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4 <br /> C A M B R I A <br /> September 15, 2000 <br /> Mr Jeffery Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report - Third Quarter 2000 <br /> Shell-branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> SAP Code 136143 <br /> Incident No 98996183 <br /> SJCPHS/EHD Code 1760 <br /> Dear Mr Wong <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, Environmental Health <br /> Division (SJCPHS/EHD) <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and well sampling for the third quarter of 2000 is summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured the groundwater <br /> level and collected a groundwater sample from monitoring well MW-1 on <br /> July 27, 2000 The sample was transported to Sequoia Analytical Laboratory of <br /> Morgan Hill, California for chemical analyses <br /> 0 TPHg and BTEX were not detected in the well this quarter MTBE (by EPA Method <br /> Oakland CA 8020) was reported in the groundwater sample collected from well MW-1 at a <br /> San Ramon CA concentration of 45 2 ppb and detected at a concentration of 44 1 ppb by an EPA <br /> Son o m a CA Method 8260A analysis A chemical concentration map is presented on Figure 2 <br /> Portland OR <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> OeTkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />