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1 , <br /> GealogualTtcluticsJnc Page 4 <br /> 4`h Quarter 2004 Groundwater Monitoring Report <br /> Project No 507 2 <br /> February 22,2005 <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 collect <br /> ' 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 the movement of and insure the <br /> integrity of the samples <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 field logs are included in Appendix C <br /> ' 1.3 Laboratory Analyses <br /> The groundwater samples collected on December 29, 2004, were delivered to Sherwood Labs <br /> Corporation, Department of Health Services Certification No 1400, of Hilmar, California, <br /> for analysis <br /> Sherwood Labs analyzed the groundwater samples for <br /> • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX)by EPA method 8020 <br /> ' • Total Petroleum Hydrocarbons as Gasoline (TPH-G)by EPA method 5030/8015 <br /> • MTBE by EPA Method 8020 <br /> ' The results and detection limits for the above analyses are lasted in Table 3 of Appendix A <br /> whale the lab analytical results are presented in Appendix B <br /> As required under AB2886, the laboratory and groundwater elevation data were submitted <br /> electronically to GeoTracker on January 31 & February 3, 2005 - confirmation numbers <br />' 2336845159 &4399078190 <br />' 2.0 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analyses indicate the following <br />' • Wells MW-1, MW-2 and MW-3 remain free of detectable contamination <br /> a MW-4, MW-5 and MW-9 have significant BTEX and TPH-G contamination <br /> • MW-6 could not be sampled as it was under water <br />' • MW-8 has minor TPH-G and/or BTEX contamination <br /> • Water table well MW-7 did not contain BTEX or TPH-G concentrations above the <br /> laboratory reporting limits but it did contain 3 9 [ug/l MTBE The well has intermittently <br />