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CAM BRIA <br /> i <br /> January 11, 2005 <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report—Third Quarter 2004, and <br /> Sample Reduction Request <br /> Former Texaco-branded Service Station/ARCO <br /> 440 West Charter Way Stockton, CaliforniSSG p%,I) <br /> SAP Code 121258 <br /> Incident No 88870583 <br /> SJCEHD Site Code 1055 <br /> Dear Ms Duncan Q <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 26524 <br /> • THIRD QUARTER 2004 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 and laboratory analytical data Blaine's report, <br /> presenting the laboratory report, is included as Appendix A <br /> Cambria prepared a site vicinity/well survey map (Figure 1) and groundwater contour/chenucal <br /> concentration maps for the shallow groundwater zone (Figure 2) and for the two deeper water- <br /> bearing zones (Figures 3 and 4) Groundwater sampling at the subject site was coordinated with <br /> sampling at the Chevron service station (508 West Charter Way) and the former Arco service <br /> station (441 West Charter Way) Laboratory analytical and groundwater elevation data from the <br /> two adjacent sites is included as Appendix B <br /> FOURTH QUARTER 2004 ACTIVITIES <br /> Cambria submitted a Site Investigation Report, Site Conceptual Model and Work Plan on <br /> cambna October 18, 2004 documenting the cone penetration testing work that occurred between August <br /> Environmental <br /> Technology,inc 30 and September 1,2004 <br /> *PerkinsStreet <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />