kq/dav) 2.3E-04 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.24 Groundwater Groundwater ------- TABLE 7.7.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Mercury 0.128 ug/L 4.9E-10 (mg/kg/day) NA (mg/kg/day)" 1.1E-08 (mg/kg/day) 2.1E-05 (mg/kg/day) 0.00055 Nickel 51.7 ug/L 4.0E-08 (mg/kg/day) NA (mg/kg/day)" 9.3E-07 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0012 Selenium 3.1 ug/L 1.2E-08 (mg/kg/day) NA (mg/kg/day)" 2.8E-07 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.000056 Thallium 0.539 ug/L 2.1E-09 (mg/kg/day) NA (mg/kg/day)" 4.8E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0048 Vanadium 12.3 ug/L 4.7E-08 (mg/kg/day) NA (mg/kg/day)" 1.1E-06 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0085 Zinc 378 ug/L 8.7E-07 (mg/kg/day) NA (mg/kg/day)" 2.0E-05 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000068 Exp. Route Total 1.5E-06 0.55 Exposure Point Total 3.2E-05 12 Exposure Medium Total 3.2E-05 12 Medium Total 3.2E-05 12 Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 1.9E-07 (mg/kg/day) NA (mg/kg/day)"1 6.6E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.022 Nickel 1500 mg/kg 2.0E-05 (mg/kg/day) NA (mg/kg/day)"1 7.1E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.036 Exp. Route Total 0.058 Dermal Cobalt 14 mg/kg 1.8E-09 (mg/kg/day) NA (mg/kg/day)"1 6.3E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000 Nickel 1500 mg/kg 1.9E-07 (mg/kg/day) NA (mg/kg/day)"1 6.8E-06 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0085 Exp. Route Total 0.009 Exposure Point Total 0.07 Exposure Medium Total 0.07 Medium Total 0.07 Total of Receptor Risks Across All Media 3.3E-05 Total of Receptor Hazards Across All Media 14 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.8.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 1.6E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 1.6E-08 1.0E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00034 Naphthalene 9.8 mg/kg 3.9E-07 (mg/kg/day) NA (mg/kg/day)" 3.9E-06 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.00020 Dieldrin 0.11 mg/kg 4.4E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 7.1E-08 4.4E-08 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00088 Aluminum 9940 mg/kg 4.0E-04 (mg/kg/day) NA (mg/kg/day)" 4.0E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0040 Antimony 6.48 mg/kg 2.6E-07 (mg/kg/day) NA (mg/kg/day)" 2.6E-06 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.0065 Arsenic 3.95 mg/kg 9.5E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.4E-07 9.5E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0032 Cobalt 6.32 mg/kg 2.5E-07 (mg/kg/day) NA (mg/kg/day)" 2.5E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0084 Copper 660 mg/kg 2.6E-05 (mg/kg/day) NA (mg/kg/day)" 2.6E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.0066 Iron 19200 mg/kg 7.7E-04 (mg/kg/day) NA (mg/kg/day)" 7.7E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.011 Lead 71.4 mg/kg 2.9E-06 (mg/kg/day) NA (mg/kg/day)" 2.9E-05 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" 1.6E-04 (mg/kg/day) 2.4E-02 (mg/kg/day) 0.0065 Thallium 2.13 mg/kg 8.5E-08 (mg/kg/day) NA (mg/kg/day)" 8.5E-07 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.085 Vanadium 23.6 mg/kg 9.5E-07 (mg/kg/day) NA (mg/kg/day)" 9.5E-06 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0019 Zinc 380 mg/kg 1.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.5E-04 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.00051 Exp. Route Total 2.3E-07 0.14 Dermal Benzo(a)pyrene 0.252 mg/kg 2.5E-09 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.5E-09 1.6E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.000053 Naphthalene 9.8 mg/kg 6.2E-08 (mg/kg/day) NA (mg/kg/day)" 6.2E-07 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.000031 Dieldrin 0.11 mg/kg 5.3E-10 (mg/kg/day) 1.6E+01 (mg/kg/day)" 8.5E-09 5.3E-09 (mg/kg/day) 5.0E-05 (mg/kg/day) 0.00011 Aluminum 9940 mg/kg 4.8E-06 (mg/kg/day) NA (mg/kg/day)" 4.8E-05 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.000048 Antimony 6.48 mg/kg 3.1E-09 (mg/kg/day) NA (mg/kg/day)" 3.1E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00052 Arsenic 3.95 mg/kg 5.7E-09 (mg/kg/day) 1.5E+00 (mg/kg/day)" 8.6E-09 5.7E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00019 Cobalt 6.32 mg/kg 3.1E-09 (mg/kg/day) NA (mg/kg/day)" 3.1E-08 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.00010 Copper 660 mg/kg 3.2E-07 (mg/kg/day) NA (mg/kg/day)" 3.2E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000080 Iron 19200 mg/kg 9.3E-06 (mg/kg/day) NA (mg/kg/day)" 9.3E-05 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.00013 Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" 0.0E+00 (mg/kg/day) NA (mg/kg/day) Manganese 388 mg/kg 1.9E-07 (mg/kg/day) NA (mg/kg/day)" 1.9E-06 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.0020 Thallium 2.13 mg/kg 1.0E-09 (mg/kg/day) NA (mg/kg/day)" 1.0E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0010 Vanadium 23.6 mg/kg 1.1E-08 (mg/kg/day) NA (mg/kg/day)" 1.1E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.00088 Zinc 380 mg/kg 1.8E-07 (mg/kg/day) NA (mg/kg/day)" 1.8E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.0000061 Exp. Route Total 2.0E-08 0.0051 Exposure Point Total 2.5E-07 0.14 Exposure Medium Total 2.5E-07 0.14 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 7.8E-12 (mg/m3) 6.0E-04 (ug/m3)"1 4.7E-12 5.0E-11 (mg/m3) 2.0E-06 (mg/m3) 0.000025 Naphthalene 1.7E-04 mg/m3 1.1E-05 (mg/m3) 3.4E-05 (ug/m3)"1 3.6E-07 1.1E-04 (mg/m3) 3.0E-03 (mg/m3) 0.035 Dieldrin 3.4E-11 mg/m3 2.2E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.0E-11 2.2E-11 (mg/m3) NA (mg/m3) Aluminum 3.1E-06 mg/m3 2.0E-07 (mg/m3) NA (ug/m3)"1 2.0E-06 (mg/m3) 5.0E-03 (mg/m3) 0.00039 Antimony 2.0E-09 mg/m3 1.3E-10 (mg/m3) NA (ug/m3)"1 1.3E-09 (mg/m3) NA (mg/m3) Arsenic 1.2E-09 mg/m3 7.8E-11 (mg/m3) 4.3E-03 (ug/m3)"1 3.4E-10 7.8E-10 (mg/m3) 1.5E-05 (mg/m3) 0.000052 Cobalt 2.0E-09 mg/m3 1.3E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.1E-09 1.3E-09 (mg/m3) 6.0E-06 (mg/m3) 0.00021 Copper 2.0E-07 mg/m3 1.3E-08 (mg/m3) NA (ug/m3)"1 1.3E-07 (mg/m3) NA (mg/m3) Iron 5.9E-06 mg/m3 3.8E-07 (mg/m3) NA (ug/m3)"1 3.8E-06 (mg/m3) NA (mg/m3) Lead 2.2E-08 mg/m3 1.4E-09 (mg/m3) NA (ug/m3)"1 1.4E-08 (mg/m3) NA (mg/m3) Manganese 1.2E-07 mg/m3 7.7E-09 (mg/m3) NA (ug/m3)"1 7.7E-08 (mg/m3) 5.0E-05 (mg/m3) 0.0015 Thallium 6.6E-10 mg/m3 4.2E-11 (mg/m3) NA (ug/m3)"1 4.2E-10 (mg/m3) NA (mg/m3) Vanadium 7.3E-09 mg/m3 4.7E-10 (mg/m3) NA (ug/m3)"1 4.7E-09 (mg/m3) 1.0E-04 (mg/m3) 0.000047 Zinc 1.2E-07 mg/m3 7.5E-09 (mg/m3) NA (ug/m3)"1 7.5E-08 (mg/m3) NA (mg/m3) Exp. Route Total 3.6E-07 0.038 Exposure Point Total 3.6E-07 0.038 Exposure Medium Total 3.6E-07 0.038 Medium Total 6.1E-07 0.18 ------- TABLE 7.8.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 1300 ug/L 1.6E-03 (mg/kg/day) NA (mg/kg/day)" 1.3E-02 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.021 2-Hexanone 41 ug/L 5.1E-05 (mg/kg/day) NA (mg/kg/day)" 3.9E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.079 Chloroform 9.4 ug/L 1.2E-05 (mg/kg/day) 3.1E-02 (mg/kg/day)" 3.6E-07 9.0E-05 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.0090 cis-1,2-Dichloroethene 1.88 ug/L 2.3E-06 (mg/kg/day) NA (mg/kg/day)" 1.8E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0090 Methyl Tert-Butyl Ether 15 ug/L 1.9E-05 (mg/kg/day) 1.8E-03 (mg/kg/day)" 3.3E-08 1.4E-04 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 8.1E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 1.7E-07 6.3E-04 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.11 Trichloroethene (Mutagenic) 10.6 ug/L 1.9E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 1.8E-07 1.0E-04 (mg/kg/day) NA (mg/kg/day) Trichloroethene (Nonmutagenic 10.6 ug/L 1.3E-05 (mg/kg/day) 3.7E-02 (mg/kg/day)" 4.8E-07 1.0E-04 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.20 Vinyl Chloride 0.57 ug/L 7.0E-07 (mg/kg/day) 7.2E-01 (mg/kg/day)" 5.1E-07 5.5E-06 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.0018 1,4-Dioxane 3.84 ug/L 4.7E-06 (mg/kg/day) 1.0E-01 (mg/kg/day)" 4.7E-07 3.7E-05 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.0012 Bis(2-ethylhexyl)phthalate 11 ug/L 1.4E-05 (mg/kg/day) 1.4E-02 (mg/kg/day)" 1.9E-07 1.1E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0053 Caprolactam 2800 ug/L 3.5E-03 (mg/kg/day) NA (mg/kg/day)" 2.7E-02 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.054 Aluminum 57655 ug/L 7.1E-02 (mg/kg/day) NA (mg/kg/day)" 5.5E-01 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.55 Antimony 1.31 ug/L 1.6E-06 (mg/kg/day) NA (mg/kg/day)" 1.3E-05 (mg/kg/day) 4.0E-04 (mg/kg/day) 0.031 Arsenic 12.8 ug/L 1.6E-05 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.4E-05 1.2E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.41 Barium 674 ug/L 8.3E-04 (mg/kg/day) NA (mg/kg/day)" 6.5E-03 (mg/kg/day) 2.0E-01 (mg/kg/day) 0.032 Beryllium 3.46 ug/L 4.3E-06 (mg/kg/day) NA (mg/kg/day)" 3.3E-05 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.017 Cadmium 0.424 ug/L 5.2E-07 (mg/kg/day) NA (mg/kg/day)" 4.1E-06 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.0082 Cobalt 63.9 ug/L 7.9E-05 (mg/kg/day) NA (mg/kg/day)" 6.1E-04 (mg/kg/day) 3.0E-04 (mg/kg/day) 2.0 Copper 75.2 ug/L 9.3E-05 (mg/kg/day) NA (mg/kg/day)" 7.2E-04 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.018 Iron 45400 ug/L 5.6E-02 (mg/kg/day) NA (mg/kg/day)" 4.4E-01 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.62 Lead 23.1 ug/L 2.9E-05 (mg/kg/day) NA (mg/kg/day)" 2.2E-04 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 3.1E-03 (mg/kg/day) NA (mg/kg/day)" 2.4E-02 (mg/kg/day) 2.4E-02 (mg/kg/day) 1.01 Mercury 0.128 ug/L 1.6E-07 (mg/kg/day) NA (mg/kg/day)" 1.2E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0041 Nickel 51.7 ug/L 6.4E-05 (mg/kg/day) NA (mg/kg/day)" 5.0E-04 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.025 Selenium 3.1 ug/L 3.8E-06 (mg/kg/day) NA (mg/kg/day)" 3.0E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0060 Thallium 0.539 ug/L 6.7E-07 (mg/kg/day) NA (mg/kg/day)" 5.2E-06 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.52 Vanadium 12.3 ug/L 1.5E-05 (mg/kg/day) NA (mg/kg/day)" 1.2E-04 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.024 Zinc 378 ug/L 4.7E-04 (mg/kg/day) NA (mg/kg/day)" 3.6E-03 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.012 Exp. Route Total 2.6E-05 5.8 Dermal 2-Butanone 1300 ug/L 1.6E-05 (mg/kg/day) NA (mg/kg/day)" 1.2E-04 (mg/kg/day) 6.0E-01 (mg/kg/day) 0.00021 2-Hexanone 41 ug/L 2.1E-06 (mg/kg/day) NA (mg/kg/day)" 1.7E-05 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.0033 Chloroform 9.4 ug/L 7.5E-07 (mg/kg/day) 3.1E-02 (mg/kg/day)" 2.3E-08 5.9E-06 (mg/kg/day) 1.0E-02 (mg/kg/day) 0.00059 cis-1,2-Dichloroethene 1.88 ug/L 2.0E-07 (mg/kg/day) NA (mg/kg/day)" 1.5E-06 (mg/kg/day) 2.0E-03 (mg/kg/day) 0.0008 Methyl Tert-Butyl Ether 15 ug/L 3.2E-07 (mg/kg/day) 1.8E-03 (mg/kg/day)" 5.8E-10 2.5E-06 (mg/kg/day) NA (mg/kg/day) Tetrachloroethene 65.7 ug/L 3.7E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 7.7E-08 2.9E-04 (mg/kg/day) 6.0E-03 (mg/kg/day) 0.048 Trichloroethene (Mutagenic) 10.6 ug/L 2.3E-06 (mg/kg/day) 9.3E-03 (mg/kg/day)" 2.1E-08 1.2E-05 (mg/kg/day) NA (mg/kg/day) Trichloroethene (Nonmutagenic 10.6 ug/L 1.6E-06 (mg/kg/day) 3.7E-02 (mg/kg/day)" 5.8E-08 1.2E-05 (mg/kg/day) 5.0E-04 (mg/kg/day) 0.024 Vinyl Chloride 0.57 ug/L 3.1E-08 (mg/kg/day) 7.2E-01 (mg/kg/day)" 2.2E-08 2.4E-07 (mg/kg/day) 3.0E-03 (mg/kg/day) 0.000080 1,4-Dioxane 3.84 ug/L 2.0E-08 (mg/kg/day) 1.0E-01 (mg/kg/day)" 2.0E-09 1.6E-07 (mg/kg/day) 3.0E-02 (mg/kg/day) 0.0000052 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" 0.0E+00 (mg/kg/day) 2.0E-02 (mg/kg/day) Caprolactam 2800 ug/L 5.3E-05 (mg/kg/day) NA (mg/kg/day)" 4.1E-04 (mg/kg/day) 5.0E-01 (mg/kg/day) 0.00082 Aluminum 57655 ug/L 2.9E-04 (mg/kg/day) NA (mg/kg/day)" 2.3E-03 (mg/kg/day) 1.0E+00 (mg/kg/day) 0.0023 Antimony 1.31 ug/L 6.6E-09 (mg/kg/day) NA (mg/kg/day)" 5.2E-08 (mg/kg/day) 6.0E-05 (mg/kg/day) 0.00086 Arsenic 12.8 ug/L 6.5E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 9.7E-08 5.0E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0017 Barium 674 ug/L 3.4E-06 (mg/kg/day) NA (mg/kg/day)" 2.7E-05 (mg/kg/day) 1.4E-02 (mg/kg/day) 0.0019 Beryllium 3.46 ug/L 1.8E-08 (mg/kg/day) NA (mg/kg/day)" 1.4E-07 (mg/kg/day) 1.4E-05 (mg/kg/day) 0.0097 Cadmium 0.424 ug/L 2.1E-09 (mg/kg/day) NA (mg/kg/day)" 1.7E-08 (mg/kg/day) 2.5E-05 (mg/kg/day) 0.00067 Cobalt 63.9 ug/L 1.3E-07 (mg/kg/day) NA (mg/kg/day)" 1.0E-06 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0034 Copper 75.2 ug/L 3.8E-07 (mg/kg/day) NA (mg/kg/day)" 3.0E-06 (mg/kg/day) 4.0E-02 (mg/kg/day) 0.000074 Iron 45400 ug/L 2.3E-04 (mg/kg/day) NA (mg/kg/day)" 1.8E-03 (mg/kg/day) 7.0E-01 (mg/kg/day) 0.0026 Lead 23.1 ug/L 1.2E-08 (mg/kg/day) NA (mg/kg/day)" 9.1E-08 (mg/kg/day) NA (mg/kg/day) Manganese 2525 ug/L 1.3E-05 (mg/kg/day) NA (mq/kq/dav) 9.9E-05 (mg/kg/day) 9.6E-04 (mg/kg/day) 0.10 Groundwater Groundwater ------- TABLE 7.8.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Mercury 0.128 ug/L 6.5E-10 (mg/kg/day) NA (mg/kg/day)" 5.0E-09 (mg/kg/day) 2.1E-05 (mg/kg/day) 0.00024 Nickel 51.7 ug/L 5.2E-08 (mg/kg/day) NA (mg/kg/day)" 4.1E-07 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.00051 Selenium 3.1 ug/L 1.6E-08 (mg/kg/day) NA (mg/kg/day)" 1.2E-07 (mg/kg/day) 5.0E-03 (mg/kg/day) 0.000024 Thallium 0.539 ug/L 2.7E-09 (mg/kg/day) NA (mg/kg/day)" 2.1E-08 (mg/kg/day) 1.0E-05 (mg/kg/day) 0.0021 Vanadium 12.3 ug/L 6.2E-08 (mg/kg/day) NA (mg/kg/day)" 4.8E-07 (mg/kg/day) 1.3E-04 (mg/kg/day) 0.0037 Zinc 378 ug/L 1.1E-06 (mg/kg/day) NA (mg/kg/day)" 8.9E-06 (mg/kg/day) 3.0E-01 (mg/kg/day) 0.000030 Exp. Route Total 3.0E-07 0.21 Exposure Point Total 2.6E-05 6.0 Exposure Medium Total 2.6E-05 6.0 Air OWR Inhalation 2-Butanone 1.7E-02 mg/m3 1.4E-03 (mg/m3) NA (ug/m3)"1 1.1E-02 (mg/m3) 5.0E+00 (mg/m3) 0.0022 2-Hexanone 6.5E-04 mg/m3 5.4E-05 (mg/m3) NA (ug/m3)"1 4.2E-04 (mg/m3) 3.0E-02 (mg/m3) 0.014 Chloroform 4.0E-04 mg/m3 3.3E-05 (mg/m3) 2.3E-05 (ug/m3)"1 7.6E-07 2.6E-04 (mg/m3) 9.8E-02 (mg/m3) 0.0026 cis-1,2-Dichloroethene 8.7E-05 mg/m3 7.1E-06 (mg/m3) NA (ug/m3)"1 5.6E-05 (mg/m3) NA (mg/m3) Methyl Tert-Butyl Ether 5.7E-04 mg/m3 4.7E-05 (mg/m3) 2.6E-07 (ug/m3)"1 1.2E-08 3.7E-04 (mg/m3) 3.0E+00 (mg/m3) 0.00012 Tetrachloroethene 2.6E-03 mg/m3 2.1E-04 (mg/m3) 2.6E-07 (ug/m3)"1 5.5E-08 1.6E-03 (mg/m3) 4.0E-02 (mg/m3) 0.041 Trichloroethene (Mutagenic) 4.5E-04 mg/m3 5.3E-05 (mg/m3) 1.0E-06 (ug/m3)"1 5.3E-08 2.9E-04 (mg/m3) NA (mg/m3) Trichloroethene (Nonmutagenic 4.5E-04 mg/m3 3.7E-05 (mg/m3) 3.1E-06 (ug/m3)"1 1.1E-07 2.9E-04 (mg/m3) 2.0E-03 (mg/m3) 0.14 Vinyl Chloride 3.2E-05 mg/m3 2.6E-06 (mg/m3) 4.4E-06 (ug/m3)"1 1.2E-08 2.0E-05 (mg/m3) 1.0E-01 (mg/m3) 0.00020 1,4-Dioxane 4.8E-06 mg/m3 4.0E-07 (mg/m3) 5.0E-06 (ug/m3)"1 2.0E-09 3.1E-06 (mg/m3) 3.0E-02 (mg/m3) 0.00010 Bis(2-ethylhexyl)phthalate 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-06 (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.2E-03 (mg/m3) Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-03 (mg/m3) Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.5E-05 (mg/m3) Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-04 (mg/m3) Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-05 (mg/m3) Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-05 (mg/m3) Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 0.0E+00 (mg/m3) 6.0E-06 (mg/m3) Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 5.0E-05 (mg/m3) Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 3.0E-04 (mg/m3) Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 0.0E+00 (mg/m3) 9.0E-05 (mg/m3) Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 2.0E-02 (mg/m3) Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) 1.0E-04 (mg/m3) Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 0.0E+00 (mg/m3) NA (mg/m3) Exp. Route Total 1.0E-06 0.20 Exposure Point Total 1.0E-06 0.20 Exposure Medium Total 1.0E-06 0.20 Medium Total 2.7E-05 6.2 ------- TABLE 7.8.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 4 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 6.2E-08 (mg/kg/day) NA (mg/kg/day)"1 6.2E-07 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0021 [Nickel 1500 mg/kg 6.7E-06 (mg/kg/day) NA (mg/kg/day)"1 6.7E-05 (mg/kg/day) 2.0E-02 (mg/kg/day) 0.0033 I Exp. Route Total | 0.0054 Dermal jCobalt 14 mg/kg 7.5E-10 (mg/kg/day) NA (mg/kg/day)"1 7.5E-09 (mg/kg/day) 3.0E-04 (mg/kg/day) 0.0000 | Nickel 1500 mg/kg 8.1E-08 (mg/kg/day) NA (mg/kg/day)"1 8.1E-07 (mg/kg/day) 8.0E-04 (mg/kg/day) 0.0010 Exp. Route Total jj 0.0010 Exposure Point Total 0.006 Exposure Medium Total 0.006 Medium Total 0.006 Total of Receptor Risks Across All Media 2.8E-05 Total of Receptor Hazards Across All Media 6.4 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 7.9.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Surface/Subsurface Soil Surface/Subsurface Soil OWR Ingestion Benzo(a)pyrene 0.252 mg/kg 2.2E-07 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.2E-07 Naphthalene 9.8 mg/kg 1.6E-06 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 1.8E-08 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.9E-07 Aluminum 9940 mg/kg 1.6E-03 (mg/kg/day) NA (mg/kg/day)" Antimony 6.48 mg/kg 1.1E-06 (mg/kg/day) NA (mg/kg/day)" Arsenic 3.95 mg/kg 3.8E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 5.8E-07 Cobalt 6.32 mg/kg 1.0E-06 (mg/kg/day) NA (mg/kg/day)" Copper 660 mg/kg 1.1E-04 (mg/kg/day) NA (mg/kg/day)" Iron 19200 mg/kg 3.1E-03 (mg/kg/day) NA (mg/kg/day)" Lead 71.4 mg/kg 1.2E-05 (mg/kg/day) NA (mg/kg/day)" Manganese 388 mg/kg 6.3E-05 (mg/kg/day) NA (mg/kg/day)" Thallium 2.13 mg/kg 3.5E-07 (mg/kg/day) NA (mg/kg/day)" Vanadium 23.6 mg/kg 3.8E-06 (mg/kg/day) NA (mg/kg/day)" Zinc 380 mg/kg 6.2E-05 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 1.1E-06 Dermal Benzo(a)pyrene 0.252 mg/kg 2.7E-08 (mg/kg/day) 1.0E+00 (mg/kg/day)" 2.7E-08 Naphthalene 9.8 mg/kg 2.1E-07 (mg/kg/day) NA (mg/kg/day)" Dieldrin 0.11 mg/kg 1.8E-09 (mg/kg/day) 1.6E+01 (mg/kg/day)" 2.9E-08 Aluminum 9940 mg/kg 1.6E-05 (mg/kg/day) NA (mg/kg/day)" Antimony 6.48 mg/kg 1.1E-08 (mg/kg/day) NA (mg/kg/day)" Arsenic 3.95 mg/kg 1.9E-08 (mg/kg/day) 1.5E+00 (mg/kg/day)" 2.9E-08 Cobalt 6.32 mg/kg 1.0E-08 (mg/kg/day) NA (mg/kg/day)" Copper 660 mg/kg 1.1E-06 (mg/kg/day) NA (mg/kg/day)" Iron 19200 mg/kg 3.2E-05 (mg/kg/day) NA (mg/kg/day)" Lead 71.4 mg/kg 0.0E+00 (mg/kg/day) NA (mg/kg/day)" Manganese 388 mg/kg 6.4E-07 (mg/kg/day) NA (mg/kg/day)" Thallium 2.13 mg/kg 3.5E-09 (mg/kg/day) NA (mg/kg/day)" Vanadium 23.6 mg/kg 3.9E-08 (mg/kg/day) NA (mg/kg/day)" Zinc 380 mg/kg 6.2E-07 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 8.5E-08 Exposure Point Total 1.2E-06 Exposure Medium Total 1.2E-06 Air OWR Inhalation Benzo(a)pyrene 7.8E-11 mg/m3 1.7E-11 (mg/m3) 6.0E-04 (ug/m3)"1 1.0E-11 Naphthalene 1.7E-04 mg/m3 1.4E-05 (mg/m3) 3.4E-05 (ug/m3)"1 4.6E-07 Dieldrin 3.4E-11 mg/m3 2.8E-12 (mg/m3) 4.6E-03 (ug/m3)"1 1.3E-11 Aluminum 3.1E-06 mg/m3 2.5E-07 (mg/m3) NA (ug/m3)"1 Antimony 2.0E-09 mg/m3 1.6E-10 (mg/m3) NA (ug/m3)"1 Arsenic 1.2E-09 mg/m3 1.0E-10 (mg/m3) 4.3E-03 (ug/m3)"1 4.3E-10 Cobalt 2.0E-09 mg/m3 1.6E-10 (mg/m3) 9.0E-03 (ug/m3)"1 1.4E-09 Copper 2.0E-07 mg/m3 1.7E-08 (mg/m3) NA (ug/m3)"1 Iron 5.9E-06 mg/m3 4.9E-07 (mg/m3) NA (ug/m3)"1 Lead 2.2E-08 mg/m3 1.8E-09 (mg/m3) NA (ug/m3)"1 Manganese 1.2E-07 mg/m3 9.9E-09 (mg/m3) NA (ug/m3)"1 Thallium 6.6E-10 mg/m3 5.4E-11 (mg/m3) NA (ug/m3)"1 Vanadium 7.3E-09 mg/m3 6.0E-10 (mg/m3) NA (ug/m3)"1 Zinc 1.2E-07 mg/m3 9.7E-09 (mg/m3) NA (ug/m3)"1 Exp. Route Total 4.6E-07 Exposure Point Total 4.6E-07 Exposure Medium Total 4.6E-07 Medium Total 1.6E-06 ------- TABLE 7.9.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Exposure Medium Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Ingestion 2-Butanone 2-Hexanone 1300 41 ug/L ug/L 2.7E-03 8.4E-05 (mg/kg/day) (mg/kg/day) NA NA (mg/kg/day)" (mg/kg/day)" Chloroform 9.4 ug/L 1.9E-05 (mg/kg/day) 3.1E-02 (mg/kg/day)" 6.0E-07 cis-1,2-Dichloroethene 1.88 ug/L 3.9E-06 (mg/kg/day) NA (mg/kg/day)" Methyl Tert-Butyl Ether 15 ug/L 3.1E-05 (mg/kg/day) 1.8E-03 (mg/kg/day)" 5.6E-08 Tetrachloroethene 65.7 ug/L 1.4E-04 (mg/kg/day) 2.1E-03 (mg/kg/day)" 2.8E-07 Trichloroethene (Mutagenic) 10.6 ug/L 8.6E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 8.0E-07 Trichloroethene (Nonmutagenic 10.6 ug/L 2.2E-05 (mg/kg/day) 3.7E-02 (mg/kg/day)" 8.1E-07 Vinyl Chloride 0.57 ug/L 1.8E-05 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.3E-05 1,4-Dioxane 3.84 ug/L 7.9E-06 (mg/kg/day) 1.0E-01 (mg/kg/day)" 7.9E-07 Bis(2-ethylhexyl)phthalate 11 ug/L 2.3E-05 (mg/kg/day) 1.4E-02 (mg/kg/day)" 3.2E-07 Caprolactam 2800 ug/L 5.8E-03 (mg/kg/day) NA (mg/kg/day)" Aluminum 57655 ug/L 1.2E-01 (mg/kg/day) NA (mg/kg/day)" Antimony 1.31 ug/L 2.7E-06 (mg/kg/day) NA (mg/kg/day)" Arsenic 12.8 ug/L 2.6E-05 (mg/kg/day) 1.5E+00 (mg/kg/day)" 4.0E-05 Barium 674 ug/L 1.4E-03 (mg/kg/day) NA (mg/kg/day)" Beryllium 3.46 ug/L 7.1E-06 (mg/kg/day) NA (mg/kg/day)" Cadmium 0.424 ug/L 8.7E-07 (mg/kg/day) NA (mg/kg/day)" Cobalt 63.9 ug/L 1.3E-04 (mg/kg/day) NA (mg/kg/day)" Copper 75.2 ug/L 1.5E-04 (mg/kg/day) NA (mg/kg/day)" Iron 45400 ug/L 9.4E-02 (mg/kg/day) NA (mg/kg/day)" Lead 23.1 ug/L 4.8E-05 (mg/kg/day) NA (mg/kg/day)" Manganese 2525 ug/L 5.2E-03 (mg/kg/day) NA (mg/kg/day)" Mercury 0.128 ug/L 2.6E-07 (mg/kg/day) NA (mg/kg/day)" Nickel 51.7 ug/L 1.1E-04 (mg/kg/day) NA (mg/kg/day)" Selenium 3.1 ug/L 6.4E-06 (mg/kg/day) NA (mg/kg/day)" Thallium 0.539 ug/L 1.1E-06 (mg/kg/day) NA (mg/kg/day)" Vanadium 12.3 ug/L 2.5E-05 (mg/kg/day) NA (mg/kg/day)" Zinc 378 ug/L 7.8E-04 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 5.6E-05 Dermal 2-Butanone 2-Hexanone 1300 41 ug/L ug/L 2.8E-05 3.8E-06 (mg/kg/day) (mg/kg/day) NA NA (mg/kg/day)" (mg/kg/day)" Chloroform 9.4 ug/L 1.6E-06 (mg/kg/day) 3.1E-02 (mg/kg/day)" 4.9E-08 cis-1,2-Dichloroethene 1.88 ug/L 4.3E-07 (mg/kg/day) NA (mg/kg/day)" Methyl Tert-Butyl Ether 15 ug/L 6.6E-07 (mg/kg/day) 1.8E-03 (mg/kg/day)" 1.2E-09 Tetrachloroethene 65.7 ug/L 7.5E-05 (mg/kg/day) 2.1E-03 (mg/kg/day)" 1.6E-07 Trichloroethene (Mutagenic) 10.6 ug/L 1.5E-05 (mg/kg/day) 9.3E-03 (mg/kg/day)" 1.4E-07 Trichloroethene (Nonmutagenic 10.6 ug/L 3.3E-06 (mg/kg/day) 3.7E-02 (mg/kg/day)" 1.2E-07 Vinyl Chloride 0.57 ug/L 1.6E-06 (mg/kg/day) 7.2E-01 (mg/kg/day)" 1.2E-06 1,4-Dioxane 3.84 ug/L 3.4E-08 (mg/kg/day) 1.0E-01 (mg/kg/day)" 3.4E-09 Bis(2-ethylhexyl)phthalate 11 ug/L 0.0E+00 (mg/kg/day) 1.4E-02 (mg/kg/day)" Caprolactam 2800 ug/L 8.8E-05 (mg/kg/day) NA (mg/kg/day)" Aluminum 57655 ug/L 5.1E-04 (mg/kg/day) NA (mg/kg/day)" Antimony 1.31 ug/L 1.2E-08 (mg/kg/day) NA (mg/kg/day)" Arsenic 12.8 ug/L 1.1E-07 (mg/kg/day) 1.5E+00 (mg/kg/day)" 1.7E-07 Barium 674 ug/L 6.0E-06 (mg/kg/day) NA (mg/kg/day)" Beryllium 3.46 ug/L 3.1E-08 (mg/kg/day) NA (mg/kg/day)" Cadmium 0.424 ug/L 3.8E-09 (mg/kg/day) NA (mg/kg/day)" Cobalt 63.9 ug/L 2.3E-07 (mg/kg/day) NA (mg/kg/day)" Copper 75.2 ug/L 6.7E-07 (mg/kg/day) NA (mg/kg/day)" Iron 45400 ug/L 4.0E-04 (mg/kg/day) NA (mg/kg/day)" Lead 23.1 ug/L 2.1E-08 (mg/kg/day) NA (mg/kg/day)" Manganese 2525 ug/L 2.2E-05 (mg/kg/day) NA (mq/kq/dav) Groundwater Groundwater ------- TABLE 7.9.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient Value Units Value Units Value Units Value Units Groundwater Groundwater OWRGC Dermal Mercury 0.128 ug/L 1.1E-09 (mg/kg/day) NA (mg/kg/day)" Nickel 51.7 ug/L 9.2E-08 (mg/kg/day) NA (mg/kg/day)" Selenium 3.1 ug/L 2.8E-08 (mg/kg/day) NA (mg/kg/day)" Thallium 0.539 ug/L 4.8E-09 (mg/kg/day) NA (mg/kg/day)" Vanadium 12.3 ug/L 1.1E-07 (mg/kg/day) NA (mg/kg/day)" Zinc 378 ug/L 2.0E-06 (mg/kg/day) NA (mg/kg/day)" Exp. Route Total 1.8E-06 Exposure Point Total 5.8E-05 Exposure Medium Total 5.8E-05 Air OWR Inhalation 2-Butanone 1.7E-02 mg/m3 1.4E-03 (mg/m3) NA (ug/m3)"1 2-Hexanone 6.5E-04 mg/m3 5.4E-05 (mg/m3) NA (ug/m3)"1 Chloroform 4.0E-04 mg/m3 3.3E-05 (mg/m3) 2.3E-05 (ug/m3)"1 7.6E-07 cis-1,2-Dichloroethene 8.7E-05 mg/m3 7.1E-06 (mg/m3) NA (ug/m3)"1 Methyl Tert-Butyl Ether 5.7E-04 mg/m3 4.7E-05 (mg/m3) 2.6E-07 (ug/m3)"1 1.2E-08 Tetrachloroethene 2.6E-03 mg/m3 2.1E-04 (mg/m3) 2.6E-07 (ug/m3)"1 5.5E-08 Trichloroethene (Mutagenic) 4.5E-04 mg/m3 5.3E-05 (mg/m3) 1.0E-06 (ug/m3)"1 5.3E-08 Trichloroethene (Nonmutagenic 4.5E-04 mg/m3 3.7E-05 (mg/m3) 3.1E-06 (ug/m3)"1 1.1E-07 Vinyl Chloride 3.2E-05 mg/m3 2.6E-06 (mg/m3) 4.4E-06 (ug/m3)"1 1.2E-08 1,4-Dioxane 4.8E-06 mg/m3 4.0E-07 (mg/m3) 5.0E-06 (ug/m3)"1 2.0E-09 Bis(2-ethylhexyl)phthalate 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-06 (ug/m3)"1 Caprolactam 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Aluminum 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Antimony 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Arsenic 0.0E+00 mg/m3 0.0E+00 (mg/m3) 4.3E-03 (ug/m3)"1 Barium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Beryllium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.4E-03 (ug/m3)"1 Cadmium 0.0E+00 mg/m3 0.0E+00 (mg/m3) 1.8E-03 (ug/m3)"1 Cobalt 0.0E+00 mg/m3 0.0E+00 (mg/m3) 9.0E-03 (ug/m3)"1 Copper 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Iron 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Lead 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Manganese 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Mercury 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Nickel 0.0E+00 mg/m3 0.0E+00 (mg/m3) 2.6E-04 (ug/m3)"1 Selenium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Thallium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Vanadium 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Zinc 0.0E+00 mg/m3 0.0E+00 (mg/m3) NA (ug/m3)"1 Exp. Route Total 1.0E-06 Exposure Point Total 1.0E-06 Exposure Medium Total 1.0E-06 Medium Total 5.9E-05 ------- TABLE 7.9.CTE CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 4 OF 4 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Exposure Route Chemical of EPC Cancer Risk Calculations Non-Cancer Hazard Calculations Potential Concern Value Units Intake/Exposure Concentration CSF/Unit Risk Cancer Risk Intake/Exposure Concentration RfD/RfC Hazard Quotient | Value Units Value Units Value Units Value Units Sediment Sediment OWR Ingestion Cobalt 14 mg/kg 2.5E-07 (mg/kg/day) NA (mg/kg/day)"1 [Nickel 1500 mg/kg 2.7E-05 (mg/kg/day) NA (mg/kg/day)"1 I Exp. Route Total | Dermal jCobalt 14 mg/kg 2.6E-09 (mg/kg/day) NA (mg/kg/day)"1 | Nickel 1500 mg/kg 2.7E-07 (mg/kg/day) NA (mg/kg/day)"1 Exp. Route Total jj Exposure Point Total Exposure Medium Total Medium Total Total of Receptor Risks Across All Media 6.1E-05 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- RAGS Part D Table 8 Calculation of Radiation Cancer Risks No tables, Radiation cancer risks were not evaluated for the Old Wilmington Road Site ------- RAGS Part D Table 9 Summary of Receptor Risks and Hazards for COPCs ------- LIST OF TABLES RAGS PART D TABLE 9 SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs Table No. Reasonable Maximum Exposures 9 1 .RME Current Industrial Workers 9.2.RME Current Child Residents 9 3 RME Current Adult Residents 9 4 RME Current Lifelong Residents 9 5 RME Future Construction Workers 9 6 RME Future Industrial Workers 9 7 RME Future Child Residents 9 8 RME Future Adult Residents 9 9 RME Future Lifelong Residents Central Tendency Exposures 9.1 CTE Current Industrial Workers 9 2 CTE Current Child Residents 9 3 CTE Current Adult Residents 9 4 CTE Current Lifelong Residents 9 5 CTE Future Construction Workers 9 6 CTE Future Industrial Workers 9 7 CTE Future Child Residents 9 8 CTE Future Adult Residents 9 9 CTE Future Lifelong Residents ------- TABLE 9.1.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Industrial Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene 8.7E-08 4.8E-08 1.4E-07 Developmental, Immune, Reproductive 0.00082 0.00045 0.0013 Naphthalene Body Weight 0.00042 0.00023 0.00065 Dieldrin 5.4E-07 2.3E-07 7.7E-07 Hepatic 0.0019 0.00080 0.0027 Aluminum Nervous 0.010 0.00043 0.011 Antimony Hematologic 0.024 0.0068 0.031 Arsenic 1.5E-06 3.1E-07 1.8E-06 Dermal, CVS 0.0090 0.0019 0.011 Cobalt Thyroid 0.022 0.00092 0.023 Copper GS 0.027 0.0011 0.028 Iron GS 0.025 0.0010 0.026 Lead NA Manganese Nervous 0.016 0.017 0.033 Vanadium Dermal 0.0046 » 0.0075 0.012 Zinc Hematologic, Immune 0.0020 - 0.000085 0.0021 Chemical Total 2.1E-06 5.8E-07 2.7E-06 0.14 - 0.039 0.18 Exposure Point Total 2.7E-06 0.18 Exposure Medium Total 2.7E-06 0.18 Air OWR Benzo(a)pyrene 4.3E-12 4.3E-12 Developmental, Reproductive 0.000010 0.000010 Naphthalene 4.6E-07 4.6E-07 Nervous, Respiratory 0.013 0.013 Dieldrin 1.3E-11 1.3E-11 NA Aluminum Nervous 0.00017 0.00017 Antimony NA Arsenic 5.7E-10 5.7E-10 NA 0.000025 0.000025 Cobalt 1.7E-09 1.7E-09 Respiratory 0.000089 0.000089 Copper NA Iron NA Lead NA Manganese Nervous 0.00064 0.00064 Vanadium - - - Respiratory » 0.000019 » 0.000019 Zinc - - - NA - - - - Chemical Total - 4.6E-07 - - 4.6E-07 0.014 0.014 Exposure Point Total 4.6E-07 0.014 Exposure Medium Total 4.6E-07 0.014 Vledium Total 3.1E-06 0.19 Receptor Total Receptor Risk Total 3.1E-06 Receptor HI Total 0.19 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.2.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene 1.7E-06 5.2E-07 2.2E-06 Developmental, Immune, Reproductive 0.012 0.0038 0.016 Naphthalene Body Weight 0.0063 0.0019 0.0082 Dieldrin 1.9E-06 4.6E-07 2.4E-06 Hepatic 0.028 0.0067 0.035 Aluminum Nervous 0.15 0.0036 0.16 Antimony Hematologic 0.36 0.057 0.42 Arsenic 5.2E-06 6.2E-07 5.8E-06 Dermal, CVS 0.14 0.016 0.15 Cobalt Thyroid 0.32 0.0077 0.33 Copper GS 0.40 0.0094 0.41 Iron GS 0.37 0.0088 0.38 Lead NA Manganese Nervous 0.24 0.14 0.39 Vanadium Dermal 0.069 » 0.063 0.13 Zinc Hematologic, Immune 0.030 - 0.00071 0.031 Chemical Total 8.8E-06 1.6E-06 1.0E-05 2.1 - 0.32 2.4 Exposure Point Total 1.0E-05 2.4 Exposure Medium Total 1.0E-05 2.4 Air OWR Benzo(a)pyrene 2.3E-11 2.3E-11 Developmental, Reproductive 0.000042 0.000042 Naphthalene 4.6E-07 4.6E-07 Nervous, Respiratory 0.053 0.053 Dieldrin 1.3E-11 1.3E-11 NA Aluminum Nervous 0.00071 0.00071 Antimony NA Arsenic 5.8E-10 5.8E-10 NA 0.00010 0.00010 Cobalt 1.7E-09 1.7E-09 Respiratory 0.00037 0.00037 Copper NA Iron NA Lead NA Manganese Nervous 0.0027 0.0027 Vanadium Respiratory 0.000080 » 0.000080 Zinc NA - - - Chemical Total 4.6E-07 4.6E-07 0.057 0.057 Exposure Point Total 4.6E-07 0.057 Exposure Medium Total 4.6E-07 0.057 Vledium Total 1.1E-05 2.5 Sediment Sediment OWR Cobalt Thyroid 0.09 - 0.00 0.09 Nickel Body Weight 0.14 - 0.085 0.23 Chemical Total 0.23 - 0.09 0.32 Exposure Point Total 0.32 Exposure Medium Total 0.32 Vledium Total 0.32 Receptor Total Receptor Risk Total 1.1E-05 Receptor HI Total 2.8 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI 0.2 Total CVS HI 0.2 Total Dermal HI 0.3 Total Developmental HI 0.02 Total GS HI 0.8 Total Hematologic HI 0.4 Total Hepatic HI 0.03 Total Immune HI 0.05 Total Nervous HI 0.6 Total Reproductive HI 0.02 Total Respiratory HI 0.05 Total Thyroid HI 0.4 ------- TABLE 9.3.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene 2.0E-07 1.1E-07 3.0E-07 Developmental, Immune, Reproductive 0.0011 0.00063 0.0018 Naphthalene Body Weight 0.00059 0.00032 0.00091 Dieldrin 6.0E-07 2.5E-07 8.6E-07 Hepatic 0.0026 0.0011 0.0038 Aluminum Nervous 0.014 0.00061 0.015 Antimony Hematologic 0.034 0.0095 0.043 Arsenic 1.6E-06 3.4E-07 2.0E-06 Dermal, CVS 0.013 0.0027 0.015 Cobalt Thyroid 0.030 0.0013 0.032 Copper GS 0.037 0.0016 0.039 Iron GS 0.035 0.0015 0.036 Lead NA Manganese Nervous 0.023 0.024 0.047 Vanadium Dermal 0.0065 » 0.011 0.017 Zinc Hematologic, Immune 0.0028 - 0.00012 0.0029 Chemical Total 2.4E-06 7.1E-07 3.1E-06 0.20 - 0.054 0.25 Exposure Point Total 3.1E-06 0.25 Exposure Medium Total 3.1E-06 0.25 Air OWR Benzo(a)pyrene 2.9E-11 2.9E-11 Developmental, Reproductive 0.000042 0.000042 Naphthalene 1.5E-06 1.5E-06 Nervous, Respiratory 0.053 0.053 Dieldrin 4.3E-11 4.3E-11 NA Aluminum Nervous 0.00071 0.00071 Antimony NA Arsenic 1.9E-09 1.9E-09 NA 0.00010 0.00010 Cobalt 5.8E-09 5.8E-09 Respiratory 0.00037 0.00037 Copper NA Iron NA Lead NA Manganese Nervous 0.0027 0.0027 Vanadium Respiratory 0.000080 » 0.000080 Zinc NA - - - Chemical Total 1.5E-06 1.5E-06 0.057 0.057 Exposure Point Total 1.5E-06 0.057 Exposure Medium Total 1.5E-06 0.057 Vledium Total 4.7E-06 0.31 Sediment Sediment OWR Cobalt Thyroid 0.008 - 0.000 0.009 Nickel Body Weight 0.013 - 0.014 0.027 Chemical Total 0.022 0.014 0.036 Exposure Point Total 0.036 Exposure Medium Total 0.036 Vledium Total 0.036 Receptor Total Receptor Risk Total 4.7E-06 Receptor HI Total 0.35 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.4.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Vanadium Zinc 1.9E-06 2.5E-06 6.8E-06 6.2E-07 7.1E-07 9.6E-07 2.5E-06 3.2E-06 7.8E-06 See Tables 9.2.RME and 9.3.RME for h azard Indices Chemical Total 1.1E-05 2.3E-06 1.4E-05 Exposure Point Total 1.4E-05 Exposure Medium Total 1.4E-05 Air OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Vanadium Zinc 5.2E-11 2.0E-06 5.6E-11 2.5E-09 7.5E-09 5.2E-11 2.0E-06 5.6E-11 2.5E-09 7.5E-09 Chemical Total - 2.0E-06 - - 2.0E-06 Exposure Point Total 2.0E-06 Exposure Medium Total 2.0E-06 Medium Total 1.6E-05 Sediment Sediment OWR Cobalt Nickel " |chemical Total - - Exposure Point Total | Exposure Medium Total Medium Total Receptor Total Receptor Risk Total 1.6E-05 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.5.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Taraet Oraan(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 1.0E-08 4.2E-09 1.4E-08 Developmental, Immune, Reproductive 0.0024 0.00099 0.0034 Naphthalene Nervous 0.000046 0.000019 0.000065 Dieldrin 7.1E-08 2.3E-08 9.4E-08 Hepatic 0.0031 0.0010 0.0041 Aluminum Nervous 0.028 0.00090 0.029 Antimony Hem atologic 0.046 0.0098 0.056 Arsenic 1.4E-07 2.3E-08 1.7E-07 Dermal, CVS 0.022 0.0036 0.026 Cobalt Thyroid 0.0060 0.00019 0.0061 Copper GS 0.047 0.0015 0.048 Iron GS 0.077 0.0025 0.080 Lead NA Manganese Nervous 0.046 0.037 0.082 Thallium Dermal 0.15 0.0048 0.16 Vanadium - Urinary 0.0067 0.0082 0.015 Zinc - Hematologic 0.0036 0.00011 0.0037 Chemical Total 2.2E-07 5.0E-08 - 2.7E-07 0.44 - 0.070 0.51 Exposure Point Total 2.7E-07 0.51 Exposure Me dium Total 2.7E-07 0.51 Air OWR Benzo(a)pyrene 3.5E-10 3.5E-10 Developmental, Reproductive - 0.021 0.021 Naphthalene 1.1E-07 1.1E-07 Nervous, Respiratory - 0.073 0.073 Dieldrin 1.2E-09 1.2E-09 NA Aluminum Nervous 0.32 0.32 Antimony NA Arsenic 4.0E-08 4.0E-08 NA 0.043 0.043 Cobalt 1.3E-07 1.3E-07 Respiratory 0.052 0.052 Copper NA Iron NA Lead NA Manganese Nervous 1.3 1.3 Thallium NA Vanadium - Respiratory - 0.038 - 0.038 Zinc - NA - - - Chemical Total - 2.8E-07 - - 2.8E-07 1.8 1.8 Exposure Point Total 2.8E-07 1.8 Exposure Me dium Total 2.8E-07 1.8 Vledium Total 5.5E-07 2.3 Groundwater Groundwater OWR 2-Butanone - - Developmental 5.1E-8 - 3.0E-8 8.1E-8 cis-1,2-Dichloroethene - - Urinary 0.0000080 - 0.000052 0.000060 Methyl tert-butyl ether 1.3E-12 1.6E-12 2.9E-12 NA Trichloroethene 9.1E-10 6.6E-09 7.5E-09 Immune, Developmental 0.0028 0.020 0.023 1,4-Dioxane 2.8E-10 5.6E-11 3.4E-10 Hepatic 0.00000039 7.9E-8 0.00000047 Caprolactam Urinary 0.00000038 0.00000024 0.00000062 Aluminum Nervous 0.0059 0.0033 0.0092 Antimony Hem atologic 0.000059 0.00022 0.00028 Arsenic 6.6E-08 3.7E-08 1.0E-07 Dermal, CVS 0.010 0.0058 0.016 Barium Urinary 0.00085 0.0069 0.0077 Beryllium None Reported 0.00018 0.015 0.015 Cadmium Urinary 0.000046 0.00052 0.00057 Cobalt Thyroid 0.00021 0.000047 0.00026 Copper GS 0.000051 0.000029 0.000080 Iron GS 0.0055 0.0031 0.0086 Lead NA Manganese Nervous 0.0022 0.031 0.033 Mercury Nervous 0.0000023 0.000019 0.000021 Nickel Body Weight 0.000041 0.00011 0.00016 Selenium Body Weight 0.000016 0.0000093 0.000026 Thallium Dermal 0.0030 0.0017 0.0046 Vanadium Urinary 0.00016 0.0034 0.0036 Zinc - Hematologic 0.000059 0.000020 0.000079 Chemical Total 6.7E-08 4.4E-08 - 1.1E-07 0.031 0.09 0.12 Exposure Point Total 1.1E-07 0.12 Exposure Medium Total 1.1E-07 0.12 ------- TABLE 9.5.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Taraet Oraan(s) Routes Total Groundwater Air OWR 2-Butanone Developmental - 0.00026 0.00026 cis-1,2-Dichloroethene NA Methyl tert-butyl ether 7.8E-10 7.8E-10 Hepatic, Urinary, Ocular 0.000070 0.000070 Trichloroethene 3.1E-07 3.1E-07 Immune, Developmental 2.7 2.7 1,4-Dioxane 4.9E-09 4.9E-09 Respiratory 0.000095 0.000095 Caprolactam Respiratory Aluminum Nervous Antimony NA Arsenic NA Barium Developmental Beryllium Immune, Respiratory Cadmium Urinary Cobalt Respiratory Copper NA Iron NA Lead NA Manganese Nervous Mercury Nervous Nickel Respiratory Selenium Respiratory Thallium NA Vanadium Respiratory Zinc NA » » » » Chemical Total 3.2E-07 - 3.2E-07 2.7 2.7 Exposure Point Total 3.2E-07 2.7 Exposure Medium Total 3.2E-07 2.7 Vledium Total 4.3E-07 2.8 Receptor Total Receptor Risk Total 9.9E-07 Receptor HI Total 5.1 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI Total CVS HI Total Dermal HI Total Developmental HI Total GS HI Total Hematologic HI Total Hepatic HI Total Immune HI Total Nervous HI Total None Reported HI Total Reproductive HI Total Respiratory HI Total Thyroid HI Total Urinary HI Total Ocular HI ------- TABLE 9.6.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 7.7E-08 - 4.2E-08 - 1.2E-07 Developmental, Immune, Reproductive 0.00072 0.00040 0.0011 Naphthalene Body Weight 0.00042 0.00023 0.00065 Dieldrin 5.4E-07 2.3E-07 7.7E-07 Hepatic 0.0019 0.00080 0.0027 Aluminum Nervous 0.009 0.00036 0.009 Antimony Hematologic 0.014 0.0039 0.018 Arsenic 1.1E-06 2.3E-07 1.3E-06 Dermal, CVS 0.0068 0.0014 0.008 Cobalt Thyroid 0.018 0.00076 0.019 Copper GS 0.014 0.0006 0.015 Iron GS 0.023 0.0010 0.024 Lead NA Manganese Nervous 0.014 0.015 0.028 Thallium -- - - Dermal 0.18 0.0077 0.19 Vanadium -- - - Dermal 0.0040 0.0066 0.011 Zinc - - Hematologic, Immune 0.0011 - 0.000046 0.0011 Chemical Total 1.7E-06 - 5.0E-07 - 2.2E-06 0.29 - 0.038 0.33 Exposure Point Total 2.2E-06 0.33 Exposure IV edium Total 2.2E-06 0.33 Air OWR Benzo(a)pyrene 4E-12 4E-12 Developmental, Reproductive 0.000009 - 0.000009 Naphthalene 5E-07 5E-07 Nervous, Respiratory 0.013 - 0.013 Dieldrin 1E-11 1E-11 NA Aluminum Nervous 0.00014 0.00014 Antimony NA - Arsenic 4E-10 4E-10 NA 0.000019 0.000019 Cobalt 1E-09 1E-09 Respiratory 0.000074 0.000074 Copper NA Iron NA Lead NA Manganese Nervous 0.00055 0.00055 Thallium NA Vanadium Respiratory 0.000017 0.000017 Zinc - NA Chemical Total 4.6E-07 - - 4.6E-07 0.013 0.013 Exposure Point Total 4.6E-07 0.013 Exposure Medium Total 4.6E-07 0.013 Vledium Total 2.7E-06 0.34 ------- TABLE 9.6.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Groundwater OWR 2-Butanone 2-Hexanone -- - - Developmental Nervous 0.023 0.088 0.000039 0.00064 0.023 0.088 Chloroform 1.1E-06 1.2E-08 1.1E-06 Hepatic 0.010 0.00011 0.010 cis-1,2-Dichloroethene Urinary 0.010 0.00015 0.010 Vlethyl Tert-Butyl Ether 1.0E-07 3.1E-10 1.0E-07 NA Tetrachloroethene 5.3E-07 4.1E-08 5.7E-07 Nervous, Ocular 0.12 0.009 0.13 Trichloroethene 1.9E-06 3.8E-08 1.9E-06 Immune, Developmental 0.23 0.0047 0.23 Vinyl Chloride 1.6E-06 1.2E-08 1.6E-06 Hepatic 0.0020 0.000015 0.0020 1,4-Dioxane 1.5E-06 1.1E-09 1.5E-06 Hepatic, Urinary 0.0014 0.0000010 0.0014 Bis(2-ethylhexyl)phthalate 5.9E-07 5.9E-07 Hepatic 0.0059 0.0059 Caprolactam Developmental 0.060 0.00016 0.060 Aluminum Nervous 0.62 0.00044 0.62 Antimony Hematologic 0.035 0.00016 0.035 Arsenic 7.3E-05 5.2E-08 7.3E-05 Dermal, CVS 0.46 0.00032 0.46 Barium Urinary 0.036 0.00036 0.036 Beryllium GS 0.019 0.0019 0.020 Cadmium Urinary 0.0091 0.00013 0.0092 Cobalt Thyroid 2.3 0.00064 2.3 Copper GS 0.020 0.000014 0.020 Iron GS 0.69 0.00049 0.69 Lead NA Vlanganese Nervous 1.1 0.020 1.1 Vlercury Immune, Urinary 0.0046 0.000046 0.0046 Mickel Body Weight 0.028 0.000098 0.028 Selenium Hematologic, Dermal, Nervous 0.0066 0.0000047 0.0066 Thallium -- - - Dermal 0.58 0.00041 0.58 Vanadium -- - - Dermal 0.026 0.00071 0.027 Zinc -- - - Hematologic, Immune 0.013 0.0000057 0.013 Chemical Total 8.1E-05 - 1.6E-07 - 8.1E-05 6.5 0.040 6.5 Exposure Point Total 8.1E-05 6.5 Exposure Medium Total 8.1E-05 6.5 ------- TABLE 9.6.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Groundwater Air OWR 2-Butanone - - Developmental, Musculosketal 0.0023 0.0023 2-Hexanone Nervous 0.015 0.015 Chloroform 2.2E-06 2.2E-06 Hepatic 0.0028 0.0028 cis-1,2-Dichloroethene NA Vlethyl Tert-Butyl Ether 3.6E-08 3.6E-08 Hepatic, Urinary, Ocular 0.00013 0.00013 Tetrachloroethene 1.6E-07 1.6E-07 Nervous, Ocular 0.044 0.044 Trichloroethene 4.5E-07 4.5E-07 Immune, Developmental 0.15 0.15 Vinyl Chloride 3.4E-08 3.4E-08 Hepatic 0.00022 0.00022 1,4-Dioxane 5.9E-09 5.9E-09 Nervous, Respiratory 0.00011 0.00011 Bis(2-ethylhexyl)phthalate NA Caprolactam Respiratory Aluminum Nervous Antimony NA Arsenic NA Barium Developmental Beryllium Immune, Respiratory Cadmium Urinary Cobalt Respiratory Copper NA Iron NA Lead NA Vlanganese Nervous Vlercury Nervous Mickel Respiratory Selenium Respiratory Thallium - - NA » » » » Vanadium - - Respiratory - - - - Zinc - - NA - - - - Chemical Total 2.9E-06 - - 2.9E-06 0.22 0.22 Exposure Point Total 2.9E-06 0.22 Exposure Medium Total 2.9E-06 0.22 Vledium Total 8.4E-05 6.7 Receptor Total Recep or Risk Total 8.6E-05 Receptor HI Total 7.1 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI 0.028 Total CVS HI 0.47 Total Dermal HI 1.3 Total Developmental HI 0.47 Total GS HI 0.77 Total Hematologic HI 0.074 Total Hepatic HI 0.025 Total Immune HI 0.41 Total Nervous HI 2.1 Total Respiratory HI 0.013 Total Thyroid HI 2.3 Total Urinary HI 0.062 Total Ocular HI 0.17 Total Reproductive HI 0.0011 ------- TABLE 9.7.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 2 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) RoutesTotal Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 1.5E-06 - 4.5E-07 - 1.9E-06 Developmental, Immune, Reproductive 0.011 - 0.0033 0.014 Naphthalene - Body Weight 0.0063 0.0019 0.0082 Dieldrin 1.9E-06 4.6E-07 2.4E-06 Hepatic 0.028 - 0.0067 0.035 Aluminum - Nervous 0.13 0.0030 0.13 Antimony - - Hematologic 0.21 0.033 0.24 Arsenic 3.9E-06 - 4.6E-07 4.4E-06 Dermal, CVS 0.10 - 0.012 0.11 Cobalt Thyroid 0.27 0.0064 0.28 Copper GS 0.21 0.0050 0.22 Iron - GS 0.35 0.0083 0.36 Lead - NA - Manganese - Nervous 0.21 0.12 0.33 Thallium Dermal 2.7 0.065 2.8 Vanadium -- - - Dermal 0.060 - 0.055 0.12 Zinc -- - Hematologic, Immune 0.016 0.00038 0.017 Chemical Total 7.3E-06 1.4E-06 - 8.7E-06 4.3 0.32 4.6 Exposure Point Total 8.7E-06 4.6 Exposure Medium Total 8.7E-06 4.6 Air OWR Benzo(a)pyrene 2.0E-11 - 2.0E-11 Developmental, Reproductive 0.000037 - 0.000037 Naphthalene - 4.6E-07 - - 4.6E-07 Nervous, Respiratory - 0.053 - 0.053 Dieldrin 1.3E-11 1.3E-11 NA - - - - Aluminum - Nervous 0.00059 - 0.00059 Antimony - - - NA - - - - Arsenic - 4.3E-10 - - 4.3E-10 NA 0.000078 - 0.000078 Cobalt 1.4E-09 1.4E-09 Respiratory - 0.00031 - 0.00031 Copper - - - NA - - - - Iron - - NA - Lead - - - NA - - - - Manganese - - - Nervous 0.0023 0.0023 Thallium - - - NA - - - - Vanadium - - - Respiratory - 0.000070 - 0.000070 Zinc - - - NA - - - - Chemical Total - 4.6E-07 - - 4.6E-07 0.056 0.056 Exposure Point Total 4.6E-07 0.056 Exposure Medium Total 4.6E-07 0.056 Medium Total 9.1E-06 4.7 ------- TABLE 9.7.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 2 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure RoutesTotal Primary Tarqet Orqan(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Groundwater OWR 2-Butanone 2-Hexanone " Developmental Nervous 0.11 0.41 " 0.00089 0.015 0.11 0.42 Chloroform 1.2E-06 9.9E-08 1.3E-06 Hepatic 0.047 - 0.0037 0.051 cis-1,2-Dichloroethene - - Urinary 0.047 0.0052 0.052 Methyl Tert-Butyl Ether 1.2E-07 - 2.3E-09 - 1.2E-07 NA - - - - Tetrachloroethene 5.9E-07 - 3.1E-07 - 9.0E-07 Nervous, Ocular 0.55 - 0.29 0.83 Trichloroethene (Mutagenic) 2.2E-06 - 3.3E-07 - 2.6E-06 NA - - - - Trichloroethene (Nonmutagenic) 1.7E-06 - 2.4E-07 1.9E-06 Immune, Developmental 1.1 - 0.15 1.2 Vinyl Chloride 2.3E-05 - 1.6E-06 - 2.5E-05 Hepatic 0.0095 - 0.00064 0.010 1,4-Dioxane 1.6E-06 - 5.2E-09 - 1.6E-06 Hepatic, Urinary 0.0064 - 0.000020 0.0064 Bis(2-ethylh exy I )phthalate 6.6E-07 - - 6.6E-07 Hepatic 0.027 - - 0.027 Caprolactam - Developmental 0.28 0.0031 0.28 Aluminum - Nervous 2.9 0.013 2.9 Antimony - - Hematologic 0.16 0.0048 0.17 Arsenic 8.2E-05 - 3.6E-07 8.2E-05 Dermal, CVS 2.1 - 0.0094 2.1 Barium - - Urinary 0.17 - 0.011 0.18 Beryllium - - GS 0.086 - 0.054 0.14 Cadmium - - Urinary 0.042 - 0.0037 0.046 Cobalt - - Thyroid 10.6 - 0.019 11 Copper - - GS 0.094 - 0.000413 0.094 Iron - - GS 3.2 - 0.014 3.2 Lead - - NA - - - - Manganese - - Nervous 5.2 - 0.58 5.8 Mercury - - Immune, Urinary 0.021 - 0.0013 0.023 Nickel - - Body Weight 0.13 - 0.0028 0.13 Selenium - - Hematologic, Dermal, Nervous 0.031 - 0.00014 0.031 Thallium - - Dermal 2.7 - 0.012 2.7 Vanadium -- - - Dermal 0.12 - 0.021 0.14 Zinc -- - - Hematologic, Immune 0.063 - 0.00017 0.063 Chemical Total 1.1E-04 - 2.9E-06 - 1.2E-04 30.2 - 1.2 31 Exposure Point Total 1.2E-04 31 Exposure to edium Total 1.2E-04 31 Medium Total 1.2E-04 31 Sediment Sediment OWR Cobalt -- - - Thyroid 0.09 - 0.002 0.09 Nickel -- - - Body Weight 0.14 - 0.085 0.23 Chemical Total - - 0.23 - 0.09 0.32 Exposure Point Total 0.32 Exposure to edium Total 0.32 Medium Total 0.32 Receptor Total Receptor Risk Total 1.3E-04 Receptor HI Total 36 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI Total CVS HI Total Dermal HI Total Developmental HI Total GS HI Total Hematologic HI Total Hepatic HI Total Immune HI Total Nervous HI Total Respiratory HI Total Thyroid HI Total Urinary HI Total Ocular HI Total Reproductive HI ------- TABLE 9.8.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 1.7E-07 - 9.5E-08 - 2.7E-07 Developmental, Immune, Reproductive 0.0010 0.00055 0.0016 Naphthalene - - Body Weight 0.00059 0.00032 0.00091 Dieldrin 6.0E-07 - 2.5E-07 - 8.6E-07 Hepatic 0.0026 - 0.0011 0.0038 Aluminum Nervous 0.012 0.00050 0.012 Antimony - - Hematologic 0.019 0.0055 0.025 Arsenic 1.2E-06 - 2.6E-07 1.5E-06 Dermal, CVS 0.0095 - 0.0020 0.011 Cobalt - - Thyroid 0.025 - 0.0011 0.026 Copper GS 0.020 0.00084 0.021 Iron GS 0.033 0.0014 0.034 Lead - - NA - - - - Manganese - - Nervous 0.019 0.020 0.040 Thallium - - Dermal 0.26 - 0.011 0.27 Vanadium Dermal 0.0057 0.0092 0.015 Zinc Hematologic, Immune 0.0015 - 0.000064 0.0016 Chemical Total 2.0E-06 - 6.1E-07 2.6E-06 0.40 0.054 0.46 Exposure Point Total 2.6E-06 0.46 Exposure Medium Total 2.6E-06 0.46 Air OWR Benzo(a)pyrene 2.6E-11 3E-11 Developmental, Reproductive 0.000037 - 0.000037 Naphthalene - 1.5E-06 - - 2E-06 Nervous, Respiratory - 0.053 - 0.053 Dieldrin 4.3E-11 - - 4E-11 NA - - - - Aluminum - - - Nervous 0.00059 - 0.00059 Antimony - - - NA - - - - Arsenic - 1.4E-09 - 1E-09 NA - 0.000078 - 0.000078 Cobalt - 4.8E-09 - - 5E-09 Respiratory - 0.00031 - 0.00031 Copper - - - NA - - - - Iron - - - NA - - - Lead - - - NA - - - - Manganese - - - Nervous 0.0023 - 0.0023 Thallium - - - NA - - - - Vanadium - - - Respiratory - 0.000070 - 0.000070 Zinc - - - NA - - - Chemical Total - 1.5E-06 - - 1.5E-06 0.056 0.056 Exposure Point Total 1.5E-06 0.056 Exposure Medium Total 1.5E-06 0.056 Medium Total 4.1E-06 0.51 (Scenario timeframe: Future eceptor Population: Residents eceptorAqe: Adult ------- TABLE 9.8.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Groundwater Groundwater OWR 2-Butanone - - Developmental 0.065 - 0.00054 0.065 2-Hexanone - - Nervous 0.25 0.0084 0.25 Chloroform 2.5E-06 - 1.3E-07 - 2.6E-06 Hepatic 0.028 - 0.0015 0.030 cis-1,2-Dichloroethene - - Urinary 0.028 - 0.0019 0.030 Methyl Tert-Butyl Ether 2.3E-07 - 3.3E-09 - 2.3E-07 NA - - - Tetrachloroethene 1.2E-06 - 4.3E-07 - 1.6E-06 Nervous, Ocular 0.33 - 0.12 0.45 Trichloroethene (Mutagenic) 1.7E-06 - 1.6E-07 - 1.9E-06 NA - - - - Trichloroethene (Nonmutagenic) 3.4E-06 - 3.2E-07 - 3.7E-06 Immune, Developmental 0.64 - 0.06 0.70 Vinyl Chloride 3.5E-06 - 1.3E-07 - 3.6E-06 Hepatic 0.0057 - 0.00021 0.0059 1,4-Dioxane 3.3E-06 - 1.1E-08 - 3.3E-06 Hepatic, Urinary 0.0038 0.000013 0.0038 Bis(2-ethylh exy I )phthalate 1.3E-06 - - 1.3E-06 Hepatic 0.016 - - 0.016 Caprolactam - - Developmental 0.17 - 0.0021 0.17 Aluminum - - Nervous 1.7 - 0.0096 1.7 Antimony - - Hematologic 0.098 0.0037 0.10 Arsenic 1.6E-04 - 9.2E-07 - 1.7E-04 Dermal, CVS 1.3 - 0.0071 1.3 Barium - - Urinary 0.10 - 0.0081 0.11 Beryllium - - GS 0.052 - 0.041 0.093 Cadmium - - Urinary 0.025 - 0.0028 0.028 Cobalt - - Thyroid 6.4 0.014 6.4 Copper GS 0.056 0.00031 0.057 Iron - - GS 1.9 0.011 2.0 Lead - - NA - - - - Manganese Nervous 3.2 0.44 3.6 Mercury Immune, Urinary 0.013 0.0010 0.014 Nickel - - Body Weight 0.077 0.0022 0.080 Selenium - - Hematologic, Dermal, Nervous 0.019 0.00010 0.019 Thallium - - Dermal 1.6 - 0.0090 1.6 Vanadium - - Dermal 0.074 - 0.016 0.090 Zinc Hematologic, Immune 0.038 0.00013 0.038 Chemical Total 1.8E-04 - 2.1E-06 - 1.8E-04 18 - 0.8 19 Exposure Point Total 1.8E-04 19 Exposure K edium Total 1.8E-04 19 (Scenario timeframe: Future eceptor Population: Residents eceptorAqe: Adult ------- TABLE 9.8.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Air OWR 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylhexyl)phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Vanadium Zinc - 3.3E-05 5.3E-07 2.4E-06 3.2E-06 4.9E-06 5.0E-07 8.6E-08 - " 3.3E-05 5.3E-07 2.4E-06 3.2E-06 4.9E-06 5.0E-07 8.6E-08 Developmental, Musculosketal Nervous Hepatic NA Hepatic, Urinary, Ocular Nervous, Ocular NA Hepatic, Urinary Hepatic Nervous, Respiratory NA Respiratory Nervous NA NA Developmental Immune, Respiratory Urinary Respiratory NA NA NA Nervous Nervous Respiratory Respiratory NA Respiratory NA " 0.042 0.27 0.051 0.0024 0.79 2.8 0.0040 0.0020 " 0.042 0.27 0.051 0.0024 0.79 2.8 0.0040 0.0020 Chemical Total 4.4E-05 4.4E-05 3.9 3.9 Exposure Point Total 4.4E-05 3.9 Exposure Medium Total 4.4E-05 3.9 Medium Total 2.3E-04 23 Sediment Sediment OWR Cobalt Thyroid 0.008 0.000 0.009 Nickel - - Body Weight 0.013 - 0.014 0.027 IjChemical Total - - 0.022 - 0.014 0.036 Exposure Point Total 0.036 Exposure Medium Total 0.036 Medium Total 0.036 Receptor Total Receptor Risk Total 2.3E-04 Receptor HI Total 23 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI 0.11 Total CVS HI 1.3 Total Dermal HI 3.3 Total Developmental HI 1.0 Total GS HI 2.2 Total Hematologic HI 0.18 Total Hepatic HI 2.9 Total Immune HI 0.75 Total Nervous HI 7.2 Total Respiratory HI 0.055 Total Thyroid HI 6.4 Total Urinary HI 3.0 Total Ocular HI 1.2 (Scenario Timeframe: Future eceptor Population: Residents eceptorAqe: Adult ------- TABLE 9.9.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Thallium Vanadium Zinc 1.6E-06 2.5E-06 5.1E-06 " 5.5E-07 7.1E-07 7.2E-07 " 2.2E-06 3.2E-06 5.8E-06 Chemical Total 9.3E-06 - 2.0E-06 - 1.1E-05 Exposure Point Total 1.1E-05 Exposure Medium Total 1.1E-05 Air OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Thallium Vanadium Zinc - 4.6E-11 2.0E-06 5.6E-11 1.9E-09 6.3E-09 - - 5E-11 2E-06 6E-11 2E-09 6E-09 Chemical Total - 2.0E-06 - - 2.0E-06 Exposure Point Total 2.0E-06 Exposure Medium Total 2.0E-06 Medium Total 1.3E-05 ------- TABLE 9.9.