Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPFigure G.8 shows the WMA 7 area in 1977. The NDA Hardstand is visible in the southeast cornerof WMA 7 and in use. There also appears to be temporary storage along the western edge of theNDA.Figure G.9 shows the WMA 7 area in 1984. At this point in time the NDA was largely coveredand re-vegetated, with the exception of the center of the NDA. In this photograph a structure isvisible towards the north end of the NDA and activity is visible in the WVDP disposal area.Figure G.10 shows the WMA 7 area in 1995. The area is now completely re-vegetated.Figure G.11 shows the WMA 7 area in 2007 before the placement of the NDA GeomembraneCover. The SDA’s geomembrane cover is visible.G.4 Known and Suspected ReleasesG.4.1 NDA OperationsPotentially Affected Media: surface soil, subsurface soil, groundwaterPotentially Affected WMAs: 7The buried waste in the NDA is known to contain a large amount of radioactivity. It is estimatedthat the total radioactivity will be approximately 229,000 curies in 2011 (DOE 2009 Table 2-20).Surface soil contamination above background levels is likely present in the immediate vicinity ofthe NDA. This contamination would be associated with air deposition of contaminants duringNDA waste placement activities.G.4.2 NDA Hardstand SpillsPotentially Affected Media: surface soil, subsurface soil, groundwaterPotentially Affected WMAs: 7, 8The NDA Hardstand area is known to be contaminated and is currently roped off as a radiologicalcontrolled area. The source of contamination was presumably releases from containers.Rev. 1 G-7