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1.0 Introduction <br />' TT Corporation (IT) was retained to implement interim corrective actions at a petroleum <br /> hydrocarbon impacted site (Site Code 22073) on the Van Den Bergh Foods Company facility, <br /> located in Stockton, California (Figure 1) These actions were conducted in response to a <br /> directive issued by San Joaquin County Public Health Services - Environmental Health <br /> Division (County) on August 29, 1994. Field procedures employed during the convective <br /> action followed those outlined in IT's "Interim Corrective Action Work Plan," dated <br /> November 1994. <br /> 1.1 Facility Description <br />' The Van Den Bergh Foods Company facility is located at 1400 Waterloo Road, Stockton, <br /> California (Figure 1) The area surrounding the facility is occupied by commercial and <br />' residential properties This facility, constructed on the flat terrain of California's Central <br /> Valley, has been used for commercial food processing for over 30 years The site hes at <br /> approximately 20 feet above mean sea level, as indicated on the USGS Stockton West 7.5 <br /> minute topographic sheet. <br /> The soils underlying the facility consist largely of silts with mterbeds of clay and sand, with <br /> grain size generally increasing with depth. Groundwater in the area is found at an <br /> approximate depth of 60 feet. Groundwater flow direction has been observed to be highly <br /> variable, apparently due to seasonal effects. However, the calculated groundwater gradient is <br /> consistently low (0.001 ft/ft to 0.006 ft/ft). <br /> 1.2 Site History <br /> On May 26, 1986, 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. Analytical <br /> iresults of native soil samples collected from the bottom of the tank pit yielded a maximum of <br /> 26,000 ppm total petroleum hydrocarbons (TPH) as diesel and chlorinated organic compounds <br /> (up to 100 ppm 1,4-dichlorobenzene). The tank excavation was subsequently backfilled <br /> (Figure 2). <br /> Subsequent subsurface investigations were conducted to determine the nature and extent (if <br /> any) of impacted soil and groundwater. Analytical results of a soil boring drilled by Stauffer, <br /> iin 1987, to a depth of 30 feet through the former excavation indicated TPH as diesel <br /> M7JM23/95/VD13F/95-0M 1 <br />