United States Office oi Environmental Protection Emergency and Agency Remedial Response EPA/ROD/R03-91/130 September 1991 Superfund Record of Decision: McAdoo Associates, PA ------- 50272-101 REPORT DOCUMENTATION i. REPORT NO. 2. PAGE EPA/ROD/R03-91/130 4. TWe and Subtitle SUPERFUND RECORD OF DECISION McAdoo Associates, PA Third Remedial Action - Final 7. Authorfa) 9. Performing Organization Name and Addresa 12. Sponsoring Organization Name and Addreaa U.S. Environmental Protection Agency 401 M Street, S.W. Washington, D.C. 20460 3. Recipient a Acoaeaion No. S. Report Date 09/30/91 6. 8. Performing Organization Rept No. 10. Pro|ecVTaak/Worii Unit No. 11. Contract(C) or GrantyG) No. (C) (G) 13. Type of Report & Period Covered 800/000 14. 15. Supplementary Note* 16. Abstract (Umil: 200 word«) The 9-acre McAdoo Associates site is an inactive strip and deep mining facility located in Kline Township, Schuylkill County, Pennsylvania. The site consists of two locations: the 8-acre McAdoo-Kline Township (MKT) location, and the 1-acre McAdoo-Blaine Street (MBS) location. The MKT location is situated at the site of an old (subsurface and surface strip) coal mine, and land adjacent to this location is industrial, abandoned, or contains reclaimed mine areas. The shallow aquifer at the MKT location consists of ground water-filled mine workings and other subsurface voids beneath the MKT location, collectively called the "mine pool". The mine pool discharges at the Silverbrook discharge to the upper reaches of the Little Schuylkill River. Both the mine pool and the river have been severely affected by acid mine ' drainage. The MBS location is adjacent to a residential area and a mine spoil reclamation site, and is presently covered with gravel and used for vehicle storage. From the 1880's to the 1960's, strip and deep mining of anthracite coal occurred at the MKT location. Two rotary kiln furnaces and an upright liquid waste incinerator were installed onsite between 1975 and 1976 to reclaim metals from waste sludges, reportedly using waste solvents as fuels. In 1979, EPA ordered the MKT location to (See Attached Page) 17. Document Analyai* a. Descriptor* Record of Decision - McAdoo Associates, PA Third Remedial Action - Final Contaminated Media: None Key Contaminants: None b. Identifiera/Open-Ended Terms c. COSATI Held/Group 18. Availability Statement 18. Security Oaaa (Thia Report) None 20. Security Ctaaa (Thia Page) None 21. No. ofPagea 55 22. Price (See ANS1-Z38.18) See /nafructiofu on Reverse OPTIONAL FORM 272 (4-77) (Formerly NTIS-3S) Department of Commerce ------- EPA/ROD/R03-91/130 McAdoo Associates, PA Third Remedial Action - Final Abstract (Continued) close because of numerous environmental compliance problems. At the time of closure, the location contained an incinerator, a garage and offsite trailer, 6,790 drums of hazardous waste, four above-ground 15,000-gallon storage tanks, three above-ground 10,000-gallon tanks, and miscellaneous debris. The MBS location was used for the storage of waste oil and hazardous waste in 5 underground tanks. Activities at the MBS location were stopped by EPA in 1979. As a result of Federal investigations, all drums and site features were removed from the MKT location between 1981 and 1988. A 1984 Initial Remedial Measure (IRM) for the MBS location provided for removal of underground tanks and contaminated soil, and a 1985 ROD addressed remediation of soil contamination at the MKT location. This ROD addresses sediment, ground water, and surface water at the MKT location, and ground water at the MBS location. EPA has determined that no further remedial action other than that already implemented at the site is required to ensure protection of human health and the environment; therefore, there are no contaminants of concern. The selected remedial action for this site is no further action because previous interim remedial activities were adequate to protect human health and the environment. Ground water monitoring at the MKT and MBS locations will be performed, including expanding the ongoing water quality monitoring program at the MKT location, and installing four ground water monitoring wells at the MBS location. The estimated present worth cost for this no action remedy with ground water monitoring is $503,540, which includes an annual O&M cost of $434,000 for 30 years. PERFORMANCE STANDARDS OR GOALS: Not applicable. ------- RECORD OF DECISION MCADOO ASSOCIATES SITE DECLARATION NAME AND LOCATION McAdoo Associates Site: Kline Township and Blaine Street locations McAdoo Borough, Kline Township, Schuylkill County, Pennsylvania Operable Unit 2 STATEMENT OF BASIS AND PURPOSE This decision document represents the selected remedial action for the McAdoo Associates Site. Ground water, surface water, and sediments associated with the McAdoo-Kline Township (MKT) location, and ground water associated with the McAdoo-Blaine Street (MBS) location, (both hereinafter considered the site), are addressed in this Record of Decision (ROD). This ROD is in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, (CERCLA) 42 U.S.C. SS 9601 efc. sea. . and, to the extent practicable, the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). It should be noted that soil conditions at both the MBS and MKT locations were previously addressed and remediated by RODs completed in 1984 and 1985, respectively. This decision is based upon the contents of the Administrative Record File for the McAdoo Associates Site (index attached). The Commonwealth of Pennsylvania does not concur with the selected remedy. DESCRIPTION OF THE REMEDY The EPA has determined that no further remedial action other than that already implemented at the site is required to ensure protection of human health and the environment. However, ground- water monitoring at the MKT and MBS locations will be performed for 30 years to ensure the effectiveness of the remedial actions already executed. The major components of the monitoring program include: Expansion of the ongoing long-term (30 years) water quality monitoring program as needed at the MKT location (originally included as part of the 1985 ROD) to include additional sampling of all existing monitoring wells. Samples from these wells shall be analyzed for volatile organic compounds and nine inorganic analytes. Installation of four ground-water monitoring wells at the MBS location and the long-term monitoring (30 years) of ground-water quality at the MBS location. Samples from these wells shall be ------- analyzed for volatile and semi-volatile organic compounds and Total Analyte List inorganics. DECLARATION STATEMENT The EPA has determined that no further remedial action is necessary for the McAdoo Associates site. The previous response actions implemented (drum and soil removal, soil excavation and capping) eliminate the need to conduct any additional remedial action. Because this remedy will result in hazardous substances remaining onsite, a review will be conducted in accordance with Section 121(c) of CERCLA, 42 U.S.C. S 9621(c), within five years after the commencement of the monitoring. The review will be conducted to ensure that human health and the environment continue to be adequately protected and to determine the effectiveness of remedies already implemented at the McAdoo Associates Site. Edwin B. Erickson Date Regional Administrator Region III ------- RECORD OF DECISION MCADOO ASSOCIATES SITE, PA TABLE OF CONTENTS SITE NAME, LOCATION, AND DESCRIPTION 1 SITE HISTORY AND ENFORCEMENT ACTIVITIES 6 HIGHLIGHTS OF COMMUNITY PARTICIPATION 7 SCOPE AND ROLE OF OPERABLE UNIT 8 SITE CHARACTERISTICS 8 MCADOO-KLINE TOWNSHIP LOCATION 9 SURFACE WATER/SEDIMENT INVESTIGATION 9 ECOLOGICAL INVESTIGATION 14 GROUND-WATER INVESTIGATION 14 MCADOO-BLAINE STREET LOCATION 30 BACKGROUND INFORMATION REVIEW 30 SUMMARY OF SITE RISKS 35 CONTAMINANTS OF POTENTIAL CONCERN 35 EXPOSURE ASSESSMENT 36 HUMAN HEALTH RISK 36 ECOLOGICAL RISK 41 SELECTED REMEDY 46 DOCUMENTATION OF SIGNIFICANT CHANGES 47 ATTACHMENT - RESPONSIVENESS SUMMARY - ADMINISTRATIVE RECORD INDEX ------- DECISION SUMMARY MCADOO ASSOCIATES SITE SITE NAME, LOCATION, AND DESCRIPTION The McAdoo Associates site addressed in this Record of Decision includes the McAdoo-Kline Township (MKT) location and the McAdoo- Blaine Street (MBS) location (see Figure 1). The MKT location is located in Kline Township, Schuylkill County, in eastern Pennsylvania. The MKT location lies approximately 1.5 miles south of McAdoo Borough due east of U. S. Route 309, and immediately south of the ramp to the 1-81 interchange (see Figure 2) . The MKT location consists of approximately 8 acres and is situated at the site of an old (subsurface and surface strip) coal mine. Land use in the vicinity of the MKT location is industrial (a cogeneration plant is located nearby) or abandoned or reclaimed mine areas. Residential areas are located at a greater distance north (approximately 900 to 1900 feet) and south (over 1 mile) of the MKT location (see Figure 3). The shallow "aquifer" at the MKT location consists of ground water filled mine workings and other subsurface voids beneath the MKT location, collectively called the "mine pool". The mine pool discharges at the Silverbrook discharge to the upper reaches of the Little Schuylkill River, the nearest surface water body to the MKT location (Figure 3) . The Little Schuylkill River and mine pool have been severely affected by acid mine drainage from the former mining activities in the area, and there is little to no aquatic life in the upper reaches of the river as a consequence of this mine drainage. Residential wells in the vicinity of the MKT location tap the deeper aquifer located within the Pottsvilie and Mauch Chunk Formations. The Pottsville and Mauch Chunk Formations consist of interbedded sandstones, siltstones and shales. There appears to be no hydrologic connection between the mine pool and deeper aquifers in the area, based on the results of the 1991 focused Remedial Investigation/Feasibility Study (RI/FS) and previous studies. The approximately 1-acre MBS location is located in the Borough of McAdoo, also in Kline Township, Schuylkill County, approximately 3 miles from the MKT location (see Figure 4). The MBS location is situated near a residential area (McAdoo Borough) and mine spoil reclamation site. The MBS location is presently covered with gravel and used for vehicle storage. Residential population in the immediate vicinity of the MBS location is approximately 2,500 (1990 census). Water supply in this area is provided by surface water reservoirs and water supply wells operated by the Honey Brook Water Company. These sources are located over 1000 feet southwest of the MBS 1 ------- BLAINE STREET LOCATION HONEYBROOK WATER CO. WELL LOCATION SOURCE Hafl»ton. Coryglwn. T*n«qua tnti D*ww Quadrangle FIGURE 1 GENERAL LOCATION MAP MCADOO-KLINE TOWNSHIP AND BLAINE STREET LOCATIONS MCADOO, PENNSYLY ------- TO HAZELTON MCADOO i I TO TAMAQUA ALLENTOWN MINE SPOILS 300' FIGURE 2 SITE MAP MCADOO-KLINE TOWNSHIP LOCATION MCADOO, PENNSYLVANIA ------- LOFTY CREEK UTTLE SCHUYLKIU. RIVER 750 FEET 1500 FIGURE 3 REGIONAL LOCATION MAP MCADOO SITE MCADOO, PENNSYLVANIA ------- ! HOUSE I 'HOUSC: N. HARRISON ST. 10 u House I HOUSC! OARAGE ALLEY Mouse! MBS LOCATION N. LOGAN ST. ALLEY NOT TO SCALE ABANDONED IHOUSeI OLD MINE PROPERTY OPEN FIELD FIGURE 4 SITE MAP MCADOO-BLAINE STREET LOCATION MCADOO, PENNSYLVANIA ------- location. The water supply wells are screened in the deep aquifer within the Mauch Chunk Formation underlying the region. The nearest surface water body to the MBS location is a small unnamed drainage stream located approximately 400 feet northeast of the location. Drainage from the MBS location is to the northeast away from the water supply areas. SITE HISTORY AND ENFORCEMENT ACTIVITIES The original use of the MKT location was the strip and deep mining of anthracite coal, which occurred sporadically from the 1880's to the 1960's. The 1-1/2 acre tract comprising the western portion of the MKT location was acquired in January 1975 by McAdoo Associates. Two rotary kiln furnaces and an upright liquid waste incinerator were installed on the property between 1975 and 1976, and reportedly were operated to reclaim metals from waste sludges, reportedly using waste solvents as fuels. The MKT location was ordered closed in 1979 as a result of numerous environmental compliance problems. At the time of closure in April of 1979, the MKT location was inventoried and found to contain: an incinerator, a garage and an office trailer; 6,790 drums of hazardous waste; four above ground 15,000-gallon storage tanks and three above ground 10,000-gallon tanks; and miscellaneous pallets, bricks and debris. The MBS location was used for the storage of waste oil and hazardous waste in 5 underground tanks located at the location prior to incineration at the MKT facility previously discussed. Activities at the MBS location were discontinued in 1979. Because both locations were operated as one facility involving the same ownership and waste, they were combined and collectively called the McAdoo Associates site for evaluation in the Hazard Ranking System (HRS) scoring process. The site received a score of 63.03 and the McAdoo Associates site was placed on the National Priorities List (NPL) in September 1983. With regard to the MKT location, all of the drums and all site features, with the exception of one 15,000 gallon tank were removed between January 1981 and October 1982. The remaining tank was removed in November 1988. An RI/FS was conducted at the MKT location by an EPA contractor in 1984, and a Record of Decision (ROD) was issued on June 28, 1985, that addressed remedial action of soil contamination at the MKT location. However, the 1985 ROD deferred the decision regarding any remedial action of ground water and/or surface water (and related sediment) pending additional evaluation. The selected remedial action for soil at the MKT location described in the 1985 ROD included the removal of remaining tanks and debris; limited excavation of contaminated soils with off-site disposal at ------- a RCRA facility; the capping of the MKT location; diversion of surface water; maintenance of diversion ditches and site cover; and long term ground-water monitoring. All soil related remedial measures have been completed with the exception of the construction of the site cover, which will be completed during Fall 1991. With regard to the MBS location, based on subsequent EPA investigations of the tanks and tank contents, EPA issued a ROD for Interim Remedial Measures (IRM) on June 5, 1984, calling for cleaning and removal of underground tanks, the removal of contaminated soil, and the sampling of subsurface soil. The remedial work was completed by EPA in 1985. It should be noted that the MBS location 1984 IRM ROD included provisions that a supplemental ROD would be prepared after the remedial action was complete to include recommendations for further site action, if any. Because of the outstanding issues related to the site, a supplemental focused RI/FS was conducted by EPA during late 1990/early 1991 to further evaluate the ground water, surface water, and sediment at the MKT location, and to evaluate the remedial action performed at the related MBS location. HIGHLIGHTS OF COMMUNITY PARTICIPATION The public participation requirements of CERCLA §S 113(k)(2)(B)(i- v) , 117 and 121(f) (1) (G) , 42 U.S.C. §S 9613 (k) (2) (B) (i-v) , 9617 and 9621(f)(1)(G) have been met by the following activities. In July 1991, the focused RI/FS study reports prepared by an EPA contractor for this operable unit were released to the public along with the Proposed Plan developed by EPA. These documents were made available to the public in both the administrative record file and an information repository at the McAdoo-Kelayres Library (Kelayres Road, McAdoo, PA 18237), and USEPA Region III (841 Chestnut Building, Philadelphia, PA 19107). The notice of availability for these two documents was published in the Hazelton Standard Speaker on July 22, 1991. A 30-day public comment period began on July 22, 1991 and ended on August 21, 1991. In addition, a public meeting was held on August 8, 1991 to discuss the Proposed Plan. At this meeting, representatives from EPA and PADER answered questions about the Proposed Plan and the status of the site. All comments which were received by EPA during the public comment period, including those expressed at the public meeting, are addressed in the Responsiveness Summary, which is attached to this Record of Decision. ------- SCOPE AND ROLE OF OPERABLE UNIT This is the third action to be implemented by EPA for the McAdoo Associates site. As stated previously, soil contamination has been previously addressed by RODs prepared for the McAdoo Associates site (MKT and MBS locations) in 1985 and 1984, respectively. Therefore this ROD is intended to address only the surface water, sediment, and ground water at the MKT location, and ground water at the MBS location. These are the only remaining environmental concerns at the site. SITE CHARACTERISTICS As stated above, the scope of this operable unit was to evaluate the surface water, sediment, and ground water at the MKT location and ground-water at the MBS location. To evaluate these elements, a focused RI/FS was completed for the site during late 1.990/early 1991. The primary objectives for the focused RI/FS were to collect sufficient data to: characterize potential contamination of the ground water, surface water, and surface channel sediments in the vicinity of the MKT location; determine if contamination poses'a threat to human health or the environment; identify and characterize all migration pathways, routes of entry, and receptors for contaminants detected (if any) in the ground water (especially related to nearby residential wells), surface water, or channel sediment in the vicinity of the MKT location; determine the need for remedial actions at the MKT location to address existing or potential threats posed by contaminants in the ground water beneath, or in the surface water or channel sediments downstream of, the MKT location; fully evaluate the results of the IBM ROD at the MBS location; and provide support for the identification, development, and evaluation of appropriate remedial technology alternatives. To provide the data necessary to accomplish the objectives of the focused RI/FS, a thorough compilation, characterization, and evaluation of existing information and data was completed. This included detailed evaluation of regional and local geology and hydrogeology, and review of all available information for the MBS location. 8 ------- In addition, numerous field activities were performed at the MKT location, including two rounds of ground-water sampling of 7 on- site monitoring wells and 7 off-site residential wells, surface water and sediment sampling from 10 locations, and a complete ecological assessment of the Little Schuylkill River in the vicinity of the MKT location. Evaluation of contaminant transport pathways and potential risk to human health and environment is based collectively on the efforts of this 1991 focused RI as well as previous efforts by others (including the EPA 1984 RI/FS, and other studies completed by the Responsible Parties consultants during 1987 through 1990). A detailed description of the findings of the 1991 focused RI follows. MCADOO-KLINE TOWNSHIP (MKT) LOCATION SURFACE WATER/SEDIMENT INVESTIGATION Ten surface water/sediment locations downstream of the MKT location were sampled in December 1990 to evaluate current surface water and sediment quality (Figure 5) . Sample locations included three background locations along Lofty Creek that had not been affected by either the MKT location or acid mine drainage (AMD), and seven locations along the Little Schuylkill River, including the Silverbrook Discharge (Location 2 - Mine Pool outlet). Surface water samples were analyzed for Target Compound List (TCL) organics (including volatile and semivolatile organics and pesticides and PCBs) and Target Analyte List (TAL) inorganics (metals and cyanide), as well as basic water quality parameters (pH, temperature, alkalinity, TDS, TSS, etc.). Sediments were analyzed for TCL/TAL parameters, pH, total organic carbon, and grain size. It should be noted that the Little Schuylkill River downstream of the MKT location has been, and continues to be, severely affected by AMD originating from the Silverbrook