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1.0 Introduction <br /> IT Corporation (TI') was retained by Van den Bergh Foods Company's Stockton facility to <br /> respond to the San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) request to determine the mass loading to the groundwater from residual diesel <br /> that is present in the soils below the former location of the facility's underground storage tank <br /> (UST) site (Site Code 22073) <br /> Van den Bergh Foods, PHS/EHD and IT agreed that a computational model capable of <br /> predicting the mass loading of diesel to the groundwater would adequately evaluate site <br /> conditions The model selected was the latest version of Vadose zone LEACHmg model <br /> (VLEACH), a finite difference computational model, issued by the United States <br /> Environmental Protection Agency (USEPA) VLEACH has been widely used to calculate the <br />� impact of contaminants in the vadose zone on groundwater quality, and has been used at, similar sites within San Joaquin County. The USEPA's May 1995 version, Vadose zone <br /> LEACHmg and Saturated zone Mixing model (VLEACHSM) was used, since it combines <br /> one-dimensional vadose zone transport with contaminant dispersion, decay, and saturated zone <br /> mixing This document summarizes the modeling that was performed, describes the results <br /> that were obtained, and provides recommendations for the site <br /> 2.0 Background <br /> The Van den Bergh Foods Company facility is located at 1400 Waterloo Road, Stockton, <br /> California (Figure 1) The facility has been used for commercial food processing for over 30 <br /> years, and is located on the flat terrain of California's Central Valley On May 26, 1984, a <br /> 1000-gallon gasoline tank, a 550-gallon Stoddard (petroleum) solvent tank, and a 550-gallon <br /> diesel tank were removed from a common excavation by American Environmental <br /> Management Corporation Analytical results of native soil samples collected from the bottom <br /> of the tank pit yielded concentrations of total petroleum hydrocarbons (TPH) as diesel and <br /> chlorinated organic compounds The tank excavation was subsequently backfilled <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 /> MZ/11-01-96/VDBF/96-0022 LF j <br />