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• <br /> March 15, 1997 <br /> Mr. Alex Perez <br /> Shell Oil Products Company <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - First Quarter 11997 <br /> C M Weber Enterprises Property <br /> 141 North El Dorado Street <br /> Stockton, California <br /> WIC #204-7524-1509 <br /> Dear Mr Perez <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 /> A ground water extraction system was in operation at the site from March 2, 1993 through <br /> September 5, 1995 Several soil vapor extraction systems have operated at the site The <br /> most recent soil vapor extraction system operation utilizing activated carbon was terminated <br /> on August 21, 1996 The following table summarizes remediation performed to date <br /> Tota: Purgeable Petroleum Hydrocarbons Red <br /> (pounds) 7" -AZ <br /> LIQUID PHASE VAPOR PHASE ATIVE <br /> 37 3277 14 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the first quarter of 1997 are summarized below <br /> o Blaine Tech Services, Inc (Blaine) measured gr nd water levels and collected <br /> ground water samples from Wells MW-1 throe h MW-5, RW-1, RW-2, and <br /> VEW-1 through VEW-4 on January 31, 1997 Samples were transported to <br /> Sequoia Analytical (Sequoia) of Redwood City, California for chemical 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 northeasterly to <br /> easterly at an approximate hydraulic gradient of 0 004 <br /> 0 All wells sampled were ND for benzene in ground water A benzene concentration <br /> map is presented on Plate 2 <br /> Cnvfro_n, Inc 270 Perkins Street Sonoma CaLfomra Tel 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 7071935 6649 <br />