Soil: Low Risk

Contamination has the potential to migrate the subsurface soil, groundwater, which can discharge to the surface waters. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 23-19 Gravel cover minimizes the potential for direct human contact with the surface soil at the site. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 23-21)

Contaminants: PCB 0.0054 mg/kg

Groundwater: Low Risk

All groundwater-monitoring wells are located within the site. Using the existing data, migration of contamination in groundwater cannot be determined. (Earth Tech, Inc., July 1998, Draft Site Investigation Report for IRP Site 35, p. 15) NAGroundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.01 ug/L Chlordane 0.04 ug/L Nickel-56 1.1 pCi/L Methylene Chloride 2.0 ug/L Copper and compounds 2.3 ug/L Acetone 4.0 ug/L Toluene 14.0 ug/L Zinc 40.5 ug/L

Soil: Low Risk

The migration of soil contamination cannot be determined using the existing data since the sample locations are all within the site boundaries. (Earth Tech, Inc., July 1998, Draft Site Investigation Report for IRP Site 35, p. 11) Direct human exposure (through incidental ingestion of, and dermal contact with the soil) can occur only if intrusive actions bring the subsurface soil to the surface. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 28-24)

Contaminants: Chlordane 9.5e-07 mg/kg Dieldrin 1.7e-06 mg/kg 4,4-DDT 7.6e-06 mg/kg 4,4-DDD 8.9e-06 mg/kg 4,4-DDE 4.4999999999999996e-05 mg/kg Beryllium and compounds 0.0008900000000000001 mg/kg Copper and compounds 0.004900000000000001 mg/kg Antimony and compounds 0.0077 mg/kg Lead 0.0126 mg/kg Arsenic 0.0294 mg/kg Chromium 0.0347 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

Groundwater has the potential to migrate surface water. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 21-39) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Aldrin 0.01 ug/L Dieldrin 0.01 ug/L 1,2-Dichloroethane (EDC) 0.25 ug/L Chloroform 1.03 ug/L Antimony and compounds 5.66 ug/L Thallium-194 17.1 pCi/L Arsenic 23.4 ug/L cis-1,2-Dichloroethylene 25.3 ug/L Trichloroethylene (TCE) 47.0 ug/L Lead 58.8 ug/L Manganese and compounds 1060.0 ug/L Barium 1950.0 ug/L

Sediment (Fresh): Low Risk

Contamination may be migrating by surface runoff to wetland adjacent to the Back River. Using existing data, contaminant migration cannot be determined at this time. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 4-3) Contamination may impact aquatic organisms by ingestion and dermal contact. Terrestrial organisms may be exposed to contamination by foraging on aquatic organisms. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 2-9)

Contaminants: Arsenic 0.0181 mg/kg Lead 0.771 mg/kg Iron 42.7 mg/kg

Sediment (Human): Low Risk

Contamination may be migrating by surface runoff to wetland adjacent to the Back River. Using existing data, contaminant migration cannot be determined at this time. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 4-3) The receptors that may be exposed by ingestion or dermal contact to contamination from sediments are the child trespasser and groundskeeper. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 2-8)

Contaminants: Arsenic 0.0181 mg/kg Lead 0.771 mg/kg Iron 42.7 mg/kg

Soil: Low Risk

Surface soil contamination can potentially migrate to the outdoor air and into the Back River (surface water). Subsurface soil contamination can migrate into the groundwater. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 21-39) Direct human contact with surface soil can potentially expose human receptors to contamination by ingestion or dermal contact with the soil. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 21-41)

Contaminants: Dieldrin 0.000177 mg/kg Chromium 0.0574 mg/kg Arsenic 0.178 mg/kg Barium 0.874 mg/kg Benzo(a)Pyrene 1.01 mg/kg Benzo(b)Fluoranthene 1.37 mg/kg Lead 6.62 mg/kg Copper and compounds 41.5 mg/kg

Surface Water: Low Risk

Surface runoff to wetlands adjacent to the Back River is an avenue of contaminant transport. The migration cannot be determined using existing data. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 4-3) The child trespasser and groundskeeper may be exposed to contamination by ingestion, but this is unlikely. Contamination exposure of the fish consumer is insignificant. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 2-8)

Contaminants: Antimony and compounds 1.75 ug/L Benzene 2.2 ug/L Lead 33.1 ug/L Thallium 43.0 ug/L

Surface Water (Fresh): Low Risk

Surface runoff to wetlands adjacent to the Back River is an avenue of contaminant transport. The migration cannot be determined using existing data. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 4-3) Contamination may impact aquatic organisms by ingestion and dermal contact. Terrestrial organisms may be exposed to contamination by foraging on aquatic organisms. (Radian International, May 1998, Draft Work Plan for RI at LF-17, p. 2-9)

Contaminants: Antimony and compounds 1.75 ug/L Benzene 2.2 ug/L Lead 33.1 ug/L Thallium 43.0 ug/L

Groundwater: Low Risk

Groundwater contamination migration cannot be determined using existing data. (Radian International, December 1997, MAP, p. K/L-19) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Toluene 6.0 ug/L Benzene 1400.0 ug/L

Soil: Low Risk

Migration of contamination from the soil cannot be determined using existing data. (Radian International, December 1997, MAP, p. K/L-19) Base workers may be exposed to contamination by intrusive actions. (Radian International, December 1997, MAP, p. E-SS-04 CSM)

Contaminants: Lead 0.0629 mg/kg

Soil: Medium Risk

Proximity to Back River

Contaminants: Benzo(a)Pyrene 0.0016899999999999999 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Sediment (Fresh): Medium Risk

Sample results indicate that contamination may be migrating off-site. Further investigation would be needed to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report, Figure 4-15) Terrestrial and aquatic organisms have the potential to be exposed to contamination by ingestion. Aquatic organisms may also be exposed by dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 7-6)

Contaminants: Bis(2-Ethylhexyl)Phthalate 0.00016 mg/kg Fluorene 0.00068 mg/kg Silver and compounds 0.020399999999999998 mg/kg Arsenic 0.0414 mg/kg Lead 0.0584 mg/kg Barium 0.07100000000000001 mg/kg Vanadium 0.0841 mg/kg Zinc 0.212 mg/kg Manganese and compounds 0.249 mg/kg Chromium 0.47900000000000004 mg/kg Aluminum 25.2 mg/kg Iron 47.5 mg/kg

Sediment (Human): Medium Risk

Sample results indicate that contamination may be migrating off-site. Further investigation would be needed to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report, Figure 4-15) The adult hunter/fisher and child trespasser may be potentially exposed to contamination in surface water. (IT Corporation, August 1997, Draft RI Report, Figure 6-3)

Contaminants: Bis(2-Ethylhexyl)Phthalate 0.00016 mg/kg Fluorene 0.00068 mg/kg Silver and compounds 0.020399999999999998 mg/kg Arsenic 0.0414 mg/kg Lead 0.0584 mg/kg Barium 0.07100000000000001 mg/kg Vanadium 0.0841 mg/kg Zinc 0.212 mg/kg Manganese and compounds 0.249 mg/kg Chromium 0.47900000000000004 mg/kg Aluminum 25.2 mg/kg Iron 47.5 mg/kg

Soil: Medium Risk

All soil sample locations are within the site boundaries; therefore, contaminant migration, if any, cannot be determined using available data. (IT Corporation, August 1997, Draft RI Report, Figure 4-11a) The groundskeeper, adult hunter/fisher, and child trespasser may be potentially exposed to contamination in the soil by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-3)

Contaminants: Dibenz[ah]anthracene 9.3e-05 mg/kg Aroclor 1254 0.00023 mg/kg Benzo(a)Pyrene 0.00042 mg/kg Arsenic 0.0555 mg/kg Vanadium 0.107 mg/kg Manganese and compounds 1.03 mg/kg Aluminum 29.900000000000002 mg/kg Iron 85.5 mg/kg

Surface Water (Fresh): Medium Risk

Sample results indicate that contamination may be migrating off-site. Further investigation would be needed to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report, Figure 4-15) Terrestrial organisms may be exposed to contamination by ingestion. Aquatic organisms may be exposed to contamination by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 7-6)

Contaminants: Lead 4.0 ug/L Chromium 13.5 ug/L Manganese and compounds 179.0 ug/L Aluminum 878.0 ug/L Iron 4120.0 ug/L

Groundwater: Low Risk

All sample locations are within site boundaries; therefore, contaminant migration, if any, cannot be determined using available data. (IT Corporation, August 1997, Draft RI Report, Figure 4-13a) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.05 ug/L Heptachlor 0.06 ug/L Arsenic 13.6 ug/L Benzene 15.0 ug/L Lead 50.8 ug/L Chlorobenzene 240.0 ug/L Barium 389.0 ug/L Aluminum 454.0 ug/L Manganese and compounds 2030.0 ug/L Iron 106000.0 ug/L

Surface Water: Low Risk

Sample results indicate that contamination may be migrating off-site. Further investigation would be needed to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report, Figure 4-15) The adult hunter/fisher and child trespasser may be potentially exposed to contamination in surface water. (IT Corporation, August 1997, Draft RI Report, Figure 6-3)

Contaminants: Lead 4.0 ug/L Chromium 13.5 ug/L Manganese and compounds 179.0 ug/L Aluminum 878.0 ug/L Iron 4120.0 ug/L

Groundwater: High Risk

All groundwater-sampling wells are located with in the site boundaries. Extent of migration, if any, could not be determined. (Radian International, August 1997, RI Report, p. 9-7) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Aldrin 0.01 ug/L Heptachlor Epoxide 0.04 ug/L Dieldrin 0.05 ug/L Arsenic 10.9 ug/L Manganese and compounds 166.0 ug/L Aluminum 4330.0 ug/L Iron 14500.0 ug/L

Sediment (Fresh): High Risk

Extent of migration, if any, could not be determined using available data. (Radian International, August 1997, RI Report, p. 9-11) The Back River, the tidal marsh adjacent to the site and the pond supports a variety of biota including various fish, shellfish, waterfowl, wading birds, mollusks, and aquatic invertebrates. (Radian International, August 1997, RI Report, p. 9-32, 9-34)

Contaminants: Mercury 0.00020300000000000003 mg/kg Lead 0.0521 mg/kg Manganese and compounds 0.3 mg/kg Aluminum 27.6 mg/kg Iron 31.6 mg/kg

Surface Water (Fresh): High Risk

Extent of migration, if any, could not be determined using available data. (Radian International, August 1997, RI Report, p. 9-9) The Back River, the tidal marsh adjacent to the site, and the pond support a variety of biota including various fish, shellfish, waterfowl, wading birds, mollusks, and aquatic invertebrates. (Radian International, August 1997, RI Report, p. 9-32, 9-34)

Contaminants: Aldrin 1.21 ug/L Mercury 3.64 ug/L Thallium 7.12 ug/L Arsenic 450.0 ug/L Lead 1440.0 ug/L Manganese and compounds 13800.0 ug/L Aluminum 423000.0 ug/L Iron 736000.0 ug/L

Soil: Medium Risk

Surface soil has the potential to migrate to the receptors and into surface water runoff into the Back River. Migration cannot be confirmed using available data. (Radian International, August 1997, RI Report, p. 9-13, 9-19) Hunters may be exposed to surface soil by ingestion or dermal contact. (Radian International, August 1997, RI Report, p. 9-19)

Contaminants: Beryllium and compounds 0.000724 mg/kg Indeno(1,2,3-cd)Pyrene 0.0035499999999999998 mg/kg Benzo(a)Pyrene 0.005940000000000001 mg/kg Benzo(b)Fluoranthene 0.0126 mg/kg Benzo(k)Fluoranthene 0.0126 mg/kg Arsenic 0.0177 mg/kg Manganese and compounds 0.34 mg/kg Aluminum 8.63 mg/kg Iron 26.5 mg/kg

Sediment (Marine): Medium Risk

Extent of migration, if any, could not be determined using available data. (Radian International, August 1997, RI Report, p. 9-11) The Back River, the tidal marsh adjacent to the site and the pond supports a variety of biota including various fish, shellfish, waterfowl, wading birds, mollusks, and aquatic invertebrates. (Radian International, August 1997, RI Report, p. 9-32, 9-34)

Contaminants: Arsenic 0.0169 mg/kg

Surface Water: Medium Risk

Extent of migration, if any, could not be determined using available data. (Radian International, August 1997, RI Report, p. 9-9) On-site surface water was inaccessible due to dense vegetation, underbrush, and grasses. (Radian International, August 1997, RI Report, p. 9-21)

Contaminants: Aldrin 1.21 ug/L Mercury 3.64 ug/L Thallium 7.12 ug/L Arsenic 450.0 ug/L Lead 1440.0 ug/L Manganese and compounds 13800.0 ug/L Aluminum 423000.0 ug/L Iron 736000.0 ug/L

Sediment (Human): Low Risk

Extent of migration, if any, could not be determined using available data. (Radian International, August 1997, RI Report, p. 9-11) On-site sediment was inaccessible due to dense vegetation, underbrush, and grasses. (Radian International, August 1997, RI Report, p. 9-20)

Contaminants: Mercury 0.00020300000000000003 mg/kg Arsenic 0.0169 mg/kg Lead 0.0521 mg/kg Manganese and compounds 0.3 mg/kg Aluminum 27.6 mg/kg Iron 31.6 mg/kg

Groundwater: Low Risk

All groundwater-sampling wells are located with in the site boundaries. (Radian International, August 1997, RI Report, p. 10-6) Groundwater has the potential to migrate to the Back River. (Radian International, August 1997, RI Report, p. 10-19) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Aldrin 0.01 ug/L Heptachlor Epoxide 0.02 ug/L Heptachlor 0.02 ug/L Dieldrin 0.04 ug/L Chloroform 1.12 ug/L Bis(2-Ethylhexyl)Phthalate 5.74 ug/L Arsenic 17.7 ug/L Vanadium 45.2 ug/L Manganese and compounds 1820.0 ug/L Iron 4500.0 ug/L Aluminum 5620.0 ug/L

Sediment (Fresh): Low Risk

The sediment in the surface runoff potentially can migrate to the Back River from the site marshland. (Radian International, August 1997, RI Report, p. 10-19) Exposure is complete pathways for both terrestrial and aquatic species. The pond and surrounding wetland provide habitat for aquatic and benthic invertebrates and fiddler and blue crabs. (Radian International, August 1997, RI Report, p. 10-34 to 10-35)

Contaminants: Mercury 0.000412 mg/kg Dieldrin 0.0007199999999999999 mg/kg Iron 16.9 mg/kg Aluminum 17.6 mg/kg

Sediment (Human): Low Risk

The sediment in the surface runoff potentially can migrate to the Back River from the site marshland. (Radian International, August 1997, RI Report, p. 10-19) Exposure was not likely since the area is elevated above the marshland. There is limited access to the site marshland given the presence of the Mile-Long Building and minimal roadway (Radian International, August 1997, RI Report, p. 10-21)

Contaminants: Mercury 0.000412 mg/kg Dieldrin 0.0007199999999999999 mg/kg Arsenic 0.009970000000000001 mg/kg Lead 0.42 mg/kg Iron 16.9 mg/kg Aluminum 17.6 mg/kg

Soil: Low Risk

Surface soil has the potential to migrate into surface water runoff that flows into the Back River. Extent of migration could not be determined using available data. (Radian International, August 1997, RI Report, p. 10-12, 10-19) The groundskeeper can be exposed to contaminants during lawn care activities. (Radian International, August 1997, RI Report, p. 10-20)

Contaminants: Dieldrin 0.00011899999999999999 mg/kg Indeno(1,2,3-cd)Pyrene 0.0015 mg/kg Benzo(a)Pyrene 0.00242 mg/kg Benzo(b)Fluoranthene 0.00477 mg/kg Arsenic 0.015300000000000001 mg/kg Manganese and compounds 0.681 mg/kg Lead 9.998 mg/kg Aluminum 10.4 mg/kg Iron 26.8 mg/kg

Sediment (Marine): Low Risk

The sediment in the surface runoff potentially can migrate to the Back River from the site marshland. (Radian International, August 1997, RI Report, p. 10-19) Exposure is complete pathways for both terrestrial and aquatic species. The pond and surrounding wetland provide habitat for aquatic and benthic invertebrates and fiddler and blue crabs. (Radian International, August 1997, RI Report, p. 10-34 to 10-35)

Contaminants: Arsenic 0.009970000000000001 mg/kg Lead 0.42 mg/kg

Surface Water: Low Risk

The surface water runoff from the site marshland potentially can migrate to the Back River. (Radian International, August 1997, RI Report, p. 10-19) Exposure was not likely since the area is elevated above the marshland. There is limited access to the site marshland given the presence of the Mile-Long Building and minimal roadway access. (Radian International, August 1997, RI Report, p. 10-21)

Contaminants: Mercury 0.06 ug/L Arsenic 2.92 ug/L Lead 29.6 ug/L Aluminum 6890.0 ug/L Iron 8510.0 ug/L Magnesium-28 583000.0 pCi/L

Surface Water (Fresh): Low Risk

The surface water runoff from the site marshland potentially can migrate to the Back River. (Radian International, August 1997, RI Report, p. 10-19) Exposure is complete pathways for both terrestrial and aquatic species. The pond and surrounding wetland provide habitat for aquatic and benthic invertebrates and fiddler and blue crabs. (Radian International, August 1997, RI Report, p. 10-34 to 10-35)

Contaminants: Mercury 0.06 ug/L Arsenic 2.92 ug/L Lead 29.6 ug/L Aluminum 6890.0 ug/L Iron 8510.0 ug/L Magnesium-28 583000.0 pCi/L

Groundwater: Low Risk

Groundwater contamination has the potential to migrate to the Back River that can potentially contaminate fish/shellfish, sediment, and outdoor air. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 27-28) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor 0.01 ug/L Dieldrin 0.02 ug/L Aldrin 0.03 ug/L Heptachlor Epoxide 0.06 ug/L 4,4-DDD 0.07 ug/L

Soil: Low Risk

Contamination in the subsurface soil has the potential to migrate to the groundwater, which can potentially contaminate the Back River. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 27-28) Direct human exposure to contamination in the subsurface soil can only occur if intrusive actions bring the subsurface soil to the surface. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 27-30)

Contaminants: Dieldrin 4.4e-05 mg/kg Chlordane 0.0007880000000000001 mg/kg

Groundwater: Low Risk

Groundwater can migrate into the indoor air and into the Back River. Contaminants can migrate into the river sediment and bioaccumulate in the fish/shellfish that inhibit the Back River. (Radian International, February 1996, SI Report, p. 8-23) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Toluene 0.62 ug/L Benzene 1.01 ug/L Selenium 6.25 ug/L Lead 7.0 ug/L Arsenic 39.3 ug/L