discharge, and former coal mining activities in the area. The results of the surface water sampling are summarized in Table 1. With regard to organics, only low concentrations (ranging from 8 to 32 micrograms per liter [ug/1]) of carbon disulfide, chloromethane and bis (2-ethylhexyl) phthalate were detected in the surface water. However, it is not certain that these compounds originated from the MKT location. Of the three compounds detected, the carbon disulfide was detected in field blanks (indicating potential laboratory contamination). Bis (2-ethylhexyl) phthalate was not detected in samples collected closest to the MKT location, rather was only detected in downstream samples and background samples (indicating other potential sources). Only chloromethane was detected at a surface-water sample location near the MKT location, however, this compound was not detected in any other media (soils, sediment, or ground water) at the MKT location. ------- SILVERBROOK 2 DISCHARGE UTTLC 3CMUYLJCILL RIVER LEGEND. SURFACE WATER/SEDIMENT SAMPLE LOCATIONS 0 750 1500 FEET FIGURE 5 SURFACE WATER/SEDIMENT SAMPLING LOCATIONS MCADOO-KLINE TOWNSHIP LOCATION MCADOO, PENNSYLVANIA 10 ------- Table 1 Surface Water Data Sumnary (a) Organic and Inorganic Compounds MKT LOCATION 0 _ (D Z rt '' ^ i~i -6 0 TO o c r *""1 s COMPOUNDS (b) Volatlles carbon dlsulflde chloroform chlorone thane Seml-VoUtiles bis (2-ethylhexyl) ph thai ate IiorgaHlct Al um1 num Antimony Barium Beryllium Calcium Cobalt Copper Iron Lead Magnesium Manganese Nickel Potassium Selenium Sodium Thallium Vandlum Zinc Cyanide CW|L 5 5 10 10 200 6 200 5 5000 50 25 100 3 5000 15 40 5000 5 5000 10 50 20 10 (a) Sampling dates: 12/12/90 (b) Only elements detected are summa SW-1 4B 947 29P 5930 16P 1170 2750P 353 740P 2B 12700 68 rlzed. SW-2 32 4730 27P 3P 7380 59 10900 3B 6440 1250 59 1190P 10500 210 SW-3 4390 26P 2P 11500 41P 16P 4860 2B SU-4 16L 3570 27P 2P 9120 38P 13P 3760 2B 5790 4850P 1050 47 569P 10900 174 871 41 566P 9170 150 SW-5 3L 3470 29P 2P 8980 36P 14P 4320 IB 4760P 847 38P 436P 9180 146 SW-5 (DUP) 3490 28P 2P 8940 37P 12P 3950 2B 4750P 841 33P 734P 8990 145 FIELD RINSE. SW-6 SW-7 SW-8 SW-9 SW-10 BLANK BLANK B 8 8L 10 1840 1780 322 283 285 56P 26P 25P 23P 23P 15P IP 5260 5580 1260P 1180P 1010P 14P 18P 13P IIP 1800 1560 122 91P 1B7 IB 2770P 2820P 770P 718P 632P 464 441 74 73 67 23P 529P IB 6950 7220 4030P 4170P 4560P 19BB 216B 2K 88 87 35 33 29 (c) All units ug/1 (total metals) B - Not detected above levels measured In blanks L - Analyte present. Value reported Is biased ION. P - Analyte present. K - Analyte present. Quantltatlon may not Reported value may be actual value expected to be be accurate. biased high, actual value expected higher. to be lower. ------- There were a variety of inorganics present in the surface water samples collected from the Little Schuylkill River and Lofty Creek. Inorganics present in the samples from the Little Schuylkill River at high concentrations relative to concentrations detected in background samples from Lofty Creek include aluminum, antimony, beryllium, calcium, cobalt, copper, iron, magnesium, manganese, nickel, potassium, sodium, and zinc. In general, the concentrations of inorganics in the surface water decreases downstream as a result of dilution and chemical precipitation associated with changing pH. The elevated levels of inorganics in the surface water is likely a result of the combination of AMD and leaching of inorganics from the MKT location into the mine pool. Several of these elements were detected at high concentrations in the soil at the MKT location, including aluminum, iron, nickel, and zinc. However, most of these elements, especially antimony, beryllium, iron, aluminum, calcium, sodium, potassium, and manganese, also occur naturally in high concentrations in the coal and .coal refuse in Pennsylvania Eastern Province coals; therefore their presence in the surface water is not unexpected. Although it is not possible to quantify the extent of inorganic contribution from the MKT location to the mine pool, and subsequently the surface water (as compared to the contribution from AMD), based on available data, AMD remains the primary controlling factor for inorganics in the surface water. The results of the sediment sampling are summarized in Table 2 (see Figure 5 for sample locations). With respect to organic compounds, the results indicate there are no volatile organic compounds present in the sediments of the Little Schuylkill River or Lofty Creek. However, some semi- volatile compounds (namely polynuclear aromatic hydrocarbons [PAHs]) are present in the sediments from nearly every station sampled. All of these PAHs were previously detected in soils at the MKT location. However, the presence of PAHs in some, but not all, of the samples collected, including background sample stations, indicates the prevalence of these compounds in the environment from various sources. The source of the PAHs in the Little Schuylkill River may be from MKT location run-off as well as run-off from other areas draining into this basin, including PA Rt. 309. The source of PAHs present in background samples from Lofty Creek is unknown. A wide range of inorganics were detected in sediment samples from the Little Schuylkill River and Lofty Creek. Inorganics present in sediment from the Little Schuylkill River at high concentrations, relative to concentrations measured in background sediment samples from Lofty Creek, include aluminum, arsenic, beryllium, calcium, cobalt, copper, iron, lead, magnesium, manganese, mercury, nickel, potassium, sodium, vanadium, and zinc. Some of these elements were detected at high concentrations in the soil at the MKT location. However, the presence of some of the inorganics, at concentrations 12 ------- Table 2 Sediment Data Summary (a) Organic and Inorganic Compounds COMPOUNDS (b) Volatile* chloroform Semi -Volatile* phenol 2-chlorophenol phenathrene fluoranthene pyrene benzo(a) anthracene chrysene bis (2 ethyl hexyl) phthalate benzo(b) fluoranthene benzo(k) fluoranthene benzo(a) pyrene 1ndeno(1.2.3-cd) pyrene benzo(g.h) perylene iMorgulcs Al uml num H- Arsenic w Barium Beryllium Cadmium Calcium Chromium Cobalt Copper Iron Lead Magnesium Manganese -^ercury QNIckel C potassium ^Selenium r?Z Silver Q. Oodlum "Z. Cihalllum f* .'Vandium | Ci)nc I^yanlde CROL 5 330 330 330 330 330 330 330 330 330 330 330 330 330 40 2 40 1 1 1000 2 10 5 20 0.6 1000 3 0.2 8 1000 1 2 1000 2 10 4 2 SED-01 SED-02 96L 240L 250L 140L 150L 130L 110L 84L 85L 1820 6J 157 0.41P 4100 20 19 11400 76 893P 1810 0.12 6P 257P 0.35P 99P IIP 470 150L 170L 1660 4 14P 3 262P 14 31500 20 243P 48 0.22 294P 3 5BP 18 SED-03 1420 2P 8P 99P 6 18 8570 10 65P 17 0.62 311P IP 69P 0.338 9 SED-04 210L 530L 550L 290L 280L 170L 210L 230L 190L 190L 200L 3340 9 31P 9 212P 18 4P 32 110E3 95 536P 332 0.17 7P 314P 3 68P 128 2 SED-05 260L 540L 600L 340L 320L 200L 240L 230L 200L 190L 200L 3190 11 77 0.42P 7 6160 333 20 28 90600 44 2490 4250 0.44 9P 145P 2 37P 100 124 3 {al Sampling date: 12/12/90 (b) Only compounds detected are suranarlzed. (c) All units ug/kg except blanks which are ug/1. SED-05 (OUP) SED-06 140L 140L 330L B20L 200L 880L 290 530L 120L 530L 120L 130L 390L 85L 430L 93L 380L 300L 290L 2080 1770 5 3 20P 16P 0.25P 0.22P 5 2 3040 342P 9 10 5P 14 20 57700 31700 135 20 417P 290P 213 411 0.14 148P 156P 1 4 36P 44P 4P 71 41 3 SED-07 130L 1BOL 87L 90L 77L 79L 12BO 2 37P 2 278P 8 12 18200 20 242P 208 1.1 139P 0.81P 3 8P 30 SED-08 SED-09 1170 2P 5P SIP 11 2830 8 78P 102 153P 4 0.32B 14 89L 120L 773 IP 3P 25B 7 1770 SB 70P 84 113P 2P 8 FIELD RINSE. TRIP SEO-10 BLANK BLANK BLANK 6 140L 170L 110L 110L 79L 83L 6B4 56P IP 8P 38B 2P 2370 SB IP SOP 75 0.75 75P 4 9 B - Not detected above levels measured in blanks. L - Analyte present. Value reported is biased low, actual value expected to be higher. P - Analyte present. Quanltatlon may not be accurate. ------- detected, are not exclusively the result of former MKT location activities. Most of these elements are found in coal and coal waste. Table 3 is a listing of the inorganic background concentrations developed during the 1991 focused RI/FS as related to former mining activities and AMD. Comparison to Table 3 values show that most of the inorganics present in the sediment are within expected background ranges for the area. In summary, there are few, if any, MKT location-related contaminants (organics and inorganics) present in the surface water and sediments in the Little Schuylkill River. ECOLOGICAL INVESTIGATION The ecological investigation included a characterization and evaluation of aquatic and terrestrial habitats along the Little Schuylkill River. The aquatic and terrestrial habitats were identified, measured (where appropriate), and described at six stations (Stations 1, 2, 4, 5, 6, and 8 - see Figure 5). The results of the ecological investigation revealed that the aquatic community of the Little Schuylkill River is severely affected by AMD (i.e. there is very little aquatic life), although the aquatic community appears to be less affected at present relative to the results of a PADER study conducted in 1984. The terrestrial community was not affected. In summary, no ecological impairment directly attributable to MKT location-related contaminants was identified. GROUND-WATER INVESTIGATION The ground-water investigation consisted of two elements: an on- site ground-water investigation and an off-site ground-water investigation. The on-site ground-water investigation included the characterization of MKT location hydrogeology and two rounds of MKT location monitoring well sampling. The off-site ground-water investigation included the characterization of regional hydrogeology and two rounds of off-site residential well sampling. The results of each element follows. ON-SITE GROUND-WATER INVESTIGATION Regionally, the MKT location is within the Appalachian Mountain section of the Ridge and Valley Province, within a geologic structure referred to as the Silver Brook Syncline (Figure 6 - see Figure 3 for orientation of cross-section line). Locally, the MKT location is underlain by the Llewellyn and Pottsville Formations (Figure 7). The Llewellyn Formation consists of sandstones, siltstones, and shales, with interbedded coal. Of particular 14 ------- Table 3 1991 RI Proposed* Inorganic Background Concentration Ranges Former Mining Activity/Acid Mine Drainage Related MKT LOCATION Element Site Soils/Sediments' (rag/kg) Site Ground Water/Surface Water (9/1) aluminum antimony arsenic bariim. beryllium cadmium calcium chromium cobalt copper iron lead magnesium manganese mercury nickel potassium/sodium selenium silver thallium vanadium zinc 16.000-47,000 0.9-1.2 6-27 40-200 .5-6 .3-27 120-700 20-75 0-7 10-75 4,400-12.000 10-15 0-100 3-620 .15-. 24 10-125 2,300-10,000 3-5 ... 5 20-140 3-65 29-55* ... ... ... 0-.010* 0-.020* 119-194* 0-.010* ... ... 15-122* ... 68-83* 4' ... 0-1.23* 17* . ... ... 0.21-0.2' Given that no site specific background data regarding AMD were available, general background values for the site were derived for comparison purposes as part of the 1991 RI. The general background values were derived by a USEPA contractor based on the following references for studies conducted at other AMD and coal mining sites in Pennsylvania. Combination of National Research Council (1980), Click and Davis (1984). and Davis (1984. personal communication) Gorilla Quarry Results (USEPA. 1985) Coal Nine Drainage Terrs. PA (Nrtagu, 1978) Shamokin Creek. Welghscale. PA (Brown!ow. 1979) Combination of Sources b and c No Data Available 15 ------- MOUTH A POTTCHUNK FAULT aooo*i CENTBALIA FAULT SILVER BROOK 8YNCLINE -BEARS HEAD FAULT -LOCUST MOUNTAIN ANTICLINE -LOFTY FAULT DELANO ANTICLINE POTTCHUNK FAULT TILL CREEK ROAD WELLS '..' -* "'..'-'.V 'jt - OUTH A' |KHHHHHRyHHK»uaHH£iS5tHRhRR^ -------------i-i-r-i-c-i-z-i-i-CH^^^^ - -25->2-KK35HKrKHHKSKHHKKHKKHHHHHHKK:£KKHKH^ Lr^^J^i^-Ti^vrLrLrt-ru _ -.. ^ .>.*. .».-_ _- *.«-^j *^j- ^-~~JT~* ',f*- ** ^~~~- -_xj^ . -~_n;n" ~~"^_r"_"*__ ---~-~-~-~-~-z-i<:-i->z-ioc->>i-i->r-^^ ^>>I->IHK-I-Z-I-3^>_-_-------- UMMSfc | | LLSWEUYN FORMATION W* a,S. * »i L' 1 POTTSVLLI FORMATION ww va.o». A « C33 MAUCN CHUNK FORMATION, Uf « MEMIER WILVEMROOK ROAO-RESIOENTIAL WELLSI t»3j "AUCH CHUNK FORMATION, MIOOLE UCMMM ISTH.L CREEK ROAO-RESIOENTIAL WELLSI torn RUCK MOUNTAIN COAL SEAM SOURCE. ADAPTED FROM USDS MAPPING (WOOD 1 AHNUT, 18731 FIGURE 6 REGIONAL GEOLOGIC CROSS-SECTION MCADOO AREA. PENNSYLVANIA ------- SOUTH B' I MAMMOUTH COAL SEAM MAMMOUTH COAL SEAMi BUCK MOUNTAIN COAL SEAMi 1700 1800 1500 1400 1300 1200 1100 1000 000 rN CLINE | "X | HI C( y / / 200 400 600 i 800 r BUCK MOUNTAIN COAL SEAM CENTRALIA FAULT NORTH B MAMMOUTH COAL SEAM BUCK MOUNTAIN COAL SEAM MW-3B MW-2 1000 1200 1400 1800 1800 i 2000 r 2200 LEGENDi | | LLEWELLYN FORMATION I | POTTSVILLE FORMATION SEE FIGURE 6 FOR LOCATION OF B'-B CROSS SECTION LINE FIGURE 7 LOCAL GEOLOGIC CROSS SECTION MCADOO-KLINE TOWNSHIP LOCATION MCADOO, PENNSYLVANIA ------- importance are two major coal seams (Buck Mountain and Mammoth), both of which have been extensively mined in the vicinity of the MKT location. The Pottsville Formation consists of well-cemented sandstones and conglomerates, although this formation is reported to be fractured. The hydrogeology at the MKT location is controlled by the local geology. The shallow "aquifer" at the MKT location consists of ground water filled mine workings and other subsurface voids, collectively called the "mine pool". The only known discharge for the mine pool is the Silverbrook discharge to the south, which forms the upper reaches of the Little Schuylkill River. The mine pool is located within the Llewellyn Formation (Figure 7) , and ranges in depth from approximately 50 to 200 feet below ground surface at the MKT location. Horizontal ground-water flow at the MKT location is generally toward the south, in the general direction of the Silverbrook discharge (Figure 8) . A schematic hydrogeologic cross-section for the MKT location depicting subsurface conditions is given in Figure 9. Based on water level readings obtained from wells screened in the underlying Pottsville Formation (MW-l, MW-2, MW-3B and MW-4), the vertical ground-water gradient at the MKT location is upward, indicating that ground-water is flowing from the Pottsville Formation into the mine pool, and subsequently flowing out the Silverbrook discharge. Consequently it follows that the mine pool at the MKT location is not hydrologically connected to other aquifers in the area. The 7 on-site monitoring wells that were installed during the 1984 RI (see Figure 8) were sampled in December 1990 and February 1991 to evaluate current ground-water quality at the MKT location. Four of the wells (MW-l, MW-2, MW-3B, and MW-4) are screened in the Pottsville Formation, and wells MW-5 and MW-9 are reported to be screened in the mine pool. Wells MW-l and MW-2 are considered upgradient of the MKT location and not affected by AMD. Ground- water samples were analyzed for TCL and TAL (total and dissolved) parameters. A summary of organic and inorganic sampling results from the two sampling events are given in Tables 4 and 5, respectively. The 1991 focused RI results indicate that low levels of organic compounds are present in the mine pool ground water at the MKT location. Low levels of 1,1 dichloroethane, 1,1 dichloroethene, and 1,1,1 trichloroethane were detected in the sample collected from MW-5 (and duplicate) in both sampling events, with toluene and xylenes detected in the second round only at very low "J" flagged values (Note - a "J" qualifier denotes that an analyte is present, but the reported value may not be accurate or precise). Also, 1,1 dichloroethane, 1,1 dichloroethene, 1,2 dichloropropane, and bis (2-ethylhexyl) phthalate were detected in the first sample collected from MW-9. Additionally, 1,1,1 trichloroethane and 1,2 dichloroethane were detected in the second sample from MW-9, although the phthalate was not. A "J" flagged value of 1,1,1 18 ------- i MINE POOL EVEVATION fl564t LEGENDi MONITORINQ WELLS |t584.3| GROUND-WATER ELEVATION \| GROUND-WATER FLOW DIRECTION q O O FEET ABOVE SEA LEVEL 200' FIGURE 8 GROUNOWATER POTENTIOMETRIC MAP APRIL 25 1991 MCADOO-KLINE TOWNSHIP LOCATION MCADOO, PENNSYLVANIA ------- NJ P NW A ^-^ A' SE 1625 -, 1620- 1610 _ 1600- 1590- i&nn iwou 1570 - (A a u 1560 - O ffl S1550 - u. Z 1540 - tj > 1530 - LI 1520 - 4K4A 1S1O ^ * . FRACTURED POTT4VILLI ROD I SOX , * , MAS4IVI POTTSVLLE C«MI r 4 \~ * MOD 1 MX 1= \- * t o ^ - *fc^ * . * * f ///y--/-. ..V v /FUl/AMD/OR / / , . -/WiftHIRID ROCK / / < A // / ' - / / .rqAcrURCo - /. . v Cengl FRACTURED '. "°D °'at* 4 C*ntl . MOD MX \ ^f i i ( UPPfiR WICK' = MTM. COAL = ROQ 0-I7X LM» FRACTURED = ', CM^ _ TIOHT 8< H ROD > ifX ROD 70;IOOX FRACTURED A MOO iOX POTTSVILLE FORMATION * . . . ^^^^ i * ?'< r ^\T_s \\ ^ * »' %' r\ ' ' '"VI - k>'* / f /^ / / " " /" - - - - - ^ / / / / / / '/ / /"^ A " /, // // / / / / / I. "< ,/ / /FILL AND/OR X /' / x < / /WEAtMERED ROCK / / ) UPPER RUCK ^ - / / / / / / / .)MTN. COAL "~-/ / / / / / v ^/ / / / / " " < / / / / ~'~ / / ^ _ / / / - */ / 4 Con«l " <* / ""-. _y T FRACTURED AND - DECOMPOSED : Si - ROD JO-UX : LLEWELLYN : FORMATION :| ' 'i \ 1 1 BUCK MTM. COAL IMME POOLI ' Hr1 VOID 4 OOB FILLED : * 'V^-. ? POTTSVILLE ' " " . PUCKMTM., FORMATION . . " COAL M "".--(-.. O 1440 1430 - 1420 - f- l_ * - * HARD CONQL. E . ROD sa-MOX "n - . - -. - HOIE GROUTED TO 00.0 Fl. ' DEPTH 1625 1620 - 1610 - 1600 - 1590 icon loou - 1570 - 1560 - 1550 - 1540 - 1530 - 1520 ic-in IW *» 100' 200' ^v***nt*k^ *\ " ^.^i_J FIGURE 9 HORIZONTAL SCALE SCHEMATIC HYDROGEOLOGIC E ' LEOEH0. CROSS-SECTION ,| . V GROUND WATER ELEVATION 14-26 Oil MCADOO -KLINE TOWNSHIP LOCATION 1 s. SANDSTONE MCADOO, PENNSYLVANIA 1423 A , * * *** Conflj CONOLOUERATE ROD ROCK QUALITY DETERMINATION ------- Table 4 Ground-Water Data Summary (a) Organic Compounds Monitoring Wells MKT LOCATION COMPOUND (b) Volatile* 1.1 dlchloroethene 1.1 dlchloroethane chloroform 1.1,1 trlchloroethane 1,2-dlchloropropane ethyl ene chloride SMl-Volatlles bis (2-ethythexyl) phthalate (a) Sampling dates: 12/19/90 and (b) Only compounds detected are si (c) All units ug/1 MU-5 FIELD RINSE TRIP CRQL(c) HW-1 NW-2 NW-3 MW-3B HW-4 HW-5 (DUP) HW-9 BLANK BLANK BLANK 5 5 3J 3J 5 18 21 4J 5 3J 4J 4J 5 30J 27J 5 270J 5 4J 4J 10 10 12/20/90 arlzed. J Analyte present. Reported value My not be accurate or precise. ------- Table 4 (continued) Ground-Water Data Summary (a) Inorganics Monitoring Wells HKT LOCATION HW-1 MU-2 ELEMENT CRDL b) (c) 11 * ' T(d) D(e) T MumlnuM 200 188B 151B 282B 9ariu> 200 98P 90P 87B Beryl HUB 5 Cad*1u» 5 16 16 4P Calcium 5000 6530L 6190L 4300L Chromium 10 9P Cobalt 50 :opper 25 IBP 13P 30 Iron 100 297 31P 395 Lead 3 14L 30L Ugnesiua 5000 3500L 3270P 3470P Unganese 15 219 200 212 tlckel 40 47B 45B 43B >otassiun 5000 1870B 2260B 1990S illver 10 fandlun 50 !inc 20 81 77 99 D 178B 89P 4270L 10B 18P 31P 30 3330P 216 33B 1480B IP 99 MW-3 T D 191E3 112P 13B 23 2P 37E3L 9040L 45 179 388 155 69E3 3470 305L 3757P 2470P 2020 822 1836 79B 5480B 4460B 9P 836 35B MW-3B T 6970 213 8640L 648 23P 14800 19L 6890 2290 150 2160B IP 145 D 870 178P 8120L 49B 13P 38P 36 5180 1850 SOB 1320B 109 a Sampling dates: 12/19/90 and 12/20/90 b Only elements detected are summarized. c All units ug/1 d) T - Total metals (unfiltered) e) 0 - Dissolved metals (filtered) MW-4 . T D 985 38 29 11900 10200 19L 2440 J 30 1L 8L 5870 5030 1850 1820L 62 29L 2140L 2380L 3J 101 23 MW-5 MW-S(DUP) T 517 66P 10200 41P 43E3J 21 5540 6650 44 2440L 2J 74 D T 604 48P 85P 6950 11300 9L 31P 41P 33700 43E3J 23 4290 5760 6300L 6550 32P 46.1 2280L 1J 2J 39J 72 D 47P 6540 33P 31600 3900P 4560 18P 1SOOL 2J 36 MU-9 FIELD BLANK T 21500 618 3P 12 17E3L 75B 159 2230 23L 8340 1770 514 24BOB 367 DTD 18200 24B 4P 4P . 2P 18E3L 90B 918 16B 150 110 28B 12 4B 8370 1830 400 2660B 21 362 B - Not detected above levels measured in blanks. L - Analyte present. Value reported is biased low, actual value expected P - Analyte present. RINSE BLANK T D * 119P 18P 129L 15B 11B 6P 20P 490B 350B 9P to be higher. Quantltatlon my not be accurate ------- Table 5 Ground-Water Data Sunmary (a) Organic Compounds Monitoring Wells NKT LOCATION COMPOUND (b) VoUtlUs 1.1 dlchloroethene 1.1 dlchloroe thane chloroform 1.1.1 trlchloroethane 1,2-dlchloropropane Mthylene chloride 1.2 dlchloroethane tol uene total xylenes CRQL(c) NW-1 HW-2 HW-3 NW-3B HW-4 5 5 5 0.7B 5 4J 5 5 5 5 5 MW-9 FIELD RINSE TRIP NW-5 HW-9 DUP BLANK BLANK BLANK 3J 2J 2J 19 5 5 0.6B ZJ 2J 2J 43 150 140 400'" 400"' 3J 3J 30 1J 1J 0.5J 0.9J a) Sampling date: 2/21/91 ibi Only compounds detected are simarlzed. I c i All units ug/1 id) QuantUated fro* Secondary Dilution J Analyte present. Reported value May not be accurate or precise. ------- Table 5'(continued) Ground-Water Data Sumnary (a) Inorganics Monitoring Wells NKT LOCATION ELEMENT CRDL (b) (c) AluMinuM 200 Arsenic 10 BarluM 200 Beryl HUM 5 CadMluM 5 CalcluM 5000 ChroMluM 10 Cobalt 50 K> Copper 25 ^ Iron 100 Lead 3 MagnesluM 5000 Manganese 15 Mercury 0.2 Nickel 40 PotassluM 5000 SodluM 5000 VandluM 50 Zinc 20 MU-1 MW-2 T(d) D(e) T 1248 1248 223 89. 5P 95P 92. IP 3.38 2.2B 2.3P 8440 8750 4870P 3.28 2.38 3.78 2.2P 5.3P 6.2P 15. 6P 20. 6B 21.78 1638 21.38 259 9.3K 6. SB 8.6K 4710P 5000P 39SOP 319 339 240 27.68 52. IB 38. OB 14808 1530B 1300B 95800 101E3 69700 1158 128B 139B D 210 86. 7P 2.78 4800P 8. OP 55.28 16.98 11. 8J 5000P 235 36.28 13708 70600 1368 MU-3 T D 86400 191P 11.2 5360 IS. IP 2.68 3. OB 9840 6470 144 95.7 42. 2P 196J 38. IB 136E3 1308 178K 4.0 13500 2350P 2070 737 0.98 138 100 977D 2880P 96300 97500 76.1 496 120 MU-3B T 12300 3.2P 254 9470 22.2 87.8 65. 8B 24900 45. 5K 8110 3060 0.24 57. 3B 3660P 121E3 15. OP 24. BB D 534 191P 2.06 9000 2.3B 69.7 33.98 340 2.2B 5540 2410 81.48 1770B 119E3 139B MW-4 T D 1180 15.08 42. 6P 32. IP 10300 9920 7.18 6.5P 4. OP 7.6B 74. U 2300 99. SB 9.2 9.1J 5370 5130 1950 1910 36. 6B 26. 2B 2010B 1770B 172E3 174E3 82.28 102B MW-5 T 1440 54. 6P 2.66 7890 10. 8B 195 25. SB 42500 11.8 3800P 5150 27. OB 1480B 25000 101B D 24. 4B 3. IP 37. 6P 5760 3. SB 50.3 28.48 40500 17. 9J 3620P 5840 21. IB 11006 24600 76.96 MU-9 T 22100 3.5J 193P 7.3 2.76 24800 24.1 166 184J 12700 16. IK 12000 2970 161 3850P 54700 7.4P SIS D 16300 14. 6P 5.8 24500 3. OB 158 145J 91. 2B 8. OB 10700 2700 142 3120P 54400 481 MU-9 (DUP) T D 24700 16400 4.2P 278 14. OP 7.7 4.3P 2. 66 3.16 24600 24600 48.1 2.26 166 157 180J 167J 19300 80.48 16. 6K 9.9J 12400 10700 3010 2730 163 145 4410P 2850P 53600 54500 12. 3P 509 490 FIELD BLANK RINSE BLANK T D T D 16.76 13. 7B 36.2 16.26 1.3P 2.26 392B 31.96 153P 22. 9P 3.46 2.16 7.86 7.16 27.88 2.76 13.56 8.66 44.3 8. 88 1.36 1.46 1.76 1.5B 27.78 17.96 4216 98.66 1316 2546 1006 11.26 16. SB 54.46 a) Sampling date: 2/21/91 b Only eleoents detected are sunnarlzed. c All units ug/1 d T - Total Metals (unflltered) . e) D - Dissolved netals (filtered) B - Not detected above levels Measured In'blanks. J - Analyte present. Reported value nay not be accurate or precise. L - Analyte present. Value reported Is biased low, actual value expected to be higher. P - Analyte present. Quantltatlon May not be accurate. ------- trichloroethane was reported in MW-3 from the second sampling event. The MKT location is the most likely source of organic compounds in the mine pool, given that no organics were detected in upgradient monitoring wells. Chloroform and methylene chloride detections in both rounds appear to be derived from lab blank contamination. Inorganics detected in monitoring wells at the MKT location are attributed to a combination of naturally elevated background conditions, the effects of mining and AMD, and former MKT location activities. The naturally elevated pH of the ground water results in the high concentrations of inorganics in the ground water by causing pH extensive dissolution of inorganics from soils at the MKT location and from the country rock in the subsurface. Of the inorganics detected in ground water, iron, manganese, beryllium, and nickel are associated with AMD. Inorganics that were detected at levels within background concentrations include barium, cadmium, lead, copper, and aluminum. Arsenic and chromium were detected in one -sample from sampling event, but they were not detected in surface water downgradient from the site. Only cobalt, silver, and zinc were detected in concentrations that might be considered site- related. OFF-SITE GROUND-WATER INVESTIGATION The residential wells located on Silverbrook Road and Still Creek Road draw water from the water bearing zones within the Mauch Chunk Formation (see Figure 6), which is not present at the surface at the MKT location. Previous EPA studies completed in 1984 and 1985 both concluded that the residential wells were not likely to be hydrologically connected to the MKT location. However, the hydrogeologic relationship was re-evaluated during the 1991 focused RI, and nearby residential wells were resampled. Ground-water elevations measured on December 19 and 20, 1990, in residential areas and general flow directions in the MKT location vicinity are shown schematically in Figure 10. A generally southerly hydrologic gradient is indicated by the water elevations, with the highest water elevations measured in the Silverbrook Road residences, lower water elevations in the MKT location wells (decreasing from north to south across the MKT location), and the lowest measured levels occurring in the residential wells along Still Creek Road. Based on water level information, the Silverbrook Road residential wells are hydrologically upgradient from the wells at the MKT location. Residential well pumping is not considered to be of sufficient magnitude to change this general flow direction. In addition to occurring hydrologically upgradient from the MKT location, the residential wells along Silverbrook Road are situated "across geologic structure" from the MKT location. Ground water movement in sedimentary or meta-sedimentary rocks is likely to 25 ------- LOFTY CREEK CRASHER 16681 */l POTTEN d6Z?J W^^o ;i654i« <«rTio>0 WATER LEVELS (2-20-91) MW-1.MW-2 MW-3B.MW-4 MW-3,MW-5,MW-9 GROUND ELEVATIONS AT RESIDENTIAL WELL LOCATIONS WERE APPROXIMATED FROM U-S.O.S. TOPOGRAPHIC SHEETS UTTLC 3CHUYLKILL RIVER LEGEND. RESIDENTIAL WELL SAMPLE GENERAL GROUND-WATER FLOW DIRECTION [10001 GROUND WATER ELEVATION IFEET ABOVE SEA LEVEL! (JOOO^SURFACE WATER ELEVATION IFEET ABOVE SEA LEVELJ 0 750 1500 /V^- X,^ / \J ^\ ' \v \y ^^ FEET FIGURE 10 REGIONAL GROUND-WATER FLOW MCADOO AREA, PENNSYLVANIA 26 ------- preferentially occur along, rather than across, planer structural zones such as bedding planes and faults. Therefore, in order for ground water from the MKT location to reach the residential wells located along Silverbrook Road, it would have to flow both upgradient and across geologic structure, neither of which are probable. Finally, the well cemented lithology of the Pottsville Formation has been reported to act as a barrier to ground water movement in the area. The residential wells along Still Creek Road are located south of the MKT location, which is nominally considered hydrologically "downgradient." However, the occurrence of the Little Schuylkill River and its proximity to the residential wells induces ground water flow towards the river, or to the southwest on the eastern side of the river. Additionally, the residential wells are located along the axis of the Delano Syncline in the Middle Member of the Mauch Chunk Formation. At the MKT location, this geologic unit is encountered only in the subsurface at a depth of greater than 2000 feet (Figure 6). In order for ground water from the MKT location to reach the residential wells located along Still Creek Road, it would have to flow across several intercepting zones, including bedding planes and four large fault zones, which is unlikely. Given the MKT location and regional geology and hydrogeology, the residential wells and Honey Brook water supply wells are not hydrologically connected to the MKT location. Consequently, there is no complete ground-water migration pathway between the MKT location and nearby residential wells. The off-site ground-water sampling that was conducted in conjunction with the 1991 focused RI included six residential wells (see Figure 10) and the Honey Brook Water Company well(s) (near the MBS location). Ground-water samples were collected in March 1990 and December 1990 from three residential wells located along Silver Brook Road (north of the MKT location) and three residential wells located along Still Creek Road (south of the MKT location). Ground-water samples obtained from residential tap sources were analyzed for TCL and TAL (total only). A summary of organic and inorganic sampling results for the two sampling events is given in Table 6. Only a few compounds were detected in the samples collected from the residential wells. Methylene chloride was most frequently detected, especially in the first sampling event, but it was also detected in QA/QC blanks, thus is a suspected laboratory contaminant. The source of the other organics that were detected is unknown, but their levels are below relevant maximum contaminant concentrations. Several inorganics were also detected in the residential tap water samples, although concentrations were also below relevant maximum contaminant levels. 