Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP• Verify Absence of Additional ROI• Determine Extent of Surface Contamination• Identify the Presence/Absence of Subsurface Soil Contamination• Identify Soil Waste Stream Characteristics• Develop an Inventory of Buried Infrastructure• Obtain Data to Support Phase 2 PlanningF.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.F.9.1Buried InfrastructureThe footprint of buried infrastructure will be identified and mapped. Buried infrastructure thatmay exist or is known to exist within WMA 6 includes wastewater lines associated with the OldSewage Treatment Plant, wastewater lines associated with the new Sewage Treatment Plant,storm sewer lines, and water supply lines. [required]F.9.2Gamma Walkover Survey DataThe purpose of performing a gamma walkover survey of the WMA 6 area is to identify the leveland extent of surface contamination. This includes both general trends in average activityconcentrations pertinent to the surface soil CG w requirement, as well as the identification ofisolated, more-elevated anomalies that might be indicative of discrete releases and/or surface soilCG emc concerns.A complete (100%) logged gamma walkover survey (GWS) will be conducted for accessibleareas within WMA 6. Examples of areas that would not be accessible are areas where standingwater is present in wetlands, existing building footprints, and building pads. Based on the GWSresults, surface soil within WMA 6 will be divided into four categories: (1) surface soils whereGWS data indicate contamination above CG w requirements; (2) surface soils where GWS dataindicate contamination, 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 exceedRev. 1 F-12