Soil: Low Risk

Subsurface soil contaminants can migrate to the groundwater and the Back River. (Note: All soil samples were subsurface.) (Radian International, February 1996, SI Report for 33 IRP Sites, p. 8-23) The site is an area of petroleum contamination beneath predominantly paved area. Direct human exposure to the subsurface soil can occur only if intrusive actions occur. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 8-25)

Contaminants: Benzene 0.000149 mg/kg Toluene 0.000742 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

Sample locations cannot confirm if contaminant migration is occurring. (IT Corporation, August 1997, Draft RI Report, Figure 4-23a) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Aldrin 0.01 ug/L BHC 0.01 ug/L Lead 10.4 ug/L Manganese and compounds 982.0 ug/L Iron 1450.0 ug/L

Soil: Low Risk

All sample locations are within site boundaries; therefore, contaminant migration, if any, cannot be determined using available data. (IT Corporation, August 1997, Draft RI Report, Figure 4-22a) The adult fisher/hunter and child trespasser may be potentially exposed to soil contamination by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-5)

Contaminants: Arsenic 0.0015 mg/kg Iron 3.5300000000000002 mg/kg

Surface Water: High Risk

Surface water data indicate that migration may be occurring but are not conclusive. (Radian International, August 1997, 7-Site RI Report, p. 8-21) Exposure to contaminated surface water may occur during outdoor activities of the groundskeeper or child trespasser. (Radian International, August 1997, 7-Site RI Report, p. 8-21)

Contaminants: Dieldrin 0.03 ug/L Heptachlor Epoxide 0.13 ug/L Arsenic 58.4 ug/L Lead 326.0 ug/L Manganese and compounds 1110.0 ug/L Aluminum 63100.0 ug/L Iron 120000.0 ug/L

Sediment (Fresh): High Risk

Sediment data indicate that migration may be occurring but are not conclusive. (Radian International, August 1997, 7-Site RI Report, p. 8-11) Exposures are complete for the terrestrial and aquatic species. Aquatic invertebrates inhabit the drainage channel and Back River shoreline. (Radian International, August 1997, RI Report, p. 8-39)

Contaminants: Heptachlor Epoxide 0.000229 mg/kg Dieldrin 0.000366 mg/kg Arsenic 0.0205 mg/kg Manganese and compounds 0.234 mg/kg Aluminum 24.3 mg/kg Iron 39.1 mg/kg

Surface Water (Fresh): High Risk

Surface water data indicate that migration may be occurring but are not conclusive. (Radian International, August 1997, 7-Site RI Report, p. 8-21) Exposures is complete for the terrestrial and aquatic species. Aquatic invertebrates inhabit the drainage channel and Back River shoreline. Wading birds and waterfowl forage along the drainage channel. (Radian, August 1997, RI Report, p. 8-39)

Contaminants: Dieldrin 0.03 ug/L Heptachlor Epoxide 0.13 ug/L Arsenic 58.4 ug/L Lead 326.0 ug/L Manganese and compounds 1110.0 ug/L Aluminum 63100.0 ug/L Iron 120000.0 ug/L

Groundwater: Medium Risk

Available data do not conclusively indicate whether migration of chemicals is occurring via groundwater. (Radian International, August 1997, 7-Site RI Report, p. 8-7) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.02 ug/L BHC 0.03 ug/L 1,2-Dichloropropane 0.22 ug/L Vinyl Chloride 0.24 ug/L 1,1-Dichloroethane 0.25 ug/L Benzene 5.83 ug/L Arsenic 122.0 ug/L Barium 267.0 ug/L Manganese and compounds 6450.0 ug/L Iron 23200.0 ug/L Calcium-41 488000.0 pCi/L Sodium-22 4420000.0 pCi/L

Sediment (Human): Medium Risk

Sediment data indicate that migration may be occurring but are not conclusive. (Radian International, August 1997, 7-Site RI Report, p. 8-11) Exposure to contaminated sediment may occur during outdoor activities of the groundskeeper and child trespasser. (Radian International, August 1997, 7-Site RI Report, p. 8-21)

Contaminants: Heptachlor Epoxide 0.000229 mg/kg Dieldrin 0.000366 mg/kg Arsenic 0.0205 mg/kg Manganese and compounds 0.234 mg/kg Aluminum 24.3 mg/kg Iron 39.1 mg/kg

Soil: Medium Risk

There is no evidence that show the soil contamination is migrating beyond site boundaries. (Radian International, August 1997, 7-Site RI Report, p. 8-13) Exposure to contaminated sediment may occur during lawn care activities and outdoor activities of the groundskeeper and child trespasser. (Radian International, August 1997, 7-Site RI Report, p. 8-21)

Contaminants: Dieldrin 0.0010400000000000001 mg/kg Indeno(1,2,3-cd)Pyrene 0.00138 mg/kg Benzo(a)Pyrene 0.00302 mg/kg Benzo(b)Fluoranthene 0.0038900000000000002 mg/kg Arsenic 0.039200000000000006 mg/kg Vanadium 0.073 mg/kg Manganese and compounds 1.35 mg/kg Aluminum 11.8 mg/kg Lead 36.4 mg/kg

Soil: Low Risk

No pathway exposure per SI Report, 9/14/2007 No receptors per SI report, 9/14/07

Contaminants: Dieldrin 9.1e-07 mg/kg Arsenic 4.139999999999999e-06 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

Groundwater may migrate to Tide Mill Creek and Back River. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, and Sed), p. 3-3). Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor 0.01 ug/L Aldrin 0.05 ug/L Heptachlor Epoxide 0.08 ug/L Cadmium and compounds 0.18 ug/L Chloroform 0.24 ug/L Benzene 0.61 ug/L Antimony and compounds 1.39 ug/L Vinyl Chloride 2.14 ug/L 1,4-Dichlorobenzene 6.97 ug/L Pentachlorophenol 7.57 ug/L Dieldrin 7.93 ug/L Chlorobenzene 24.0 ug/L Arsenic 27.8 ug/L Manganese and compounds 2400.0 ug/L

Sediment (Fresh): Low Risk

Sediment can potentially migrate to the aquatic/wetland plants and into both Tide Mill Creek and Back River. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 4-23) Aquatic receptors have a potentially complete exposure pathway. Ingestion of sediment by aquatic organisms was the only pathway quantified. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 4-23)

Contaminants: Dieldrin 2.68e-06 mg/kg N-Nitrosodi-n-propylamine 0.000517 mg/kg PCBs 0.0005520000000000001 mg/kg Dibenz[ah]anthracene 0.00067 mg/kg Hexachlorobenzene 0.000696 mg/kg Toxaphene 0.0016200000000000001 mg/kg Lead 0.0325 mg/kg Manganese and compounds 0.228 mg/kg Iron 26.2 mg/kg Aluminum 27.5 mg/kg

Sediment (Human): Low Risk

Sediment can potentially migrate to the aquatic/wetland plants and into both Tide Mill Creek and Back River. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 4-23) The potential for sediment contamination to expose human receptors is unlikely to occur according to Base personnel. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 3-2)

Contaminants: Dieldrin 2.68e-06 mg/kg N-Nitrosodi-n-propylamine 0.000517 mg/kg PCBs 0.0005520000000000001 mg/kg Dibenz[ah]anthracene 0.00067 mg/kg Hexachlorobenzene 0.000696 mg/kg Toxaphene 0.0016200000000000001 mg/kg Lead 0.0325 mg/kg Manganese and compounds 0.228 mg/kg Iron 26.2 mg/kg Aluminum 27.5 mg/kg

Soil: Low Risk

Contamination may migrate from the surface soil to surface water, groundwater, and sediment. (Radian International, May 1997, Baseline Human Health Risk Assessment (Soil), p. 3-3) Potential receptors include: adult/child in future billeting area, child at future playground, future daycare center and future ballfield. (Radian International, May 1997, Baseline Human Health Risk Assessment (Soil), p. 3-27, 3-35)

Contaminants: Heptachlor Epoxide 0.00015 mg/kg Aldrin 0.000451 mg/kg Dibenz[ah]anthracene 0.00332 mg/kg Indeno(1,2,3-cd)Pyrene 0.00745 mg/kg Benzo(a)Pyrene 0.02 mg/kg Benzo(b)Fluoranthene 0.023100000000000002 mg/kg Benzo(k)Fluoranthene 0.023100000000000002 mg/kg Dieldrin 0.0234 mg/kg Arsenic 0.0358 mg/kg Lead 0.201 mg/kg

Surface Water: Low Risk

Surface water has the potential to migrate to the Tide Mill Creek and the Back River. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 4-23) The adult fisherman/fish consumer could be exposed to surface water. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (Groundwater, Surface Water, and Sediment) for Site OT-06, p. 3-7)

Contaminants: Dieldrin 7.93 ug/L Nickel-56 160.0 pCi/L Lead 471.0 ug/L Manganese and compounds 3680.0 ug/L Aluminum 161000.0 ug/L Iron 274000.0 ug/L

Surface Water (Fresh): Low Risk

Surface water has the potential to migrate to the Tide Mill Creek and the Back River. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 4-23) Exposure is a potentially complete pathway for aquatic receptors. The ingestion of SW by aquatic organisms was the only pathway quantified. (Radian International, August 1997, Baseline Human Health and Ecological Risk Assessment (GW, SW, Sed), p. 4-23)

Contaminants: Dieldrin 7.93 ug/L Nickel-56 160.0 pCi/L Lead 471.0 ug/L Manganese and compounds 3680.0 ug/L Aluminum 161000.0 ug/L Iron 274000.0 ug/L