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk External (Radiation) Exposure Routes Total Non-Carcinogenic Hazard Quotient Primary Target Organ(s) Exposure Point Total Expt 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylh exy I )phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Vanadium Zinc 3.5E-07 1.8E-06 3.9E-06 5.0E-06 2.7E-05 4.9E-06 2.0E-06 5.6E-09 7.4E-07 4.9E-07 5.7E-07 1.7E-06 1.6E-08 Chemical Total 3.5E-07 2.5E-06 4.4E-06 5.6E-06 2.8E-05 4.9E-06 2.0E-06 'Osure Medium Total Exposure Routes Total ------- TABLE 9.9.RME SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Orqan(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Air OWR 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylh exy I )phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Vanadium Zinc " 3.3E-05 5.3E-07 2.4E-06 3.2E-06 4.9E-06 5.0E-07 8.6E-08 " " 3.3E-05 5.3E-07 2.4E-06 3.2E-06 4.9E-06 5.0E-07 8.6E-08 Chemical Total - 4.4E-05 - - 4.4E-05 Exposure Point Total 4.4E-05 Exposure Medium Total 4.4E-05 Medium Total 3.4E-04 Sediment Sediment OWR Cobalt Nickel Chemical Total - - Exposure Point Total Exposure Medium Total Medium Total Receptor Total Receptor Risk Total 3.6E-04 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.1.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Industrial Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene 1.1E-08 - 2.0E-09 - 1.3E-08 Developmental, Immune, Reproductive 0.00036 0.000066 0.00042 Naphthalene Body Weight 0.00018 0.000034 0.00022 Dieldrin 6.6E-08 9.3E-09 7.5E-08 Hepatic 0.00083 0.00012 0.00094 Aluminum Nervous 0.0045 0.000063 0.0046 Antimony Hematologic 0.011 0.00100 0.012 Arsenic 1.8E-07 1.3E-08 1.9E-07 Dermal, CVS 0.0040 0.00028 0.0042 Cobalt Thyroid 0.0095 0.00013 0.0096 Copper GS 0.012 0.00016 0.012 Iron GS 0.011 0.00015 0.011 Lead NA Vlanganese Nervous 0.0071 0.0025 0.0096 Vanadium -- - - Dermal 0.0020 » 0.0011 0.0031 Zinc -- - - Hematologic, Immune 0.00088 - 0.000012 0.00089 Chemical Total 2.5E-07 - 2.4E-08 - 2.8E-07 0.062 - 0.0056 0.068 Exposure Point Total 2.8E-07 0.068 Exposure Medium Total 2.8E-07 0.068 Air OWR Benzo(a)pyrene 1.1E-12 - - 1.1E-12 Developmental, Reproductive 0.0000088 0.0000088 Naphthalene 1.1E-07 1.1E-07 Nervous, Respiratory 0.011 0.011 Dieldrin 3.1E-12 3.1E-12 NA - Aluminum Nervous 0.00015 0.00015 Antimony NA Arsenic 1.4E-10 1.4E-10 NA 0.000022 0.000022 Cobalt 4.2E-10 4.2E-10 Respiratory 0.000078 0.000078 Copper NA - Iron NA Lead NA Vlanganese Nervous 0.00056 0.00056 Vanadium - - - Respiratory 0.000017 » 0.000017 Zinc - - - NA - - Chemical Total - 1.1E-07 - - 1.1E-07 0.012 0.012 Exposure Point Total 1.1E-07 0.012 Exposure Medium Total 1.1E-07 0.012 Vledium Total 3.9E-07 0.080 Receptor Total Receptor Risk Total 3.9E-07 Receptor HI Total 0.080 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.2.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene 2.3E-07 - 2.8E-08 - 2.6E-07 Developmental, Immune, Reproductive 0.0041 0.00050 0.0046 Naphthalene Body Weight 0.0021 0.00026 0.0024 Dieldrin 2.1E-07 2.0E-08 2.4E-07 Hepatic 0.0094 0.00089 0.010 Aluminum Nervous 0.051 0.00049 0.052 Antimony Hematologic 0.12 0.0076 0.13 Arsenic 5.8E-07 2.8E-08 6.1E-07 Dermal, CVS 0.045 0.0021 0.047 Cobalt Thyroid 0.11 0.0010 0.11 Copper GS 0.13 0.0013 0.13 Iron GS 0.12 0.0012 0.12 Lead NA Vlanganese Nervous 0.081 0.019 0.10 Vanadium -- - - Dermal 0.023 » 0.0084 0.032 Zinc -- - - Hematologic, Immune 0.010 - 0.000095 0.010 Chemical Total 1.0E-06 - 7.6E-08 - 1.1E-06 0.71 - 0.043 0.75 Exposure Point Total 1.1E-06 0.75 Exposure Medium Total 1.1E-06 0.75 Air OWR Benzo(a)pyrene 6.3E-12 - - 6.3E-12 Developmental, Reproductive 0.000028 0.000028 Naphthalene 1.0E-07 1.0E-07 Nervous, Respiratory 0.035 0.035 Dieldrin 2.9E-12 2.9E-12 NA Aluminum Nervous 0.00047 0.00047 Antimony NA Arsenic 1.3E-10 1.3E-10 NA 0.000070 0.000070 Cobalt 3.9E-10 3.9E-10 Respiratory 0.00025 0.00025 Copper NA Iron NA Lead NA Manganese Nervous 0.0018 0.0018 Vanadium - - Respiratory 0.000053 » 0.000053 Zinc - - NA - - Chemical Total 1.0E-07 - - 1.0E-07 0.038 0.038 Exposure Point Total 1.0E-07 0.038 Exposure Medium Total 1.0E-07 0.038 Vledium Total 1.2E-06 0.79 Sediment Sediment OWR Cobalt -- - - Thyroid 0.022 0.000 0.022 Nickel -- - - Body Weight 0.036 0.0085 0.044 |chemical Total -- - - 0.058 0.009 0.07 Exposure Point Total 0.07 EE Exposure Medium Total 0.07 Vledium Total 0.07 Receptor Total Recep or Risk Total 1.2E-06 Receptor HI Total 0.86 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.3.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene 1.8E-08 2.8E-09 2.1E-08 Developmental, Immune, Reproductive 0.00038 0.000060 0.00044 Naphthalene Body Weight 0.00020 0.000031 0.00023 Dieldrin 7.1E-08 8.5E-09 7.9E-08 Hepatic 0.00088 0.00011 0.00099 Aluminum Nervous 0.0048 0.000058 0.0049 Antimony Hematologic 0.011 0.00091 0.012 Arsenic 1.9E-07 1.1E-08 2.0E-07 Dermal, CVS 0.0042 0.00026 0.0045 Cobalt Thyroid 0.010 0.00012 0.010 Copper GS 0.012 0.00015 0.013 Iron GS 0.012 0.00014 0.012 Lead NA Manganese Nervous 0.0076 0.0023 0.0099 Vanadium Dermal 0.0022 - 0.0010 0.0032 Zinc - Hematologic, Immune 0.00094 - 0.000011 0.00095 Chemical Total 2.8E-07 2.3E-08 - 3.0E-07 0.067 - 0.0051 0.072 Exposure Point Total 3.0E-07 0.072 Exposure Medium Total 3.0E-07 0.072 Air OWR Benzo(a)pyrene 5.3E-12 5.3E-12 Developmental, Reproductive - 0.000028 0.000028 Naphthalene 3.6E-07 3.6E-07 Nervous, Respiratory 0.035 0.035 Dieldrin 1.0E-11 1.0E-11 NA Aluminum Nervous 0.00047 0.00047 Antimony NA Arsenic 4.5E-10 4.5E-10 NA 0.000070 0.000070 Cobalt 1.4E-09 1.4E-09 Respiratory - 0.00025 0.00025 Copper NA Iron NA Lead NA Manganese Nervous 0.0018 0.0018 Vanadium Respiratory » 0.000053 » 0.000053 Zinc NA - - - - Chemical Total 3.6E-07 3.6E-07 0.038 0.038 Exposure Point Total 3.6E-07 0.038 Exposure Medium Total 3.6E-07 0.038 Vledium Total 6.6E-07 0.11 Sediment Sediment OWR Cobalt Thyroid 0.0021 - 0.0000 0.0021 Nickel Body Weight 0.0033 - 0.0010 0.0043 Chemical Total 0.0054 - 0.0010 0.006 Exposure Point Total 0.006 Exposure Medium Total 0.006 Vledium Total 0.006 Receptor Total Receptor Risk Total 6.6E-07 ReceptorHI Total 0.12 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.4.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface Soil Surface Soil OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Vanadium Zinc 2.5E-07 2.9E-07 7.7E-07 3.1E-08 2.9E-08 3.9E-08 2.8E-07 3.1E-07 8.1E-07 See Tables 9.2.CTE and 9.3.CTE for Hazard Indices Chemical Total 1.3E-06 9.9E-08 -- 1.4E-06 Exposure Point Total 1.4E-06 Exposure Medium Total 1.4E-06 Air OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Vanadium Zinc 1.2E-11 4.6E-07 1.3E-11 5.8E-10 1.7E-09 1.2E-11 4.6E-07 1.3E-11 5.8E-10 1.7E-09 Chemical Total 4.6E-07 4.6E-07 Exposure Point Total 4.6E-07 Exposure Medium Total 4.6E-07 Vledium Total 1.9E-06 Sediment Sediment OWR Cobalt Nickel Chemical Total Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total 1.9E-06 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 9.5.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Orqan(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 2.5E-09 - 7.1E-10 3.2E-09 Developmental, Immune, Reproductive 0.00059 - 0.00016 0.00076 Naphthalene Nervous 0.000012 0.0000032 0.000015 Dieldrin 1.8E-08 3.8E-09 2.2E-08 Hepatic 0.00078 0.00017 0.00094 Aluminum Nervous 0.0070 0.00015 0.0072 Antimony Hematologic 0.011 0.0016 0.013 Arsenic 3.6E-08 3.8E-09 4.0E-08 Dermal, CVS 0.0056 0.00060 0.0062 Cobalt Thyroid 0.0015 0.000032 0.0015 Copper GS 0.012 0.00025 0.012 Iron GS 0.019 0.00041 0.020 Lead NA - Manganese Nervous 0.011 0.0061 0.018 Thallium - -- - Dermal 0.038 - 0.00080 0.038 Vanadium - -- - Urinary 0.0017 - 0.0014 0.0030 Zinc - - Hematologic 0.00089 - 0.000019 0.00091 Chemical Total 5.6E-08 - 8.3E-09 - 6.5E-08 0.11 - 0.012 0.12 Exposure Point Total 6.5E-08 0.12 Exposure IV edium Total 6.5E-08 0.12 Air OWR Benzo(a)pyrene 1.8E-10 1.8E-10 Developmental, Reproductive - 0.010 0.010 Naphthalene 5.3E-08 5.3E-08 Nervous, Respiratory - 0.036 0.036 Dieldrin 5.9E-10 5.9E-10 NA - Aluminum Nervous - 0.16 0.16 Antimony NA - Arsenic 2.0E-08 2.0E-08 NA - 0.021 0.021 Cobalt 6.6E-08 6.6E-08 Respiratory - 0.026 0.026 Copper NA - Iron NA - Lead - NA - - Manganese Nervous - 0.63 0.63 Thallium - NA - - Vanadium Respiratory - 0.019 0.019 Zinc - NA - - - - Chemical Total 1.4E-07 - - 1.4E-07 0.91 0.91 Exposure Point Total 1.4E-07 0.91 Exposure Medium Total 1.4E-07 0.91 Vledium Total 2.0E-07 1.0 ------- TABLE 9.5.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Groundwater OWR 2-Butanone cis-1,2-Dichloroethene Methyl tert-butyl ether 1.3E-12 8.6E-13 2.1E-12 Developmental Urinary NA 5.1 E-8 0.0000080 1.6E-8 0.000028 6.7E-8 0.000036 Trichloroethene 9.1E-10 3.7E-09 4.6E-09 Immune, Developmental 0.0028 0.011 0.014 1,4-Dioxane 2.8E-10 3.0E-11 3.1E-10 Hepatic 0.00000039 4.3E-8 0.00000043 Caprolactam Urinary 0.00000038 0.00000013 0.00000051 Aluminum Nervous 0.0059 0.0017 0.0075 Antimony Hematologic 0.000059 0.00011 0.00017 Arsenic 6.6E-08 1.9E-08 8.5E-08 Dermal, CVS 0.010 0.0029 0.013 Barium Urinary 0.00085 0.0034 0.0043 Beryllium None Reported 0.00018 0.0074 0.0076 Cadmium Urinary 0.000046 0.00026 0.00031 Cobalt Thyroid 0.00021 0.000024 0.00023 Copper GS 0.000051 0.000014 0.000066 Iron GS 0.0055 0.0016 0.0070 Lead NA - Manganese Nervous 0.0022 0.015 0.018 Mercury Nervous 0.0000023 0.0000094 0.000012 Nickel Body Weight 0.000041 0.000057 0.000098 Selenium Body Weight 0.000016 0.0000046 0.000021 Thallium Dermal 0.0030 0.00083 0.0038 Vanadium Urinary 0.00016 0.0017 0.0019 Zinc Hematologic 0.000059 0.0000099 0.000069 Chemical Total 6.7E-08 2.2E-08 9.0E-08 0.031 0.047 0.08 Exposure Point Total 9.0E-08 0.08 Exposure IV edium Total 9.0E-08 0.08 ------- TABLE 9.5.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Construction Workers Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Orqan(s) Routes Total Groundwater Air OWR 2-Butanone - Developmental - 0.00013 - 0.00013 cis-1,2-Dichloroethene NA - Methyl tert-butyl ether 3.9E-10 3.9E-10 Hepatic, Urinary, Ocular » 0.000035 0.000035 Trichloroethene 1.6E-07 1.6E-07 Immune, Developmental » 1.3 1.3 1,4-Dioxane 2.4E-09 2.4E-09 Respiratory » 0.000048 0.000048 Caprolactam Respiratory - Aluminum Nervous » Antimony NA - Arsenic NA » Barium Developmental - Beryllium Immune, Respiratory » Cadmium Urinary » Cobalt Respiratory » Copper NA » Iron NA » Lead NA - Manganese Nervous - Mercury Nervous » Nickel Respiratory » Selenium Respiratory -- Thallium NA » » » Vanadium Respiratory - - - Zinc NA - - - Chemical Total 1.6E-07 1.6E-07 1.3 1.3 Exposure Point Total 1.6E-07 1.3 Exposure IV edium Total 1.6E-07 1.3 Vledium Total 2.5E-07 1.4 Receptor Total Recep or Risk Total 4.5E-07 Receptor HI Total 2.4 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI Total CVS HI Total Dermal HI Total Developmental HI Total GS HI Total Hematologic HI Total Hepatic HI Total Immune HI Total Nervous HI Total None Reported HI Total Reproductive HI Total Respiratory HI Total Thyroid HI Total Urinary HI Total Ocular HI ------- TABLE 9.6.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 9.5E-09 - 1.7E-09 - 1.1E-08 Developmental, Immune, Reproductive 0.00032 0.000058 0.00037 Naphthalene Body Weight 0.00018 0.000034 0.00022 Dieldrin 6.6E-08 9.3E-09 7.5E-08 Hepatic 0.00083 0.00012 0.00094 Aluminum Nervous 0.0037 0.000053 0.0038 Antimony Hematologic 0.006 0.00057 0.007 Arsenic 1.3E-07 9.4E-09 1.4E-07 Dermal, CVS 0.0030 0.00021 0.0032 Cobalt Thyroid 0.0079 0.00011 0.0080 Copper GS 0.006 0.00009 0.006 Iron GS 0.010 0.00015 0.010 Lead NA Manganese Nervous 0.0061 0.0021 0.0082 Thallium -- - - Dermal 0.080 0.0011 0.081 Vanadium -- - - Dermal 0.0018 0.0010 0.0027 Zinc - - Hematologic, Immune 0.00048 - 0.000007 0.00048 Chemical Total 2.1E-07 - 2.0E-08 - 2.3E-07 0.127 - 0.0056 0.13 Exposure Point Total 2.3E-07 0.13 Exposure IV edium Total 2.3E-07 0.13 Air OWR Benzo(a)pyrene 9E-13 9E-13 Developmental, Reproductive 0.0000078 - 0.0000078 Naphthalene 1E-07 1E-07 Nervous, Respiratory 0.011 - 0.011 Dieldrin 3E-12 3E-12 NA Aluminum Nervous 0.00012 0.00012 Antimony NA Arsenic 1E-10 1E-10 NA 0.000016 0.000016 Cobalt 4E-10 4E-10 Respiratory 0.000065 0.000065 Copper NA Iron NA Lead NA Manganese Nervous 0.00048 0.00048 Thallium NA Vanadium Respiratory 0.000015 0.000015 Zinc - NA Chemical Total 1.1E-07 - - 1.1E-07 0.012 0.012 Exposure Point Total 1.1E-07 0.012 Exposure Medium Total 1.1E-07 0.012 Vledium Total 3.4E-07 0.14 ------- TABLE 9.6.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Groundwater OWR 2-Butanone 2-Hexanone -- - - Developmental Nervous 0.0098 0.037 0.000035 0.00056 0.0098 0.037 Chloroform 1.2E-07 2.9E-09 1.3E-07 Hepatic 0.0042 0.00010 0.0043 cis-1,2-Dichloroethene Urinary 0.0042 0.00013 0.0044 Vlethyl Tert-Butyl Ether 1.1E-08 7.2E-11 1.2E-08 NA Tetrachloroethene 5.9E-08 9.5E-09 6.8E-08 Nervous, Ocular 0.049 0.008 0.057 Trichloroethene 2.1E-07 8.9E-09 2.2E-07 Immune, Developmental 0.095 0.0041 0.10 Vinyl Chloride 1.7E-07 2.7E-09 1.8E-07 Hepatic 0.00086 0.000013 0.00087 1,4-Dioxane 1.6E-07 2.5E-10 1.6E-07 Hepatic, Urinary 0.00058 0.00000088 0.00058 Bis(2-ethylhexyl)phthalate 6.5E-08 6.5E-08 Hepatic 0.0025 0.0025 Caprolactam Developmental 0.025 0.00014 0.025 Aluminum Nervous 0.26 0.00038 0.26 Antimony Hematologic 0.015 0.00014 0.015 Arsenic 8.1E-06 1.2E-08 8.2E-06 Dermal, CVS 0.19 0.00028 0.19 Barium Urinary 0.015 0.00032 0.015 Beryllium GS 0.0078 0.0016 0.0094 Cadmium Urinary 0.0038 0.00011 0.0039 Cobalt Thyroid 0.96 0.00056 0.96 Copper GS 0.0085 0.000012 0.0085 Iron GS 0.29 0.00043 0.29 Lead NA Vlanganese Nervous 0.47 0.017 0.49 Vlercury Immune, Urinary 0.0019 0.000040 0.0020 Mickel Body Weight 0.012 0.000085 0.012 Selenium Hematologic, Dermal, Nervous 0.0028 0.0000041 0.0028 Thallium -- - - Dermal 0.24 0.00036 0.24 Vanadium -- - - Dermal 0.011 0.00063 0.012 Zinc -- - - Hematologic, Immune 0.0057 0.0000050 0.0057 Chemical Total 8.9E-06 - 3.6E-08 - 9.0E-06 2.7 0.035 2.8 Exposure Point Total 9.0E-06 2.8 Exposure Medium Total 9.0E-06 2.8 ------- TABLE 9.6.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Groundwater Air OWR 2-Butanone - - Developmental, Musculosketal 0.0020 0.0020 2-Hexanone Nervous 0.013 0.013 Chloroform 5.2E-07 5.2E-07 Hepatic 0.0024 0.0024 cis-1,2-Dichloroethene NA Vlethyl Tert-Butyl Ether 8.4E-09 8.4E-09 Hepatic, Urinary, Ocular 0.00011 0.00011 Tetrachloroethene 3.8E-08 3.8E-08 Nervous, Ocular 0.038 0.038 Trichloroethene 1.0E-07 1.0E-07 Immune, Developmental 0.13 0.13 Vinyl Chloride 7.9E-09 7.9E-09 Hepatic 0.00019 0.00019 1,4-Dioxane 1.4E-09 1.4E-09 Nervous, Respiratory 0.000097 0.000097 Bis(2-ethylhexyl)phthalate NA Caprolactam Respiratory Aluminum Nervous Antimony NA Arsenic NA Barium Developmental Beryllium Immune, Respiratory Cadmium Urinary Cobalt Respiratory Copper NA Iron NA Lead NA Vlanganese Nervous Vlercury Nervous Mickel Respiratory Selenium Respiratory Thallium - - NA » » » » Vanadium - - Respiratory - - - - Zinc - - NA - - - - Chemical Total 6.8E-07 - - 6.8E-07 0.19 0.19 Exposure Point Total 6.8E-07 0.19 Exposure Medium Total 6.8E-07 0.19 Vledium Total 9.7E-06 3.0 Receptor Total Recep or Risk Total 1.0E-05 Receptor HI Total 3.1 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI 0.012 Total CVS HI 0.20 Total Dermal HI 0.54 Total Developmental HI 0.27 Total GS HI 0.33 Total Hematologic HI 0.030 Total Hepatic HI 0.012 Total Immune HI 0.24 Total Nervous HI 0.92 Total Respiratory HI 0.011 Total Thyroid HI 0.97 Total Urinary HI 0.026 Total Ocular HI 0.096 Total Reproductive HI 0.00038 ------- TABLE 9.7.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) RoutesTotal Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 2.0E-07 - 2.5E-08 2.2E-07 Developmental, Immune, Reproductive 0.0036 0.00044 0.0040 Naphthalene - Body Weight 0.0021 0.00026 0.0024 Dieldrin 2.1E-07 2.0E-08 2.4E-07 Hepatic 0.0094 - 0.00089 0.010 Aluminum - Nervous 0.042 0.00040 0.043 Antimony - - Hematologic 0.069 0.0044 0.074 Arsenic 4.3E-07 - 2.1E-08 4.5E-07 Dermal, CVS 0.034 - 0.0016 0.035 Cobalt - Thyroid 0.090 0.00085 0.091 Copper GS 0.071 0.00067 0.071 Iron - GS 0.12 0.0011 0.12 Lead - NA - Manganese - Nervous 0.069 0.016 0.085 Thallium - Dermal 0.91 0.0086 0.92 Vanadium -- - Dermal 0.020 0.0074 0.028 Zinc -- - Hematologic, Immune 0.0054 0.000051 0.0055 Chemical Total 8.5E-07 6.6E-08 - 9.1E-07 1.4 0.043 1.5 Exposure Point Total 9.1E-07 1.5 Exposure Medium Total 9.1E-07 1.5 Air OWR Benzo(a)pyrene 5.6E-12 - 5.6E-12 Developmental, Reproductive 0.000025 - 0.000025 Naphthalene - 1.0E-07 - - 1.0E-07 Nervous, Respiratory - 0.035 - 0.035 Dieldrin 2.9E-12 2.9E-12 NA - - - - Aluminum - Nervous 0.00039 - 0.00039 Antimony - - - NA - - - - Arsenic - 9.6E-11 - - 9.6E-11 NA 0.000052 - 0.000052 Cobalt 3.2E-10 3.2E-10 Respiratory - 0.00021 - 0.00021 Copper - - - NA - - - - Iron - - NA - Lead - - - NA - - - - Manganese - - - Nervous 0.0015 0.0015 Thallium - - - NA - - - - Vanadium - - - Respiratory - 0.000047 - 0.000047 Zinc - - - NA - - - - Chemical Total - 1.0E-07 - - 1.0E-07 0.038 0.038 Exposure Point Total 1.0E-07 0.038 Exposure Medium Total 1.0E-07 0.038 Medium Total 1.0E-06 1.5 ------- TABLE 9.7.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure RoutesTotal Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Groundwater OWR 2-Butanone 2-Hexanone " Developmental Nervous 0.042 0.16 " 0.00046 0.0078 0.042 0.17 Chloroform 2.4E-07 2.6E-08 2.7E-07 Hepatic 0.018 - 0.0019 0.020 cis-1,2-Dichloroethene - - Urinary 0.018 - 0.0027 0.021 Methyl Tert-Butyl Ether 2.2E-08 - 6.0E-10 - 2.3E-08 NA - - - - Tetrachloroethene 1.1E-07 - 8.1E-08 - 1.9E-07 Nervous, Ocular 0.21 - 0.15 0.36 Trichloroethene (Mutagenic) 6.2E-07 - 1.2E-07 - 7.5E-07 NA - - - - Trichloroethene (Nonmutagenic) 3.2E-07 6.4E-08 3.9E-07 Immune, Developmental 0.41 0.080 0.49 Vinyl Chloride 1.3E-05 - 1.2E-06 - 1.4E-05 Hepatic 0.0037 - 0.00033 0.0040 1,4-Dioxane 3.2E-07 - 1.4E-09 - 3.2E-07 Hepatic, Urinary 0.0025 - 0.000011 0.0025 Bis(2-ethylh exy I )phthalate 1.3E-07 - - 1.3E-07 Hepatic 0.011 - - 0.011 Caprolactam - Developmental 0.11 0.0016 0.11 Aluminum - - Nervous 1.1 0.0052 1.1 Antimony - - Hematologic 0.063 - 0.0020 0.065 Arsenic 1.6E-05 - 7.4E-08 - 1.6E-05 Dermal, CVS 0.82 - 0.0038 0.82 Barium - - Urinary 0.065 - 0.0043 0.069 Beryllium - - GS 0.033 - 0.022 0.055 Cadmium - - Urinary 0.016 - 0.0015 0.018 Cobalt - - Thyroid 4.1 0.0076 4.1 Copper - - GS 0.0362 - 0.000169 0.0363 Iron - - GS 1.2 - 0.0058 1.3 Lead - - NA - - - - Manganese - - Nervous 2.0 - 0.24 2.3 Mercury - - Immune, Urinary 0.0082 - 0.00055 0.0088 Nickel - - Body Weight 0.050 - 0.0012 0.051 Selenium - - Hematologic, Dermal, Nervous 0.012 - 0.000056 0.012 Thallium - - Dermal 1.0 - 0.0048 1.0 Vanadium -- - - Dermal 0.047 - 0.0085 0.056 Zinc -- - - Hematologic, Immune 0.024 - 0.000068 0.024 Chemical Total 3.0E-05 - 1.5E-06 - 3.2E-05 11.7 - 0.55 12 Exposure Point Total 3.2E-05 12 Exposure to edium Total 3.2E-05 12 Medium Total 3.2E-05 12 ------- TABLE 9.7.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Chemical of Potential Carcinogenic Risk Non-Carcinogenic Hazard Quotient Concern Ingestion Inhalation Dermal External (Radiation) Exposure RoutesTotal Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Sediment Sediment OWR Cobalt Nickel " " Thyroid Body Weight 0.022 0.036 ~ 0.000 0.0085 0.022 0.044 Chemical Total - - 0.058 - 0.009 0.07 Exposure Point Total 0.07 Exposure Medium Total 0.07 Medium Total 0.07 ReceptorTotal Receptor Risk Total 3.3E-05 Receptor HI Total 14 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI Total CVS HI Total Dermal HI Total Developmental HI Total GS HI Total Hematologic HI Total Hepatic HI Total Immune HI Total Nervous HI Total Respiratory HI Total Thyroid HI Total Urinary HI Total Ocular HI Total Reproductive HI ------- TABLE 9.8.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future I Receptor Population: Residents Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Tarqet Orqan(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene 1.6E-08 - 2.5E-09 - 1.8E-08 Developmental, Immune, Reproductive 0.00034 - 0.000053 0.00039 Naphthalene - - Body Weight 0.00020 0.000031 0.00023 Dieldrin 7.1E-08 - 8.5E-09 - 7.9E-08 Hepatic 0.00088 - 0.00011 0.00099 Aluminum Nervous 0.0040 0.000048 0.0040 Antimony - Hematologic 0.0065 0.00052 0.0070 Arsenic 1.4E-07 - 8.6E-09 1.5E-07 Dermal, CVS 0.0032 - 0.00019 0.0034 Cobalt - Thyroid 0.0084 0.00010 0.0085 Copper GS 0.0066 0.000080 0.0067 Iron GS 0.011 0.00013 0.011 Lead - - NA - - - - Manganese Nervous 0.0065 0.0020 0.0084 Thallium Dermal 0.085 0.0010 0.086 Vanadium - Dermal 0.0019 0.00088 0.0028 Zinc - Hematologic, Immune 0.00051 0.0000061 0.00051 Chemical Total 2.3E-07 2.0E-08 - 2.5E-07 0.14 0.0051 0.14 Exposure Point Total 2.5E-07 0.14 Exposure Medium Total 2.5E-07 0.14 Air OWR Benzo(a)pyrene 4.7E-12 - 5E-12 Developmental, Reproductive - 0.000025 - 0.000025 Naphthalene - 3.6E-07 - - 4E-07 Nervous, Respiratory 0.035 - 0.035 Dieldrin - 1.0E-11 - - 1E-11 NA - - - - Aluminum - Nervous 0.00039 - 0.00039 Antimony - - - NA - - - - Arsenic - 3.4E-10 - 3E-10 NA 0.000052 - 0.000052 Cobalt - 1.1E-09 - - 1E-09 Respiratory - 0.00021 - 0.00021 Copper - - - NA - - - - Iron - - - NA - - Lead - - - NA - - - - Manganese - Nervous 0.0015 - 0.0015 Thallium - - - NA - - - - Vanadium - - - Respiratory - 0.000047 - 0.000047 Zinc - - - NA - - - - Chemical Total - 3.6E-07 - - 3.6E-07 0.038 0.038 Exposure Point Total 3.6E-07 0.038 Exposure Medium Total 3.6E-07 0.038 Medium Total 6.1E-07 0.18 ------- TABLE 9.8.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future I Receptor Population: Residents Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Tarqet Orqan(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Groundwater OWR 2-Butanone 2-Hexanone " " Developmental Nervous 0.021 0.079 " 0.00021 0.0033 0.021 0.082 Chloroform 3.6E-07 - 2.3E-08 - 3.8E-07 Hepatic 0.0090 0.00059 0.010 cis-1,2-Dichloroethene - Urinary 0.0090 0.0008 0.010 Methyl Tert-Butyl Ether 3.3E-08 5.8E-10 3.4E-08 NA - - - - Tetrachloroethene 1.7E-07 - 7.7E-08 - 2.5E-07 Nervous, Ocular 0.11 - 0.048 0.15 Trichloroethene (Mutagenic) 1.8E-07 - 2.1E-08 2.0E-07 NA - - - - Trichloroethene (Nonmutagenic) 4.8E-07 5.8E-08 5.4E-07 Immune, Developmental 0.20 - 0.024 0.23 Vinyl Chloride 5.1E-07 - 2.2E-08 - 5.3E-07 Hepatic 0.0018 - 0.00008 0.0019 1,4-Dioxane 4.7E-07 - 2.0E-09 - 4.8E-07 Hepatic, Urinary 0.0012 - 0.0000052 0.0012 Bis(2-ethylhexyl)phthalate 1.9E-07 - 1.9E-07 Hepatic 0.0053 - - 0.0053 Caprolactam - - Developmental 0.054 - 0.00082 0.055 Aluminum - Nervous 0.55 0.0023 0.56 Antimony - Hematologic 0.031 0.00086 0.032 Arsenic 2.4E-05 - 9.7E-08 - 2.4E-05 Dermal, CVS 0.41 - 0.0017 0.41 Barium Urinary 0.032 0.0019 0.034 Beryllium GS 0.017 0.0097 0.026 Cadmium - - Urinary 0.0082 0.00067 0.0088 Cobalt - - Thyroid 2.0 - 0.0034 2.1 Copper - - GS 0.018 - 0.000074 0.018 Iron - - GS 0.62 - 0.0026 0.63 Lead - - NA - - - - Manganese - - Nervous 1.0 - 0.10 1.1 Mercury - - Immune, Urinary 0.0041 0.00024 0.0043 Nickel - - Body Weight 0.025 - 0.00051 0.025 Selenium - - Hematologic, Dermal, Nervous 0.0060 - 0.000024 0.0060 Thallium - - Dermal 0.52 - 0.0021 0.52 Vanadium - - Dermal 0.024 - 0.0037 0.027 Zinc - - Hematologic, Immune 0.012 - 0.000030 0.012 Chemical Total 2.6E-05 - 3.0E-07 - 2.6E-05 5.8 - 0.21 6.0 Exposure Point Total 2.6E-05 6.0 Exposure to edium Total 2.6E-05 6.0 ------- TABLE 9.8.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Residents j|Rece£torA^^^^^^^^^^_ Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Tarqet Orqan(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Air OWR 2-Butanone 2-Hexanone " " " Developmental, Musculosketal Nervous " 0.0022 0.014 " 0.0022 0.014 Chloroform - 7.6E-07 - - 7.6E-07 Hepatic - 0.0026 - 0.0026 cis-1,2-Dichloroethene - - - NA - - - - Methyl Tert-Butyl Ether - 1.2E-08 - - 1.2E-08 Hepatic, Urinary, Ocular - 0.00012 - 0.00012 Tetrachloroethene - 5.5E-08 - - 5.5E-08 Nervous, Ocular - 0.041 - 0.041 Trichloroethene (Mutagenic) - 5.3E-08 - - 5.3E-08 NA - - - - Trichloroethene (Nonmutagenic) 1.1E-07 1.1E-07 Hepatic, Urinary 0.14 - 0.14 Vinyl Chloride 1.2E-08 1.2E-08 Hepatic - 0.00020 - 0.00020 1,4-Dioxane - 2.0E-09 - - 2.0E-09 Nervous, Respiratory - 0.00010 - 0.00010 Bis(2-ethylhexyl)phthalate - - - NA - - - - Caprolactam - - Respiratory Aluminum - Nervous Antimony - - NA - Arsenic - - - NA - - - - Barium Developmental - - - - Beryllium - - - Immune, Respiratory - - - - Cadmium - - - Urinary - - - Cobalt - - - Respiratory - - - - Copper - - - NA - - - - Iron - - - NA - - - - Lead - - - NA - - - - Manganese - - - Nervous - - - Mercury - - - Nervous Nickel - - - Respiratory - - - - Selenium - - Respiratory - - - Thallium - - - NA - - - - Vanadium - - - Respiratory - - - - Zinc - - - NA - - - - Chemical Total - 1.0E-06 - - 1.0E-06 0.20 0.20 Exposure Point Total 1.0E-06 0.20 Exposure Medium Total 1.0E-06 0.20 Medium Total 2.7E-05 6.2 Sediment Sediment OWR Cobalt - - Thyroid 0.0021 0.0000 0.0021 Nickel - - Body Weight 0.0033 - 0.0010 0.0043 Chemical Total - - 0.0054 - 0.0010 0.006 Exposure Point Total 0.006 Exposure Medium Total 0.006 Medium Total 0.006 ReceptorTotal Receptor Risk Total 2.8E-05 Receptor HI Total 6.4 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). Total Body Weight HI Total CVS HI Total Dermal HI Total Developmental HI Total GS HI Total Hematologic HI Total Hepatic HI Total Immune HI Total Nervous HI Total Respiratory HI Total Thyroid HI Total Urinary HI Total Ocular HI Total Reproductive HI ------- TABLE 9.9.