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t i <br /> SIERRA <br /> 6Ui�12ARY <br /> SES drilled and installed four manitori:,f;u:-Us(MW-2 through MW-5)at t7ttevron Service <br /> Station#cl-6171 located at 6633 Pacific Avenue in Stockton.California. Hydrocarbons were not . <br /> R., <br /> detected ut loll samples analyzed from the borings or in ground water samples collected from the <br /> four wells. Seven harts per.billion(ppb)of 1,1-dichloroe:thare were detected above the Department <br /> of Health Services(DHS) Recommended Action Level'(RAL)of 5 ppb in the ground water sample <br /> F from well MW-5, located next to the waste oil tank. Total coliform was detected at 240 <br /> MPN/100ml in the groundwater sample from well MW-4,located within 50 ft of a sanitary sewer <br /> line. <br /> n f <br /> The site 1•a underlain by alluvial sediments. The depth to ground water is approximately.. <br /> 55 ft below grade. 7'he ground water gradient Y�enealh the site Is riear]y flat(approxin: Se1y 0:t101` <br /> i ft/ft)and is apparently to the southeast: <br /> Thirty water wells were identified within one-half mile of the site. Two of the wells are <br /> potentially downgradient of i.he site. The closest wells are eight monitoring wells and three county <br /> wells located approximately,one hundred to three hundred feet from the site (at the properties <br />` directly Nest.south and north of the site). <br /> t <br />� S � <br /> n I <br /> t <br /> c <br /> Page 1 <br />