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Soil: Medium Risk

The occurrence and extent of soil contaminant migration could not be determined due to the number and location of soil samples. (Note: Data are for surface soil samples.) (Radian International, December 1997, MAP, p. K/L-152) People can potentially contact the surface soil. Direct human exposure to subsurface soils can occur if intrusive actions bring the subsurface soil to the surface. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 29-152)

Contaminants: PCB 7.02e-05 mg/kg Dieldrin 0.000128 mg/kg Beryllium and compounds 0.0010600000000000002 mg/kg Indeno(1,2,3-cd)Pyrene 0.00108 mg/kg Cadmium and compounds 0.00135 mg/kg Silver and compounds 0.00222 mg/kg Benzo(b)Fluoranthene 0.00304 mg/kg Benzo(a)Pyrene 0.0030499999999999998 mg/kg Arsenic 0.0096 mg/kg Vanadium 0.06 mg/kg Lead 0.8250000000000001 mg/kg Aluminum 12.6 mg/kg Iron 21.0 mg/kg

Groundwater: Low Risk

Contaminants from the surface burning have a potentially complete pathway to infiltrate to the groundwater. (Radian International, August 1997, RI Report, p. 11-18) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor Epoxide 0.02 ug/L BHC 0.02 ug/L Acenaphthene 0.32 ug/L Cadmium and compounds 0.95 ug/L 1,4-Dichlorobenzene 2.81 ug/L Lead 9.0 ug/L Arsenic 9.45 ug/L Chromium 15.9 ug/L Manganese and compounds 144.0 ug/L Barium 200.0 ug/L Iron 4330.0 ug/L

Soil: Low Risk

Contaminants in subsurface soils may infiltrate or percolate to groundwater. No groundwater data is available, but it may be contaminated due to its shallow depth. (Radian International, February 1996, SI for 33 IRP Sites, p. 30-26) Direct human exposure (through incidental ingestion of, and dermal contact with the soil) can occur only if intrusive actions bring the subsurface soils to the surface. (Radian International, February 1996, SI for 33 IRP Sites, p. 30-23)

Contaminants: Cadmium and compounds 0.0006590000000000001 mg/kg Lead 0.106 mg/kg Barium 0.157 mg/kg

Sediment (Fresh): Medium Risk

The extent of migration for sediment cannot be determined because there was only one storm sewer that was sampled for sediment. (IT Corporation, July 1998, Storm Sewer Sediment Analytical Results for OT-51) Sediment is not considered a preferred habitat for ecological receptors. (Radian International, December 1997, MAP, p. E-OT-51 CSM)

Contaminants: Arsenic 0.0223 mg/kg Chromium 0.0419 mg/kg Vanadium 0.11900000000000001 mg/kg Manganese and compounds 0.489 mg/kg Aluminum 16.0 mg/kg Iron 40.1 mg/kg

Sediment (Human): Medium Risk

The extent of migration for sediment cannot be determined because there was only one storm sewer that was sampled for sediment. (IT Corporation, July 1998, Storm Sewer Sediment Analytical Results for OT-51) Exposure to sediment is not considered a likely pathway for human receptors to be exposed to contamination. (Radian International, December 1997, MAP, p. E-OT-51 CSM)

Contaminants: Arsenic 0.0223 mg/kg Chromium 0.0419 mg/kg Vanadium 0.11900000000000001 mg/kg Manganese and compounds 0.489 mg/kg Aluminum 16.0 mg/kg Iron 40.1 mg/kg

Soil: Medium Risk

From the existing data and sampling locations, migration of contamination from soil cannot be determined. (IT Corporation, July 1998, Surface Soil Analytical Results for OT-51) Commercial users can potentially be exposed by inhalation soil vapors and dermal contact. Future residents may be exposed to contamination via ingestion, inhalation, and dermal contact. (Radian International, December 1997, MAP, Appendix E, OT-51 CSM)

Contaminants: Dieldrin 0.00011 mg/kg Antimony and compounds 0.0050999999999999995 mg/kg Arsenic 0.0145 mg/kg Manganese and compounds 0.20500000000000002 mg/kg Vanadium 1.77 mg/kg Aluminum 14.0 mg/kg Iron 25.900000000000002 mg/kg

Groundwater: Low Risk

Migration of groundwater contamination cannot be determined using existing data. (IT Corporation, July 1998, Groundwater Analytical Results for OT-51) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.01 ug/L 1,1-Dichloroethylene 0.37 ug/L Vinyl Chloride 5.7 ug/L Arsenic 5.8 ug/L Trichloroethylene (TCE) 7.1 ug/L Vanadium 24.2 ug/L 1,2-Dichloroethylene (Total) 31.0 ug/L Nickel-56 94.0 pCi/L Manganese and compounds 710.0 ug/L

Soil: Medium Risk

The potential exists for contamination from fuel/application spills to migrate from soil to outdoor air, subsurface soil, groundwater, and Back River. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 37-33) Human receptors may be exposed by ingestion or dermal contact. Human receptors can be exposed if intrusive actions bring the subsurface soil to the surface. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 37-35)

Contaminants: Dieldrin 9.400000000000001e-05 mg/kg Beryllium and compounds 0.00064 mg/kg Indeno(1,2,3-cd)Pyrene 0.00558 mg/kg Arsenic 0.00583 mg/kg Benzo(a)Pyrene 0.009880000000000002 mg/kg Benzo(b)Fluoranthene 0.016399999999999998 mg/kg Benzo(k)Fluoranthene 0.016399999999999998 mg/kg Chromium 0.0695 mg/kg Manganese and compounds 0.217 mg/kg Aluminum 9.9 mg/kg Iron 18.5 mg/kg

Groundwater: Low Risk

Groundwater has the potential to migrate surface water. Outdoor air (future dwelling), sediment, and fish/shellfish can potentially be exposed. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 37-33) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Benzene 0.36 ug/L 1,2-Dichloroethane (EDC) 0.4 ug/L Antimony and compounds 9.6 ug/L Arsenic 9.67 ug/L Dibenzofuran 66.0 ug/L Carbazole 87.8 ug/L Manganese and compounds 427.0 ug/L Naphthalene 447.0 ug/L Iron 1140.0 ug/L

Sediment (Fresh): High Risk

Sediment does not have the potential to migrate to another media based on the CSM for OT-56. (Radian International, December 1997, MAP, Appendix E, CSM for OT-56) Sediment contamination has the potentially to affect fish/shellfish that bioaccumulate contaminants.

Contaminants: Methoxychlor 0.0023 mg/kg Aroclor 1254 0.003 mg/kg Benzo(k)Fluoranthene 0.035 mg/kg Benzo(a)Anthracene 0.041299999999999996 mg/kg Benzo(a)Pyrene 0.046 mg/kg Benzo(b)Fluoranthene 0.0548 mg/kg Carbazole 0.0608 mg/kg Pyrene 0.0986 mg/kg Fluoranthene 0.154 mg/kg Manganese and compounds 0.861 mg/kg Zinc 1.17 mg/kg Lead 5.8 mg/kg Aluminum 18.2 mg/kg Iron 27.400000000000002 mg/kg

Surface Water (Fresh): High Risk

Surface water contamination has the potential to migrate to the sediment in the surface water according to the CSM for OT-56. (Radian International, December 1997, MAP, Appendix E, CSM for OT-56) Aquatic receptors can potentially be exposed to contamination in the surface water by dermal contact and incidental ingestion.

Contaminants: Methyl Chloride 2.0 ug/L Mercury 2.4 ug/L Bis(2-Ethylhexyl)Phthalate 8.0 ug/L Acetone 11.0 ug/L Arsenic 22.1 ug/L Zinc 104.0 ug/L Manganese and compounds 368.0 ug/L Barium 601.0 ug/L Aluminum 6130.0 ug/L Iron 9040.0 ug/L Magnesium-28 524000.0 pCi/L

Sediment (Human): Medium Risk

Sediment does not have the potential to migrate to another media based on the CSM for OT-56. (Radian International, December 1997, MAP, Appendix E, CSM for OT-56) Recreational users or residential users potentially can directly contact the surface soil possibly resulting in incidental ingestion of and dermal contact with the soil. (Radian International, December 1997, MAP, Appendix E, CSM for OT-56)

Contaminants: Methoxychlor 0.0023 mg/kg Aroclor 1254 0.003 mg/kg Benzo(k)Fluoranthene 0.035 mg/kg Benzo(a)Anthracene 0.041299999999999996 mg/kg Benzo(a)Pyrene 0.046 mg/kg Benzo(b)Fluoranthene 0.0548 mg/kg Carbazole 0.0608 mg/kg Pyrene 0.0986 mg/kg Fluoranthene 0.154 mg/kg Manganese and compounds 0.861 mg/kg Zinc 1.17 mg/kg Lead 5.8 mg/kg Aluminum 18.2 mg/kg Iron 27.400000000000002 mg/kg

Surface Water: Medium Risk

Surface water contamination has the potential to migrate to the sediment in the surface water according to the CSM for OT-56. (Radian International, December 1997, MAP, Appendix E, CSM for OT-56) Maintenance workers can be exposed via inhalation. Recreational users (i.e., fisherman) and residential users can be exposed potentially via dermal contact. (Radian International, December 1997, MAP, Appendix E, CSM for OT-56).

