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CAMBReA OEC 133004 <br /> SFS <br /> December 9, 2004 <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report—Third Quarter 2004 <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 129480 <br /> Incident No 97093419 <br /> SJCEHD 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 /> THIRD QUARTER 2004 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged all site wells and sampled <br /> selected wells at the subject site The quarterly sampling event was coordinated with the former <br /> BP Oil station located at 1403 Country Club Boulevard Blaine prepared a summary table of <br /> field gauging and groundwater analytical data for the Shell site Cambria prepared a site <br /> vicinity/well survey map (Figure 1) and a groundwater contour/chemical concentration map with <br /> data from the Shell site and the BP site (Figure 2) Blaine's report, presenting the laboratory <br /> report for the subject site, is included as Appendix A The groundwater monitoring data and <br /> analytical results for the BP station are included as Appendix B <br /> The laboratory noted that the total petroleum hydrocarbons as diesel (TPHd) reported for wells <br /> S-1 and S-2 are due to hydrocarbons in the early diesel range and that the TPHd reported for <br /> wells S-3 and S-4 do not match the pattern of the laboratory diesel standard <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> 00 Hollis Street <br /> Suite A <br /> Emeryville CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />