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f <br /> Closure Objectives <br /> Closure of the site is not expected for many years. The primary cleanup goal is to reduce <br /> groundwater contamination to below 500 pg/L of benzene. The secondary cleanup goal is to <br /> further reduce benzene to below the drinking water MCL of 1.0 µg/L.,It is not Iikely that the <br /> MCL will be reached for several decades. <br /> As asymptotic benzene concentrations between 500 and 1.0 pg/L are approached in MW- ., <br /> j DIS-2, the pursuit of a significant reduction in sampling frequency, from quarterly to annual, <br /> will be triggered. <br /> When benzene concentrations have stabilized or are no longer detectable in the groundwater, <br /> and continued monitoring is no longer fruitful, Del Monte will request a closure designation 4 ` <br /> from the Central Valley Regional Water Quality Control Board. <br /> 1 <br /> Proposed Work Plan <br /> _f The intrinsic bioremediation demonstration will include specialized sampling, data <br /> evaluation, fate and transport modeling, progress reporting, a closure investigation, and the <br /> preparation of a closure report first for the AS/SVE system and later for the entire site. <br /> ` r <br /> Y <br /> I , <br /> l - <br /> it <br /> I <br /> 1 , <br /> sF010030991.DOC ES-3 <br />