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ATTACHMENT A <br /> SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Chevron 9-3232, 8660 Lower Sacramento Road, Stockton, CA <br /> collected beneath the gasoline USTs at beneath the gasoline USTs at concentrations between <br /> 0. 11 and 0.96 mg/kg. Benzene was not detected in any of the samples from beneath the <br /> gasoline USTs. One soil sample from 10 feet beneath the waste oil UST contained TPHg <br /> (2.0 mg/kg), TPHd (810 mg/kg), tetrachloroethane (0.5 mg/kg), and O&G (79 mg/kg). A <br /> soil sample from the opposite end of the waste oil UST pit at 10 feet bgs contained O&G <br /> (110 mg/kg) . A groundwater sample from the gasoline UST pit did not contain TPHg or <br /> benzene, but did contain MtBE (6.0 mg/kg). <br />