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C A M B R I A <br /> April 11, 2000 <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 - First Quarter 2000 <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 (SVE) 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 first quarter of 2000 is summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured groundwater <br /> Oakland CA levels and collected groundwater samples from monitoring wells MW-1 through <br /> Sonoma CA MW-10 on February 22, 2000 Samples were transported to Sequoia Analytical <br /> Portland OR Laboratory of San Carlos, California for chemical analyses <br /> Seattle WA <br /> Cambna Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> Environmental measurement data and prepared a groundwater contour/chemical concentration map <br /> Technology,Inc <br /> (Figure 2) Groundwater beneath the site appears to flow radially outward from the <br /> 0 Perkins Street <br /> P 0 Bax 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4650 <br /> Fax(7o7)935-6649 <br />