ARCHIVED REPORTS_XR0008914 - Laserfiche WebLink

Home Browse Search

1.0 Introduction ' IT Corporation (IT) was retained to perform groundwater monitonng at the Van den Bergh ' Foods Company facility (Site Code 22073) located in Stockton, California (Figure 1) ' T.i Facility Description The Van den Bergh Foods Company facility is located at 1400 Waterloo Road, Stockton, California (Figure 1) The area surrounding the facility is occupied by commercial and residential properties This facility, constructed on the flat terrain of California's Central Valley, has been used for commercial food processing for over 30 years. The site lies at ' approximately 20 feet above mean sea level, as indicated on the USGS Stockton West 7 5 minute topographic sheet The soils underlying the facility consist largely of silts with mterbeds of clay and sand, with grain size generally increasing with depth Groundwater in the area is currently found at an approximate depth of 65 feet Groundwater flow direction has been observed to be highly vanable, apparently due to seasonal effects However, the typical groundwater gradient is consistently low (0 001 ft/ft to 0 006 ft/ft) ' 1.2 Site History On May 26, 1986, a 1000-gallon gasoline tank, a 550-gallon Stoddard (petroleum) solvent ' tank, and a 550-gallon diesel tank were removed from a single excavation by American Environmental Management Corporation Analytical results of native soil samples collected from the bottom of the tank pit yielded concentrations of total petroleum hydrocarbons (TPH) as diesel and chlonnated organic compounds The tank excavation was subsequently backfilled Subsequent investigative and corrective actions implemented at the site have included • Dnlling of three soil bonngs to 30 feet (R-1, R-2, and R-3) by Stauffer in 1987 • Installation of three monitoring wells (MW-1 to 63 feet, MW-2 to 64 5 feet, and MW-3 to 65 feet) by Roy F Weston, Inc in October 1988 MZ/09-20-95/VDBF/95-0027 NBR 1_1