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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report a Sixteen (16) of the thirty soil samples were reported to contain benzene concentrations above laboratory detection limits Soil sample BI-33 was reported to contain the highest benzene concentration at 45 mg/kg, e Fifteen (15) of the thirty soil samples were reported to contain MTBE concentrations above laboratory detection limits Soil sample B1-43 was reported to contain the highest MTBE concentration at 21 mg/kg, a On April 14, 1999 depth to groundwater measurements were made and one (1) groundwater sample was collected from each of the two (2) new monitoring wells MW I and MW2, a Depth to static groundwater level averages -23 feet above msl An accurate groundwater gradient and direction of flow can not be calculated due to the limited number of wells at the SITE However, the regional direction of groundwater movement in the vicinity of the SITE is approximately in a westerly direction, a The groundwater samples from both wells (MW-1 and MW-2) were reported to contain TPH-G and TPH-D concentrations above laboratory detection limits Groundwater sample MW-1 was reported to contain the highest TPH-G and TPH-D concentration at 244,000 micrograms per later (ug/1) and 240,000 ug/l, respectively, • a Groundwater samples from wells MW-1 and MW-2 were both reported to contain benzene concentrations of 47,600 ug/I and 28,900 ug/l, respectively, • MTBE was the only oxygenated compound to be detected at concentrations above laboratory ' reporting limits in both groundwater samples, at concentrations of 46,500 ug/l reported from sample MW-1 and 644 ug/1 from sample MW-2, ' a One (1) 1,000 gallon single wall steel waste oil UST (No 4) was excavated and removed from the SITE in poor condition and one (1) 1,000 gallon UST of unknown contents (No 8) was abandoned in-place, a Two 2 soil samples (WO-N and WO-S) were collected from each end of the excavated waste oil UST approximately two (2) feet beneath each invert for a total depth of ' approximately 9 feet bgs One (1) soil sample (PL-1) was collected approximately 2 feet into the sidewall directly below the fill-port pipe, approximately 6 feet bgs, ' a None of the soil samples associated with the waste oil UST were reported to contain TPH-G, TRPH, BTEX, or MTBE at concentrations above the laboratory detection limits, ' a Soil samples collected from borings B-3 and SB-3 were used as confirmation for the in-place abandonment of UST No 8 A total of seven (7) samples were collected, all of which were ' reported as non-detect for TPH-G, TPH-D, BTEX, MTBE and TRPH, ' 9