Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPRoad-Salt and Sand Shed. The Road-Salt and Sand Shed is a storage bin and a sand stall restingon asphalt pavement. It is constructed with a wooden frame covered with galvanized steel siding.This facility will be removed during work to achieve the interim end state. The slab will beremoved as part of Phase 1 decommissioning activities.LLW Rail Packaging and Staging Area. The LLW Rail Packaging and Staging Area coversapproximately 27,000 square feet east of and adjacent to the railroad tracks at the south end ofWMA 6. The area contains two eight-inch-thick reinforced concrete pads and another sectioncovered with crushed limestone. The concrete pads will be removed during Phase 1decommissioning activities.WMA 6 is known to have a significant amount of buried infrastructure in its northern portion,including wastewater lines that connected the Process Building with the Old Sewage TreatmentFacility, the New Sewage Treatment Facility, sludge ponds and equalization tanks/basin, and theWMA 2 water treatment facilities.F.2 Physical SettingThe WMA 6 area is a long, narrow waste management area that is oriented northwest tosoutheast. It is bordered by WMA 10 to the west, WMA 1 and 2 to the north, WMA 12 and 7 tothe east, and WMA 9 to the south. WMA 6 is bisected by Erdman Brook; north of the stream isthe North Plateau, and south of the stream is the South Plateau.The topography of the WMA 6 area has been significantly reworked as part of site activities,which have included the construction of several buildings, the installation of a railroad line alongthe length of WMA 6, the construction of buried infrastructure including storm sewers andsewage lines, and the construction of several holding ponds.A significant portion of WMA 6 is currently covered by hardstands, roads, the railroad bed, andconcrete pads/building foundations. The balance is grass-covered.The northern half of WMA 6 is underlain by the sand and gravel unit which overlies the LaveryTill. In general, groundwater in the sand and gravel unit flows to the northeast across the NorthRev. 1 F-3