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RECEMEDD <br /> C A M B R I A APR 282005 <br /> i EN MONWNT HEALTH <br /> PEHWISER VICES <br /> April 26, 2005 <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 2005 <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 2005 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 and laboratory analytical data Cambria prepared a <br /> site vicinity/well survey map (Figure 1), and a groundwater contour/chemical concentration map <br /> (Figure 2) Groundwater elevation data from BF-1 appears to be anomalous and was not used <br /> this quarter for preparing the groundwater contour map Blaine's report, which includes the <br /> laboratory report, is included as Appendix A Sampling was coordinated with sampling activities <br /> conducted at the Chevron service station located at 3775 Tracy Boulevard Available <br /> groundwater monitoring data and analytical results for the Chevron station are included as <br /> Appendix B <br /> REMEDIATION HISTORY <br /> Periodic groundwater extraction (GWE) using a vacuum truck occurred from February 7, 2000 to <br /> September 23, 2003 During this period a total of 206,501 gallons of groundwater were <br /> removed Respective mass removals of total petroleum hydrocarbons as gasoline, benzene, and <br /> MTBE during GWE totaled 5 45, 0 102, and 515 pounds <br /> Cambria <br /> Environmental <br /> #hnology,Inc <br /> 270 Perkins Street <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />