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r <br /> C A M B R I A <br /> April 9, 1999 <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 - First Quarter 1999 <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> Incident 498996187 <br /> SAP#136147 <br /> Dear Mr Rowe <br /> This Quarterly Monitoring Report describes the recently completed sampling activities at the <br /> referenced site (Plates 1 and 2) Cambria Environmental Technology, Inc (Cambria) <br /> prepared this report to meet quarterly reporting requirements issued by the Central Valley <br /> Regional Water Quality Control Board and San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS-EHD) <br /> iA 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 ounds <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water sampling for the first quarter of 1999 is summarized below <br /> Oakland CA . Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water <br /> Sonoma CA levels and collected samples from Wells MW-1 through MW-10 on February 17, <br /> Portland OR <br /> 5 e a t t I e WA 1999 Samples were transported to Sequoia Analytical Laboratory of Redwood City, <br /> California for chemical analysis <br /> Cambria <br /> Environmental <br /> Technology,al • A ground water contour map was not prepared this quarter because Blaine lost the <br /> water level measurement data <br /> Perkins Street <br /> Box 259 <br /> Sonoma CA 95476 <br /> Tel(7o7)935-4650 <br /> Fax(7o7)935-6649 <br />