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IIT S FRV1.,E <br /> 03 AUG 2 f Ptd 12: 3,7gust 19, 2003 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report— Second Quarter 2003 <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 /> SECOND QUARTER 2003 ACTIVITIES <br /> Groundwater Monttortng Blaine Tech Services, Inc (Blaine) of San Jose, California gauged <br /> and sampled all site wells and prepared a summary table of field gauging data and petroleum <br /> hydrocarbon and methyl tertiary butyl ether (MTBE) concentrations Cambria prepared a <br /> summary table of additional groundwater analytical data (Table 1), a site vicinity/well survey <br /> map (Figure 1), and a groundwater contour/chemical concentration map (Figure 2) Blaine's <br /> report, which includes the laboratory report, is included as Appendix A Sampling was <br /> coordinated with sampling activities conducted at the Chevron service station located at 3775 <br /> Tracy Boulevard Available groundwater monitoring data and analytical results for the Chevron <br /> station are included as Appendix B <br /> Groundwater Remediatton Periodic groundwater extraction (GWE) using a vacuum truck <br /> o a k I a n d CA began February 7, 2000 Between April 22, 2003 and June 25, 2003, a total of 3,070 gallons of <br /> Sonoma CA <br /> P o r t I a n d OR groundwater was removed from well MW-IA Between April 22, 2003 and June 25, 2003, a <br /> Seattle WA total of 3,985 gallons of groundwater was removed from well BF-1 A summary of the volume <br /> of groundwater extracted at the site and an estimate of the amount of total petroleum <br /> Cambria <br /> Environmental hydrocarbons as gasoline (TPHg), benzene, and MTBE removed is presented in Table 2 <br /> Technology,Inc Cambria also prepared a graph (Figure 3) which is a plot of MTBE concentration in monitoring <br /> well MW-IA versus time Cumulative mass removed is also shown on the graph <br /> erkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />