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•r, i' !" �� ;gam"' �� <br /> C A M B R I A MAR 272000 <br /> ENV1PO '.fV,'i,'T1'L ­LALTH <br /> PI=RK'11T/SERVICES March 24, 2000 <br /> Mr Jeffery Wong <br /> San Joaquin County Public Health Services <br /> 304 East Webber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report - First Quarter 2000 <br /> Shell-branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> SAP Code 136143 <br /> Incident No 98996183 <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 (SJCPHS) <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 the groundwater <br /> level in and collected groundwater samples from monitoring well MW-1 on January 6, <br /> 2000 Samples were transported to Sequoia Analytical Laboratory of Morgan Hill, <br /> California for chemical analyses <br /> • Groundwater samples collected from well MW-1 contained an MTBE concentration <br /> of 16 8 ppb by EPA Method 8020, and 17 2 ppb by EPA Method 8260A TPHg and <br /> BTEX were not detected in the well this quarter A chemical concentration map is <br /> presented on Figure 2 <br /> oakIand CA <br /> So no m a CA Quarterly Sampling <br /> Portland 0R <br /> Seattle WA <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg) by <br /> Cambria EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX) and <br /> Environmental methyl tertiary butyl ether (MTBE) by EPA Method 8020 MTBE was also analyzed by <br /> Technology, Inc <br /> Oerkins Street EPA Method 8260A <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> fax(707)935-6649 <br />