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CAMBRIA W] -,�' <br /> DEC 0 12001 <br /> ENVIRONMEN I ,-It,iLl H November 24, 2003 <br /> Ms Lon Duncan RERW/SEHVICES <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report - Third Quarter 2003 <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> SAP Code 136149 <br /> Incident No 98996189 <br /> SJCEHD Site Code 1223 <br /> Dear Ms Duncan <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 26524 <br /> •� THIRD QUARTER 2003 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled the site wells and <br /> prepared a summary table of field gauging data and petroleum hydrocarbon and methyl tertiary <br /> butyl ether concentrations Blaine's report, presenting the laboratory report, is included as <br /> Appendix A <br /> Cambria prepared a site vicinity/well survey map (Figure 1) and a groundwater contour/chemical <br /> concentration map (Figure 2) In addition, Cambria prepared a summary table of groundwater <br /> analytical data for fuel oxygenates and lead scavengers (Table 1) and a tetrachloroethene (PCE) <br /> concentration map(Figure 3) <br /> In a letter dated August 12, 2003, San Joaquin County Environmental Health Department <br /> Oakland, CA (S C.EM) denied Cambria s request to discontinue gauging and monitoring wells MW-6 <br /> San Ramon CA through MW-I1 and also requested that additional work be completed As requested in this <br /> Sonoma, CA letter, groundwater samples were analyzed for PCE, 1,2-dichloroethane, and ethylene dibromide <br /> Cambria <br /> this quarter <br /> Environmental <br /> Technology, Inc The laboratory noted again this quarter that the total petroleum hydrocarbons as gasoline (TPHg) <br /> OeTkins Street reported for wells MW-6 and MW-8 through MW-I I do not match the laboratory's gasoline <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />