Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPinfrastructure that did not carry waste or wastewater, the sample will be fromsoils immediately above the line. In the case of infrastructure that did carry wasteor wastewater, the sample will be from soils immediately beneath the line.• If contamination above background conditions is encountered at any selected location,trenching will continue to depth until background conditions are observed. An additionalsample will be collected from the base of the trench to verify background conditions. Thepurpose is to vertically bound observed contamination. [contingent]• If buried infrastructure soil sampling identifies contamination impacts greater thanbackground, biased sampling will continue following the line until at least twoconsecutive locations yield soil samples below surface soil CG w requirements. Locationspacing will be based on engineering judgment, including the geometry of the line, thelevel of contamination encountered, and surface evidence of contamination. The purposeof this sampling is to bound the extent of contamination associated with buriedinfrastructure, as necessary. [contingent]C.9.6Additional ContingenciesSampling and/or GWS data may indicate that contamination exists or extends beneath surfacescurrently covered by existing structures, concrete, asphalt, or hardstands. In this case, “surfacesoil” will be defined as soil immediately beneath the cover. If sampling or GWS data indicate thatcontamination may exist beneath existing structures (e.g., existing buildings and building pads),then sampling locations will be offset along the foundation edge to determine contaminationextent. The purpose of the offset is to allow safe acquisition of data. Data collection throughbuilding pads in WMA 3 will not be required as part of this effort.C.9.7Required Laboratory AnalysesAll samples will be submitted for analysis of all 18 ROI.A select portion of the samples as described above may be analyzed for the additional12 radionuclides of potential interest. In addition, 10% of the surface soil samples submitted foranalysis will be analyzed for the 12 radionuclides of potential interest in addition to the 18 ROI. IfRev. 1 C-15