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' Geological Tecluucs lac. <br /> Groundwater Monitoring Report Page 4 <br /> Project No.662.2 <br /> March 24,2005 <br /> With additional analyses for new wells MW-5, MW-6 and EW-2: <br /> Total Petroleum Hydrocarbons as Diesel (TPH-D) by EPA method 8015(M) <br /> L * Oxygenated Fuel Compounds DIPE ETBE <br /> P &TAME by EPA method 8260 <br /> EDB by EPA method 8260 <br /> L • Methanol by EPA method 8015(M) <br /> Lead by method 6010B <br /> The detection limits for the above analyses are listed in Table 3 of Appendix-A while the lab <br /> analytical results are presented in Appendix B. <br /> As required under AB2886, the groundwater elevation & laboratory data were submitted <br /> electronically to GeoTracker on March 22, 2005 (confirmation # 1347357332 & <br /> 9752029240). <br /> 2.0 FINDINGS AND DISCUSSION <br /> In accordance with SJC/EHD's January 31, 2005 facsimile correspondence, the <br /> groundwater analytical protocol was modified for this event.- <br /> Existing <br /> vent:Existing wells MW-1, MW-2, MW-3, MW-104 and EW-1 were analyzed far TPH-G, BTEX, <br /> MTBE, TBA Ethanol and 1,2 DCA. For the remaining three quarters of 2005 these wells will <br /> be sampled for TPH-G, BTEX and MTBE only. The.TBA Ethanol and 1,2 DCA constituents <br /> will continue to be analyzed on an annual basis in the first quarter. <br /> New wells MW-5, MW-6 and EW-2 were analyzed for TPH-G, TPH-D, BTEX, MTBE, <br /> ETBE, DIPS, TAME, TBA; Methanol, Ethanol, EDB, Lead and 1,2 DCA. This protocol will <br /> be repeated for the 2nd quarter 2005 and then theirrotocols will match those above. Any <br /> Y � <br /> constituent detected above the laboratory reporting limit will be maintained in the quarterly <br /> j analytical scheme. <br /> The results of the groundwater sample analyses indicate the following: <br /> Li <br /> Shallow Aquifer <br /> • Well MW-1 contained the gasoline oxygenate MTBE at 460 lAg/l. This is consistent with <br /> past results. The well also contained 270 ug/1 TPH-G and 0.8 ug/1 benzene. This is the <br /> Ll first time in the investigation that these constituents were detected above the laboratory <br /> reporting limits. f <br /> • Well MW-2, which is upgradient of the former USTs, has not contained contaminant <br /> Ll _ concentrations above the laboratory detection limits for all quarterly events completed <br /> thus far in the investigation. <br />< < z <br />