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may. fr y <br /> October 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 - Third 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 (SJCPHS) <br />• QuarterIy Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the third 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 August 23, 1996 Additionally, <br /> Blaine measured ground water levels from VEW-1 and VEW-2 on September 5, <br /> 1996 During well gauging, Well VEW-2 was determined to be dry, theretore <br /> groundwater samples were only collected from Well VEW-1 Samples were <br /> transported to Sequoia Analytical (Sequoia) in Redwood City, CaIifoinia fot Y <br /> chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> ground water contourlbenzene concentration map (Plate 2) The ground water flow <br /> direction was calculated to be toward the east at an approximate hydraulic gradient <br /> of 00015 <br /> • Ground water samples collected from Wells MW-1 were ND for TPPH, BTEX, <br /> and MTBE compounds Wells MW-2, MW-3, and VEW-I contained TPPH <br /> concentrations ranging from ND to 56,000 ppb, benzene concentrations ranging <br /> from 0 85 to 5500 ppb, and MTBE concentrations ranging trom ND to 93 ppb A <br /> ground water contour/benzene concentration map is presented on Plate 2 <br /> Enviros, Inc 270 Perkins Street Sonoma California Ter 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6649 <br />