Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPB.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 additional 12radionuclides of potential interest. In addition, ten percent of soil samples collected outside theWMA 2 excavation footprint will also be analyzed for the 12 radionculides of potential interest. Ifthese sample results indicate the presence of the one or more of those radionuclides at levels ofpotential significance, then the balance of samples from WMA 2 will also be analyzed for theadditional radionuclides that were identified.Table B.2 summarizes the required sample numbers and the estimated number of contingencysamples for WMA 2.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.B.9.9Decision-Making SummaryA summary of decision-making based on the WMA 2 data is as follows:• If GWS indicate anomalies are present, biased samples will be selected to target thoseanomalies.• If the GWS data identify areas likely exceeding CG requirements, one sample will beplaced to verify contamination and another set of surface soil samples used to laterallybound contamination. Additional locations may be selected, as necessary, to laterallybound contamination extent.• If sample results from biased or systematic surface samples for the 15 cm–1 m depthinterval indicate contamination above CG requirements, an additional sample from thatRev. 1 B-27