Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPA 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 4 will also be analyzed for the additional radionuclides that were identified.Table D.2 summarizes the required sample numbers and the estimated number of contingencysamples for WMA 4.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. Based on these screening data, contingency sampling requirements asdescribed above may be undertaken without the benefit of the remaining analyses.D.9.7Decision-Making SummaryA summary of decision-making based on the WMA 4 data is as follows:• If portions of WMA 4 are too wet to conduct a GWS, systematic surface soil samplinglocations will be conducted to characterize those areas.• If GWS indicate anomalies are present, biased samples will be selected to target thoseanomalies.• If biased sample results for the 15 cm-1 m depth interval indicate contamination aboveCG requirements, an additional sample from that location representing the depth interval1-2 m will be collected and this process repeated until contamination is verticallybounded.• The WMA 4 surface soil initial CSM as contained in Figure D.14 will be adjusted basedon GWS results. These adjustments may affect systematic sample number requirements.• If GWS results do not indicate likely surface soil CG w requirement exceedances, fivelocations with the highest GWS results will be selected for sampling.Rev. 1 D-13