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f ' <br /> k?nvIroso <br /> .lune 10, 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 - Second 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 <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 Soil <br /> vapor extraction utilizing activated carbon is currently in operation The following table <br /> summarizes remediation performed to date <br /> Total Purgeable Petroleum Hydrocarbons Removed <br /> (pounds) <br /> LIQUID PHASE I VAPOR PHASE I CUMULATIVE <br /> 37 1 3269 1 3306 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the second quarter of 1996 are summarized <br /> below <br /> ® Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from Wells RW-1, RW-2, and MW-1 through MW-5 on May 16, 1996 <br /> Samples were transported to Sequoia Analytical (Sequoia) of Redwood City, <br /> California for chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> groundwater contour map (Plate 2) Groundwater flow is northeasterly at an <br /> approximate hydraulic gradient of 0 012 <br /> i <br /> Enviros, Inc 270 Perkins Street Sonama California Tel 7071935 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6649 <br />