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C A M B R I A <br /> S E P o 8 2003 <br /> September 4, 2003 <br /> ENVIRuI1i��IENT HEALTH p <br /> Ms. Lori Duncan PERMIT/SERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re: Groundwater Monitoring Report—Second Quarter 2003 <br /> Former Texaco Service Station <br /> 440 West Charter Way <br /> Stockton, California <br /> SAP Code 121258 <br /> Incident No. 88870583 <br /> SJCEHD Site Code: 1055 <br /> Dear Ms. Duncan: <br /> Cambria Environmental Technology, Inc. (Cambria) 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 /> SECOND QUARTER 2003 ACTIVITIES <br /> Blaine Tech Services, Inc. (Blaine) of San Jose, California gauged and sampled the site wells and <br /> prepared a summary table of field gauging data and petroleum hydrocarbon and methyl tertiary <br /> butyl ether concentrations. Blaine's report, presenting the laboratory report, is included as <br /> Appendix A. <br /> Cambria prepared a summary table of additional groundwater analytical data (Table 1), a site <br /> vicinity/well survey map (Figure 1), a groundwater contour/chemical concentration map for the <br /> shallow groundwater zone (Figure 2) and groundwater elevation/chemical concentration maps <br /> for the two deeper water-bearing zones (Figures 3 and 4). Sampling at the subject site was <br /> coordinated with sampling at the Chevron service station (508 West Charter Way) and the former <br /> Arco service station (441 West Charter Way). Groundwater elevations from the two deeper <br /> Oakland, CA water-bearing zones at the former Arco station were used in contouring the deeper zone maps <br /> San Ramon, CA (Figures 3 and 4). Laboratory analytical and groundwater elevation data from the two <br /> S o n o m a, C A coordinated sites is included as Appendix B. <br /> Cambria <br /> Environmental <br /> Technology,Inc. <br /> Perkins Slreet <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />