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CAMBRIA RE <br /> JUL 2 1 Z003 <br /> tNVIRl}NNitN( hLALTH July 16, 2003 <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-- First 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 /> . FIRST 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) Contour maps for the two deeper water-bearing <br /> Oakland CA zones were not completed because the deep groundwater monitoring wells located at the former <br /> Sonoma CA <br /> Portland OR Arco station were gauged on February 12, 2003 while subject site wells were gauged on <br /> Seattle WA February 11, 2003 Laboratory analytical and groundwater elevation data from the two <br /> coordinated sites is included as Appendix B <br /> Cambria <br /> Environmental <br /> Technology, Inc During the review of this quarter's monitoring data, we discovered an elevation survey error for <br /> �` <br /> prkins Street fiwells MW-4 and MW-7 We had the surveyor x the error and reissue his survey report <br /> P O"Box 259 <br /> Sonoma CA 95476 <br /> Tel(7o7)935-4850 <br /> Fax(707)935-6649 <br />