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COrreetEve Action Plan 3 TIM,.Oil Company PropertyNo 04-049 14000 Fast Highway 88 Lockeford,CA September 8 1998 22 PREVIOUS INVESTIGATI®NS Previous environmental activities and investigations conducted at the site have included the following Cl Replacement of 3 underground storage tanks (USTs) in 1991 0 Drilling of 26 soil borings between 1992 and 1996 C:l Installation of eight soil vapor inlet/extraction wells (W-1 through W-8) between 1992 and 1993 0 Installation of 10 (MW-1 through MW-10) groundwater monitoring wells between 1994 and 1995 11 Performance of soil vapor extraction(SVE) tests in 1992 and 1998 Q Groundwater monitoring and sampling since the first quarter of 1995 In September 1991 as part of a facility upgrade, three USTs were removed from the Site by Scott Company In addition, pump islands and dispensers were removed and replaced After removal of USTs and pump islands, soil samples were collected from the tank and pump island excavations The highest levels of petroleum hydrocarbons were found beneath the 6,000 gallon and the 8,000 gallon USTs at 8,900 parts per million (ppm) and 6,700 ppm total petroleum hydrocarbons as gasoline (TPHg), respectively (Table 3) Soil samples analyzed for total lead were below the laboratory detection limit Approximately 150 cubic yards of soil was removed from the UST and pump island excavations Soil samples collected from the excavated soil after it was stockpiled indicated it contained levels of petroleum hydrocarbons up to 2,700 ppm TPHg and 0 98 ppm benzene This soil was returned to the excavation as backfill to be remediated concurrently with the rest of the Site In September 1992, a preliminary Site assessment was conducted by Canome Environmental to further evaluate subsurface conditions at the Site This investigation involved drilling a total of nine Time OE11Lockeford\CAP wpd