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ATTACHMENT A <br /> SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Chevron 9-3232, 8660 Lower Sacramento Road, Stockton, CA <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 /> i <br />