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C A M B R I A <br /> S F P 3 0 2004 <br /> ENVf R u SeIli ptember 27N20Q4 <br /> Mr Jeff Wong <br /> PERU 1/,)L13'4CES <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—Third Quarter 2004 <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 /> THIRD QUARTER 2004 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, Califorma gauged and sampled all site wells and <br /> prepared a summary table of field gauging and laboratory analytical data Cambna 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 /> ANTICIPATED FOURTH QUARTER 2004 ACTIVITIES <br /> Because the site wells have not contained detectable concentrations of di-isopropyl ether(DIPE), <br /> ethyl tert-butyl ether (ETBE) or tert-amyl methyl ether (TAME), Cambria recommended that <br /> these analyses be performed on an annual basis during the third quarter Pending approval from <br /> Cambna <br /> Environmental the San Joaquin County Environmental Health Department, Blaine will gauge and sample the site <br /> Technology,Inc wells according to the modified sampling schedule and tabulate the data Cambna will prepare a <br /> groundwater monitoring report <br /> *PerkinsStTeet <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />