Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPCSAP data collection will be used to determine the contamination status of surface soils in thefootprints of areas that may be used for Phase 1 construction and remediation activities. Datacollection in these areas will consist of the following:• A logged GWS of the area in question will be conducted consistent with the protocolsdescribed in Section 11. If the GWS identifies elevated areas, biased sampling will takeplace targeting the highest GWS levels. Two samples will be collected from eachlocation, one representative of the 0- to 15-cm-depth interval and one representative ofthe 15 cm to 1 m of exposed soils. Samples will be submitted for analyses of all 18 ROIsplus the additional 12 potential ROIs.• Systematic surface soil samples will be collected consistent with the protocols describedin Sections 6.10 and 10. A minimum of five sample locations will be selected for eacharea. If areas are larger than 2,000 m 2 , a triangular grid spacing of 20 m will be used.Two samples will be collected from each location, one representative of the 0- to 15-cmdepthinterval and one representative of the 15 cm to 1 m of exposed soils. Samples willbe submitted for analyses of all 18 ROIs. Consistent with Section 6.11, soil sampling atdepths greater than 1 m will take place if there are reasons to suspect that contaminationmay be present at depth or if surface sampling encounters contamination that potentiallyextends to depths greater than 1 m.Characterization of surface and subsurface soils beneath hardstands may be deferred until afterhardstands are removed as part of Phase 1 DP activities.6.11 Establish Site-Specific Performance for On-Site and Field-Based Analytical MethodsCSAP data collection will use a variety of on-site and field-based data collection methods. Acomponent of CSAP data collection will be to establish site-specific performance for thesemethods to ensure data of sufficient quality to satisfy decision-making requirements. Examples offield-based and on-site methods include various gamma walkover NaI detectors, down-hole NaIdetectors, detectors for conducting ex situ core scans, and rapid-turn on-site methods for Cs-137and Sr-90 soil sample analyses.Rev. 1 45