Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPAll samples will be submitted for analysis of all 18 ROI. No samples will require analysis of thetwelve potential radionuclides of concern.Table K.1 summarizes the number of required samples and the estimated number of contingencysamples for WMA 12 North.This sampling plan assumes that quick turn-around analyses (within 48 hours) are available forSr-90 and Cs-137 and that soil samples will be screened for Sr-90 and Cs-137 prior to beinganalyzed for the balance of the ROI. Contingency sampling requirements as described above maybe undertaken based on these screening data.K.9.5 Decision-Making SummaryA summary of decision-making based on the WMA 12 North data is as follows:• If GWS indicate anomalies are present, biased samples will be selected to target thoseanomalies.• The WMA 12 North surface soil area classification as contained in Figure K.9 will beadjusted based on GWS results. These adjustments may affect systematic sample numberrequirements.• If the GWS data identify areas likely exceeding CG w 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 GWS data indicate impacts exist but that it is unlikely that contamination exceeds CG wrequirements, five biased locations will be selected based on GWS data to verify thisconclusion.• If GWS data identify areas where contamination impacts exist but CG w compliance isunclear, at most five systematic surface soil samples will be allocated to each area toverify contamination status.Rev. 1 K-9