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C A M B R I A <br /> February 23, 2005 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor ID <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report— Fourth Quarter 2004 FFR Z 5 2005 <br /> Shell-branded Service Station <br /> 3725 Tracy BoulevardEF,"V1 "01AIENT MLTf I <br /> Tracy, California PE,"MiT/SFRV1fCES <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 /> FOURTH 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 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) As evaluated in our Groundwater Monitoring Report - Second Quarter 2004, <br /> groundwater elevation data from BF-1 appears to be anomalous and was not used this quarter for <br /> preparing the groundwater contour map Blaine's report, which includes the laboratory report, is <br /> included as Appendix A Sampling was coordinated with sampling activities conducted at the <br /> Chevron service station located at 3775 Tracy Boulevard Available groundwater monitoring <br /> data and analytical results for the Chevron station are included as 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 /> Cambria MTBE during GWE totaled 5 45, 0 102, and 51 5 pounds <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 />