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"06gWA,T cluucsInc Page 4 <br />' I"Quarter 2003 Groundwater Monrtormg Report <br /> Protect No 507 2 <br /> May t5,2003 <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 drams 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 /> ses <br />' The groundwater samples collected on March 18, 2003, 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 listed in Table 3 of Appendix A <br /> while the lab analytical results are presented in Appendix B <br /> As required under AB2886, the groundwater elevation and laboratory data were submitted <br /> ' electronically to GeoTracker on April 14 and 30, 2003 - confirmation numbers 4944457650 <br /> & 4899250626 <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 8 1 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 /> front of the parcel <br /> • Water table well MW-10 slid not contain contaminant concentrations above the <br /> laboratory reporting limits The well has previously contained xylene at levels dust <br /> above the laboratory reporting limit of 0 3 µg11 <br />