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w7 � <br /> r e n V Iy II ®sa <br /> ty <br /> Fl <br /> u <br /> March 30, 1997 <br /> Mr. Alex Perez <br /> Shell Oil Products Company <br /> P 4 Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - First Quarter 1997 <br /> Shell Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> WIC #204-7524-4305 <br /> Dear Mr Perez <br /> This Quarterly Monitoring Report describes the recently completed activities <br /> associated with ground water monitoring and sampling at the referenced site <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 /> 1st QUARTER 1997 CUMULATIVE <br /> 0 17,628 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the first quarter of 1997 are summarized <br /> below <br /> • Blaine ech Services, Inc (Blaine) measured ground water levels and <br /> collected samples from nine on-site wells (Wells MW-1 through MW-9) and <br /> one off-site well (Well MW-10) on February 24, 1997 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-4 at an <br /> approximate hydraulic gradient of 0 02 <br /> • Ground water samples collected from Wells MW-1 through MW-10 <br /> contained TPPH concentrations ranging from not detected (ND) to 13,000 <br /> Envlros, Inc 270 Perkins Street Sonoma cab/orma Tel 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6649 <br />