Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPJ.8 WMA 12 South-Specific Characterization Goals• Evaluate appropriateness of the current list of ROI• Verify absence of additional ROI• Determine extent of surface contamination• Determine level and extent of sediment contamination• Identify soil waste stream characteristics• Obtain data to support Phase 2 planning• Determine contamination status of various gullies and seeps that feed Erdman Brook andFranks Creek.J.9 CSAP Pre-Remediation Data Collection and Associated Decision-MakingCSAP pre-remediation data collection will consist of a number of components described in moredetail below.J.9.1Gamma Walkover Survey DataThe purpose of performing a gamma walkover survey of the WMA 12 area is to identify the leveland extent of surface contamination. This includes both general trends in average activityconcentrations pertinent to the CG w requirement, as well as the identification of isolated, moreelevatedanomalies that might be indicative of discrete releases and/or CG emc concerns.A complete (100%) logged gamma walkover survey (GWS) will be conducted for accessibleareas within WMA 12 South including exposed soils/sediments associated with Erdman Brookand Franks Creek. Examples of areas that would not be accessible are areas where standing wateris present in wetlands or ponds. Based on the GWS results, surface soil and sediment areas withinWMA 12 South will be divided into four categories: (1) surface soils where GWS data indicatecontamination above CG w requirements; (2) surface soils where GWS data indicatecontamination, but it is not clear if contamination exceeds surface soil CG w requirement; (3)surface soils where GWS indicate impacts, but those impacts are not expected to exceed surfacesoil CG w standards; and (4) surface soils where there is no indication of impacts abovebackground conditions. The purpose of this data collection is to provide insights into the spatialRev. 1 J-9