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GeologicaITechnicsInc Page 4 <br /> 4'h Quarter 2002 Groundwater Monitoring Report <br /> Project No 507 2 <br /> • March 7,2003 <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 20, 2002, were delivered to Sherwood <br /> Labs Corporation, Department of Health Services Certification No 1400, of Hilmar, <br /> California, for analysts <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 listed in Table 3 of Appendix A <br /> while the lab analytical results are presented in Appendix B <br />' As required under AB2886, the laboratory data were submitted electronically to GeoTracker <br /> on January 10, 2003 - confirmation number 3971070051 <br /> 1 20 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 /> • MW-4, MW-5 and MW-9 have significant BTEX and TPH-G contamination <br /> • MW-6 and MW-8 have minor TPH-G or BTEX contamination <br /> • Water table well MW-7 did not contain BTEX or TPH-G concentrations above the - - <br />' laboratory reporting limits but did contain 14 4 µg11 MTBE The well has intermittently <br /> contained MTBE since its installation in May 2001 The source of this contamination <br /> may be surface infiltration from unpaved areas and from the open ditch traversing the <br />' front of the parcel <br /> • Water table well MW-10 did not contain contaminant concentrations above the <br />' laboratory reporting limits The well has previously contained xylene at levels just <br /> above the laboratory reporting limit of 0 3 µg/l <br />