ARCHIVED REPORTS_2019-MAY 15 SITE ASSESSMENT REPORT

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15 May 2019 AGE Project No. 14-3002 Page 10 of 17 Five (5) soil samples collected from borings B9, B16, B18, B20 and B40 were analyzed for dioxin/furans; six (6) soil samples collected from borings B7, B8, B30, B33, B40, and four samples collected MW -1 through MW4 were analyzed for VOCs; and one (1) soil sample collected from B40 (B40-13) required STLC analysis. Additionally, twelve (12) soil samples collected throughout the site were analyzed for hexavalent chromium by the DI WET method. The following analytes were detected in the soil samples: • Arsenic, barium, chromium, cobalt, copper, lead, vanadium and zinc were detected in all the soil samples analyzed (except for lead in four samples) at the following maximum concentrations: arsenic at 3.5 milligrams per kilogram (mg/kg), barium at 122 mg/kg, chromium at 20 mg/kg, cobalt at 9.5 mg/kg, copper at 25.8 mg/kg, lead at 333 mg/kg, vanadium at 101 mg/kg and zinc at 130 mg/kg. The elevated lead concentration (333 mg/kg) was detected in sample B40-13, only 0.5 feet below glass processing waste. The next highest lead concentration was 18.4 mg/kg. Additionally, antimony was detected in four soil samples at a maximum concentration of 2.2 mg/kg and nickel was detected in seven samples at a maximum concentration of 8.8 mg/kg (Table 2). • Lead was detected in sample B40-13 at a concentration 10 times greater than the STLC California Hazardous Waste Limit for lead (5.0 milligrams per liter; mg/l). Therefore, the sample was analyzed for lead by the STLC method; the STLC concentration detected was 1.56 mg/l, significantly below the hazardous waste limit (Table 3). • Hexavalent chromium was detected by DI WET in one of twelve samples at a concentration of 0.0042 mg/l (B6-5). The concentration was just above the laboratory reporting limit of 0.002 mg/l and significantly below the MCL and hazardous waste limit (Table 3). • SVOCs and PAHs were not detected above laboratory reporting limits in any of the soil samples analyzed (Table 4). • Isopropyl benzene, tert-butylbenzene, 1,2,4-trimethylbenzene, and n-butylbenzene were detected in B40-17 at concentrations ranging from 2.8 mg/kg to 71.6 mg/kg, however, these concentrations were below their environmental screening levels. VOCs were not detected above laboratory reporting limits in any other samples analyzed (Table 4). • PCBs were detected in 8 of 33 soil samples at concentrations ranging from 0.082 mg/kg in B15-3 to 6.24 mg/kg in B35-5. PCBs were detected in samples B30-3, B31-5, B35-5, and B43-5 at concentrations above the ESL of 0.94 mg/kg, but below the hazardous waste limit of 50 mg/kg (Table 4). • TPH-g was detected in 2 of 36 soil samples at concentrations of 10.8 mg/kg in B40-13 and 79.9 mg/kg in B40-17. TPH-d was detected in 6 of 36 soil samples at concentrations ranging from 2.8 mg/kg in B34-5 to 1,990 mg/kg in B40-13 and