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CAM BR 'IA <br /> February 20, 2001 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report — Fourth Quarter 2000 <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 129480 <br /> Incident No 97093419 <br /> SJCPHS Site Code 505602 <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 requirements 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 all site wells, sampled <br /> selected wells, and prepared a summary table of field gauging data and diesel and gasoline <br /> constituents Cambria compiled the oxygenate and lead scavenger data (Table 1), prepared a <br /> site vicinity map (Figure 1), and prepared a groundwater contour/chemical concentration map <br /> (Figure 2) Blaine's report, 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 <br /> tabulate the data Cambria will prepare a groundwater monitoring report <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Oakland CA <br /> San Ramon, CA Groundwater analytical data from this quarter are consistent with previous data In addition <br /> Sonoma, CA <br /> to the existing sampling schedule, groundwater samples from well S-2 will be analyzed for <br /> Cambna methanol, ethanol, and fuel oxygenates quarterly Cambria will continue to monitor <br /> Environmental groundwater analytical data for this site to evaluate the need for further investigation If <br /> Technology,Inc future groundwater analytical data indicate further investigation is warranted, we will make <br /> O.Tkins Street recommendations accordingly <br /> PC Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />