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fo rca(Tecfmtcs Inc Pa e 3 <br /> Geob <br /> Groundwate, Monitonng Report <br /> Project No 507 2 <br /> March 30,2001 <br />' All non-disposable sampling equipment was decontaminated using a hot water washer and <br /> detergent before and between uses Disposable gloves were used by the technician to <br />' collect all samples and were changed with each sample collection <br /> A chain of custody document, listing all samples collected, accompanied the samples from <br /> field to laboratory, thereby providing a means to track their movement and insure their <br /> i <br /> integrity <br />' All water purged from each monitoring well and not used as a sample was placed in a 55 <br /> gallon DOT approved container These drums were properly labeled and will be stored on <br />' site until their proper disposition can be arranged <br /> Groundwater monitoring held logs are included in Appendix C <br /> 1.3 Laboratory Analyses <br /> The groundwater samples collected on March 12, 2001, were delivered to Sherwood Lab <br /> (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br /> Sherwood analyzed the eight-groundwater samples <br /> G Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by EPA method 602 <br /> G Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> Additional samples were sent to Entech Analytical from Sherwood Labs for the analysis of <br /> p Y Y <br /> a MTBE, DIPE, ETBE, TAME and TBA by EPA method 8260 <br /> The results and detection limits for the above analyses are listed in Table 2 of Appendix A <br /> while the lab analytical results are presented in Appendix B <br /> 20 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analyses indicate the following <br /> o Wells MW-1, MW-2 and MW-3 continue to be free of detectable contamination <br /> a MW-4, MW-5 and MW-9 have significant BTEX and TPH-G contamination <br />' s MW-6 and MW-8 have slight BTEX and moderate TPH-G contamination <br /> • Figures 4 and 6 indicate an inverse relationship between groundwater elevation and <br /> contarninant concentrations in wells MW-9 and MW-6 In Figure 5, the inverse trend <br />' was consistent for well MW-5 for the first four monitoring events, but since the January <br /> 2001 event the relationship has been parallel <br /> 1 <br />