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AMBRIA <br /> October 6,2005 <br /> Ms Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Third Quarter 2005 Groundwater Monitoring Report J <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> Incident No 98996187 <br /> SJCEHD Site Code 1058124 <br /> Cambna Project No 247-0778-002 <br /> Dear Ms McCartney <br /> Cambria Environmental Technology, Inc (Cambna) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting <br /> requirements of 23 CCR 2652d <br /> THIRD QUARTER 2005 ACTIVITIES <br /> Groundwater Monitoring Blaine Tech Services, Inc (Blaine) of San Jose, California gauged all <br /> site wells, sampled selected wells, and prepared a summary table of field gauging and laboratory <br /> analytical data Cambria prepared a site vicinity and well survey map (Figure 1) and a <br /> groundwater elevation and chemical concentration map (Figure 2) Blaine's report, presenting <br /> the laboratory report and supporting field sheets, is included as Attachment A <br /> Reduced Sampling Schedule Shell implemented the reduced sampling schedule approved in San <br /> Joaquin County Environmental Health Department (SJCEHD's) May 18, 2005 letter Wells <br /> MWA, MW-3, MW-5, and MW-6 are sampled annually during the second quarter, wells MW-4 <br /> and MW-10 are sampled semi-annually during the second and fourth quarters, and wells MW-2, <br /> MW-7, MW-8, and MW-9 are sampled quarterly In addition, analyses for 1,2-dichloroethane <br /> and 1,2-dibromoethane were discontinued <br /> Additional Ethanol Analyses In addition to the regular analyses for total petroleum <br /> Cambna <br /> Environmental hydrocarbons as gasoline, benzene, toluene, ethylbenzene, xylenes, and fuel oxygenates, <br /> Technology,Inc groundwater samples from wells MW-2, MW-3, MW-4, MW-6, MW-8, and MW-9 were <br /> analyzed for ethanol These results are included in Blaine's report (Attachment A) Ethanol was <br /> 0900 Hollis Street <br /> O A not detected in any of the wells <br /> EmeTfflle CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />