Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPAPPENDIX GWMA 7 PRE-REMEDIATION DATA COLLECTIONG.1 BackgroundWaste Management Area 7 (WMA 7) is approximately 8 acres in size and contains the NDA andancillary structures (see Figures G.1 and G.2 for maps). The NDA was operated by NFS underlicense from the NRC for disposal of solid radioactive waste exceeding 200 mrem/h from fuelreprocessing operations.The NDA is divisible into three distinct areas (Figure G.3): (1) the NFS Waste Disposal Area,which is a U-shaped area containing Deep Disposal Holes and Shallow Special Holes; (2) theWVDP Disposal Trenches and Caissons; and (3) the area occupied by the Interceptor Trenchproject.Other structures and facilities include the Liquid Pretreatment System, the NDA Hardstand, anInactive Plant Water Line, a Leachate Transfer Line, a Former Lagoon located beneath the formerInterim Waste Storage Facility floor slab, a Groundwater Barrier Wall, and a GeomembraneCover.Descriptions of the various features of the NDA follow, and are taken from the Phase 1 DP,Section 3.1.2:NFS Deep Disposal Holes. Approximately 100 NFS Deep Disposal Holes are located in theeastern portion of the U-shaped NFS Waste Disposal Area.About 6,600 cubic feet of leached cladding from reprocessed fuel, also known as hulls, are buriedin these holes. The hulls were contained in 30-gallon steel drums stacked three abreast in theholes. Three of these drums contain irradiated, un-reprocessed fuel with damaged cladding fromthe N-Reactor at the Hanford Site. The Deep Disposal Holes also contain LLW generated duringfuel reprocessing.Most of these holes are 2.7 feet by 6.5 feet by 50 to 70 feet deep.Rev. 1 G-1