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G I EC� � Cc <br /> A M B R I A JUN 2 1 2004 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES June 17, 2004 <br /> Mr Harlin Knoll <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 2004 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <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 2004 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled all site wells and <br /> prepared a summary table of field gauging data and petroleum hydrocarbon constituent <br /> concentrations Cambria prepared a site vicinity/well survey map (Figure 1), and a groundwater <br /> contour/chemical concentration map (Figure 2) Blaine's report, which includes the laboratory <br /> report, is included as Appendix A Sampling was coordinated with sampling activities conducted <br /> at the Chevron service station located at 3775 Tracy Boulevard Available groundwater <br /> monitoring data and analytical results for the Chevron station are included as Appendix B <br /> Groundwater flow direction was to the northeast this quarter, as is typical for the site Wells <br /> MW-IA, MW-3A, and BF-I contained MTBE at respective concentrations of 120, 0 64, and 2 1 <br /> parts per billion Concentrations of MTBE in MW-1A remain significantly reduced from <br /> historical concentrations in this well <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />