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CAM B ? IA HEMMED <br /> MAY 0 2 9005 <br /> ENRONMENT HEALTH April 28,2005 <br /> Mr Mike Infurna PERM TISERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street,Third Floor <br /> Stockton,California 95202 <br /> Re Groundwater Monitoring Report — First Quarter 2005 <br /> Shell-branded Service Station <br /> 2494 East Fremont Street <br /> Stockton,California <br /> SAP Code 136141 <br /> Incident No 98996181 <br /> SJCEHD Site 506171 <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 /> ® 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 /> i <br /> site vicinity/sensitive receptor survey map (Figure 1), a groundwater contour/chemical <br /> concentration map for the shallow zone (Figure 2), and a groundwater contourlchemical <br /> concentration map for the deeper zone (Figure 3) Blaine's report, presenting the laboratory <br /> report, is included as Appendix A <br /> ANTICIPATED SECOND QUARTER 2005 ACTIVITIES <br /> Blaine will gauge and sample the site wells according to the existing sampling schedule and <br /> tabulate the data Cambria will prepare a groundwater monitoring report <br /> CONCLUSIONS <br /> I <br /> The groundwater analytical data for this sampling event indicate that current levels of gasoline <br /> Cambria constituents in the groundwater are generally within the historical norm for this site <br /> Environmental Groundwater flow direction in both the shallow and deeper zones was generally to the west <br /> 40hnology,Inc <br /> 270 Perkins Street <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />