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C A M B R I A <br /> i <br /> September 30, 1998 <br /> Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> P O Box 388 <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - Third Quarter 1998 <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> WIC 4204-7524-4305 <br /> Dear Mr Rowe <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates I and 2) This report <br /> was prepared to meet quarterly reporting requirements issued by the Regional Water Quality <br /> Control Board, Central Valley Region and San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS-EHD) <br />• A soil vapor extraction (SVE) system operated at this site from September 1992 to <br /> November 1996 The following table summarizes soil and ground water remediation <br /> performed to date by SVE <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS (TPPH) <br /> REMOVED - VAPOR PHASE <br /> COMPOUND CUMULATIVE <br /> TPPH 17,628 pounds <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the third quarter of 1998 are summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water <br /> Oakland CA <br /> Sonoma CA levels and collected samples from Wells MW-1 through MW-10 on August 11, 1998 <br /> Portland OR Samples were transported to Sequoia Analytical Laboratory Redwood City, California <br /> Seattle WA for chemical analysis <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> 0270 Perkins Street <br /> 0 Bax 259 <br /> Sonoma CA 95476 <br /> Tel (707)935-4850 <br /> Fax(707)935-6b49 <br />