27 ------- Table 6 Ground-Water Data Surmary Organic Compounds Residential Uells HKT LOCATION 1990 Clymer Orasher Potten Klein Uesner Rltslck Krushlnsky Krushinsky Honey FIELD TRIP TAP TAP TAP TAP TAP TAP TAP TAP (DUP) Brook BLANK BLANK COMPOUNDS (a) VOLATILE! CRQL (b) 3/21 12/20 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 chloroform ethyl ene chloride tHchloroethane 0.3 0.2J 0.8B 0.6B 0.7B 1.0 0.8J 0.9B IB 0.7B IB 2B IB tetrachloroethene 0.5 SEMI-VOLATUES ethoxychlor dleldrln alpha-chlordane .0310 .0083J .00420 1a) Only elements detected are s b) All units ug/1 rlzed. B - Not detected above levels Measured In blanks L - Analyte present. Value reported Is biased low, actual value expected to be higher. P - Analyte present. Quant1 tat1 on *ay not be accurate. J - Analyte present. Reported value My not be accurate or precise. ------- Table 6 (continued) Ground-Hater Data Sumnary Inorganics Residential Wells MKT LOCATION 1990 ELEMENT Aluminum Antimony Arsenl c Barium Cadmium Calcium Chromium Cobalt Copper Iron Lead Magnesium Manganese Nickel Potassium Selenium Silver Sodium Thallium Vandlum Zinc (a) Only el en jb) All units * * * _ A J_i__ CRDL (b) 200 60 10 200 5 5000 10 50 25 100 3 5000 15 40 5000 5 10 5000 10 50 20 ents UQ/1 Clyner TAP 3/21 12/20 297 119P 92 67P 11E3J 9450 14L 9 1990 209L 11 72B 5 4K 9680 7980 934 386 15 34P 1910 1190L 76605 190L 75 40 detected are s (total metals Drasher TAP 3/21 3B 1090J 899 22 2210 7B 530 1680 40 12/19 1360P 304 163L 12 2040P IIP 1760P 11B 26B Pot ten TAP 3/21 12/19 206 3260J 3450P 2300 130 886 26L 7 4 2210 2080P 4B 5P 43 290 971 1360P SB 26 10B Klein Uesner TAP TAP 3/21 12/19 3/21 264 104 38 807J 1240L 9590J 101 44L 35B 9B 586 754 7 3 481 527B 3390 394 46 191 1330 3 1240 770L 23E3 11 13P 20 12/19 156P 94P 9680 260L 2P 3340P 363 22P 865L 25E3L 18P Ritsick TAP 3/21 12/19 182 30 13 12P 68 9520J 8560 6 9790L 525 158 758 28 23 2340 2640P 6B 5L 49 804 430L 14E3 11E3L 127 25 Krushinsky TAP 3/21 186 79 20E3J 1780 2BB 41 4750 150 1910 56600 175 12/19 61P 13000 371 118L 20 3050P 114 58 395P 36300 57 Krushinsky FIELD RINSE TAP (DUP) Honeybrook BLANK BLANK 3/21 12/19 3/21 12/19 3/21 12/19 3/21 12/19 166B 1626 183 4L 51P 26 12400 20E3J 19900 271 9B 120L 216 27B 98 16 4 2K IP 3030P 2040 2070B 106 47 49 350L 249 36400 3980 3640L 1356 4108 816 26K 166 41B 126 unurlzed. L - Analyte present. Value reported Is biased low, actual value expected to be higher. P - Analyte present. Quantitatlon may not be accurate. J - Analyte present. Reported value may not be accurate or precise. K - Analyte present. Reported value may be biased high, actual value expected to be lower. ------- MCADOO-BLAINE STREET (MBS) LOCATION BACKGROUND INFORMATION REVIEW The 1991 focused RI evaluated the results of confirmatory sampling performed by EPA as part of the removal of five underground tanks and approximately 3000 cubic yards of contaminated soil from the MBS location in 1985. Twelve soil samples were collected during 1985 removal activities at locations shown in Figure 11. In addition, 5 surface water samples were collected in 1985 from surface water features in the vicinity of the MBS location, at locations depicted in Figure 12. All samples were analyzed for a complete list of organic compounds _ and inorganics (Priority Pollutant List). The results of confirmatory soil and surface water sampling are given in Tables 7 and 8. The results indicate that a few MBS location-related contaminants (organics and inorganics) remain in the subsurface soil. Regarding surface water, four organics and three inorganics were detected in the sample collected in the sewer outfall. In summary, the results of the historic soil and surface water sampling, and recent sampling of the Honeybrook wells indicate that MBS location related contaminants have not affected nearby surface water features or public water supply wells. 30 ------- -APPROXIMATE LOCATION OF 27* SEWER ss-oo2(6"ai2") ILTER BARRIER FENCE CLEAN" SOIL PILE L- / *SS-009 "DIRTY" SOIL PILE SOLP.LE APPROXIMATE LOCATION OF TOP OF EXCAVATION TOP OF DIVERSION DIKE NOTE'SS-OOt, SS-OO2-6". aSS-OO2-l2*ARE COMPOSITE SAMPLES TAKEN FROM THE 4 LOCATIONS SHOWN «or TO SCALE SOURCE: NUS IRM FINAL REPORT, BLAINE STREET SHE, JULY 1986 FIGURE 11 SOIL SAMPLING LOCATIONS MCADOO-BLAINE STREET LOCATION MCADOO, PENNSYLVANIA ------- M iN v ' ; -; L: -i SW-003 a SW-003A Kel«yrgft'.-.:rr;.V.-'jf S :'.'."* ' leuj-/- FIGURE 12 SURFACE WATER SAMPLING LOCATIONS MCADOO-BLAINE STREET LOCATION MCADOO, PENNSYLVANIA APPROXIMATE SCALE I" 2000' SOURCE: NUS IRM FINAL REPORT, 3LAIME STREET SITE, JULY 1986 POUK ORIGINAL ------- Table 7 Contaminants Detected in Soil - Phase 1 HBS LOCATION (results reported In /jg/kg)"1 Contaminants Monocvcllc Aromatics Total xylenes Haloqenated Aliphatics Methylene chlorld Contaminated* Soil Pile - Composite 001 Ide Phthalate Esters B1s(Z-ethylhexyl)phthai ate Polynuclear Aromatic Hydrocarbons Naphthalene 2-Methylnaphthalene Acenaphthylene Pyrene Fluoroanthene Phenanthrene 4 Acenaphthene *> Fluorene Anthracene Benzo(a)anthracene Chrysene Benzo(k)f1uoranthene Benzompvrene Indeno(l.Z.3-cd)pyrene D1benzo(a,h)anthracene Benzo(g,h.1)perylene Pesticides 180 260 140 24 49 -BHC (llndane) Heptachlor epo> 4.4'-DDE 4.4'-DDT epoxlde Inorganics fag/kg) Chromium Copper Lead Mercury Nickel Zinc Percent Moisture 15 26 99 0.2 119 17 "Uncontamlnated* Soil Pile - Composite OOZ-6 OOZ-1Z 13 19 114 0.3 22 91 Pit Floor 53 "DW Pit Wall 1)05 006 15.000 1.100 1,600 6.500 l.BOO 1.900 150 24 77 120 80 56 12 24 161 0.2 18 93 13 10 4 0.023 0.3 20 10 5 34 32 10 7 29 61 0.3 164 19 9 24 115 0.2 73 12 notes: '"Lab results validated by NUS Corporation Samples 001. 002-6, and 002-12 Mere composites from four areas within each pile. Sample 002-12 was collected at a depth of 12 Inches. Samples 005-007 were collected at a depth of approximately 6-8 feet. 007 35 35 63 180 380 180 93 110 180 130 100 16 91 16 24 115 0.3 102 12 008 30 91 170 340 140 60 89 200 120 96 44 Trench 008A 82 30 57 86 30 14 009 2,400 3.700 "DTP 470 130 540 210 310 1.700 2.600 3.100 1.800 120 460 870 1.400 2.500 2.200 1,900 1.800 2,100 2.400 4.9 12 23 104 0.1 165 17 9 15 114 0.3 87 14 11 23 114 0.2 90 10 11 38 267 0.3 174 16 Sample 002-6 was collected at a depth of 6 inches. Samples 003, 004. 008-010 were collected at a depth of 12 feet. SOURCE: NUS Corporation IRM Final Report - July 1986 ------- Table 8 Contaminants Detected In Surface Water MBS LOCATION (results reported In pg/l)(" SW-004 SW-003 SU-003A Sewer Outfall SW-001 SU-002 West of West of (Downstream Contaminant Reservoir' Bridge Site Site of Site) Halogenated Allphatlcs 1.1.1-Trlchloroethane 200 Methylene chloride 89 Ketones Acetone 21 Phthalate Esters B1s(2-ethy1hexyl)phthalate 4 Inorganics Antimony 15 Chromium 3 3 Copper 64 55 60 Zinc 29 40 36 49 90 (1) Note: Only compounds detected ire presented SOURCE: NUS Corporation IRM Final Report - July 1986 ------- SUMMARY OF SITE RISKS As part of the scope of work of the 1991 focused RI/FS completed for the site, a baseline risk assessment (RA) was performed. The RA typically, evaluates the current and potential future risk(s) to human health and the environment as a result of site-related contaminants. It should be noted that most of the previous risks to human health and environment posed by the McAdoo Associates site were addressed as part of the 1984 IRM ROD removing tanks and contaminated soils at the MBS location, and the 1985 ROD removing contaminated soil and installing a cap on the entire area at the MKT location. A summary of risks to human health and the environment as determined in the RA is set forth below. This section summarizes the findings of the human health risk and ecological risk assessment for the McAdoo Associates site. A summary of the risk assessment, including a description of the contaminants of potential concern, exposure pathways of concern, and potential carcinogenic risks and noncarcinogenic hazards estimated for the pathways quantitatively evaluated in the RI report is included in this section. Contaminants of Potential Concern Of the compounds detected at the McAdoo Associates site, contaminants of potential concern were selected based on several criteria, including evaluating the percent contribution of risk using derived risk factors, and the likely effect of former mining activities and acid mine drainage on the area. Contaminants of potential concern were selected for ground water at the MKT location as well as surface water and sediments in the Little Schuylkill River. Residential wells were not evaluated in the risk assessment since volatile organic compounds detected in these wells were not found to be site-related, although background levels of lead in the regional ground water may be of concern to public health. Twenty-two chemicals were selected as contaminants of potential concern at the McAdoo Associates site including carcinogenic PAHs, volatile organic compounds, and a limited number of inorganics that differed between media. Most of the inorganics present in the ground water, surface water, and sediment can be predominantly attributed to the acid mine drainage in the area, and in most cases were not identified as site-related contaminants of concern. 35 ------- Exposure Assessment The following current land-use exposure pathways were quantitatively evaluated: direct contact with surface water and sediments by children playing in Little Schuylkill River; and ingestion of fish caught from Little Schuylkill River by recreational fisherman. The following future land-use exposure pathways were quantitatively evaluated: ingestion of ground water and absorption and inhalation of chemicals while showering by hypothetical residents at the MKT location; and incidental ingestion and dermal absorption by hypothetical construction workers exposed to subsurface soils at the MBS location. Exposure point concentrations were estimated for each contaminant of potential concern and exposure pathway. Exposure point concentrations and exposure parameters values were combined using a chemical intake equation to estimate exposure (i.e., chronic daily intake [GDI]) for the reasonable maximum exposure (RME) case for each contaminant of potential concern and pathway. Human Health Risk Toxicity criteria and GDIs identified in the Risk Assessment portion of the 1991 focused RI report were combined to quantify potential carcinogenic risks and noncarcinogenic hazards associated with the exposure pathways quantitatively evaluated in the McAdoo Associates site baseline risk assessment. Potential carcinogenic risk was quantified by multiplying the GDI by the slope factor. Conservative exposure assumptions were used to estimate the GDIs in order that potential risk will not be underestimated. The assumptions used are discussed in detail in the 1991 focused RI report. Chemical-specific cancer risks were summed in order to quantify the total cancer risk associated with exposure to all contaminants of concern at the site. Potential carcinogenic risks were expressed as an increased probability of developing cancer over a lifetime (i.e., excess individual lifetime cancer risk). For example, a 10~6 increased cancer risk can be interpreted as an increased risk of 1 in 1,000,000 for developing cancer over a lifetime if an individual is exposed to site-related 36 ------- contaminants. The NCP states that "for known or suspected carcinogens, acceptable levels are generally concentration levels that represent an excess upper bound lifetime cancer risk to an individual of between 10"4 and 10~6." The noncarcinogenic hazard associated with exposure to a chemical was quantified by