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■!� IJ <br /> / I <br /> R eU(Y V lY I! ®s <br /> September 30, 1997 <br /> '1VLz. Alex Perez <br /> Shell Oil Products Company a, <br /> rO 86x`4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - Third Quarter 1997 <br /> Shell Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> WIC #204-7524-4305 <br /> Dear Mr Perez ' <br /> F" ' <br /> This Quarterly Monitoring Report describes the recently completed activities associated <br /> r rk t �a <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, Environmental Health Division (PHS-EHD) <br /> A so4 vapor extraction (SVE) system has been operational at this site since September 17, <br /> 1992 The following table summarizes soil and ground water remediation performed to <br /> date by SVE <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS (TPPH) <br /> REMOVED - VAPOR PHASE <br /> COMPOUND CUMULATIVE <br /> s TPPH 17,628 pounds <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the third quarter of 1997 are summarized <br /> below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water <br /> levels and collected samples from nine on-site wells (Wells MW-1 through MW-9) <br /> and one off-site well (Well MW-10) on August 21, 1997 Samples were <br /> transported to Crosby Laboratories Inc (CLI) of Placentia, California for chemical <br /> analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> ground water contour map (Plate 2) Ground water appears to flow easterly to <br /> southerly at an approximate hydraulic gradient of 0 03 <br /> Enviros, Inc 270 Perkins Street Sonoma California Tel 7071935 4850 <br /> P 0 Box 259 95476 0259 Fax 7071935 6649 <br />