Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP11.0 GROSS ACTIVITY SURVEYSGross gamma activity surveys are an important component of the Phase 1 CSAP data collectioneffort. An initial, site-wide gross GWS will be conducted to provide a better understanding of thecontamination status of accessible surfaces within the WVDP fence line. Gross gamma surveyswill also be used to support soil remediation activities, both as part of the large WMA 1 andWMA 2 excavations and during the removal of soils, hardstands, and building pads outside theWMA 1 and WMA 2 excavation footprints.This section describes how these surveys will be conducted. All survey data will be logged alongwith coordinate information so as to allow the preservation of results and subsequent presentationand analysis of the data collected for decision-making purposes.11.1 Surface ConditionsThe property within the WVDP fence line contains a variety of surface conditions. These include,but are not limited to, the following: vegetated soil surfaces, gravel hardstands, unpaved roads,paved roads, parking lots and sidewalks, surface impoundments, geomembrane-capped landfills,structure footprints (building slabs where buildings have been removed as well as existingstructures), marshes, and streams. Measurable radionuclide surface contamination is known toexist for portions of the WVDP premises; portions of the property are currently fenced andidentified as radiologically controlled areas because of surface soil or sediment contamination(Figure 7). Not all 165 acres of land will be accessible for the site-wide GWS. For planningpurposes it is estimated that the accessible portion of the site comprises approximately 140 acresof property. Land grubbing will be conducted as necessary to allow for access where vegetationgrowth is problematic.Areas that will not be surveyed include marshes/wetlands where soil moisture conditions orstanding water preclude GWS, the cap of the NDA, and building pads.Rev. 1 79