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CAMBRIA < <br /> January 31, 2001 <br /> � Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report — Fourth Quarter 2000 <br /> Shell-branded Service Station <br /> 2494 East Fremont Street <br /> Stockton, California <br /> SAP Code 136141 <br /> Incident No 98996181 <br /> SJCPHS Site 506171 <br /> Dear Mr Infurna <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equiva <br /> Services LLC in accordance with quarterly reporting guidelines issued by the Central Valley <br /> Regional Water Quality Control Board and San Joaquin County Public Health Services <br /> FOURTH QUARTER 2000 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled all site wells <br /> and prepared a summary table of field gauging data and gasoline constituents Cambria <br /> compiled the additional laboratory analyses (Table 1), prepared a site vicinity map (Figure 1), <br /> and prepared a groundwater contour/chemical concentration map (Figure 2) Blaine's report, <br /> presenting the laboratory report, is included as Appendix A <br /> ANTICIPATED FIRST QUARTER 2001 ACTIVITIES <br /> Blaine will gauge and sample the site wells according to the existing sampling schedule and will <br /> tabulate the data Cambria will prepare a groundwater monitoring report <br /> Oakland, C A CONCLUSIONS AND RECOMMENDATIONS <br /> San Ramon, CA <br /> Sonoma C A The concentration of gasoline constituents detected in groundwater this quarter are within <br /> Cambr€a the historical norm for this site Cambria will continue to monitor groundwater analytical <br /> Environmental data for this site to evaluate the need for further investigation If future groundwater <br /> Technology,Inc analytical data indicate further investigation is warranted, we will make recommendations <br /> 41 accordingly <br /> Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)93S-4850 <br /> Fax(707)935-6649 <br />