Contaminants: Methyl Chloride 2.0 ug/L Mercury 2.4 ug/L Bis(2-Ethylhexyl)Phthalate 8.0 ug/L Acetone 11.0 ug/L Arsenic 22.1 ug/L Zinc 104.0 ug/L Manganese and compounds 368.0 ug/L Barium 601.0 ug/L Aluminum 6130.0 ug/L Iron 9040.0 ug/L Magnesium-28 524000.0 pCi/L

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

Groundwater has the potential to migrate into the indoor air and into the Back River. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 20-29) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Cadmium and compounds 0.95 ug/L Lead 3.5 ug/L Toluene 11.7 ug/L Chromium 14.4 ug/L Benzene 49.2 ug/L Barium 71.0 ug/L Arsenic 88.0 ug/L

Soil: Low Risk

The subsurface soil contamination has the potential to migrate into the groundwater and into the Back River. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 20-29) The site is an area of petroleum contamination beneath a paved area. (Note: All soil samples were subsurface.) (Radian International, February 1996, SI Report for 33 IRP Sites, p. 20-30)

Contaminants: Benzene 1.0e-08 mg/kg Toluene 2.4000000000000003e-07 mg/kg Cadmium and compounds 8.4e-07 mg/kg Lead 9.37e-05 mg/kg Arsenic 0.00012 mg/kg

Sediment (Fresh): High Risk

Sediment sample results indicate chemicals at concentrations above RBLs from samples collected in the Back River. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-12) Terrestrial species may incidentally ingest sediment while foraging for food. Aquatic life was observed foraging in the drainage channel and along the shoreline of the Back River. (Radian International, August 1997, RI Report, p. 7-39, 7-41)

Contaminants: 4,4-DDD 0.000259 mg/kg Dibenz[ah]anthracene 0.000433 mg/kg Indeno(1,2,3-cd)Pyrene 0.00157 mg/kg Benzo(a)Anthracene 0.00234 mg/kg Benzo(a)Pyrene 0.00313 mg/kg Pyrene 0.00542 mg/kg Benzo(b)Fluoranthene 0.00614 mg/kg Benzo(k)Fluoranthene 0.00614 mg/kg Lead 0.051000000000000004 mg/kg Arsenic 0.0522 mg/kg Manganese and compounds 0.256 mg/kg Aluminum 15.9 mg/kg Iron 59.1 mg/kg

Sediment (Human): High Risk

Sediment sample results indicate chemicals at concentrations above RBLs from samples collected in the Back River. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-12) Exposure to contaminated sediment may occur during lawn care activities and outdoor activities of the groundskeeper and child trespasser. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-24)

Contaminants: 4,4-DDD 0.000259 mg/kg Dibenz[ah]anthracene 0.000433 mg/kg Indeno(1,2,3-cd)Pyrene 0.00157 mg/kg Benzo(a)Anthracene 0.00234 mg/kg Benzo(a)Pyrene 0.00313 mg/kg Pyrene 0.00542 mg/kg Benzo(b)Fluoranthene 0.00614 mg/kg Benzo(k)Fluoranthene 0.00614 mg/kg Lead 0.051000000000000004 mg/kg Arsenic 0.0522 mg/kg Manganese and compounds 0.256 mg/kg Aluminum 15.9 mg/kg Iron 59.1 mg/kg

Groundwater: Medium Risk

Contamination from leachate of unknown materials deposited in the landfill migrating to groundwater is possible. (Radian International, December 1997, MAP, p. K/L-24) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.02 ug/L BHC 0.02 ug/L Heptachlor 0.02 ug/L Heptachlor Epoxide 0.04 ug/L 1,2-Dichloroethane (EDC) 0.3 ug/L Arsenic 5.73 ug/L Barium 336.0 ug/L Manganese and compounds 7260.0 ug/L Iron 98800.0 ug/L Magnesium-28 210000.0 pCi/L Calcium-41 606000.0 pCi/L Sodium-22 1570000.0 pCi/L

Surface Water: Medium Risk

The drainage channel is an NPDES outfall and may receive contaminants from areas outside the site. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-24) The groundskeeper and child trespasser may be exposed to contaminants. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-24)

Contaminants: Aldrin 0.01 ug/L Dieldrin 0.01 ug/L 4,4-DDD 0.01 ug/L Heptachlor Epoxide 0.02 ug/L Pyrene 0.51 ug/L Arsenic 4.82 ug/L Lead 6.91 ug/L Manganese and compounds 335.0 ug/L Aluminum 1390.0 ug/L Iron 2670.0 ug/L

Surface Water (Fresh): Medium Risk

The drainage channel is an NPDES outfall and may receive contaminants from areas outside the site. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-24) Exposure to contaminated sediment may occur during lawn care activities and outdoor activities of the groundskeeper and child trespasser. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-24)

Contaminants: Aldrin 0.01 ug/L Dieldrin 0.01 ug/L 4,4-DDD 0.01 ug/L Heptachlor Epoxide 0.02 ug/L Pyrene 0.51 ug/L Arsenic 4.82 ug/L Lead 6.91 ug/L Manganese and compounds 335.0 ug/L Aluminum 1390.0 ug/L Iron 2670.0 ug/L

Soil: Low Risk

No soil samples were collected beyond site boundaries. The extent of soil migration, if any, cannot be determined. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-14) The groundskeeper may be exposed to contaminants during lawn care activities. The child trespasser may be exposed to contaminants when using the site for outdoor activities. (Radian International, August 1997, RI Report for 7 IRP Sites, p. 7-24)

Contaminants: Benzo(a)Pyrene 0.000231 mg/kg Beryllium and compounds 0.0007970000000000001 mg/kg Arsenic 0.0128 mg/kg Vanadium 0.056 mg/kg Aluminum 14.700000000000001 mg/kg Iron 21.900000000000002 mg/kg

Sediment (Fresh): Medium Risk

The extent of sediment migration can not be determined using existing data. (IT Corporation, August 1997, Draft RI Report, Figure 4-5) Terrestrial organisms may be exposed by dermal contact, by incidental ingestion from foraging on aquatic organisms. Aquatic organisms may be exposed by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 7-8)

Contaminants: 4,4-DDT 3.3e-06 mg/kg 4,4-DDE 1.7000000000000003e-05 mg/kg Beryllium and compounds 0.0015 mg/kg Arsenic 0.0209 mg/kg Lead 0.0575 mg/kg Vanadium 0.07909999999999999 mg/kg Manganese and compounds 0.176 mg/kg Aluminum 23.6 mg/kg Iron 35.9 mg/kg

Sediment (Human): Medium Risk

The extent of sediment migration can not be determined using existing data. (IT Corporation, August 1997, Draft RI Report, Figure 4-5) Exposure to contaminated sediment may occur by direct contact and ingestion of fish that bioaccumulate the contaminants from sediment. (IT Corporation, August 1997, Draft RI Report, Figure 6-1)

Contaminants: 4,4-DDT 3.3e-06 mg/kg 4,4-DDE 1.7000000000000003e-05 mg/kg Beryllium and compounds 0.0015 mg/kg Arsenic 0.0209 mg/kg Lead 0.0575 mg/kg Vanadium 0.07909999999999999 mg/kg Manganese and compounds 0.176 mg/kg Aluminum 23.6 mg/kg Iron 35.9 mg/kg

Soil: Medium Risk

All soil samples were taken within the site boundaries; therefore, contaminant migration can not be determined using existing data. (IT Corporation, August 1997, Draft RI Report, Figure 4-1A) The groundskeeper, adult hunter/fisher, and child trespasser can be exposed to contamination by incidental ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-1)

Contaminants: Dioxin (2,3,7,8-TCDD) 8.2e-07 mg/kg Dieldrin 8.5e-05 mg/kg Dibenz[ah]anthracene 0.00021 mg/kg Benzo(a)Pyrene 0.00058 mg/kg Beryllium and compounds 0.00079 mg/kg Benzo(b)Fluoranthene 0.00093 mg/kg Arsenic 0.034100000000000005 mg/kg Aluminum 13.700000000000001 mg/kg Iron 27.0 mg/kg

Surface Water (Fresh): Medium Risk

There were no COCs above the background levels for surface water. The extent of contaminant migration via surface water can not be determined with existing data. (IT Corporation, August 1997, Draft RI Report, Table 4-7) Terrestrial organisms may be exposed by dermal contact, by incidental ingestion from foraging on aquatic organisms. Aquatic organisms may be exposed by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 7-8)

Contaminants: Lead 4.5 ug/L Chromium 11.5 ug/L Manganese and compounds 232.0 ug/L Aluminum 976.0 ug/L Iron 1250.0 ug/L

Groundwater: Low Risk

Using Figure 4-3A, the locations of 3 out of the 5 monitoring wells were on site. The groundwater contaminant migration can not be determined with available data. (IT Corporation, August 1997, Draft RI Report, Figure 4-3A) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor Epoxide 0.0 ug/L Dieldrin 0.0 ug/L Aldrin 0.01 ug/L Heptachlor 0.01 ug/L 1,4-Dichlorobenzene 2.0 ug/L Bis(2-Ethylhexyl)Phthalate 5.2 ug/L Arsenic 42.1 ug/L Antimony and compounds 63.0 ug/L Lead 75.5 ug/L Thallium-194 75.8 pCi/L Barium 754.0 ug/L Manganese and compounds 7550.0 ug/L Iron 77000.0 ug/L

Surface Water: Low Risk

There were no COCs above the background levels for surface water. The extent of contaminant migration via surface water can not be determined with existing data. (IT Corporation, August 1997, Draft RI Report, Table 4-7) The adult hunter/fisher and child trespasser may potentially be exposed to contamination in the surface water by dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-1)

