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I Cl E F J U L 0 7 2003 C AM B R 1A H VIKINMENJ r PERMIT/SERVICK) July 1, 2003 Ms Lori Duncan San Joaquin County Environmental Health Department 304 E Weber Avenue, Third Floor Stockton, California 95202 Re First Quarter 2003 Groundwater Monitoring Report and Sample Frequency Reduction Request Shell-branded Service Station 6131 Pacific Avenue Stockton, California SAP Code 136149 Incident No 98996189 SJCEHD Site Code 1223 Dear Ms Duncan Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting requirements of 23 CCR 2652d �l FIRST QUARTER 2003 ACTIVITIES Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled the site wells and prepared a summary table of field gauging data and petroleum hydrocarbon and methyl tertiary butyl ether concentrations Cambria prepared a site vicinity/well survey map (Figure 1) and a groundwater contour/chemical concentration map (Figure 2) Well MW-10 was not sampled on i February 21, 2003 with the rest of the wells, because it could not be located as it had been previously paved over The well was located and gauged on March 14, 2003 and sampled on March 31, 2003 Blaine's report,presenting the laboratory report, is included as Appendix A ANTICIPATED SECOND QUARTER 2003 ACTIVITIES oak 3 a n d CA Blaine will gauge and the site wells according to the existing sampling schedule and tabulate the Sonoma CA data Cambria will prepare a groundwater monitoring report Portland OR Seattle WA SAMPLE FREQUENCY REDUCTION REQUEST Cambria Environmental Shell installed several wells south of the subject site (MW-6 through MW-11) with the Technology,Inc assumption that groundwater flow direction was towards the southeast After installing these 4Wjns Street P 0 Box 259 Sonoma CA 95476 Tel(7a7)935-485a Fax(707)935-6649