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An? ENTAL HEALTH <br /> SAN ,>>, ,u,11N COUNTY <br /> 304 E of'-ui�R AVE 3aD FL <br /> C A M B R I A STOCK-60M CA 95F -2700 <br /> February 25, 2004 <br /> Mr Michaellnfurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report-- Fourth Quarter 2003 <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 129480 <br /> Incident No 97093419 <br /> SJCE14D Site Code 505602 <br /> Dear Mr Infurna <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 2003 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged the site wells and sampled <br /> selected wells at the subject site The quarterly sampling event was coordinated with the Tosco <br /> (former BP) station located at 1403 Country Club Boulevard Blaine prepared a summary table <br /> of field gauging data and petroleum hydrocarbon concentrations for the Shell site Cambria <br /> prepared a summary table of additional groundwater analytical data (Table 1) for the subject site, <br /> a site vicinity/well survey map (Figure 1), and a groundwater contour/chemical concentration <br /> map with data from the Shell site and the Tosco site (Figure 2) Blaine's report, presenting the <br /> laboratory report for the subject site, is included as Appendix A The groundwater monitoring <br /> data and analytical results for the Tosco station are included in Appendix B <br /> The laboratory noted that the total petroleum hydrocarbons as diesel reported for wells S-1, S-2, <br /> and S-3 do not match the pattern of the laboratory's standard As discussed in previous reports, <br /> this is due to hycrocarbons in the early diesel range and may indicate the presence of aged <br /> Cambria gaoline The total petroleum hydrocarbons as gasoline in well S-3 also do not match the <br /> Environmental laboratory's standard <br /> Technology,Inc <br /> Werkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />