The record of decision for the NFSS Balance of Plant and Groundwater OUs is available at the link provided in the Reports section below. A fact sheet regarding the record of decision is available at the link in the Fact Sheet/FAQs section below.
The selected remedy outlined in the record of decision for both OUs is Alternative 2, Complete Removal. The major components of the selected remedy include: removal and off-site disposal of radiological- and/or chemically contaminated soil, road bedding, and Building 401 foundation/utilities; removal and off-site disposal of impacted foundations and underlying soil, including Building 430 and 431/432, and Building 433; and, removal and off-site disposal of a chlorinated volatile organic compound soil and groundwater plume and placement of clay backfill into the excavation. FUSRAP-related material that is removed will be transported off-site for disposal at an appropriately permitted disposal facility.
Based on input received during the public comment period, the Corps of Engineers’ selected remedy for the Balance of Plant and Groundwater OUs was changed from the preferred alternative outlined in the proposed plan, which was Alternative 3, Removal with Building Decontamination. The main differences between the alternatives are the remedial strategies for building foundations (other than Building 401) and the chlorinated volatile organic compound plume. Contaminated concrete will be excavated under Alternative 2 and would have been scarified to remove contamination and left in place under Alternative 3. Clay soil be used to backfill the chlorinated volatile organic compound excavation area to ensure the protectiveness of the remedy.
A contract to remediate the Balance of Plant and Groundwater OUs is currently scheduled for award in 2023. After complete removal of the IWCS, the soils beneath the IWCS will be investigated and remediated, as necessary, using the remediation goals outlined in the record of decision for the Balance of Plant and Groundwater OUs.
Following completion of remedial activities, the site would be suitable for industrial use (i.e., protective of construction, industrial, and maintenance workers, as well as adolescent and adult trespassers). Five-year reviews will be conducted to ensure protectiveness of the remedy.
The administrative record file, which contains the documents supporting the decision-making process for the site, is available electronically at the link below.