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CAMBRIA <br /> January 15, 2000 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Fourth Quarter 1999 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures 1 and 2) This report was prepared to <br /> meet reporting requirements issued by the Regional Water Quality Control Board, Central <br /> Valley Region and San Joaquin County Public Health Services, Environmental Health <br /> Division <br /> Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for this quarter are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater levels <br /> and collected groundwater samples from wells MW-IA through MW-3A on December 7, <br /> 1999 Samples were transported to Sequoia Analytical of Morgan Hill, California for <br /> chemical analyses <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> data and prepared a groundwater contour map (Figure 2) Groundwater flow is to the <br /> northeast at an approximate hydraulic gradient of 0 0003 <br /> Oakland CA <br /> Sonoma CA . MTBE was detected in wells MW-1 A and MW-2A at concentrations of 46,900 and 2,640 <br /> Portland OR <br /> Seattle WA ppb, respectively Benzene and TPHg were not detected in any of the wells sampled <br /> Methanol was detected in well MW-IA at a concentration of 1,970 ppb A chemical <br /> Cambria concentration map was prepared and is presented in Figure 2 <br /> Environmental <br /> Technology, Inc <br /> aPerkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />