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C A M B R I A <br /> i' <br /> August 3, 1999 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> P O Box 388 <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - Second Quarter 1999 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> Incident # 98996222 <br /> SAP Code 136186 <br /> Dear Mr Knoll <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> groundwater monitoring and sampling at the referenced site (Plates I and 2) This report was <br /> prepared to meet reporting requirements issued by the Regional Water Quality Control Board, <br /> Central 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-lA, MW-2A, and MW-3A on June 1, <br /> 1999 Samples were transported to Sequoia Analytical of San Carlos, California for <br /> chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> data and prepared a groundwater contour map (Plate 2) Groundwater flow is to the <br /> northeast at an approximate hydraulic gradient of 0 002 <br /> Oakland CA <br /> Sonoma CA • MTBE was detected only in Wells MW-1 A and MW-2A at concentrations of 2,300 and <br /> Portland OR <br /> S e a t t l e WA 462 ppb, respectively Methanol was not detected in any wells A chemical <br /> concentration map was prepared and is presented on Plate 2 <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> P``seTkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />