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1 <br /> 1.0 introduction <br /> IT Corporation (IT) was retained to submit an interim corrective action plan (Plan) for a <br />' petroleum hydrocarbon impacted site at the Van Den Bergh Foods Company facility, located <br /> at 1400 Waterloo Road in Stockton, California (Figure 1) This Plan is being submitted in <br /> response to a directive issued by San Joaquin County Public Health Services - Environmental <br /> Health Division (County) <br /> 1.1 Facility Background <br /> The facility has been used for commercial food processing for over 30 years The facility is <br /> ' constructed on the flat terrain of California's Central Valley The soils underlying the facility <br /> consist largely of silts with lnterbeds of clay and sand, with grain size generally increasing at <br /> depth Groundwater in the area is found at an approximate depth of 70 feet, and has been <br /> observed to flow in different directions, at a low gradient (0 001 to 0 002 ft/ft) based on <br /> seasonal variations <br /> ® In 1986, three petroleum underground storage tanks (USTs) were removed from a common <br /> excavation at the facility (Figure 2). Detectable petroleum hydrocarbon concentrations were <br /> encountered in soil samples collected from the base of the tank excavation Some of the <br /> tanks were suspected to have leaked at this site Subsequent soil and groundwater <br /> investigations resulted in defining the extent of etroleum-impacted soil ediate <br /> vicinity of the former UST excavation. <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 (AEMC). Analytical results of native soil samples <br /> collected from the bottom of the tank pit yielded a maximum of 26,000 ppm total petroleum <br /> hydrocarbons (TPH) as diesel and chlorinated organic compounds (up to 100 ppm 1,4- <br /> dichlorobenzene) <br /> Analytical results of a soil boring drilled by Stauffer (1987) to a depth of 30 feet through the <br /> former excavation indicated TPH as diesel concentrations ranging from 14,000 ppm to 61,000 <br /> ppm with associated aromatic hydrocarbons (BTEX). <br /> M7J11-29-94(UST/940201 nbr 1 <br />