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Vacuum Extraction System Vorkplan October, 1992 <br /> Firestone Store, 480, K. El Dorado, Stockton, CA Page 8 of 8 <br /> vapor extraction wells the inlet and outlet hydrocarbon <br /> concentrations to the vapor extraction unit will be measured <br /> concurrently in the field. <br /> Records of hydrocarbon removal from the site will be recorded and <br /> I presented at the conclusion of the study. It is anticipated that <br /> the hydrocarbon concentrations into and out of the vapor extraction <br /> unit can be graphed to indicate a decreasing inlet concentration <br /> I over time. All soil and air samples will be submitted to certified <br /> laboratories under chain-of-custody protocol. Certified laboratory <br /> reports will be part of the final report prepared for the study. <br /> Confirmation Sampling <br /> At the conclusion of the project, confirmation soil samples will be <br /> taken in the approximate locations of the April, 1991 and November, <br /> 1991 soil sample locations. The soil samples will be analyzed for <br /> TPH as gas, diesel and STEX. The results of the soil samples will <br /> be included within the study report. <br /> Well Closures <br /> At the completion of the project, when confirmation soil samples <br /> have indicated that hydrocarbons are below cleanup goals, the wells <br /> at the site will be closed in-place. The closure will comprise <br /> removal of the well covers and caps, disconnecting well-heads from <br /> vacuum piping, filling each well with a bentonite cement slurry, <br /> and capping each well location with concrete. Well closure <br /> permits, as requiredt will be obtained for each well. <br /> I <br /> Ryan-Murphy Incorporated <br /> 'The Good Earth Company" <br /> i <br />