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.t <br /> CAM B R I A <br /> January 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 Report - Fourth Quarter 1998 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> WIC #204-7884-0901 <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 & Sampling 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 /> November 24, 1998 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 0 001 <br /> Oakland CA a MTBE was detected in Wells MW-I A, MW-2A, and MW-3A at concentrations of 2,100, <br /> Sonoma CA <br /> Portland OR 6 3, and 2 7 ppb, respectively Methanol was detected in Well MW-l A at a <br /> Seattle WA concentration of 1 3 ppm Methanol was ND in Wells MW-2A and MW-3A A <br /> chemical concentration map was prepared and is presented on Plate 2 <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> Jerkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4650 <br /> Fax(707)935-6649 <br />