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CLEARWATER ;. - G: R -O U. P I `N C I.O. INTRODUCTION This document,.prepared by Clearwater Group, Inc: (Clearwater), presents a workplan for the sampling and removal of-stockpiled soil, the,'backfilling of two excavations,• and continued site assessment at the Olivarez Property in ' Stockton, California. 1.1 Site Description ' The site is located at 300 South California Street, Stockton, in a neighborhood Thai is`mixed-residential and-commercial (Figure T)'.' It is located just south of Lafayette Street and the elevated . Crosstown' Freeway. The property was formerly a .fuel service station and it is currently used as a vehicle- service center. Gasoline and diesel fuel-were:dispensed from underground storage tanks (USTs) located along' the northern property boundary adjacent to Lafayette Street. The-site layout and former UST locations are presented:in Figure 2. Five fuel USTs and one used motor oil tank were removed from the site (by' . others)' in 'November 1992. Neither of the two excavations have been backfilled. The former fuel tank excavation on the north side of the ,property is approximately 13 feet deep and has thick vegetation cover over the bottom of it. Approximately.500-600 cubic yards (cy).of soil were removed from. the , excavation; and the soil is'currently stockpiled on'the east side of thetY ro er . P P _ . The waste oil tank:excavation is approximately four feet deep; approximately 3 to 4'cy of soil are stockpiled adjacent io that excavation: ' 1.2 Previous Work r The.results of analysis of soil samples collected during tank 'removal activiiies indicated the presence of-hydrocarbons it the subsurface. On January 19; 1995 Clearwater Group, Inc: _(Clearwater). submitted a Workpian',p for Treliminary Site Assessment of the subject location. ' The .workplan was approved by the I San Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) on February.9, 1995. D-105WP 7/95 2