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Thallium Vanadium Zinc 2.2E-07 2.9E-07 5.8E-07 " 2.7E-08 2.9E-08 2.9E-08 " 2.4E-07 3.1E-07 6.1E-07 Chemical Total 1.1E-06 - 8.5E-08 - 1.2E-06 Exposure Point Total 1.2E-06 Exposure Medium Total 1.2E-06 Air OWR Benzo(a)pyrene Naphthalene Dieldrin Aluminum Antimony Arsenic Cobalt Copper Iron Lead Manganese Thallium Vanadium Zinc - 1.0E-11 4.6E-07 1.3E-11 4.3E-10 1.4E-09 - - 1E-11 5E-07 1E-11 4E-10 1E-09 Chemical Total - 4.6E-07 - - 4.6E-07 Exposure Point Total 4.6E-07 Exposure Medium Total 4.6E-07 Medium Total 1.6E-06 ------- TABLE 9.9.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 2 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk External (Radiation) Exposure Routes Total Non-Carcinogenic Hazard Quotient Primary Target Organ(s) Exposure Point Total Expt 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylh exy I )phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Vanadium Zinc 5.6E-08 2.8E-07 8.0E-07 8.1E-07 1.3E-05 7.9E-07 3.2E-07 1.2E-09 1.6E-07 1.4E-07 1.2E-07 1.2E-06 3.4E-09 Chemical Total 5.7E-08 4.4E-07 9.4E-07 9.3E-07 1.4E-05 7.9E-07 3.2E-07 'Osure Medium Total Exposure Routes Total ------- TABLE 9.9.CTE SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 3 OF 3 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Groundwater Air OWR 2-Butanone 2-Hexanone Chloroform cis-1,2-Dichloroethene Methyl Tert-Butyl Ether Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylh exy I )phthalate Caprolactam Aluminum Antimony Arsenic Barium Beryllium Cadmium Cobalt Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Vanadium Zinc " 7.6E-07 1.2E-08 5.5E-08 5.3E-08 1.1E-07 1.2E-08 2.0E-09 " " 7.6E-07 1.2E-08 5.5E-08 5.3E-08 1.1E-07 1.2E-08 2.0E-09 Chemical Total - 1.0E-06 - - 1.0E-06 Exposure Point Total 1.0E-06 Exposure K edium Total 1.0E-06 Medium Total 5.9E-05 Sediment Sediment OWR Cobalt Nickel Chemical Total - - Exposure Point Total Exposure K edium Total Medium Total Receptor Total Receptor Risk Total 6.1E-05 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- RAGS Part D Table 10 Risk Summary ------- LIST OF TABLES RAGS PART D TABLE 10 SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs Table No. Reasonable Maximum Exposures 10.1 .RME Current Industrial Workers 1Q.2.RME Current Child Residents 10.3.RME Current Adult Residents 10.4.RME Current Lifelong Residents 10.5.RME Future Construction Workers 10.6.RME Future Industrial Workers 10.7.RME Future Child Residents 10.8.RME Future Adult Residents 10.9.RME Future Lifelong Residents Central Tendency Exposures 10.1 .CTE Current Industrial Workers 10.2.CTE Current Child Residents 10.3.CTE Current Adult Residents 10.4.CTE Current Lifelong Residents 10.5.CTE Future Construction Workers 10.6.CTE Future Industrial Workers 10.7.CTE Future Child Residents 10.8.CTE Future Adult Residents 10.9.CTE Future Lifelong Residents ------- TABLE 10.1.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Industrial Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface Soil Surface Soil OWR Arsenic All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - i - i - i - ii - Exposure Point Total Exposure IV edium Total w Air OWR Arsenic All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - i -- i - i - i - i - i - Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Receptor HI Total Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.2.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - ii I -- I - i -- n Exposure Point Total li 1 - Exposure IV edium Total i n Air OWR I All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels SiChemical Total -- I -- I -- I - I -- I - I -- Exposure Point Total Exposure Medium Total Vledium Total Sediment [Sediment OWR | All Cancer Risks Within Acceptable Lev sis All Hazard Quotients Within Acceptable Levels j|Chemical Total i - i - - i - I - I - I - Exposure Point Total jj Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Receptor HI Total | Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.3.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - i - i - i - ii - Exposure Point Total Exposure IV edium Total w Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I -- I - I - i - i - i - ii - Exposure Point Total Exposure Medium Total \\ Vledium Total j; Surface Water [Surface Water OWR All Cancer Risks Within Acceptable Lev sis All Hazard Quotients Within Acceptable Levels Chemical Total i - i - - i - i - i - i - Exposure Point Total Exposure Medium Total Vledium Total Sediment Sediment OWR All Cancer Risks Within Acceptable Lev rlS All Hazard Quotients Within Acceptable Levels Chemical Total -- I - I -- I - I -- I -- I -- Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Receptor HI Total f Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.4.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels Chemical Total -- l - l -- l Exposure Point Total Exposure Medium Total Air OWR I All Cancer Risks Within Acceptable Leve s llChemical Total - i - i - i - Exposure Point Total li Exposure IV edium Total n Medium Total ii Sediment Sediment OWR All Cancer Risks Within Acceptable Levels Chemical Total - i - i - i - i Exposure Point Total Exposure Medium Total !! Medium Total !! Receptor Total Receptor Risk Total | Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.5.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future I Receptor Population: Construction Workers Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Aluminum All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total -- - -- - 6E-08 I - I - l - Exposure Point Total 6E-08 Exposure Medium Total 6E-08 Air OWR Aluminum All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - I - I - 1E-07 I - I - I - Exposure Point Total 1E-07 Exposure Medium Total 1E-07 Medium Total 2E-07 Groundwater Groundwater OWR Trichloroethene All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels jjChemical Total -- I - I -- I 9E-08 I - I - l - Exposure Point Total 9E-08 Exposure Medium Total 9E-08 Air OWR Trichloroethene - 3E-07 - - 3E-07 Immune, Developmental - 3 - 3 jjChemical Total - 3E-07 - - 3E-07 3 3 Exposure Point Total 3E-07 3 Exposure Medium Total 3E-07 3 Medium Total 3E-07 3 ReceptorTotal Receptor Risk Total 5E-07 Receptor HI Total 3 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.6.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Orqan(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR All Cancer Risks Within A cceptable Lev sis All Hazard Quotients Within Acceptable Levels Chemical Total -- - -- - - - - - Exposure Point Total I; i - Exposure IV edium Total !! i - Air OWR I All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels I'chemical Total - I -- l - l - 1 - 1 - 1 - Exposure Point Total Exposure Medium Total Medium Total Groundwater Groundwater OWR Chloroform 1E-06 - 1E-08 - 1E-06 Hepatic 0.01 0.0001 0.01 Trichloroethene 2E-06 - 4E-08 - 2E-06 Immune, Developmental 0.2 0.005 0.2 Vinyl Chloride 2E-06 » 1E-08 » 2E-06 Hepatic 0.002 0.00002 0.002 1,4-Dioxane 1E-06 1E-09 1E-06 Hepatic, Urinary 0.001 0.000001 0.001 Aluminum Nervous 0.6 0.0004 0.6 Arsenic 7E-05 - 5E-08 - 7E-05 Dermal, CVS 0.5 0.0003 0.5 Cobalt -- - - Thyroid 2 0.0006 2 Vlanqanese -- » » Nervous 1 0.02 1 Chemical Total 8E-05 - 1E-07 - 8E-05 5 0.03 5 Exposure Point Total 8E-05 5 Exposure Medium Total 8E-05 5 Groundwater Air OWR Chloroform 2E-06 - - 2E-06 Hepatic 0.003 0.003 Trichloroethene 4E-07 - - 4E-07 Immune, Developmental 0.2 0.2 Vinyl Chloride 3E-08 » » 3E-08 Hepatic 0.0002 0.0002 1,4-Dioxane 6E-09 » » 6E-09 Nervous, Respiratory 0.0001 0.0001 Aluminum Nervous Arsenic NA Cobalt - - - Respiratory - - - - Manganese -- -- -- Nervous -- -- -- -- lohemical Total - 3E-06 - - 3E-06 0.2 0.2 Exposure Point Total 3E-06 0.2 Exposure IV edium Total 3E-06 0.2 Medium Total 8E-05 5 Receptor Total Receptor Risk Total 8E-05 Receptor HI Total 5 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.7.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Arsenic 4E-06 5E-07 4E-06 Dermal, CVS 0.1 0.01 0.1 Cobalt Thyroid 0.3 0.01 0.3 Copper GS 0.2 0.01 0.2 Iron GS 0.4 0.01 0.4 Manganese Nervous 0.2 0.1 0.3 Thallium Dermal 3 0.06 3 Chemical Total 4E-06 5E-07 4E-06 4 0.2 4 Exposure Point Total 4E-06 4 Exposure Medium Total 4E-06 4 Air OWR Arsenic 4E-10 4E-10 NA 0.00008 0.00008 Cobalt 1E-09 1E-09 Respiratory 0.0003 0.0003 Copper NA Iron NA Vlanganese Nervous 0.002 0.002 Thallium NA Chemical Total - 2E-09 - - 2E-09 0.003 0.003 Exposure Point Total 2E-09 0.003 Exposure Medium Total 2E-09 0.003 Vledium Total 4E-06 4 Groundwater Groundwater OWR 2-Hexanone Nervous 0.4 0.01 0.4 Tetrachloroethene 6E-07 3E-07 9E-07 Nervous, Ocular 0.5 0.3 0.8 Trichloroethene (Mutagenic) 2E-06 3E-07 3E-06 NA Trichloroethene (Nonmutageni 2E-06 2E-07 2E-06 Immune, Developmental 1 0.2 1 Vinyl Chloride 2E-05 2E-06 2E-05 Hepatic 0.009 0.0006 0.01 1,4-Dioxane 2E-06 5E-09 2E-06 Hepatic, Urinary 0.006 0.00002 0.006 Caprolactam Developmental 0.3 0.003 0.3 Aluminum Nervous 3 0.01 3 Arsenic 8E-05 4E-07 8E-05 Dermal, CVS 2 0.009 2 Cobalt Thyroid 11 0.02 11 Iron GS 3 0.01 3 Manganese Nervous 5 0.6 6 Thallium - - Dermal 3 » 0.01 3 Chemical Total 1E-04 - 3E-06 - 1E-04 29 - 1 30 Exposure Point Total 1E-04 30 Exposure IV edium Total 1E-04 30 Vledium Total 1E-04 30 Sediment Sediment OWR Chemical Total - - 0.0 Exposure Point Total - IE Exposure Medium Total - Vledium Total - Receptor Total Receptor Risk Total 1E-04 Receptor HI Total 34 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.8.RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Residents Receptor Aqe: Adult Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Thallium -- - - Dermal 0.3 0.01 0.3 Chemical Total - - 0.3 - 0.01 0.3 Exposure Point Total 0.3 Exposure IV edium Total 0.3 Air OWR Thallium - - NA - - Chemical Total - - 0.00 0.00 Exposure Point Total 0.00 Exposure Medium Total 0.00 Medium Total 0.27 Groundwater Groundwater OWR 2-Hexanone -- - - Nervous 0.2 0.008 0.3 Chloroform 2E-06 - 1E-07 - 3E-06 Hepatic 0.03 0.001 0.03 Tetrachloroethene 1E-06 » 4E-07 » 2E-06 Nervous, Ocular 0.3 0.1 0.4 Trichloroethene (Mutagenic) 2E-06 2E-07 2E-06 NA Trichloroethene (Nonmutageni 3E-06 3E-07 4E-06 Immune, Developmental 0.6 0.1 0.7 Vinyl Chloride 4E-06 1E-07 4E-06 Hepatic 0.006 0.0002 0.006 1,4-Dioxane 3E-06 1E-08 3E-06 Hepatic, Urinary 0.004 0.00001 0.004 Aluminum Nervous 2 0.010 2 Arsenic 2E-04 9E-07 2E-04 Dermal, CVS 1 0.007 1 Cobalt Thyroid 6 0.01 6 Iron GS 2 0.01 2 Vlanganese Nervous 3 0.4 4 Vlercury Immune, Urinary 0.01 0.001 0.01 Thallium - Dermal 2 0.009 2 Chemical Total 2E-04 - 2E-06 - 2E-04 17 1 18 Exposure Point Total 2E-04 18 Exposure Medium Total 2E-04 18 Groundwater Air OWR 2-Hexanone - - - Nervous - 0.3 - 0.3 Chloroform 3E-05 - 3E-05 Hepatic 0.05 0.05 Tetrachloroethene 2E-06 2E-06 Nervous, Ocular 0.8 0.8 Trichloroethene (Mutagenic) 3E-06 3E-06 NA Trichloroethene (Nonmutageni 5E-06 5E-06 Hepatic, Urinary 3 3 Vinyl Chloride 5E-07 5E-07 Hepatic 0.004 0.004 1,4-Dioxane 9E-08 9E-08 Nervous, Respiratory 0.002 0.002 Aluminum Nervous Arsenic NA Cobalt Respiratory Iron » » NA Manganese » » Nervous Thallium - - NA - - Chemical Total 4E-05 - - 4E-05 4 4 Exposure Point Total 4E-05 4 Exposure Medium Total 4E-05 4 Vledium Total 2E-04 22 Sediment Sediment OWR Cobalt - - Thyroid 0.01 - 0.00 0.01 Chemical Total - - 0.01 - 0.00 0.01 Exposure Point Total 0.01 H Exposure IV edium Total 0.01 Vledium Total 0.01 Receptor Total Receptor Risk Total 2E-04 Receptor HI Total 22 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.9. RME RISK SUMMARY REASONABLE MAXIMUM EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Arsenic 5E-06 - 7E-07 - 6E-06 Chemical Total 5E-06 - 7E-07 - 6E-06 Exposure Point Total 6E-06 Exposure Medium Total 6E-06 Air OWR Arsenic - - - 2E-09 Chemical Total - 2E-09 - - 2E-09 Exposure Point Total 2E-09 Exposure Medium Total 2E-09 Medium Total 6E-06 Groundwater Groundwater Chloroform Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylh exyl )phthalate Arsenic 2E-06 4E-06 5E-06 3E-05 5E-06 2E-06 2E-04 " 7E-07 5E-07 6E-07 2E-06 2E-08 1E-06 4E-06 3E-06 4E-06 6E-06 3E-05 5E-06 2E-06 2E-04 Chemical Total 3E-04 - 5E-06 - 3E-04 Exposure Point Total 3E-04 Exposure Medium Total 3E-04 Groundwater Air OWR Chloroform Tetrachloroethene Trichloroethene (Mutagenic) Trichloroethene (Nonmutagenic) Vinyl Chloride 1,4-Dioxane Bis(2-ethylh exyl )phthalate Arsenic " 3E-05 2E-06 3E-06 5E-06 5E-07 9E-08 " " 3E-05 2E-06 3E-06 5E-06 5E-07 9E-08 Chemical Total - 4E-05 - - 4E-05 Exposure Point Total 4E-05 Exposure Medium Total 4E-05 Medium Total 3E-04 Sediment Sediment OWR All Cancer Risks Within Acceptable Levels Chemical Total I I I - Exposure Point Total Exposure Medium Total Medium Total Receptor Total Receptor Risk Total | 3E-04 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.1.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Industrial Workers Receptor Age: Adult Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - [-[-[- Exposure Point Total Exposure IV edium Total Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I -- l - l - I - I - I - Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Receptor HI Total Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.2.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - i - i - i - ii - Exposure Point Total Exposure IV edium Total | Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total -- l - l -- l - 1 - 1 - 1 - Exposure Point Total Exposure Medium Total Vledium Total Sediment jSediment OWR All Cancer Risks Within Acceptable Lev ;ls All Hazard Quotients Within Acceptable Levels Chemical Total - i - i - i - 1 - 1 - 1 - Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Receptor HI Total Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.3.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Adult Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - i - i - i - ii - Exposure Point Total Exposure IV edium Total w Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I -- I - I - I - I - I - Exposure Point Total Exposure Medium Total Vledium Total Sediment [Sediment OWR All Cancer Risks Within Acceptable Lev sis All Hazard Quotients Within Acceptable Levels Chemical Total -- I - I -- I - i - i - i - Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Receptor HI Total Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.4.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Current Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface Soil Surface Soil OWR All Cancer Risks Within Acceptable Levels Chemical Total - I - l - l - Exposure Point Total Exposure IV edium Total Air OWR All Cancer Risks Within Acceptable Levels Chemical Total - I -- I - I - Exposure Point Total Exposure Medium Total Vledium Total Sediment [Sediment OWR Cobalt All Cancer Risks Within Acceptable Lev sis Chemical Total -- I - I -- I - Exposure Point Total Exposure Medium Total Vledium Total Receptor Total Receptor Risk Total Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.5.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 [Scenario Timeframe: Future I Receptor Population: Construction Workers Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Organ(s) Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - I - I - I - I - I - Exposure Point Total Exposure Medium Total Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - I - I . i I - I - I - Exposure Point Total Exposure Medium Total II Medium Total II Groundwater Groundwater OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total -- I - I -- I - I -- I -- I -- Exposure Point Total Exposure Medium Total Groundwater Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I -- I - I - I -- I -- I -- Exposure Point Total Exposure Medium Total Medium Total -- ReceptorTotal Receptor RiskTotal | Receptor HI Total ( -- | Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.6.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Industrial Worker Receptor Age: Adult Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Ingestion Inhalation Dermal Target Orqan(s) Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - l - l - i - i - i - ii - Exposure Point Total Exposure IV edium Total | Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I -- l - l - 1 - 1 - 1 - - Exposure Point Total Exposure Medium Total Medium Total Groundwater Groundwater OWR All Cancer Risks Within Acceptable Lev sis All Hazard Quotients Within Acceptable Levels Chemical Total - i - i - i - 1 - 1 - 1 - Exposure Point Total Exposure Medium Total - Groundwater Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - I - I - | -- I 0.00 1 -- - Exposure Point Total - Exposure IV edium Total - Medium Total - Receptor Total Receptor Risk Total Receptor HI Total -- Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.7.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Child Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Tarqet Orqan(s) Ingestion Inhalation Dermal Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR Thallium Dermal 0.9 0.01 0.9 Chemical Total - - 0.9 - 0.01 1 Exposure Point Total 1 Exposure IV edium Total 1 Air OWR Thallium - - NA - Chemical Total - - - Exposure Point Total - Exposure Medium Total - Vledium Total 1 Groundwater Groundwater OWR 2-Hexanone Tetrachloroethene Vinyl Chloride Aluminum Arsenic Cobalt Iron Manganese Thallium 1E-07 1E-05 2E-05 - 8E-08 1E-06 7E-08 2E-07 1E-05 2E-05 Nervous Nervous, Ocular Hepatic Nervous Dermal, CVS Thyroid GS Nervous Derm al 0.2 0.2 0.004 1 0.8 4 1 2 1 0.008 0.1 0.0003 0.005 0.004 0.008 0.006 0.2 0.005 0.2 0.4 0.004 1 0.8 4 1 2 1 Chemical Total 3E-05 - 1E-06 - 3E-05 11 - 0.4 11 Exposure Point Total 3E-05 11 Exposure IV edium Total 3E-05 11 Vledium Total 3E-05 11 Sediment Sediment OWR Cobalt - - All Hazard Quotients Within Acceptable Levels Chemical Total - - I - I - I - - Exposure Point Total - Exposure Medium Total - Vledium Total - Receptor Total Receptor Risk Total 3E-05 Receptor HI Total 11 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.8.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 [Scenario Timeframe: Future I Receptor Population: Residents Medium Exposure Medium Exposure Point Chemical of Potential Concern Carcinogenic Risk Non-Carcinogenic Hazard Quotient Ingestion Inhalation Dermal External (Radiation) Exposure Routes Total Primary Target Organ(s) Ingestion Inhalation Dermal Exposure Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total I - i -- i - it I - I - I - Exposure Point Total I Exposure Medium Total ii Air OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total - I - I - I - I - I - I - Exposure Point Total Exposure Medium Total Medium Total Groundwater Groundwater OWR Tetrachloroethene Aluminum Cobalt Manganese 2E-07 " 8E-08 " 2E-07 Nervous, Ocular Nervous Thyroid Nervous 0.1 0.6 2 1 " 0.05 0.002 0.003 0.1 0.2 0.6 2 1 Chemical Total 2E-07 8E-08 - 2E-07 4 - 0.2 4 Exposure Point Total 2E-07 4 Exposure Medium Total 2E-07 4 Groundwater Air OWR Tetrachloroethene Aluminum Cobalt Manganese " 5E-08 " " 5E-08 Nervous, Ocular Nervous Respiratory Nervous " 0.04 " 0.04 Chemical Total - 5E-08 - - 5E-08 0.04 0.04 Exposure Point Total 5E-08 0.04 Exposure Medium Total 5E-08 0.04 Medium Total 3E-07 4 Surface Water Surface Water OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total I - I I - I -- I - I Exposure Point Total Exposure Medium Total Medium Total Sediment Sediment OWR All Cancer Risks Within Acceptable Levels All Hazard Quotients Within Acceptable Levels Chemical Total I - I I - I -- I - I Exposure Point Total Exposure Medium Total Medium Total ReceptorTotal Receptor Risk Total | 3E-07 Receptor HI Total ( 4 Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- TABLE 10.9.CTE RISK SUMMARY CENTRAL TENDENCY EXPOSURES OLD WILMINGTON ROAD SITE PAGE 1 OF 1 Scenario Timeframe: Future Receptor Population: Residents Receptor Age: Lifelong (Child and Adult) Medium Exposure Exposure Chemical Carcinogenic Risk Non-Carcinogenic Hazard Quotient Medium Point of Potential Concern Ingestion Inhalation Dermal External Exposure Primary Ingestion Inhalation Dermal Exposure (Radiation) Routes Total Target Organ(s) Routes Total Surface/Subsurface Soil Surface/Subsurface Soil OWR All Cancer Risks Within Acceptable Levels Chemical Total | .. | .. | .. Ij Exposure Point Total II Exposure Medium Total II Air OWR All Cancer Risks Within Acceptable Levels Chemical Total - -- - - Exposure Point Total Exposure Medium Total ii Medium Total » Groundwater Groundwater OWR All Cancer Risks Within Acceptable Levels I Chemical Total - I - I - I - Exposure Point Total Exposure Medium Total Groundwater Air OWR All Cancer Risks Within Acceptable Levels jjChemical total - I -- I - I - Exposure Point Total Exposure Medium Total Medium Total ii Surface Water Surface Water OWR All Cancer Risks Within Acceptable Levels Chemical Total -- - -- - 1 1 Exposure Point Total Exposure Medium Total Medium Total Sediment Sediment OWR Cobalt - - Chemical Total - - 1 Exposure Point Total Exposure Medium Total II Medium Total II ReceptorTotal Receptor Risk Total Notes: 1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005). ------- APPENDIX G PADEPCONCURRENCE LETTER 54 ------- Pennsylvania DEPARTMENT OF ENVIRONMENTAL PROTECTION April 5, 2023 Mr, Paul Leonard, Director Superfund and Emergency Management Division U.S, Environmental Protection Agency, Region III 4 Penn Center 1600 John F, Kennedy Blvd. Mail Code; 3SD21 Philadelphia, PA 19103 Re: Interim Record of Decision (ROD) Old Wilmington Road Superfund Site West Cain Township, Chester County Dear Mr. Leonard: The Department of Environmental Protection (DEP) has received and reviewed the draft Interim Record of Decision (ROD) dated March 28, 2023 for the Old Wilmington Road Superfund Site in West Cain Township, Chester County. This ROD presents the selected remedial action for Operable Unit 1, which addresses three inter-connected plumes of contaminated groundwater pose a threat to public health through ingestion and inhalation exposure. The plumes consist of tetrachloroethene (PCE), trichloroethene (TCE), and 1,4-Dioxane. The area of concern (AOC) includes properties impacted or potentially impacted by these contaminants of concern (COC). The selected remedy for Operable Unit 1 includes the following major components: • The installation of a newly constructed public waterline and offering to connect all properties within the AOC; • Offer to provide Vapor Intrusion mitigation systems at residences where COC concentrations in indoor air are detected at levels exceeding cleanup levels for Vapor Intrusion; • Long-term monitoring of the installed Vapor Intrusion mitigation systems to assess the effectiveness of the systems; and • Implementation of Institutional Controls (ICs) to prevent exposure to Site-related contaminants in groundwater by deterring the use of untreated groundwater at properties within the AOC, to restrict any impact on the Selected Remedy, and to prevent exposure to Site-related COCs via Vapor Intrusion through a notification and reporting process relating to new construction in potentially affected areas. DEP hereby concurs with EPA's proposed remedy with the following conditions: • DEP will be given the opportunity to review and comment on documents and provide meaningful input regarding decisions related to the design and implementation of the Southeast Regional Office 2 East Main Street | Norristown, PA 19401-4915 | 484.250.5980 [ Fax 484,250.5981 [ www.dep.pa.gov ------- Mr. Paul Leonard, Director - 2 - April 5, 2023 remedial action, to assure compliance with Pennsylvania's applicable or relevant and appropriate requirements (ARARs) and to be considered (TBC) requirements. • DEP will be given the opportunity to review and comment on documents and provide meaningful input regarding decisions regarding the ICs, including on which parcels ICs are required. ICs that implement the Activity and Use Limitations (AULs) may be in the form of Environmental Covenants (ECs), pursuant the Section 6517(a)(1) of the Pennsylvania Uniform Environmental Covenants Act (UECA), 27 Pa.C.S. § 6517(a)(1) or Administrative Orders issued under Section 512(a) of HSCA. When ECs are implemented, they will need to comply with Section 6517(a)(1) of the UECA, 27 Pa.C.S, § 6517(a)(1). In cases where property owners refuse to execute an EC, at EPA's request, DEP may issue an Administrative Order under Section 512(a) of HSCA, to implement such restrictions directly. Section 512(a) states that "[a] site at which hazardous substances remain after completion of a response action shall not be put to a use which would disturb or be inconsistent with the response action implemented." • DEP will have the opportunity to review and comment before any modification to the ROD in the form of an Amendment or an Explanation of Significant Differences. • State cost share atid Operation and Maintenance obligations will be further clarified during design of the remedy and the completion of a Superfund State • EPA will assure that DEP is provided an opportunity to fully participate in any negotiations with responsible parties. • DEP reserves the right and responsibility to. take independent enforcement actions pursuant to state law. Thank you for the opportunity to comment and concur on this EPA ROD. If you have any questions regarding this matter, please do not hesitate to contact me. Sii Patrick L. Patterson Regional Director Southeast Regional Office cc: Ms. Shandruk, EPA Region III (electronic) West Cain Township Chester County Health Department Mr. R. Patel (electronic) Ms, McClennen (electronic) Ms. Wagner (electronic) Mr. Cheny (electronic) Ms, C. McCarthy (electronic) Re Contract. ------- |