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rr ' <br /> n <br /> i <br /> October 10, 1996 <br /> Mr. R. Jeff Granberry <br /> Shell Oil.Products Company <br /> P 4 Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - Third Quarter 1996 <br /> Response to SJCPHS Letter Dated August 14, 199( <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) and to respond to SJCPHS correspondence dated August 14, 1996 <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 <br /> Current soil vapor extraction system operation utilizing activated carbon was terminated on <br /> August 21, 1996 The following table summarizes remediation performed to date <br /> Total Purgeable Petroleum Hydrocarbons Removed <br /> (pounds) <br /> LIQUID PHASE VAPOR PHASE CUMULATIVE <br /> 37 1 3277 3314 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and Sampling for the third quarter of 1996 are summarized <br /> below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from Wells MW-1 through MW-5, RW-1, and RW-2 on August 23, 1996 <br /> Blaine measured ground water levels and collected samples from Wells VEW-1, <br /> VEW-3, and VEW-4 on September 5, 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 flow is northeasterly to easterly <br /> at an approximate hydraulic gradient of 0 01 <br />• <br /> Enviros, Inc 270 Perkins Street Sonoma California Tet 707!935 4850 <br /> P 0 Box 259 95476 0259 Fax 7071935 6649 <br />