Contaminants: Lead 4.5 ug/L Chromium 11.5 ug/L Manganese and compounds 232.0 ug/L Aluminum 976.0 ug/L Iron 1250.0 ug/L

Groundwater: Low Risk

Groundwater has the potential to migrate into the indoor air and the Back River/drainage ditch, sediment, outdoor air, and fish/shellfish. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 25-38) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Beryllium and compounds 1.63 ug/L Arsenic 2.1 ug/L Thallium-194 19.7 pCi/L Manganese and compounds 1100.0 ug/L

Soil: Low Risk

Contamination has the potential to infiltrate into the groundwater and by intrusive actions of humans migrate to the outdoor air. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 25-38) Direct human exposure (through incidental ingestion of, and dermal contact with the soil) can occur only if intrusive actions bring the subsurface soil to the surface. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 25-40)

Contaminants: Benzo(a)Pyrene 6.0400000000000004e-05 mg/kg Acetone 0.000303 mg/kg Bis(2-Ethylhexyl)Phthalate 0.000635 mg/kg Cadmium and compounds 0.000724 mg/kg Silver and compounds 0.0012 mg/kg Methylene Chloride 0.0114 mg/kg

Groundwater: Low Risk

Groundwater has the potential to migrate into the indoor air and into Tabbs Creek. Groundwater can potentially discharge to the Back River. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 26-43 and 26-45) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Lead 17.9 ug/L Zinc 35.9 ug/L Arsenic 55.0 ug/L Barium 56.1 ug/L Manganese and compounds 4220.0 ug/L Aluminum 5730.0 ug/L Iron 34400.0 ug/L

Soil: Low Risk

The contaminants can infiltrate through the subsurface soil to the groundwater and runoff in storm water into Tabbs Creek that drains into the Back River. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 26-43) The site is fenced and paved, it is unlikely that people will directly contact the soil. Pesticides, herbicides, and metals were detected in surface soil samples taken from surrounding area. (Radian International, February 1996, SI Report, p. 26-45)

Contaminants: Dichloropropane 2.94e-05 mg/kg 4,4-DDE 4.48e-05 mg/kg Dieldrin 7.22e-05 mg/kg 4,4-DDT 0.000218 mg/kg Cadmium and compounds 0.00285 mg/kg Lead 0.093 mg/kg Zinc 0.419 mg/kg

Groundwater: Low Risk

Chemicals in groundwater have the potential to migrate into indoor air and surface water, sediment, outdoor air, and fish/shellfish. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 36-36) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Arsenic 0.03 ug/L Manganese and compounds 0.77 ug/L Benzene 761.0 ug/L Ethyl benzene 1410.0 ug/L

Soil: Low Risk

Surface soil contamination has the potential to migrate to the outdoor air, surface waters, sediment, outdoor air, and fish/shellfish. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 36-36) People potentially can have direct contact with the surface soil through incidental ingestion and dermal contact. The site is covered with asphalt and grass. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 36-35)

Contaminants: Aldrin 2.6300000000000002e-05 mg/kg Heptachlor Epoxide 3.39e-05 mg/kg Dieldrin 4.0e-05 mg/kg Cadmium and compounds 0.000885 mg/kg Chromium 0.0767 mg/kg

Soil: Medium Risk

Contaminants: Benzene 0.1 mg/kg

Sediment (Fresh): Low Risk

Contaminants: Lead 0.42 mg/kg

Sediment (Human): Low Risk

Contaminants: Arsenic 0.0522 mg/kg Manganese and compounds 0.256 mg/kg Lead 0.42 mg/kg Barium 1.01 mg/kg Aluminum 40.800000000000004 mg/kg

Sediment (Marine): Low Risk

Contaminants: Arsenic 0.0522 mg/kg Manganese and compounds 0.256 mg/kg Barium 1.01 mg/kg Aluminum 40.800000000000004 mg/kg

Surface Water: Low Risk

Contaminants: Chromium 573000.0 ug/L

Surface Water (Marine): Low Risk

Contaminants: Chromium 573000.0 ug/L

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: High Risk

Dermal contact with the gw. Base personnel, construction workers, trespassers, and residents using surface water and ingesting benthic organisms.

Contaminants: Benzene 500.0 ug/L

Soil: Low Risk

Contaminants: Benzene 0.0005 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

The monitoring wells are located within the site; therefore, migration of groundwater contamination cannot be determined using existing data. (Radian International, October 1995, Draft Sampling and Analysis Results for Site St-31, p. 4-2) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Benzene 1.22 ug/L Chlorobenzene 7.98 ug/L

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Medium Risk

There is evidence that the free product has moved along the fuel line. There is no contaminant hazard factor for free product. When there is free product funds are not spend to analyze the groundwater we just remove the free product. There are potential receptors. The gw is a potential drinking water source and has beneficial uses.

Contaminants: Benzene 1.0 ug/L

Soil: Low Risk

There are identified receptors but not frequent construction in the area.

Contaminants: Benzene 1.0e-06 mg/kg

Groundwater: Low Risk

Due to the location of the wells, migration cannot be determined using existing data. (Law Environmental, Inc., June 1991, Decision Document for IRP Site ST-34, p. 3) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Toluene 0.0 ug/L Benzene 0.0 ug/L

Sediment (Fresh): Medium Risk

Due to the location of sampling locations, sediment migration cannot be determined using existing data. (IT Corporation, April 1998, Sampling Locations for Site ST-48) Terrestrial and aquatic organisms may be potentially exposed to sediment contamination by ingestion; dermal contact with contaminated sediments.

Contaminants: Dieldrin 1.4e-05 mg/kg Benzo(a)Anthracene 9.2e-05 mg/kg Chrysene 0.00021 mg/kg Pyrene 0.00027 mg/kg Arsenic 0.015300000000000001 mg/kg Manganese and compounds 0.191 mg/kg Aluminum 14.6 mg/kg Iron 28.0 mg/kg

Sediment (Human): Medium Risk

Due to the location of sampling locations, sediment migration cannot be determined using existing data. (IT Corporation, April 1998, Sampling Locations for Site ST-48) Human receptors that may potentially be exposed to sediment contamination include commercial workers.

Contaminants: Dieldrin 1.4e-05 mg/kg Benzo(a)Anthracene 9.2e-05 mg/kg Chrysene 0.00021 mg/kg Pyrene 0.00027 mg/kg Arsenic 0.015300000000000001 mg/kg Manganese and compounds 0.191 mg/kg Aluminum 14.6 mg/kg Iron 28.0 mg/kg

Groundwater: Low Risk

Groundwater migration cannot be determined using existing data. All the groundwater-monitoring wells are located within the site. (IT Corporation, April 1998, Sampling Locations for Site ST-48) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor 0.05 ug/L Bis(2-Ethylhexyl)Phthalate 16.0 ug/L Arsenic 27.1 ug/L Vanadium 34.6 ug/L Benzene 420.0 ug/L Manganese and compounds 4590.0 ug/L Iron 53000.0 ug/L

Soil: Low Risk

All soil samples were taken within the site; therefore, migration of contamination in soil cannot be determined using existing data. (IT Corporation, April 1998, Sampling Locations for Site ST-48) Commercial users and recreational users can potentially be exposed by inhalation soil vapors; dermal contact with soil; and ingestion of soil. (Radian International, December 1997, MAP, Appendix E, ST-48 CSM)

Contaminants: Dieldrin 4.3e-06 mg/kg Bis(2-Ethylhexyl)Phthalate 0.00028000000000000003 mg/kg Arsenic 0.0043 mg/kg Lead 0.06490000000000001 mg/kg Iron 11.4 mg/kg

Groundwater: Low Risk

Chemicals in groundwater have the potential to migrate into the indoor air and surface water, sediment, outdoor air, and fish/shellfish. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 33-25) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Acenaphthene 0.66 ug/L

Soil: Low Risk

Contamination in the subsurface soil has the potential to infiltrate into the groundwater and migrate to the outdoor air by intrusive actions of humans. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 33-25) Direct human exposure (through incidental ingestion of, and dermal contact with the soil) can occur only if intrusive actions bring the subsurface soil to the surface. (Radian International, February 1996, SI Report for 33 IRP Sites, p. 33-27)

Contaminants: Benzo(a)Pyrene 0.000128 mg/kg

Groundwater: Low Risk

Using the Conceptual Site Model (CSM), groundwater has the potential to migrate into surface water. Once contaminants migrate to the surface water, sediment can potentially be exposed. (Radian International, December 1997, MAP, Appendix E, ST-50 CSM) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Chloroethane 5.75 ug/L

Soil: Low Risk

Using the CSM, soil contamination has the potential to migrate to groundwater, air, and surface water. (Radian International, December 1997, MAP, Appendix E, ST-50 CSM) The potential receptors that may be contaminated include commercial users and future residents. (Radian International, December 1997, MAP, Appendix E, ST-50 CSM)

Contaminants: Heptachlor Epoxide 7.76e-06 mg/kg BHC 4.28e-05 mg/kg Arsenic 0.000103 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Sediment (Fresh): Medium Risk

Sample locations are all within site boundaries. The extent of migration, if any, cannot be determined using existing data. (IT Corporation, August 1997, Draft RI Report, Figure 4-10) Terrestrial organisms and aquatic organisms have the potential to ingest by foraging. Aquatic organisms can come into contact with contamination. (IT Corporation, August 1997, Draft RI Report, Figure 7-6)

