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D <br />�• r -r r r r ! <br /> fl. <br /> I ^ <br /> June 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 - Second Quarter 1997 <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 <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 San Joaquin County Public Health Services (SJCPHS) <br /> A ground water extraction system was in operation at the site from March 2, 1993 <br /> through September 5, 1995 Several soil vapor extraction systems have operated at <br /> the site The most recent soil vapor extraction system operation utilizing activated <br /> carbon was terminated on August 21, 1996 The following table summarizes <br /> remediation perfonried to date <br /> Total Purgeable Petroleum Hydrocarbons Removed (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 second quarter of 1997 are <br /> summarized below <br /> 0 Blaine Tech Services, Inc (Blaine) measured ground water levels and <br /> collected ground water samples from Wells MW-1 through MW-5, RW-1, <br /> RW-2, and VEW-1 through VEW-4 on April 2, 1997 Samples were <br /> transported to Sequoia Analytical of Redwood City, California for chemical <br /> analysis <br /> 0 Enviros, Inc (Enviros) evaluated water-level measurement data and <br /> prepared a ground water contour map (Plate 2) Ground water appears to <br /> flow northeasterly at an approximate hydraulic gradient of 0 01 <br /> Cn ViroQ, Inc 270 Perkins Street Sonoma Callorma Tai 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 7071935 6649 <br />