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- F <br /> 9� e <br /> SEHASE I HYDE99EDLOGICI <br /> 4491!Vest Durh=Ferry Road,Tracy,Cal'sro-if.. <br /> Delta Project No.40-91-732 <br /> Page 7 <br /> w <br /> i <br /> Chemical analti/ses of the ground water from monitoring wells MW-1 and MW-2 indicated the presence of <br /> TPH as gaseAm at concentradow of 140 and 6,400 ppb, respectively. Concentrations of benzend was <br /> detected in.monitoring wells MF-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 /> .,a <br /> i <br /> 4.0 SUMMARY <br /> Wsed on the soil samples collected at 5-foot intervals at the three monitoring well locations,the site appears <br /> =i co be underlain by sandy silt with a 2-foot-thick lens of sand at approximately 3 feet below the ground <br /> surface. The water table was observed to be approximately 10 fart below the ground surface. The direction <br /> of ground water flow was calculated to be toward the northeast at a gradient of approximately 0.005-foot <br /> per foot. <br /> 5 <br /> _ 1 <br /> TABLE 3 <br /> Cl'emical Analysis of Soil Samples <br /> Concentrations in Milligrams per Kilogram mglkg(ppm) <br /> sample Date Sample Depth <br /> LOOIJLM SaMpled 0!W& Rom .adunec Ethvlbe ]FDBb <br /> MW 2 03/28/91 5 0.013 0.018 <0.005 0.02 <0.005 <0.005 <0.5 <br /> MW-3 080191 10 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.5. <br /> 21,2 Dicholoethane <br /> b6hylehe dribromide. <br /> j cToW petroleum hydrocarbons. <br /> 3 Y <br /> PH 1001.t1P <br /> Fes; <br />