This document describes the activities performed during the benchscale treatability study and associated investigations regarding the assessment of soil washing at SWMU B-20 at CSSA. The primary purpose of this study is to obtain sufficient data to assess the applicability of soil washing (density treatment) to remediate lead particulate metal in SWMU B-20 surface soils. The project objectives were accomplished by Brice, conducting procedures which are outlined in its final project report dated April 1998.