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•CAMBRIA DD <br /> MAY30 <br /> 2003 <br /> ENVIRONMENT HEALTH May 28, 2003 <br /> PERMIT/SERVICES <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 /> Cambna 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 Monitoring- 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 laboratory <br /> analytical results These activities were coordinated with the Chevron service station located at <br /> 3775 Tracy Boulevard Cambria prepared an additional groundwater data table (Table 1), a site <br /> vicinity/well survey map (Figure 1), and a groundwater contour/chemical concentration map <br /> (Figure 2) Blaine's report, which includes the laboratory report, is included as Appendix A <br /> Available well gauging data for the Chevron station is included in Appendix B <br /> Groundwater Remedudion Periodic groundwater extraction (GWE) using a vacuum truck <br /> began February 7, 2000 Between January 14 and March 25, 2003, a total of 4,280 gallons of <br /> Oakland Ca groundwater was removed from well MW-1A Between February 25 and March 25, 2003, a total <br /> Son o m a CA of 3,482 gallons of groundwater was removed from well BF-1 A summary of the volume of <br /> Portland, OR groundwater extracted at the site and an estimate of the amount of total purgeable hydrocarbons <br /> Seattle WA as gasoline (TPHg), benzene, and methyl tertiary butyl ether (MTBE) removed is presented in <br /> Cambria Table 2 Cambria also prepared a graph (Figure 3) which is a plot of MTBE concentration in <br /> Environmental monitoring well MW-1A versus time Cumulative mass removed is also shown on the graph <br /> Oology,Inc <br /> 270 Perkins Street <br /> P Q Box 259 <br /> Sonoma CA 95476 <br /> Tel(7o7)935-4650 <br /> Fax(7o7)935-6649 <br />