Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPFigure I.4 shows WMA 10 in 1966, after construction of the Nuclear Fuel Services nuclear fuelreprocessing facility. The farmsteads had been removed, and the Administration Building andassociated parking lot were present in the northern portion of WMA 10. The road that hadoriginally passed through the southeastern portion of WMA 10 had been reworked.Figure I.5 shows WMA 10 in 1968.Figure I.6 shows WMA 10 in 1977. As can be seen in this photograph, there is no visual evidenceof significant landscape alterations since the 1966 aerial photograph.Figure I.7 shows WMA 10 in 1984, after establishment of the WVDP. Trailers had been added tothe Administration Building, along with some unpaved roadways and what appears to be somesurface reworking immediately south of the Administration Building.Figure I.8 shows WMA 10 in 1995. Almost the entire surface area of WMA 10 has been affectedby site activities.Figure I.9 shows WMA 10 in 2007. There has been additional surface reworking for portions ofWMA 10 since 1995.I.4 Known and Suspected ReleasesI.4.1Cesium ProngPotentially Affected Media:Potentially Affected WMAs:surface soil, subsurface soil, sediments1, 2, 3, 4, 5, 6, 10, 12 (northern portion)In 1968, a ventilation system filter in the Process Building (in WMA 1) failed, releasingcontaminated particulate up the Process Building stack. A mixture of radionuclides was released,with Cs-137 predominant. Approximately 0.33 Ci particulate gross beta radioactivity wasreleased. The contaminated particulate was deposited on surface soils, resulting in a large area ofcontamination around the Process Building and to the north-northwest. Detectable depositsextend several miles, including beyond the WVDP premises. WMAs 1, 2, 3, 4, 5, 6, 10, and 12Rev. 1 I-4