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s� Y <br /> C A M B R I A <br /> MAR 2 6 2003 March 24, 2003 <br /> 0)N <br /> Ms Lori Duncan ENVIh1lENT HEALTH <br /> 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— Fourth Quarter 2002 <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 /> . FOURTH QUARTER 2002 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), and groundwater contour/chemical concentration maps for <br /> each of the three water-bearing zones encountered at the site (Figures 2-4) Sampling was <br /> coordinated with sampling at the Chevron service station at 508 West Charter Way and the <br /> former Arco service station at 441 West Charter Way Groundwater elevations from the two <br /> deeper water-bearing zones at the former Arco station were used in contouring the deeper zone <br /> Oakland CA maps (Figures 3 and 4) Laboratory analytical and groundwater elevation data from the two <br /> San Ramon CA coordinated sites is included as Appendix B <br /> Sonoma CA <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> (1erkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />