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' C,e01Jgccal7"6ua/Ac Page 4 <br /> 41'Quarter 2003 Groundwater Monitoring Report <br /> Project No 507 2 <br /> April 12, 2004 <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 1.3 Laboratory Analyses <br />' The groundwater samples collected on December 12, 2003, were delivered to Sherwood <br /> Labs Corporation, Department of Health Services Certification No 1400, of Hilmar, <br /> California, 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 listed in Table 3 of Appendix A <br /> while the lab analytical results are presented in Appendix B <br /> MAs required under AB2886, the groundwater elevation and laboratory data were submitted <br /> electronically to GeoTracker on January 29 and February 24, 2004 - confirmation numbers <br />' 1734121143 & 3261326432 <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 /> • 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 3 8 µg/l 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 /> t front of the parcel <br /> • Water table well MW-10 did not contain contaminant concentrations above the <br /> laboratory reporting limits for the seventh consecutive event The well has previously <br /> ' contained xylene at levels dust above the laboratory reporting limit of 0 3 µg/l <br />