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� o <br /> December 15, 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 /> C M Weber Enterprises Property <br /> 141 North El Dorado Street <br /> Stockton, California <br /> WIC #204-7524-1509 <br /> Dear Mr Granberry <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 /> Total Purgeable Petroleum Hydrocarbons Removed <br /> (pounds) <br /> LIQUID PHASE I VAPOR PHASE I CUMULATIVE <br /> 37 1 3277 3314 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the fourth quarter of 1996 are summarized <br /> below <br /> + Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> ground water samples from Wells MW-1 through MW-5, kW-1, RW-2, VEW-1, <br /> VEW-3, and VEW-4 on October 25, 1996 Samples were transported to Sequoia <br /> 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 01 <br />\ Cnvlros, Inc 270 Perkins Street Sonoma California Tel 707/935 4850 <br /> / P 0 Box 259 95476 0259 Fax 707/935 6649 <br />