Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPof the Process Building is complicated by possible shine impacts. These data suggestsurface contamination in the northern portion of WMA 6, extending south to the OldWarehouse, and then a line of contamination likely associated with the old sewagetreatment drainage channel that runs parallel to the Rail Spur for some distance. Thesedata also indicate smaller, more localized areas of surface contamination in thesoutheastern corner of WMA 6 associated with hardstands and staging areas servicingWMA 7 and WMA 9.• In 1990 and 1991, a second static direct exposure measurement program was conductedacross the WVDP premises (WVNSCO 1992). In the case of WMA 6, this effortprovided systematic coverage of a portion of the WMA 6 area on a 10-m grid. This datacollection used different instrumentation and protocols than the 1982 study, so the resultsare not quantitatively comparable. As with the 1982 data set, interpretation of these dataaround the Process Building is complicated by the potential for shine impacts. FigureF.11 shows these results overlain on a 1995 aerial photograph. These data confirm theoriginal 1982 direct measurement program findings north of the Old Warehouse, but didnot identify the spur of contaminated soils in the old sewage treatment discharge channel,presumably because the old discharge channel had been backfilled with several feet ofclean fill.• There are very little soil sampling data for WMA 6 available within ELIMS, exceptadjacent to the Process Building along the WMA 1 boundary. Figure F.12 shows thelocations of surface samples and soil bores. With the exception of soil bore GP10208which was completed in 2008, all other sampling was done in 1993. Figure F.12 alsoshows the Cs-137 and Sr-90 results for surface samples for the locations where surfacesamples were collected. In general, activity concentrations decreased as one moves southin WMA 6; some of the samples in the north had surface soil activity concentrations thatexceeded the surface soil CG w . All three soil bores in the northern portion of WMA 6adjacent to WMA 1 had contamination present at depths greater than 1 m. The two soilbores in the middle and southern portion of WMA 6 and the soil bore adjacent to WMA12 South and WMA 2 did not. Table F.1 identifies the number of locations analyzed foreach of the 18 primary radionuclides of interest (ROI).Rev. 1 F-8