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• Bluish wUrte ine cr stallpowder identified beneath the pavement upwelling areas was determined Y to contain high copper concentrations and was tentatively identified as copper sulfate, an inorganic pesticide The powder has no hazardous propertles but is toxic if ingested The lateral extent of the buried chemical was not determined, but is not expected to extend beyond the upwelling areas Up to 100 cubic yards of soil may require removal and disposal at a Class I landfill 3.3 OINIS A total of eight soil and three grab gioundNNater samples were collected fiom three soil borings (B30 through B32) advanced adjacent to the former location of a 10 000-gallon diesel UST and 5,000-gallon gasoline UST southeast of the OMS (Figure 4) Soil samples collected fiom 35 and 40 feet bgs in boring B30, located east of the former gasoline UST, detected TPH-G concentrations up to 47 mg/kg, benzene to 3 9 nrg/kg, toluene to 0 88 mg/kg, ethylbenzene to 2 3 mg/kg, and xylenes to 15 mg/kg A grab ground«ater sample collected from boring B30 (B30-45) contained concentrations of TPH-g (74 mg/L), TPH-d (1 4 mg/L), benzene (3 9 rng/L), toluene (6 mg/L). ethylbenzene (0 92' mg/L), and xylenes (4 9 mg/L) Fuel oxygenates were not detected in any of the soil or groundwater samples collected Table 4 sununarrzes the laborator y analytical results from OMS sampling • Samples collected fiom boring B31, located south of the former gasoline UST detected TPH-d (260 mg/kg) at 35 feet bgs Both the 35-foot and 40-foot soil samples contained concentrations of toluene (to 3 4 mg/kg), ethylbenzene (to 18 mg/kg), and xylenes (to 50 4 mg/kg) A grab groundwater sample collected fiom boring B31 contained concentrations of TPH-g (2 4 mg/L), benzene (0 053 mg/L), toluene(0 38 rng/L), ethylbenzene (0 33 mg/L), and xylenes (1 55 mg/L) Lead concentrations detected in B32 soils were well below actionable levels and in the range of expected background Samples collected from boring B32 located west of the former gasoline UST, detected TPH-d (63 mg/kg) at 35 feet bgs Both the 35 foot and 40 foot soil samples contained concentrations of benzene (to 0 24 mg/L) toluene (to 0 37 mg,'kg), ethylbenzene (to 1 1 mg/kg), and xylenes (to 5mg/kg) A grab grounder ater sample collected from boring B32 contained concentrations of TPH-g (8 5 mg/L), TPH-J (8 5 mg/L), benzene (24 mg/L), toluene (0 38 mg/L) ethylbenzene (2 3 mg/L) and xylenes (3 72 mg/L) Lead concentrations detected in B33 soils were well below actionable levels and in the range of expected background Laboratory analysis of the soil sample exhibiting the highest lead concentration did not detect LUFT lead Eight soil samples and two grab-groundwater samples were collected fiom two soil borings (B33 and B34) advanced adjacent to the vehicle inspection rack located south of the OMS building One sample, collected from boring B33 at five feet bgs, contained 100 mg/kg of TPH as motor oil One sample collected from boring B34 at 35 feet bgs, contained 0 051 mg/kg of TBA Laboratory analysis did not detect concentrations of extractable hydrocarbons, purgeable • hydrocarbons, or VOCs in the other soil or groundwater sarnples 104700 4766 230(09SEPF2004 9