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CAMBRIA <br /> December 30, 1999 <br /> Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Fourth Quarter 1999 <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> SAP Code 136147 <br /> Incident No 98996187 <br /> Dear Mr Rowe <br /> This report describes the recently completed sampling activities at the referenced site <br /> (Figures 1 and 2) Cambria Environmental Technology, Inc (Cambria) prepared this report <br /> to meet quarterly reporting requirements issued by the Central Valley Regional Water Quality <br /> Control Board and San Joaquin County Public Health Services (SJCPHS) <br /> A soil vapor extraction (SVF,) system operated at this site from September 1992 to <br /> November 1996 The following table summarizes soil and groundwater remediation <br /> performed at this site <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS (TPPH) <br /> REMOVED - VAPOR PHASE <br /> COMPOUND CUMULATIVE <br /> TPPH 17,628 pounds <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and well sampling for the fourth quarter of 1999 is summarized <br /> below <br /> oak 1 a n d CA Blaine Tech Services, Inc (Blaine), of San Jose, California measured groundwater <br /> Sonoma CA levels and collected groundwater samples from monitoring wells MW-1 through <br /> Portland OR <br /> Sea 1 t I e WA MW-10 on November 5, 1999 Samples were transported to Sequoia Analytical <br /> Laboratory of Morgan Hill, California for chemical analyses <br /> Cambria <br /> Environmental . Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> Technology,Inc <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> 0 Perkms Street (Figure 2) Groundwater appears to flow radially outward beneath the site from well <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Pax(7o7)935-6649 <br />