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_iTERNGEOLOGICRESOURCES LNC . <br /> I{ <br /> 4 � <br />! EXECUTIVE SUMMARY <br />+ s <br /> 1 <br /> y Western Geologic Resources, Inc. (WGR) conducted a subsurface investigation near the <br /> location of former underground fuel storage tanks on the south side the Safeway Meat Packing Plant, <br /> - 1111 Navy Drive in Stockton, California, in September and October 1989. Six boreholes were drilled <br /> from which soil samples were collected for chemical analysis. Groundwater was observed at 26.8 feet <br /> i <br /> (ft) below grade. One of the boreholes was completed as a 4-inch diameter groundwater monitor well, <br /> MW4. Groundwater samples from well MW-4 and wells MW-1 through MW-3, installed by another <br /> j consultant, were collected on 3 October 1989. i <br /> Total purgeable petroleum hydrocarbons (TPPH), characterized as diesel #2, were detected <br /> only in the soil samples from 25 ft to 25.5 ft below grade in borings B-11, B-14, and B-15, located on <br /> �RK� the west and south side of the former location of the underground tanks, at 28 ppm, 120 ppm,and 2400 <br /> ppm, respectively. Aromatic hydrocarbons including benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX) were not detected in most of the soil samples analyzed. However, BTEX concentrations of <br /> 0.007 ppm or less were detected in samples from 15.5 ft below grade in boring B-14, from 25.5 ft and <br /> 36.5 ft below grade in boring B-10 (MW4), and 15.3 ft below grade in boring B-11. <br /> Groundwater samples collected from all four monitor wells contained no detectable <br /> concentrations of TPPH or BTEX. <br /> - Groundwater flow beneath the site on 3 October 1989 was in m east-southeast direction at a <br /> very shallow gradient of 0.1%. <br /> A survey of California Department of Water Resource's well logs identified ten registered wells <br /> within a one-half mile radius of the site and three additional wells possibly within one-half mile of the <br />( site. None of these wells are known to occur within 1,000 ft of the site. <br /> r <br /> l <br /> 076R1DE9.WP i <br /> l <br />