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Y <br /> ti <br /> C A M B R I A <br /> pF"I u IT i."-t�VJCEu <br /> April 15, 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 Rgport - First Quarter 1999 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> Incident #98996222 <br /> SAP #136186 <br /> Dear Mr Knoll <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates 1 and 2) This report <br /> was prepared to meet reporting requirements issued by the Regional Water Quality Control <br /> Board, Central Valley Region and San Joaquin County Public Health Services, Environmental <br /> Health Division <br /> • Monitoring & Safipling Summary <br /> Ground water monitoring and sampling for this quarter are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water levels <br /> and collected ground water samples from Wells MW-1A, MW-2A, and MW-3A on <br /> March 5, 1999 Samples were, transported to Sequoia Analytical of Redwood City, <br /> California for chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> data and prepared a ground water contour map (Plate 2) Ground water flow is to the <br /> northeast at an approximate hydraulic gradient of 0 002 <br /> Oakland CA <br /> Sono m a CA 0 MTBE was detected only in Wells MW-1A and MW-2A at concentrations of 1,600 and <br /> Portland OR <br /> Seattle WA 3,000 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 /> Operktns <br /> echnology, Inc <br /> Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> tel(707)935-4850 <br /> Fax(707)935-6649 <br />