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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 prior 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 /> Results indicated well MW4 contained 36 mg/l TPH, the highest concentration measured at the <br /> site Well MW5 contained 25 mg/1 TPH and downgradlent well MW3R contained 17 mg/1 <br /> r� <br /> 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 /> 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 <br /> TABLE 2 <br /> Summary of Water Sampling Results (mg/1) <br /> b M. <br /> Sampled November 20, 1992 <br /> Sample Til Benzene Toluene l thylbenzene Xylene TPH <br /> MW3R 1 0 34 0 270 5 2 17 <br /> MW4 3.8 32 1 8 11 36 <br /> MW5 27 46 043 63 25 <br /> MW6 0 008 00072 01 0 42 24 <br /> TPH - Total Petroleum Hydrocarbon <br /> ND - Not Detected <br /> Note Sample MW6 contained 0 049 mgll methylene chloride and 0 079 mgll 2-butanone <br /> Sample MW4 contained 0 24 mgll 1,2-dichloroethane, and sample MW3 contained <br /> 0 S$ mgll 2-butanone <br /> Page 8 <br />