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1.0 Introduction <br /> rr Corporation (IT) was retained to perform groundwater monitoring at the Van den Bergh <br /> Foods Company facility (Site Code 22073), located m Stockton, California (Figure 1) <br /> 1.1 Fedllty Background <br /> ' The Van den Bergh Foods Company facility is located at 1400 Waterloo Road, Stockton, <br /> California. The facility has been used for commercial food processing for over 30 years, and <br /> ' is located on the flat terrain of California's Central Valley. The soils underlying the facility <br /> consist largely of silts and clays with interbeds of sands A five to ten foot thick sand unit is <br /> encountered at a depth of approximately 45 feet In May 1996, groundwater at the site was <br /> encountered at average depths of 51.9 and 52 3 feet for the shallow and deeps wells, <br /> respectively. The site groundwater has historically been calculated to flow in different <br /> ' directions at a low gradient. <br /> ' 1.2 Site History <br /> On May 26, 1984, a 1000-gallon gasoline tank, a 550-gallon Stoddard (petroleum) solvent <br /> tank, and a 550-gallon diesel tank were removed from a common excavation by American <br /> Environmental Management Corporation. Analytical results of native soil samples collected <br /> from the bottom of the tank pit yielded concentrations of total petroleum hydrocarbons (TPH) <br /> as diesel and chlorinated organic compounds. The tank excavation was subsequently <br /> backfilled <br /> 1 <br /> Subsequent investigative and corrective actions implemented at the site have included <br />' • Drilling of three soil borings to 30 feet (R-1, R-2, and R-3) by Stauffer in 1987 <br /> • Installation of three monitoring wells (MW-1 to 63 feet, MW-2 to 64 5 feet, and <br /> MW-3 to 65 feet) by Roy F Weston, Inc. in October 1988. <br /> • Drilling of one soil boring (B-1 to 81.5 feet) and one monitoring well (MW-4 to <br /> 95 feet) by a Remediation Services, Inc (RSI) subsidsary, BSK & Associates <br /> (BSK), to October 1992. <br />' • Dfilling of four soil borings (B- <br /> 101 to 75 feet, B-102 to 75 feet, B-103 to 75.5 <br /> feet, and B-104 to 75 feet) by BSK in February 1993. <br /> • Installation of two monitoring wells (MW-5 to 90 feet and MW-6 to 89 feet) by <br />' BSK in December 1993. <br /> M7I07-22-96/VDBF196-0016 db 1-1 <br />