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CAMBRIA <br /> January 20, 2005 <br /> Mr Jeff Wong <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— Fourth Quarter 2004, and <br /> Sample Reduction Request <br /> Shell-branded Service Station <br /> 2375 West Grant Line Road <br /> Tracy, California <br /> SAP Code 136187 <br /> Incident No 97471967 <br /> SJCEHD Site Code 0001473 <br /> Dear Mr Wong <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 /> Blame 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 map (Figure 1) and a groundwater contour/chemical concentration map (Figure 2) <br /> Blaine's report, which includes the laboratory report, is included as Appendix A <br /> Sampling activities were coordinated with the 7-Eleven site located at 2360 West Grant Line <br /> Road Water level data and chemical analytical data for the 7-Eleven site are included in <br /> Appendix B <br /> Due to the elevated concentration of methyl tertiary butyl ether in the sample collected from well <br /> MW-1, reporting limits were raised for all the other constituents analyzed in the sample <br /> Cambria submitted a work plan to San Joaquin County Environmental Health Department <br /> Cambria (SJCEHD) for further site assessment on November 18, 2004 Cambria received SJCEHD's <br /> Environmental December 6, 2004 work plan approval letter and has scheduled the field work for January 27 and <br /> Technology,Inc <br /> 28, 2005 <br /> Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />