Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPFigure H.5 shows WMA 9 in 1968, with an active open storage area visible adjacent to WMA 9’sboundary with WMA 6 and WMA 7.Figure H.6 shows WMA 9 in 1977. A cleared area in the southeastern portion of WMA 9 wasconnected to the SDA area via an access road.Figure H.7 shows WMA 9 in 1984. By this time the SDA was covered; a road providing accessfrom the SDA to the southern portion of WMA 9 was present.Figure H.8 shows WMA 9 in 1995. The Drum Cell facility is in place, and the hardstand areas tothe north have been changed to match their present configuration. To the south, the access roadfrom the SDA was present.Figure H.9 shows WMA 9 in 2007. The SDA has been capped.H.4 Known and Suspected ReleasesThere are no known or suspected significant releases that originated within WMA 9. The DrumCell is expected to contain only low levels of residual radioactivity, if any. There may have beencontaminated soil releases as part of the NDA Interceptor Trench work. Surface soils may havebeen contaminated by dust during the placement of wastes in the NDA (WMA 7) and SDA(WMA 8).H.5 Existing DataExisting data sets for this area include:• In 1982 static direct exposure readings were collected across the WVDP premises(WVNSCO 1982). Only a very small portion of WMA 9 was covered by thesemeasurements on a 10-m grid. Figure H.10 shows these results color-coded by theexposure readings encountered, with the data overlain on a 1977 aerial photograph. Thedata suggest a slight impact along the railway line. The impacts likely extend into WMA9.Rev. 1 H-3