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r <br /> k Irl <br /> i <br /> ' o <br /> December 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 - Fourth 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 bite <br /> (Plates 1 and 2) This report was prepared to meet quarterly reporting <br /> requirements issued by the Regional Water Quality Control Board, Central Valley <br /> Region and the San 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 /> REMOVED - VAPOR PHASE (POUNDS) <br /> 4th QUARTER 1996 CUMULATIVE <br /> 20 17,628 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the fourth quarter of 1996 are <br /> summarized below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and <br /> collected samples from nine on-site wells (Wells MW-l through MW-9) and <br /> one off-site well (Well MW-10) on November 25, 1996 Samples were <br /> transported to Crosby Laboratories Inc (CLI) of Placentia, California for <br /> chemical analysis <br /> Enviros, Inc (Enviros) evaluated water-level measurement data and <br /> prepared a ground water contour map (Plate 2) Ground water appears to <br /> flow from a localized ground water mound centered on Well MW-2 at an <br /> approximate hydraulic gradient of 0 015 <br /> Enviros, Inc 270 Perkins Street Sonoma Calrtornia Tel 707/935 4850 <br /> P 0 Box 259 95476 0259 Pax 707/935 6649 <br />