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s <br /> I � <br /> PHASE 1YQROGEOt oGIC 1N1'ES GA ON <br /> y..a 4491 Wes[Latham Ferry Road.Tracy,Celifamia - -- <br /> De1ta PrOi-No.40.91-732 <br /> Page 7 <br /> W <br /> Chemical analyses of the ground wage from monitoring wells MW-1 and MW-2 indicated the presence of <br /> TPH as gasoline at concentrations of 140 and 6,400 ppb, respectively. Concentrations of benzene was F <br /> detected in monitoring wells MW-1 and MW-2 at 2.3 and 710 ppb, respectively(Table 4). Copies of the <br /> certified-laboratory reports are presented in Appendix E. ' <br /> 1`} <br /> 4SUMMA RY <br /> {` Based on the soil samples collected at 5-foot intervals at the three monitoring well locations,the site appears <br /> �w to be underlain by sandy silt with a 2-foot-thick lens of sand at approximately 3 feet below the ground <br /> i- surface. The water table was observed to Le approximately 10 feet below the ground surface. The direction <br /> ,-. of ground water flow was calculated to be toward the northeast at a gradient of approxim.:;ely 0.005-foot <br /> per foot. <br /> i <br /> fr TABLE 3 <br /> Chemical Analysis of Soil Samples <br /> Concentrations in W,illigrams per 100gram mglkg(ppm) <br /> Sample Date Sample Depth <br /> Sampled fFeetlROE= Toluene Ethvlbe r_ D pBb TPHc <br /> 11— MW 2 03f28/91 . 5 0.013 0.018 <0.005 0.02 <0.005 <0.005 «.5 <br /> MW-3 .08/28/91 10 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.5 <br /> A1,2 DI,, :Dethane <br /> bEth�•lene dribromide. <br /> Y-. <br /> ` `'Total petroleum hydrocarbons. _ <br /> .. PHIOQLSP <br /> an ME IMMID <br />