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r <br /> r i� ti c <br /> ift t� HEALTHt <br /> September 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 /> 620 West Charter Way <br /> Stockton, California <br /> WIC #204-7524-4305 <br /> Dear Mr Granberry <br /> This Quarterly Monitoring Report describes the recently completed activities <br /> associated with ground water monitoring and sampling at the referenced site <br /> (Plate 1) This report was prepared to meet quarterly reporting requirements issued <br /> by the Regional Water Quality Control Board, Central Valley Region and the San <br /> Joaquin Environmental Health Division <br /> A soil vapor extraction (SVE) system has been operational at this site since <br /> September 17, 1992 The following table summarizes remediation performed to <br /> date <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS <br /> (TPPH) EXTRACTED - VAPOR PHASE (POUNDS) <br /> COMPOUND 3rd! QUARTER 1996 CUMULATIVE <br /> TPPH 1 17,608 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the third quarter of 1996 are <br /> summarized below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and <br /> collected sample,, from nine on-site wells (Wells MW-1 through MW-9) and <br /> one off-site well (Well MW-10) on August 22, 1996 Samples were <br /> transported to Sequoia Analytical (Sequoia) of Redwood City, California <br /> for chemical analysis _ <br /> • Enviros, Inc (Enviros)evaluated water-level measurement data and <br /> prepared a ground water contour map (Plate 2) The ground water flow <br /> direction appears to be generally southeast and a localized ground water <br /> mound appears centered on Well MW-2 The hydraulic gradient was <br /> approximately 0 03 <br /> Enviros, Inc 270 Perkins Street Sonoma California Ta!707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 7071935 6549 <br />