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1 <br /> SECTION 2 <br /> SITE HISTORY <br />' The Safeway Meat Packing Facility stored diesel fuel in four 12,000- <br /> gallon underground tanks (USTs), as shown in Figure 2-1 The <br /> primary use of the fuel was to service trucks visiting the facility A <br /> generator also pumped fuel from the USTs to a boiler used as a <br /> secondary heating source <br /> After removal of the USTs, Safeway no longer maintains a capacity to <br />' fuel vehicles at the facility A small aboveground tank now supplies <br /> fuel to the boiler <br />' Results of Previous Investigations <br />' 3yeiss Associates. On April 7 and April 8, 1987, WA supervised the <br /> drilling of nine soil borings (B-1 through B-9) around the four tanks <br /> Soil samples were collected from eight borings and were analyzed for <br /> total petroleum hydrocarbons (TPH) and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) One soil sample at boring B-2, <br /> collected from 20 7 feet below grade, contained TPH at 1,100 ppm. No <br /> other soil sample had detectable concentrations of TPH or BTEX <br /> 2 <br /> Betwee an Jun , 1987, the four underground tanks were <br /> removed June recision nstru0ments of Stockton. Gravel fill removed <br /> from the pit was slightly stained, but hydrocarbon staining was not <br /> observed on the excavation walls A water sample collected from the <br />' pit contained 1 1 ppb total xylenes <br /> Three monitoring wells (MW-1 through MW-3) were installed <br />' between August 12 and 14, 1987 No petroleum hydrocarbons were <br /> detected in any of these borings during drilling activities nor in the <br /> groundwater from subsequent sampling of the wells. <br />' On March 12 and 15, 1988, 11 soil samples were collected from 0 v to <br /> 10 foot below the concrete slab and analyzed for TPH In a letter <br />' dated June 10, 1988 to Gordon Boggs of the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB), WA requested permission <br /> to leave the concrete slab in the excavation based on the analytical <br /> results of the March 1988 soil sampling. WA contended that the <br /> hydrocarbons that had leaked from the tanks had migrated laterally <br /> and downward, away from the edges of the slab, and were contained <br /> in soil adjacent to the southwestern corner of the excavation <br />' 2-1 <br />