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Bluish white crystalline powder identified beneath the pavement upwelling areas was determined <br /> to contain high copper concentrations and was tentatively identified as copper sulfate, an <br /> inorganic pesticide. Samples of the bluish white crystalline powder, collected from the <br /> subsurface below the pavement upwelling in the vehicle storage yard, were submitted for hazard <br /> chemical evaluation. The findings of the evaluation determined that the powder is non <br /> flammable, exhibits a neutral pH, is not reactive with air or water, is not an oxidizer, does not <br /> exhibit organic characteristics, and does not contain cyanide or sulfides. The sample was <br /> tentatively identified as exhibiting the visual, chemical and physical characteristics of copper <br /> sulfate. The powder has no hazardous properties, but is toxic if ingested. The lateral extent of <br /> the buried chemical was not determined, but is not expected to extend beyond the upwelling <br /> areas. Up to 100 cubic yards of soil may require removal and disposal at a Class I landfill. <br /> 3.3 OMS <br /> A total of eight soil and three grab groundwater samples were collected from three soil borings <br /> (B30 through B32) advanced adjacent to the former location of a 10,000-gallon diesel UST and <br /> 5,000-gallon gasoline UST southeast of the OMS (Figure 4). <br /> Soil samples collected from 35 and 40 feet bgs in boring B30, located east of the former gasoline <br /> UST, detected TPH-G concentrations up to 47 mg/kg, benzene to 3.9 mg/kg, toluene to 0.88 <br /> mg/kg, ethylbenzene to 2.3 mg/kg, and xylenes to 15 mg/kg. A grab groundwater sample <br /> collected from boring B30 (B30-45) contained concentrations of TPH-g (74 mg/L), TPH-d (1.4 <br /> mg/L), benzene (3.9 mg/L), toluene (6 mg/L), ethylbenzene (0.92 mg/L), and xylenes (4.9 <br /> mg/L). Fuel oxygenates were not detected in any of the soil or groundwater samples collected. <br /> Table 4 summarizes the laboratory analytical results from OMS sampling. <br /> Samples collected from boring B31, located south of the former gasoline UST, detected TPH-d <br /> (260 mg/kg) at 35 feet bgs. Both the 35-foot and 40-foot soil samples contained concentrations <br /> of toluene (to 3.4 mg/kg), ethylbenzene (to 18 mg/kg), and xylenes (to 50.4 mg/kg). A grab <br /> groundwater sample collected from boring B31 contained concentrations of TPH-g (2.4 mg/L), <br /> benzene (0.053 mg/L), toluene (0.38 mg/L), ethylbenzene (0.33 mg/L), and xylenes (1.55 mg/L). <br /> Lead concentrations detected in B32 soils did not exceed the USEPA Region 9 PRGs for direct <br /> contact exposure pathway for industrial soil. <br /> Samples collected from boring B32, located west of the former gasoline UST, detected TPH-d <br /> (63 mg/kg) at 35 feet bgs. Both the 35 foot and 40 foot soil samples contained concentrations of <br /> benzene (to 0.24 mg/L), toluene (to 0.37 mg/kg), ethylbenzene (to 1.1 mg/kg), and xylenes (to <br /> 5mg/kg). A grab groundwater sample collected from boring B32 contained concentrations of <br /> TPH-g (8.5 mg/L), TPH-J (8.5 mg/L), benzene (24 mg/L), toluene (0.38 mg/L), ethylbenzene <br /> (2.3 mg/L), and xylenes (3.72 mg/L). Lead concentrations detected in B33 soils did not exceed <br /> the USEPA Region 9 PRGs for direct contact exposure pathway for industrial soil. Laboratory <br /> analysis of the soil sample exhibiting the highest lead concentration did not detect LUFT lead. <br /> 104700.4766.230/08SEPT2004 9 <br />