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water and sampled for TPH and volatile organic compounds (VOC) by EPA methods 8015 and <br /> 624 All sampling equipment was decontaminated pnor to each sampling event using the three <br /> bucket wash system to minimize the potential for cross-contamination Procedures used for <br /> water sampling are presented in Appendix C <br /> ,h <br /> Results indicated well MW4 contained 36 mg/l TPH, the highest concentration measured at the <br /> site Well MW5 contained 25 mg/l TPH and downgradientwell MW3R contained 17 mg/1 <br /> r TPH Benzene was detected in each of the four groundwater: samples, with concentrations of <br /> up to 3 8 mg/1 The distribution of benzene in groundwater is similar to the TPH distribution <br /> ;f <br /> trend Figure 5 depicts the distribution of benzene as indicated by the data Table 2 summarizes <br /> the groundwater sampling data Appendix E contains the laboratory' data with chain of custody <br /> and method detection limit J <br /> TABLE 2 <br /> f <br /> OC <br /> Summary of Water Sampling Results (mg/1) <br /> Sampled November 20, 1992 <br /> i <br /> Sample 1[D Benzene Toluene Ethylbenzene Xylene TPH <br /> MW3R 1 0 34 0 270 -.52 17 <br /> MW4 3.8 32 1 8 11 36 <br /> MWS <br /> 27 46 043 ", 63 25 <br /> 1. MW6 0 008 00072 01 042 24 <br /> TPH - Total Petroleum Hydrocarbon - xi <br /> ND - Not Detected <br /> Note Sample MW6 contained 0 049 mg1l methylene chloride and 0 079 mg1l 2-butanone <br /> Sample MW4 contained 0 24 mg1l 1,2-dichloroethane, and sample MW3 contained <br /> '0 58 mg1l 2-butanone <br /> k <br /> Page 8 <br />