Contaminants: 4,4-DDE 5.4e-05 mg/kg 4,4-DDD 6.900000000000001e-05 mg/kg Chlordane 8.1e-05 mg/kg Aroclor 0.00017 mg/kg Aroclor 1254 0.00035 mg/kg Anthracene 0.0026000000000000003 mg/kg Arsenic 0.061 mg/kg Manganese and compounds 0.306 mg/kg Chromium 0.5730000000000001 mg/kg Iron 79.4 mg/kg

Sediment (Human): Medium Risk

Sample locations are all within site boundaries. The extent of migration, if any, cannot be determined using existing data. (IT Corporation, August 1997, Draft RI Report, Figure 4-10) The adult hunter/fisher and a trespassing child have the potential to ingest or come into contact with contaminated sediment. (IT Corporation, August 1997, Draft RI Report, Figure 6-2)

Contaminants: 4,4-DDE 5.4e-05 mg/kg 4,4-DDD 6.900000000000001e-05 mg/kg Chlordane 8.1e-05 mg/kg Aroclor 0.00017 mg/kg Aroclor 1254 0.00035 mg/kg Anthracene 0.0026000000000000003 mg/kg Arsenic 0.061 mg/kg Manganese and compounds 0.306 mg/kg Chromium 0.5730000000000001 mg/kg Iron 79.4 mg/kg

Soil: Medium Risk

All sampling locations are within the site boundaries; therefore, contaminant migration, if any, cannot be determined using available data. ( IT Corporation, August 1997, Draft RI Report, Figure 4-6a) The groundskeeper, adult hunter/fisher, and child trespasser are the most sensitive receptors to soil contamination by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-2)

Contaminants: Arsenic 0.0193 mg/kg Manganese and compounds 0.446 mg/kg Aluminum 7.91 mg/kg Iron 44.4 mg/kg

Groundwater: Low Risk

Four out of 13 sample locations were off-site but close to site boundaries, contaminant migration, if any, cannot be determined using the available data. (IT Corporation, August 1997, Draft RI Report, Figure 4-8a) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor 0.0 ug/L Aldrin 0.01 ug/L Dieldrin 0.01 ug/L 1,4-Dichlorobenzene 5.5 ug/L Chlorobenzene 23.0 ug/L Vanadium 33.7 ug/L Vinyl Chloride 42.0 ug/L Antimony and compounds 61.1 ug/L Lead 77.3 ug/L Arsenic 92.9 ug/L Acetone 830.0 ug/L Barium 847.0 ug/L Manganese and compounds 3830.0 ug/L Iron 223000.0 ug/L

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

No monitoring wells are present downgradient of the site; migration from the site cannot be evaluated from existing data. (Radian International, June1998, RI Report, p. 5-8) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor Epoxide 0.01 ug/L Beryllium and compounds 0.25 ug/L Cadmium and compounds 14.1 ug/L Thallium-194 14.4 pCi/L Arsenic 18.0 ug/L Nickel-56 85.2 pCi/L Barium 262.0 ug/L Manganese and compounds 863.0 ug/L Zinc 1750.0 ug/L Iron 22100.0 ug/L

Soil: Low Risk

Soil samples were taken at four locations within the site. Migration potential cannot be determined with existing data. (Radian International, June 1998, RI Report for Sites WP-08 and WP-14, p. 5-29) The site surface soil is clean fill and gravel. It is mostly paved with concrete. The exposure pathways for human receptors are not complete. (Radian International, June 1998, RI Report for Sites WP-08 and WP-14, p. 5-1, 5-13)

Contaminants: Dieldrin 7.03e-05 mg/kg

Groundwater: Low Risk

All monitoring wells are located within the site boundaries; therefore, contaminant migration cannot be determined using existing data. (Radian International, June 1998, RI Report for Sites WP-08 and WP-14, p. 6-11) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Beryllium and compounds 0.65 ug/L Bis(2-Ethylhexyl)Phthalate 5.45 ug/L Dieldrin 7.57 ug/L Arsenic 9.7 ug/L Manganese and compounds 324.0 ug/L Iron 1890.0 ug/L

Soil: Low Risk

All soil samples were taken within site boundaries; therefore, contaminant migration cannot be determined using existing data. (Radian International, June 1998, RI Report for Sites WP-08 and WP-14, p. 6-13) The groundskeeper, utility worker, and child trespasser may be exposed to contamination. (Radian International, June 1998, RI Report for Sites WP-08 and WP-14, p. 6-24)

Contaminants: Dieldrin 6.75e-05 mg/kg Arsenic 0.0317 mg/kg Manganese and compounds 0.37 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Low Risk

Groundwater portions of FT-41 are included under site OT-64. OT-64

Contaminants: Dieldrin 0.02 ug/L Heptachlor 0.03 ug/L Heptachlor Epoxide 0.06 ug/L Vinyl Chloride 0.28 ug/L Chloroform 0.52 ug/L Benzene 0.52 ug/L 1,2-Dichloroethane (EDC) 2.55 ug/L Arsenic 3.32 ug/L Bis(2-Ethylhexyl)Phthalate 4.8 ug/L Lead 20.0 ug/L Manganese and compounds 324.0 ug/L Iron 8570.0 ug/L

Sediment (Fresh): Low Risk

Sediment is not likely to migrate to other media. The extent of sediment migration, if any, cannot be determined using existing data. (Radian International, August 1997, RI Report, p. 12-12, 12-23) Exposure is potentially complete exposure pathways for both terrestrial and aquatic receptors. Terrestrial species may ingest sediment while foraging for aquatic organisms. (Radian International, August 1997, RI Report, p. 12-43)

Contaminants: Benzo(a)Anthracene 0.00535 mg/kg Benzo(a)Pyrene 0.00708 mg/kg Dieldrin 0.0121 mg/kg Benzo(k)Fluoranthene 0.0143 mg/kg Arsenic 0.0337 mg/kg Vanadium 0.108 mg/kg Manganese and compounds 0.20800000000000002 mg/kg Iron 37.2 mg/kg Aluminum 40.800000000000004 mg/kg

Sediment (Human): Low Risk

Sediment is not likely to migrate to other media. The extent of sediment migration, if any, cannot be determined using existing data. (Radian International, August 1997, RI Report, p. 12-12, 12-23) The child trespasser may be exposed to sediment from the marsh because the site may be a desirable place for children to play. (Radian International, August 1997, RI Report, p. 12-24)

Contaminants: Benzo(a)Anthracene 0.00535 mg/kg Benzo(a)Pyrene 0.00708 mg/kg Dieldrin 0.0121 mg/kg Benzo(k)Fluoranthene 0.0143 mg/kg Arsenic 0.0337 mg/kg Vanadium 0.108 mg/kg Manganese and compounds 0.20800000000000002 mg/kg Iron 37.2 mg/kg Aluminum 40.800000000000004 mg/kg

Soil: Low Risk

Surface soil has the potential to migrate into surface water runoff that flows into the Back River, marshland, and Tabbs Creek. Soil can also emit fugitive dust and volatize into the outdoor air. (Radian International, August 1997, RI Report, p. 12-23) The fire crew/groundskeeper, child trespasser, and the construction workers may be exposed to contaminants at the site. (Radian International, August 1997, RI Report, p. 12-24 to 12-25)

Contaminants: Benzo(a)Pyrene 0.00040600000000000006 mg/kg Beryllium and compounds 0.00109 mg/kg Arsenic 0.0405 mg/kg Vanadium 0.056799999999999996 mg/kg Manganese and compounds 0.507 mg/kg Aluminum 9.21 mg/kg Iron 36.1 mg/kg

Surface Water: Low Risk

Surface water can migrate to the Back River, Marshland, and Tabbs Creek. It can also percolate through the subsurface soil to the groundwater. (Radian International, August 1997, RI Report, p. 12-23) The child trespasser may be exposed to surface water contaminants since the site may be a desirable place to play. (Radian International, August 1997, RI Report, p. 12-24

Contaminants: Dieldrin 0.83 ug/L Mercury 1.22 ug/L Benzo(a)Pyrene 2.32 ug/L Benzo(k)Fluoranthene 5.41 ug/L Arsenic 162.0 ug/L Lead 1170.0 ug/L Manganese and compounds 1320.0 ug/L Aluminum 70700.0 ug/L Iron 204000.0 ug/L

Surface Water (Fresh): Low Risk

Surface water can migrate to the Back River, Marshland, and Tabbs Creek. It can also percolate through the subsurface soil to the groundwater. (Radian International, August 1997, RI Report, p. 12-23) Exposure is a potentially complete pathway for both terrestrial and aquatic receptors. Terrestrial species may ingest surface water while foraging for aquatic organisms. (Radian International, August 1997, RI Report, p. 12-43)

Contaminants: Dieldrin 0.83 ug/L Mercury 1.22 ug/L Benzo(a)Pyrene 2.32 ug/L Benzo(k)Fluoranthene 5.41 ug/L Arsenic 162.0 ug/L Lead 1170.0 ug/L Manganese and compounds 1320.0 ug/L Aluminum 70700.0 ug/L Iron 204000.0 ug/L

Groundwater: Medium Risk

Contamination from leachate from unknown materials deposited in the landfill is possible. Dissolved groundwater data used. (Radian International, December 1997, Management Action Plan, p. K/L-6) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Heptachlor Epoxide 0.01 ug/L BHC 0.02 ug/L Aldrin 0.08 ug/L Arsenic 7.61 ug/L Thallium-194 15.2 pCi/L Manganese and compounds 1100.0 ug/L Iron 10400.0 ug/L Magnesium-28 645000.0 pCi/L Calcium-41 672000.0 pCi/L Sodium-22 4510000.0 pCi/L

