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i _ C3 <br /> January 30, 1997 <br /> Mr. R Jeff Granberry <br /> Shell Oil Products Company <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - Fourth Quarter 1996 <br /> Response to December 20, 1996 SJCPHS Letter <br /> Shell Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> WIC #204-7525-0104 <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 requirements issued by the Regional Water <br /> Quality Control Board, Central Valley Region and San Joaquin County Public Health <br /> Services (SJCPHS) <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the fourth quarter of 1996 are summarized <br /> below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from Wells MW-1 through MW-3 on November 26, 1996 During well <br /> gauging, Well VEW-2 was determined to be dry Samples were transported to <br /> Sequoia Analytical (Sequoia) in Redwood City, California for chemical analysis <br /> • Enviros, Inc (Environ) evaluated water-level measurement data and prepared a <br /> ground water contour/benzene concentration map (Plate 2) The ground water flow <br /> direction was calculated to be toward the southeast at an approximate hydraulic <br /> gradient of 0 0009 <br /> • Ground water samples collected from Wells MW-I and MW-2 were ND for TPPH, <br /> BTEX, and MTBE compounds Well MW-3 contained 19,000 ppb TPPH, 420 <br /> ppb bencene and<500 ppb MTBE A ground water contouribenzene concentration <br /> map is presented on Plate 2 <br /> Enviros, Inc 270 Perkins Street Sonoma Cahfornia Tel 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 7071935 6649 <br />