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en viroso <br /> 52 <br /> A <br /> A 1 1 <br /> April 12, 1996 t' " <br /> Mr. R. Jeff Granberry <br /> Shell Oil Products Company <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - First Quarter 1996 <br /> Shell Service Station <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> WIC #204-7524-2408 <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 (PIates 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 <br /> Quarterly Monitoring & SampIing Summary <br /> Ground water monitoring and sampling for the first quarter of 1996 are summarized below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from Wells MW-1 through MW-4 on February 28, 1996 Samples were <br /> transported to National Environmental Testing, Inc (NET) in Santa Rosa, <br /> California for chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> ground water contour/benzene concentration map (Plate 2) <br /> • Ground water samples collected from Well MW-1, MW-3, and MW-4 were ND for <br /> TPPH and BTEX compounds Well MW-2 was ND for TPPH and contained 0 5 <br /> ppb benzene A ground water contourlbenzene concentration map is presented on <br /> Plate 2 <br />