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r <br /> SIERRA <br /> Hydrocarbons as gasoline, BTEX, EDB and Pb were not detected In the ground water <br /> samples from wells MW-2,MW-3,MW-4 and MW-S: TCG.•and metals(NI.Cd.'Cr and Zn)were not <br /> detected In the ground water sample from well MW-5. The groune ;nater sample ffom well MW-5 <br /> contained 7 ppb I,1-dichloroethane,which =ceeds the DHS RAI,of 5 ppb. No other VOCs were <br /> detected in the ground water sample from well MW-5. Total coliforrnsvas detected al 240 <br /> MPH/100rn1 in:he ground water sample from welt MW-4,Iocated within 50 ft of a sanitary sewer <br /> line; <br /> i <br /> 6-CONCLUSIONS <br /> The site is underlain by alluvial sediments consisting of clay,silt and sand. The ground <br /> water elevation in the wells has dropped approximately 10 ft since 1987 when the first well was <br /> installed at the site. The� round water flow direction beneath the site Is apparently PAarer,Uy to the <br /> j - southeast;however the gradient is flat (0.001 ft/fi) and additional well points maybe needed to <br /> ' verify the flow.direction. <br /> Hydrocarbons were not detected in soil samples from any of the soil borings. TPPH,BTEC, <br /> EDS and total lead were not deteettd In ground water samples from monitoring wells MW-2,MW- <br /> i <br /> 3, MW-4 and MW-5. TOG and metals were not detected In the ground water sample from well <br /> MW-5. However,the ground water sample from well MW-5 eontaintd 7 ppb 1,1-dichloroethane, <br /> which exceeds the DHS RAL of 5 ppb. <br /> a There are two other potential sources of volatile organic compounds, the dry cleaners <br /> located in the Lincoln Center -rtY <br /> ro r <br /> P P (northwest of the site)and the dry cleaners southwest of <br /> ' the site. <br /> j Thirty water wells were Identified within one-half mile of the site. Two of the wells are <br /> !" potentfally downgradient of the site;however both wells are more than one-quarter mile from the <br /> ({ site. There are eight monitoring wells on properties directly north,south,and west of the Chevron <br /> site. These wells were apparently installed to investigate a TCE spill on the adjacent Lincoln <br /> Center property. In addition, three San Joaquin County wells are located west and northwest of <br /> { the Chevron site. <br /> Page 8 <br /> a <br />