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T Y <br /> T <br /> 3}L NE 4, <br /> 1 <br /> T1 I <br /> V` 05 AUS AM 10: <br /> 5S <br /> July 30, 1996 <br /> Mr. R. Jeff 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 /> 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 <br />• Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the second 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 May 16, 1996 Samples were <br /> transported to Sequoia Analytical (Sequoia) in Redwood City, California for <br /> chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> ground water elevationthenzene concentration map (Plate 2) <br /> 0 Ground water samples collected from Wells MW-1 and MW-2 were ND for TPPH, <br /> BTEX, and MTBE compounds MW-3 contained 27,000 ppb TPPH, 3,800 ppb <br /> benzene, and 1,200 ppb MTBE A ground water_ elevation/benzene concentration <br /> map is presented on Plate 2 <br /> Second Quarter Sampling <br /> Monitoring Wells MW-1 through MW-3 were sampled and analyzed for Total Purgeable <br /> Petroleum Hydrocarbons (TPPH) according to EPA Method 8015 (Modified), benzene, <br /> toluene, ethylbenzene and xylenes (BTEX) according to EPA Method 8020, and methyl- <br /> Enviros. Inc 270 Perkins Street Sonoma California Tet 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6649 <br />