dividing the GDI by the chemical-specific reference dose (RfD) (note that the RfD values used in the 1991 focused RI risk assessment were obtained from current IRIS and HEAST data base updates.) This ratio is called the hazard quotient. If the hazard quotient exceeds unity (one), then an adverse health effect may occur. If the hazard quotient is less than unity, then adverse noncarcinogenic hazards are unlikely to occur. The potential hazard from all site-related contaminants was evaluated by calculating the hazard index, which is the sum of the chemical-specific hazard quotients. A summary of the potential carcinogenic risks and noncarcinogenic hazards estimated for the exposure pathways quantitatively evaluated in the HcAdoo Associates site baseline risk assessment are presented in Tables 9 through 15 and are summarized below: Current risks to human health related to direct exposure (i.e. children playing in the Little Schuylkill River) to surface water and sediments are within the National Contingency Plan (NCP) acceptable risk range (i.e. greater than 10~4) for carcinogens (predominantly polynuclear aromatic hydrocarbons [PAHs]). Noncarcinogenic hazard was calculated to be below unity (Tables 9 and 10). Therefore, both carcinogenic or noncarcinogenic health effects associated with exposure to site-related contaminants present in surface water or sediment are unlikely to occur. There are no current site-related human health risks associated with the residual subsurface soil contamination at the MBS location. All residual contaminants are located at least 10 to 12 feet below the subsurface, and no current complete human health exposure pathway is identified. Current risks to human health related to ingestion of fish are within the NCP acceptable risk range for carcinogens (bis(2- ethylhexyl)phthalate), and noncarcinogenic hazard is calculated to be below unity (Table 11). Therefore, both carcinogenic or noncarcinogenic health effects associated with ingestion of fish exposed to MKT location-related contaminants present in surface water or sediment are unlikely to occur. 37 ------- Table 9 Potential Carcinogenic Risk Associated with Direct Contact of Surface Hater by Children Playing In Little Schuylklll River for the RUE Case Chealcal RME Chronic Dally Intake (g/kg/day) Slope Factor (mg/kg/day) Weight- of-Evldence Potential Cancer Risk Organlcs: b1s(2-Ethylhexyl)phtha1at* 6.8E-5 1.4E-2 B2 l.OE-6 to oo Potential Noncarclnogenlc Risks Associated with Direct Contact of Surface Water by Children Playing 1n Little Schuylklll River for the RUE Case Chemical (a) Organlcs: b1s(2-Ethylhexyl)phthalate Inorganics: Zinc RME Chronic Dally Intake (^/kg/day) 4.8E-4 6.0E-3 Total RfD (ng/kg/day) 2.0E-2 2.0E-1 Hazard Index: RfD Uncertainty Factor 1000 10 Hazard Quotient 2.4E-2 3.0E-2 2.7E-2 (a) Toxlclty criteria were not available for aluminum and cobalt; therefore, hazard quotients were not estimated for these elements. ------- Table 10 Potential Carcinogenic Risks Associated with Direct Contact with Sediment for Children Playing in Little SchuylMIl River for the RNE Case CO \o Cheaical Organlcs: Benzo(a)pyrene (Equivalent) Inorganics (a): Arsenic Cheaical (b) Inorganics: (a) Arsenic ChroMlwa Zinc Total Hazard Index: RNE CDI for Incidental Ingestlon (.g/kd/day) 1.4E-7 2.4E-6 Potential Sediments for RME CDI for Incidental Ingestlon (g/kd/day) 1.7E-5 5.0E-4 7.1E-4 RME CDI for Dermal Absorption (g/kg/day) 1.4E-7 Slope Factor (g/kg/day)1 1.2E+1 1.7E+0 Total Carcinogenic Risk by Route: Total Carcinogenic Risk for Sediment: Noncarclnogenlc Risks Associated with Direct Children Playing In Little Schuylklll River RME CDI For Dermal Absorption (g/kg/day) Ueight- of- Evidence B2 A Potential Cancer Risk for Ingestlon 1.7E-6 4.1E-6 5.8E-6 Potential Cancer Risk for Dermal Absorption 1.7E-6 _ _ _ 1.7E-6 7.5E-6 Contact with for the RME Case RfD RfD Uncertainty (g/kd/day) Factor l.OE-3 5.0E-3 2.0E-1 1 500 10 1.2E-1 Hazard Quotient for Ingestlon 1.7E-2 l.OE-1 3.6E-3 Hazard Quotient for Dermal Absorption "" "* b) 'Toxlclty criterfa were not available for b'enzo(a)pyrene (equivalent), cobalt, and lead; therefore, hazard quotients were not estimated for these chemicals. ------- Table 11 Potential Carcinogenic Risk Associated with Ingestion of Fish from Little Schuylkill River Under Current Land-Use Conditions for the RME Case Chemical Organics: bis(2-Ethylhexyl)phtha1ate Chronic Daily Intake (mg/kg/day) 1.1E-3 Slope Factor (mg/kg/day)-' 1.4E-2 Weight of Evidence B2 Potential Cancer Risk 1.5E-5 Potential Noncarcinogenic Risks Associated with Ingestion of Fish from Little Schuylkill River Under Current Land-Use Conditions for the RME Case Chemical (a) Organics: b1 s (2- Ethy 1 hexy 1 ) ph thai ate RME Chronic Daily Intake (mg/kg/day) 2.5E-3 RfD (ng/kg/day) 2.0E-2 Total Hazard Index: RfD Uncertainty Factor 1000 Hazard Quotient 1.3E-1 1.3E-1 (a) Toxicity criteria were not available for aluminum and cobalt; therefore, hazard quotients were not estimated for these elements. 40- ------- The potential risks from multiple exposure pathways under current land-use conditions are within the NCP acceptable risk range for carcinogens. the noncarcinogenic hazard was calculated to be below unity (Table 12). Future risks to human health related to ingestion of and exposure via dermal absorption and inhalation to ground water from the MKT location exist (Tables 13 and 14) . Based on the scenario of ingestion of and exposure to mine pool ground water, the potential carcinogenic risk, primarily associated with 1, 2 dichloropropane, is 1 x 10~3, and the hazard index (noncarcinogenic hazard) is 1. Therefore, there is potential for carcinogenic risk and noncarcinogenic hazard associated with future mine pool ground water ingestion and exposure. However, it is unlikely that the mine pool will ever be used for water supply given the low pH of the water as a result of acid mine drainage, low expected well yields, and overall poor natural background water quality. Future risks to human health related to exposure to subsurface soil at the MBS location via future construction activities (construction worker scenario of exposure via dermal absorption and incidental ingestion) are within the NCP acceptable risk range for carcinogens (PAHs), and noncarcinogenic hazard is calculated to be below unity (Table 15). Therefore, carcinogenic or noncarcinogenic health effects associated with exposure to residual contaminants during any future MBS location construction activities are unlikely to occur. ECOLOGICAL RISK There are no federal or Commonwealth of Pennsylvania threatened, endangered species, or species of concern observed in the vicinity of the McAdoo Associates site. The aquatic community of the Little Schuylkill River is severely affected by AMD, indicating high ecological risk. However, given the limited amount of MKT location-related contamination in the surface water and sediment, the impact of the MKT location to the aquatic community is minimal. No ecological risk is identified with respect to the MBS location. 41 ------- Table 12 Potential Risks from Multiple Exposure Pathways under Current Land-Use Conditions Potential Carcinogenic Risk Pathway for the RME Case Children Playing in Little Schuylkill River: Ingestion of sediments Dermal absorption from sediments Dermal absorption from surface water Subtotal for Pathway: Fishing in Little Schuylkill River Total for all Routes (a): 6E-6 2E-6 1E-6 9E-6 2E-5 3E-5 Hazard Index for RME Case 0.12 0 0.03 0.15 0.13 0.28 (a) ' It should be noted that these risk estimates are conservative upper-bound estimates that assume that an individual is exposed according to the RME scenario outlined in this report for all exposure pathways evaluated; and thus represents the maximum possible risk under current land-use conditions. 42 ------- Table 13 Potential Carcingenic Risks Associated with Ingest ion and Dermal Absorption Exposure of from Use of Ground Water at the MKT Location by Hypothetical Residents for the RHE Case Chemical RHE Chronic Daily Intake (mg/kg/day) Slope Factor (mg/kg/dayr Ueight- of-Evidence Potential Cancer Risk Organics: 1,1-Dichloroethane 1,1-Dichloroethene 1,2-Oichloropropane 6.0E-4 1.2E-4 1.2E-2 9.1E-2 6.0E-1 6.8E-2 C C B2 5.5E-5 7.2E-5 6.2E-A Total Carcinogenic Risk: 1E-3 Potential Noncarcinogenic Risks Associated with Ingest ion and Dermal Absorption Exposure from Use of Ground Water at the MKT Location by Hypothetical Residents for the RHE Case Chemical (a) RHE Chronic Daily Intake (mg/kg/day) RfD (mg/kg/day) RfD Uncertainty Factor Hazard Quotient Organ!cs: 1,1-Dichloroethane 1,1-Dichloroethene 1,1,1-Trichloroethane 1.4E-3 2.9E-4 1.0E-2 1.0E-1 9.0E-3 9.0E-2 1000 1000 1000 1.4E-2 3.2E-2 1.1E-1 Inorganics: Silver Zinc 2.0E-3 3.5E-2 3.0E-3 2.0E-1 2 10 Total Hazard Index: 6.7E-1 1.BE-1 2.7E+0 (a) Toxicity criteria were not available for aluminum, cobalt and 1,2-dichloropropane. ------- Table 14 Potential Carcinogenic Risks Associated with the Inhalation of VOCs While Showering for Hypothetical Residents at the MKT Location for the RME Case Chemical 1,1-Oichloroethane 1,1-Oichloroethene 1 ,2-01 chl oropropane RME Chronic Daily intake (rag/kg/day) 2.3E-4 4.8E-5 4.8E-3 Slope Weight- Factor of- (mg/kg/day)"' Evidence 9.1E-2 C 1.2E+0 C 6.8E-2(a) 82 Total Carcinogenic Risk: Potential Cancer Risk 2.1E-5 5.8E-5 3.2E-4 4.0E-4 Potential Noncarcinogenic Risks Associated with Inhalation of VOCs While Showering for Hypothetical Residents at the MKT Location for the RME Case Chemical (b) 1 , 1-01 chl oroethane 1 , 1-01 chl oroethene 1 ,1 , 1-Tri chl oroethane RME Chronic Daily Intake (mg/kg/day) 5.7E-4 1.2E-4 4.8E-3 RfD mg/kg/day) l.OE-1 9.0E-3(c) 3.0E-1 RfD Uncertainty Factor 1000 1000 1000 Hazard Quotient 5.7E-3 1.3E-2 1.6E-2 Total Hazard Index: 3.5E-2 No inhalation slop* factor (SF) was available for 1,2-dl chl oropropane for this pathway. In order to calculate risk, the ore! SF was used. (b) (e) No oral or Inhalation RfDs were available for 1,2-di chl oropropane; therefore, the estimated risk does not include this cheaical. No Inhalation RfD was available for 1.1-dichloroethene for this pathway. risk, the oral RfD wes used. In order to calculate 44 ------- Table 15 Potential Carcinogenic Risks Associated with Direct Contact with Subsurface Soils by Hypothetical Construction Workers MBS Location Organi cs: Benzo(a)pyrene (Equivalent) gamM-BHC DOT (total) b1s(2-Ethylhexyl)phthalate Heptachlor Epoxide Hethylene Chloride Exposure Point Concentration (ug/kg) 5.271 44 107 6,500 4.9 470 RME CDI (mg/kg/day) 3.1E-8 2.6E-10 6.3E-10 3.8E-8 2.9E-11 Ong/kg/day)" 11.5 1.3 0.34 0.014 9.1 5.6E-9 7.5E-3 Total Carcinogenic Risk: Potential Carcinogenic Risk 3.6E-7 3.4E-10 2.1E-10 5.3E-10 2.6E-10 4.2E-11 4E-7 Potential Noncardnogenlc Hazards Chemical Organic* (ug/kg): Acetone gamna-BHC DDT (total) b1 s (2-Ethyl hexyl ) phthal ate Heptachlor Epoxide Methyl ene Chloride Exposure Point Concentration 130 44 107 6,500 4.9 470 RME CDI (mg/kg/day) 6.0E-7 l.OE-7 2.5E-7 1.5E-5 1.1E-8 2.2E-6 RFD (mg/kg/day) 1E-1 3E-4 5E-4 2E-2 1.3E-5 6E-2 Hazard Quotient 6.0E-6 3.3E-4 5.0E-4 7.5E-4 8.5E-4 3.7E-5 PolycvcHc Aromatic Hydrocarbons Anthracene Ft ouranthene F1 ourtne Napthalene Pyren« Xylenes (total) Inorganics (mo/kg); Chromium Copper Mercury Z1nc 870 3,100 460 210 2,600 2.400 16 38 0.3 174 2.0E-6 7.1E-6 1.1E-6 4.8E-7 6.0E-6 5.5E-6 2.2E-S 5.3E-S 4.2E-7 2.4E-4 3E-1 4E-3 4E-2 4E-3 3E-2 2E+0 5E-3 1.3E+0 3E-4 2E-1 Hazard Index 6.7E-6 1.8E-3 2.8E-5 1.2E-4 2.0E-4 2.8E-6 4.4E-3 4.1E-5 1.4E-3 1.2E-3 1E-2 45 ------- SELECTED REMEDY After consideration of the existing and future risks posed to human health and environment, EPA's selected remedy for the McAdoo Associates site is No Further Action, with monitoring. Based on information collected to date, the EPA has determined that no additional remedial actions other than those already implemented are required to ensure protection of human health and the environment beyond ground-water monitoring. Monitoring at the MKT location (which is already proposed as part of the 1985 ROD) will be expanded to include all of the existing monitoring wells. Samples from these wells shall be analyzed for volatile organic compounds and nine inorganics. Three inorganics (cobalt, silver, and zinc) are included because they were selected as contaminants of concern for ground water during the RI for this ROD, and the other six inorganics (beryllium, cadmium, chromium, nickel, lead, and cyanide) were selected in view of their concentrations detected in soil samples collected as part of the RI for the 1985 ROD for this site. At the MBS location, four monitoring wells will be installed and long-term ground-water monitoring will be performed. Samples from these wells shall be analyzed for volatile and semi- volatile organic compounds and TAL inorganics. The duration of ground-water monitoring at both locations will be 30 years. Although the ground water in the mine pool is contaminated with 1, 2 dichloropropane, it does not result in any additional level of risk since there is no complete pathway to affect human health. If the mine pool were considered for use as a source of potable water, the technical difficulties associated with treating this ground water would prevent any such project from occurring. These difficulties are primarily associated with the treatment that would be required to make the water potable, namely the large amount of lime that would be required to adjust the pH of the highly acidic water, and the treatment that would be required to reduce the high concentrations of metals present. The pH adjustment and metals treatment alone would result in the generation of large amounts of lime sludge that would need to be disposed of either in a municipal or possibly a hazardous waste disposal facility. Furthermore, once the pre-treatment is complete, it is likely that additional treatment for the 1, 2 dichloropropane would be required, as this compound would probably volatilize during the exothermic reaction and vigorous mixing associated with the pre-treatment process. Therefore, as discussed above, it would be unreasonable to assume that this water resource, which has been severely affected by natural conditions, would ever provide a complete pathway for human exposure to necessitate any remedial action beyond the No Further Action alternative. The present worth cost of this No Further Action, with Monitoring remedy is $503,540. The breakdown of this cost is $69,540 for the 46 ------- capital costs (primarily monitoring well installation) and $434,000 for monitoring costs. Because this remedy will result in hazardous substances remaining on-site, a review will be conducted within five years after the commencement of this remedial action in accordance with Section 121(c) of CERCLA, 42 U.S.C. Section 9621(c), to ensure that human health and the environment continue to be adequately protected by the remedy. It should be noted that previous remedial actions shall also be reviewed in the future. DOCUMENTATION OF SIGNIFICANT CHANGES The Proposed Plan for the McAdoo Associates site was released for public comment on July 22, 1991. The Proposed Plan identified the no further action, with monitoring alternative as the EPA preferred alternative. EPA reviewed all written and verbal comments submitted during the public comment period. Based on the review of these comments, it was determined that no significant changes to the preferred alternative, as it was originally identified in the Proposed Plan (and presented in this ROD), were necessary. 47 ------- MCADOO ASSOCIATES SITE OU2 ADMINISTRATIVE RECORD FILE * INDEX OF DOCUMENTS II. REMEDIAL ENFORCEMENT PLANNING 1 . Report: McAdoo Associates Site, Final Cover System 100 Percent Design Package, prepared by Roy F. Weston, Inc., 12/7/90. P. 200001-200160. A transmittal letter is attached. * Administrative Record File available 7/23/91, updated 7/30/91, updated 9/27/91. Note: Information pertaining to McAdoo OU2 can also be found in the McAdoo OU1 Administrative Record File, located at the same site repository and file as this record. ------- III. REMEDIAL RESPONSE PLANNING 1. Report: Work Plan, Volume I, (Technical), Remedial Investigation/Feasibility Study, prepared by Tetra Tech, Inc., 9/90. P. 300001-300107. 2. Memorandum to Mr. John S. Mellow, Pennsylvania Department of Environmental Resources (PADER), from Ms. Kate Crowley, PADER, re: Comments on the work plan, 11/8/90. P. 300108-300108. 3. Letter to Mr. Tad Yancheski, Tetra Tech, Inc., from Mr. Eugene Dennis, U.S. EPA, re: Comments on the work plan, 11/14/90. P. 300109-300112. 4. Memorandum to Mr. Eugene Dennis, U.S. EPA, from Mr. Mike Ellickson, U.S. EPA, re: Comments on the project plan, 12/4/90. P. 300113-300129. 5. Letter to Mr. Eugene Dennis, U.S. EPA, from Mr. Joseph D'Onofrio, PADER, re: Comments on the work plan, 12/7/90. P. 300130-300130. 6. Letter to Mr. Ted [sic] Yancheski, Tetra Tech, Inc., from Mr. Eugene Dennis, U.S. EPA, re: Comments on the work plan and Field Sampling Plan, 12/12/90. P. 300131-300133. 7. Letter to Mr. Eugene Dennis, U.S. EPA, from Mr. Tad B. Yancheski, Tetra Tech, Inc., re: Revisions to McAdoo Project Plans, 12/17/90. P. 300134-300174. The amended pages are attached. 8. Letter to Mr. Tad Yancheski, Tetra Tech, Inc., from Mr. Eugene Dennis, U.S. EPA, re: Approval of work plan,'1/14/91. P. 300175-300175. 9. Report: Feasibility Study Report for Surface Water, Sediment, Ground-Water, and Blaine Street Elements, prepared by Tetra Tech, Inc., 7/91. P. 300176- 300290. ------- 10. Report: Remedial Investigation Report for Surface Water, Sediment, Ground-Water, and Elaine Street Elements, prepared by Tetra Tech, Inc., 7/91. P. 300291-300630. 11. Report: Remedial Investigation Report for Surface Water, Sediment, Ground-Water, and Blaine Street Elements Appendices, prepared by Tetra Tech, Inc., 7/91. P. 300631-300899." 12. Letter to Mr. Tad Yancheski, Tetra Tech, Inc., from Mr. Eugene Dennis, U.S. EPA, re: Comments on the Draft Remedial Investigation Report. 7/18/91. P. 300900-300909. 13. Letter to Mr. Tad Yancheski, Tetra Tech, Inc., From Mr. Eugene Dennis, U.S. EPA, re: Comments on the Feasibility Study for McAdoo, 7/18/91. P. 300910- 300913. 14. Letter to Mr. Eugene Dennis, U.S. EPA, from Mr. Tad B. Yancheski, Tetra Tech, Inc., re: Transmittal of revisions to the RI/FS, 7/22/91. P. 300914-301086. 15. U.S. EPA Proposed Plan, McAdoo Associates Superfund Site, 7/22/91. P. 301087-301097. 16. Letter to Mr. Eugene Dennis, U.S. EPA, from Mr. Joseph D'Onofrio, PADER, re: Comments on draft proposed plan, 7/17/91. P. 301098-301099. 17. Letter to Mr. Eugene Dennis, U.S. EPA, from Mr. Tad B. Yancheski, Tetra Tech, Inc., re: Transmittal of Revised Remedial Investigation Study Report, Appendix B,- 7/23/91. P. 301112-301254. The report is attached. ------- V. COMMUNITY INVOLVEMENT/ CONGRESSIONAL CORRESPONDENCE/IMAGERY 1. U.S. EPA Public Meeting, McAdoo Superfund Site, 8/8/91. P. 500001-500089. 2. Letter to Ms. Francesca DiCosmo, U.S. EPA, from Mr Michael W. Ziegler, re: Comments to the proposed clean up alternative, 8/9/91. P. 500090-500090. ------- BIBLIOGRAPHY OF SITE SPECIFIC DOCUMENTS 1. Settlement and Cover Subsidence of Hazardous Waste Landfills: Project Summary, prepared by M. W.L. Murphv and M. P.A. Gilbert, 5/1/85. EPA-600/S2-85-035 2 . Review of In-place Treatment Techniques for Contaminated Surface Soils - Vol. 1: Technical Evaluation, prepared by OSWER/OERR/ORD/MERL, 9/19/84. EPA/540/2-84-003a 3 . Final RCRA Comprehensive Ground-Water Monitoring Evaluation (CME) Guidance Document, prepared by M. G.A. Lucero and OWPE, 12/19/86. OSWER #9950.2 4 . Ground-Water Protection Strategy, prepared by the Office of Ground-Water Protection, 8/1/84. EPA/440/6-84-002 5. RCRA Ground-Water Monitoring Technical Enforcement Guidance Document, TEGD: Executive Summary, prepared by M. G.A. Lucero and OWPE, 7/1/87. OSWER #9950.1-a 6. CERCLA Compliance with Other Laws Manual - CERCLA Compliance with State Requirements [Quick Reference Fact Sheet], prepared by OSWER, 12/1/89. OSWER #9234.2-05FS 7. CERCLA Compliance with Other Laws Manual - CERCLA Compliance with the CWA and SDWA [Quick Reference Fact Sheet], prepared by OSWER, 2/1/90. OSWER #9234.2-06FS 8. CERCLA Compliance with Other Laws Manual - Overview of ARARs - Focus on ARAR Waivers [Quick Reference Fact Sheet], prepared by OSWER, 12/1/89. OSWER #9234.2-03FS 9. RCRA Ground-Water Monitoring Technical Enforcement Guidance Document (TEGD), prepared by EPA, 9/1/86. OSWER #9950.1 ------- |