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r <br /> CAM B4RIA <br /> September 23, 2002 <br /> Ms Margaret Lagono <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, P Floor <br /> Stockton, California 95201-0388 <br /> r�� <br /> Re Groundwater Monitoring Report —Third Quarter 2002 Afe Y1a j % <br /> on- <br /> Shell-branded Service Station <br /> 1071 North Main Street <br /> Manteca, California <br /> SAP Code 135570 <br /> Incident No 98995643 <br /> SJCEHD Site Code 506313 <br /> Dear Ms Lagono <br /> On behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell), Cambria <br /> Environmental Technology, Inc (Cambna) is submitting this groundwater monitonng report in <br /> accordance with the reporting requirements of 23 CCR 2652d <br /> • THIRD QUARTER 2002 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 data and groundwater chemical analytical data <br /> Cambria summarized the analytical results for oxygenates (Table 1), prepared an area survey <br /> map (Figure 1), and prepared a groundwater contour/chemical concentration map (Figure 2) <br /> Blaine's report, presenting the laboratory report, is included as Appendix A <br /> ANTICIPATED FOURTH QUARTER 2002 ACTIVITIES <br /> Blaine will gauge and sample the site wells and tabulate the data Cambria will prepare a <br /> monitoring report <br /> Oakland, CA CONCLUSIONS AND RECOMMENDATIONS <br /> San Ramon CA <br /> So nom a CA The concentration of gasoline constituents detected in groundwater samples during this quarter's <br /> Cambriamonitoring event are consistent with the historical norm for this site <br /> Environmental <br /> Tectmology,Inc Cambria recommends reducing fuel oxygenate and lead scavenger analysis from quarterly to <br /> qw. erkins Street annually in all wells at this site Groundwater samples from all three wells at this site have been <br /> P 0 Sox 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />