Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPgross activity levels will have one down-hole gamma scan conducted at thecenter of the location with static measurements taken every 15 cm. Locations willbe selected so that each representative area does not overlap. The purpose is todocument CG w requirement exceedances and bound the lateral extent ofcontamination. [contingent]oIf GWS results indicate areas with surface soil contamination impacts but it isunclear whether CG w requirement exceedances are present, at most five samplinglocations will be selected that systematically cover the areas of interest. Onesample will be collected from each location representative of a 0-15 cm depthinterval. Locations will be selected to provide systematic coverage of the area ofinterest. The purpose is to resolve the question of whether CG w requirementexceedances exist for areas where GWS results are ambiguous. [contingent]oIf any 0-15 cm interval yields a sample result indicating a CG w requirementsexceedance and that sample location is not laterally bounded either by existingsampling locations with results less than CG w requirements or by GWS data thatclearly indicate contamination is not a concern, additional sampling locationswill be selected so that the contamination encountered is spatially bounded. Thepurpose is to laterally bound contamination that is above CG w requirements.[contingent]oIf there are areas present where historical WVDP activities resulted in significantreworking or cover of original soils such that GWS data collection might noteffectively identify the presence of surface soil contamination, systematicsampling will take place. For these areas, sampling locations will besystematically located on a 20 m triangular grid. Two samples will be collectedper location, one representative of the 0-15 cm interval and one representative ofthe 15cm – 1m interval. This will not apply to hardstand areas; soils beneathhardstands will be characterized after hardstands are removed. [contingent]I.9.4Subsurface Soil SamplingRev. 1 I-12