Soil: Medium Risk

Migration could not be determined because all samples were collected within site boundaries. (Radian International, August 1997, 7-Site RI Report, p. 6-4, 6-10) Groundskeeper may be exposed to contamination during lawn care activities. (Radian International, August 1997, 7-Site RI Report, p. 6-16)

Contaminants: Benzo(a)Pyrene 0.000115 mg/kg Dieldrin 0.000966 mg/kg Beryllium and compounds 0.0011 mg/kg Arsenic 0.0302 mg/kg Chromium 0.057600000000000005 mg/kg Vanadium 0.0694 mg/kg Aluminum 18.7 mg/kg Iron 41.2 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Groundwater: Medium Risk

Dermal contact with the contaminated groundwater by base personnel Construction workers

Contaminants: Benzene 500.0 ug/L

Soil: Low Risk

Construction workers repairing utilities in the area

Contaminants: Benzene 0.0005 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Soil: Risk Not Evaluated

Contaminants: Naphthalene 0.296 mg/kg

Groundwater: Medium Risk

Migration of groundwater contamination cannot be determined using existing data. All monitoring wells are located on site. (PMC, July 1998, Final RI/FS Report for IRP Site SS-61, Figure 3-1) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.02 ug/L PCB 0.47 ug/L Chloroform 2.0 ug/L Carbazole 4.0 ug/L Thallium-194 14.9 pCi/L Chloromethane 54.0 ug/L Arsenic 252.0 ug/L Benzene 2400.0 ug/L Manganese and compounds 2620.0 ug/L Iron 14200.0 ug/L

Soil: Medium Risk

From the existing data and sampling locations, migration of contamination from soil cannot be determined. (PMC, July 1998, Final RI/FS Report for IRP Site SS-61, Figure 3-1) Commercial users can potentially be exposed by inhalation of vapors and dermal contact. Future residents may be exposed via ingestion, inhalation, and dermal contact. (Radian International, December 1997, MAP, Appendix E, SS-61 CSM)

Contaminants: PCB 0.0012 mg/kg Benzo(a)Pyrene 0.0044 mg/kg Arsenic 0.039 mg/kg

Sediment (Human): Risk Not Evaluated

Contaminants: Arsenic 0.0134 mg/kg Copper and compounds 0.289 mg/kg Lead 1.3 mg/kg

Soil: Risk Not Evaluated

Contaminants: Copper and compounds 0.0697 mg/kg Lead 14.086 mg/kg

Sediment (Marine): Risk Not Evaluated

Contaminants: Arsenic 0.0134 mg/kg Copper and compounds 0.289 mg/kg Lead 1.3 mg/kg

Surface Water: Risk Not Evaluated

Contaminants: Lead 225.0 ug/L

Surface Water (Marine): Risk Not Evaluated

Contaminants: Lead 225.0 ug/L

Sediment (Fresh): Medium Risk

Sample locations infer that contamination may be migrating off-site. However, more investigation would be required to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report, Figure 4-21) Aquatic organisms may be exposed to contamination by ingestion and dermal contact. Terrestrial organisms may be exposed to contamination by ingestion. (IT Corporation, August 1997, Draft RI Report, Figure 7-6)

Contaminants: 4,4-DDD 4.0e-05 mg/kg 4,4-DDE 4.7000000000000004e-05 mg/kg Chlordane 0.00023 mg/kg Aroclor 1254 0.00037 mg/kg Pyrene 0.00041 mg/kg Butyl Benzyl Phthalate 0.00096 mg/kg Arsenic 0.0285 mg/kg Aluminum 0.0598 mg/kg Lead 0.0917 mg/kg Vanadium 0.148 mg/kg Barium 0.234 mg/kg Zinc 0.40700000000000003 mg/kg Chromium 0.40800000000000003 mg/kg Manganese and compounds 1.8800000000000001 mg/kg Iron 58.7 mg/kg

Sediment (Human): Medium Risk

Sample locations infer that contamination may be migrating off-site. However, more investigation would be required to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report, Figure 4-21) The adult hunter/fisher and child trespasser may be exposed to sediment contamination by ingestion or dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-4)

Contaminants: 4,4-DDD 4.0e-05 mg/kg 4,4-DDE 4.7000000000000004e-05 mg/kg Chlordane 0.00023 mg/kg Aroclor 1254 0.00037 mg/kg Pyrene 0.00041 mg/kg Butyl Benzyl Phthalate 0.00096 mg/kg Arsenic 0.0285 mg/kg Aluminum 0.0598 mg/kg Lead 0.0917 mg/kg Vanadium 0.148 mg/kg Barium 0.234 mg/kg Zinc 0.40700000000000003 mg/kg Chromium 0.40800000000000003 mg/kg Manganese and compounds 1.8800000000000001 mg/kg Iron 58.7 mg/kg

Soil: Medium Risk

Most of the soil samples were taken within the site boundaries. Two samples were taken southwest of the site. Migration cannot be determined with the available data. (IT Corporation, August 1997, Draft RI Report, Figure 4-16a) The groundskeeper, construction worker, adult hunter/fisher, and child trespasser may be exposed to contamination in the soil by ingestion and dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 6-4)

Contaminants: Beryllium and compounds 0.00096 mg/kg Indeno(1,2,3-cd)Pyrene 0.0013000000000000002 mg/kg Benzo(a)Pyrene 0.0023 mg/kg Benzo(b)Fluoranthene 0.0032 mg/kg Arsenic 0.0307 mg/kg Vanadium 0.06709999999999999 mg/kg Manganese and compounds 0.531 mg/kg Aluminum 9.59 mg/kg Iron 49.7 mg/kg

Surface Water: Medium Risk

Sample locations infer that contamination may be migrating off-site. However, more investigation would be required to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report for LF-07, LF-10, LF-11, LF-12, and LF-13, Figure 4-20) The adult hunter/fisher and child trespasser may be exposed to surface water contamination. (IT Corporation, August 1997, Draft RI Report for LF-07, LF-10, LF-11, LF-12, and LF-13, Figure 6-4)

Contaminants: Lead 11.4 ug/L Arsenic 16.2 ug/L Chromium 46.8 ug/L Aluminum 1510.0 ug/L Manganese and compounds 2250.0 ug/L Iron 7120.0 ug/L

Surface Water (Fresh): Medium Risk

Sample locations infer that contamination may be migrating off-site. However, more investigation would be required to confirm contaminant migration. (IT Corporation, August 1997, Draft RI Report for LF-07, LF-10, LF-11, LF-12, and LF-13, Figure 4-20) Terrestrial organisms and aquatic organisms can potentially be exposed to contamination by ingestion. Aquatic organisms can also be exposed to contamination by dermal contact. (IT Corporation, August 1997, Draft RI Report, Figure 7-6

Contaminants: Lead 11.4 ug/L Arsenic 16.2 ug/L Chromium 46.8 ug/L Aluminum 1510.0 ug/L Manganese and compounds 2250.0 ug/L Iron 7120.0 ug/L

Groundwater: Low Risk

All samples were taken within the site boundaries; therefore, contaminant migration cannot be determined using available data. (IT Corporation, August 1997, Draft RI Report for LF-07, LF-10, LF-11, LF-12, and LF-13, Figure 4-18a) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Carbazole 4.9 ug/L 1,4-Dichlorobenzene 6.6 ug/L Lead 22.0 ug/L Chlorobenzene 25.0 ug/L Bis(2-Ethylhexyl)Phthalate 59.0 ug/L Arsenic 61.4 ug/L Vanadium 92.1 ug/L Manganese and compounds 3570.0 ug/L Aluminum 8560.0 ug/L Iron 58100.0 ug/L

Soil: Risk Not Evaluated

Contaminants: Toluene 30.0 mg/kg Ethylbenzene 720.0 mg/kg Xylene (Mixed) 725.0 mg/kg

Groundwater: Risk Not Evaluated

Sediment (Ecological): Risk Not Evaluated

Sediment (Human): Risk Not Evaluated

Soil: Risk Not Evaluated

Surface Water: Risk Not Evaluated

Surface Water (Ecological): Risk Not Evaluated

Soil: Medium Risk

Surface soil has the potential to migrate into surface water runoff that flows into the Back River. Soil can also emit fugitive dust and volatize into the outdoor air. (Radian International, December 1997, MAP, p. E-WP-02 CSM) Potential receptors may include a groundskeeper or construction worker.

Contaminants: Benzo(a)Pyrene 0.000433 mg/kg 4,4-DDE 0.00287 mg/kg 4,4-DDT 0.004900000000000001 mg/kg Arsenic 0.00897 mg/kg Dieldrin 0.0101 mg/kg Chromium 0.0526 mg/kg Silver and compounds 0.107 mg/kg Manganese and compounds 0.199 mg/kg Aluminum 13.6 mg/kg Iron 20.1 mg/kg

Groundwater: Low Risk

Groundwater has the potential to migrate to the Back River and into indoor air. (Radian International, December 1997, MAP, p. E-WP-02 CSM) Groundwater occurs in 3 aquifer systems which are suspected to contain moderate to poor quality water due to high salinity and total dissolved solids and has no value as a conventional water supply. (Radian International, December 1997, MAP, p. K/L-2)

Contaminants: Dieldrin 0.19 ug/L 1,4-Dichlorobenzene 0.62 ug/L Antimony and compounds 7.01 ug/L Arsenic 41.2 ug/L Manganese and compounds 1200.0 ug/L