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a <br /> IM-M-, <br /> WESTERN C t: ui, t} t. tc IIr• SoL' ttccS , INC . ^ <br /> t <br /> EXECUTIVE SUMMARY <br /> 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 /> ill] 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 f <br /> ' (ft)below grade: One of the boreholes was completed as a 4-inch diameter groundwater monitor well, <br /> eas <br /> MW-4, Groundwater samples from well MW-4 and wells MW-1 through MW-3,installed by another <br /> i <br /> consultant,were collected on 3 October 1939. <br /> Tota] purgcable 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 barirgs B-11,8-14,and 8.15,located on <br /> the west and south side of the former location of the underground tanks,at 28 ppm,120 ppm,and 2400 <br /> 4ppm,respectively. Aromatic hydrocarbons including benzene,toluene,ethylbenzene,and total xylenes <br /> (BTEX) were not detected in most of the soil samples analyzed. However,BTEX wncentratians a[ <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(MW-4),and 15.3 ft below grade in boring B I1. <br /> Groundwater samples collected from all four monitor wells contained no detectable <br /> w concentrations of TPPH or BTEX. <br /> t Groundwater flow beneath the site on 3 October 1989 was in an east-southeast direction at a <br /> very shallow gradient of 0.1%. <br /> A survey of California Department of Water Rrsource's wall logs identied 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 /> 076R1DE9.WP <br /> eFWe <br />