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r r <br /> C A M B R I A <br /> December 31, 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 - Fourth Quarter 1998 <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> WIC #204-7524-4305 <br /> Dear Mr Rowe <br /> This Quarterly Monitoring Report describes the recently completed ground water monitoring <br /> and sampling activities at the referenced site (Plates I and 2) Cambria Environmental <br /> Technology, Inc (Cambria) prepared this report to meet quarterly reporting requirements <br /> issued by the Central Valley Regional Water Quality Control Board and San Joaquin County <br /> Public Health Services, 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 fourth quarter of 1998 are summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water <br /> Oakland CA levels and collected samples from Wells MW-1 through MW-10 on November 9, <br /> Sonoma CA <br /> Portland OR 1998 Samples were transported to Sequoia Analytical Laboratory Redwood City, <br /> Seattle WA California for chemical analysis <br /> Cambria <br /> Environmental * Cambria evaluated water-level measurement data and prepared a ground water contour <br /> Technology, Inc map (Plate 2) Ground water flow direction varies across the site The approximate <br /> A&70 Perkins Street hydraulic gradient ranges from 0 01 to 0 05 <br /> O Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />