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} <br /> FEB 1 9 2002 <br /> ENVIRc.1, _ 'T HEALTH February 13, 2002 <br /> PEMMI iT1L',cRVICES <br /> Mr. Sam Savig <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Re: Groundwater Monitoring Report- First Quarter 2002 <br /> And Sample Frequency Reduction Request <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, California <br /> SAP Code 135816 <br /> Incident No. 98995874 <br /> SJCEHD Site Code: 506186 <br /> Dear Mr. Savig: <br /> On behalf of Equiva Services LLC (Equiva), Cambria Environmental Technology, Inc. (Cambria) <br /> is submitting this groundwater monitoring report in accordance with the reporting requirements of <br /> 23 CCR 2652d. <br /> FIRST QUARTER 2002 ACTIVITIES <br /> Groundwater Monitoring: On January 7, 2002, Blaine Tech Services, Inc. (Blaine) of San Jose, <br /> California gauged and sampled all wells, and compiled the groundwater analytical data. Cambria <br /> prepared a well location map (Figure 1) and two groundwater elevation contour maps (Figures 2 <br /> and 3). Blaine's report,presenting the laboratory report and supporting field notes, is included as <br /> Appendix A. <br /> GROUNDWATER REMEDIATION <br /> o a k l a n d, CA Interim Groundwater Remediation: Blaine began weekly purging of onsite monitoring well <br /> San Ramon, CA MW-1 on November 10, 1998 and onsite extraction well EW-1 on March 11, 1999. This practice <br /> Sonoma, CA continued until the groundwater extraction (GWE) system was started during March 2000. <br /> Cambria <br /> Envlronmentai Groundwaier Remediation Jysiem Operation: Cambria instaiied a G-WE system at this site <br /> Technology,Inc. which began operation in March 2000 and was shut down in July 2001. Hydrocarbon and MTBE <br /> 09Tkins Street concentrations have been substantially reduced in extraction and monitoring wells at the site. The <br /> F.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)9354850 <br /> fax(707)935-6649 <br />