Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPcontamination may exist beneath existing structures (e.g., existing buildings, building pads, orhardstand areas), then sampling locations will be offset along the foundation/hardstand edge todetermine contamination extent. The purpose of the offset is to allow safe acquisition of data.Data collection through building pads and hardstands in WMA 6 will not be required as part ofthis effort.F.9.8Required 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. If these sample results indicate the presence of the one ormore of those radionuclides at levels of potential significance, then the balance of samples fromWMA 6 will also be analyzed for the additional radionuclides that were identified.Table F.2 summarizes the required sample numbers and the estimated number of contingencysamples for WMA 6.This sampling plan assumes that quick turn-around analyses are available for Sr-90 and Cs-137and that soil samples will be screened for Sr-90 and Cs-137 prior to being analyzed for thebalance of the ROI. Contingency sampling requirements as described above may be undertakenbased on these screening data.F.9.9Decision-Making SummaryA summary of decision-making based on the WMA 6 data is as follows:• For each piece of buried infrastructure of concern that is identified, three biased locationswill be selected, excavation conducted to expose the line, and a soil sample formed fromsoils most likely contaminated. If contamination is encountered above CG requirements,sampling will continue along these lines until it is bounded.Rev. 1 F-20