The modeling described in this report is an extension of previous fate and transport modeling for the Old Radioactive Waste Burial Ground Corrective Measures Study/Feasibility Study. The purpose of this and the previous modeling is to provide quantitative input to the screening of remedial alternatives for the CMS/FS for this site. This new modeling was undertaken to help address concerns about some of the assumptions used in the previous modeling, specifically: (1) that the remedial alternative effectiveness was being underpredicted due to the way the vadose zone transport was modeled, and (2) that the allowing of leaching of constituents before the current cover system was in place would reduce the potential future effectiveness of some remedial alternatives.
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