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CAMBM I L r R I } <br /> I <br /> _ II <br /> .i ! Q 7 <br /> April 15, 1998 <br /> Mr Alex Perez <br /> Shell Oil Products Company <br /> P O Box 8080 <br /> Martinez, California 94553 <br /> Re Quarterly Monitoring Report - First Quarter 1998 <br /> Shell Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> WIC #204-7884-0901 <br /> Dear Mr Perez <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) 'I his 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 /> Ground water monitoring and sampling for the first quarter 1998 are summarized below <br /> 4b Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water levels and <br /> collected ground water samples from Wells MW-1A, MW-2A, and MW-3A on February 11, <br /> 1998 Samples were transported to Sequoia Analytical of Redwood City, California for <br /> CAMBRIA chemical analysis <br /> ENVIRONMENTAL <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> TECHNOLOGY,INC data and prepared a ground water contour map (Plate 2) Ground water appears to flow <br /> 270 PERKINS STREET, northeasterly at an approximate hydraulic gradient of 0 014 <br /> PO Box 259 . MTBE was detected in Wells MW-lA through MW-3A at concentrations ranging from 4 0 <br /> SONOMA, to 4,500 ppb Methanol was detected in Well MW-2A at a concentration of 1,900 ppb A <br /> chemical concentration map was prepared and is presented on Plate 2 <br /> CA 95476 <br /> 0 935-4850 <br /> FAx (707)935-6649 <br />