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1 <br /> environ. <br /> May 28, 1996 <br /> Mr. R. ,teff Granberry <br /> Shell Oil Products Company <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - Second Quarter 1996 <br /> Shell Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> WIC#204-7524-3505 <br /> Dear Mr Granberry <br /> This Quarterly Monitoring Report describes the recently completed activities associated <br /> with ground water monitoring and sampling at the referenced site (Plates 1 and 2) This <br /> report was prepared to meet quarterly reporting guidelines issued by the Regional Water <br /> Quality Control Board, Central Valley Region and San Joaquin County Public Health <br /> Services <br /> Quarterly Monitoring & Sampling Summary <br /> • Ground water monitoring and well sampling for the second quarter of 1996 are <br /> summarized below <br /> o Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water <br /> levels in Wells MW-2 through MW-5 and RW-1A and collected ground water samples <br /> from Wells MW-2 through MW-4 on April 24, 1996 The samples were transported to <br /> Sequoia Analytical of Redwood City, California for chemical analysis <br /> + Enviros, Inc (Enviros)evaluated water-level measurement data and prepared a ground <br /> water contour map (Plate 2) Ground water appears to flow northwesterly at an <br /> approximate hydraulic gradient of 0 015 <br /> • Ground water samples collected from Well MW-2 contained 370 ppb TPPH and <br /> 23 ppb benzene Wells MW-3 and MW-4 were ND for TPPH and benzene A <br /> benzene concentration map was prepared and is presented on Plate 2 <br /> MTBE was present in Well MW-2 at 9 2 ppb and Well MW-4 at 3,100 ppb <br /> Enviros, Inc 270 Perkrns Street Sonoma Gahlornia Tef 707 1.935 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6649 <br />