Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPA select portion of the samples as described above will 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 9 will also be analyzed for the additional radionuclides that were identified.Table H.2 summarizes the required sample numbers and the estimated number of contingencysamples for WMA 9.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.H.9.6 Decision-Making SummaryA summary of decision-making based on the WMA 9 data is as follows:• The WMA 9 surface soil area classification as contained in Figure H.15 will be adjustedbased on GWS results. These adjustments may affect sample number requirements andwill affect the placement of the initial round of soil sample locations.• Depending on the outcome of the 1 st round of hardstand soil sampling, additional soilsample locations will be selected to further laterally bound contamination extent.• If any 15 cm-1 m soil interval encounters contamination above background levels,additional deeper 1 m interval soil samples will be required for that location to determinevertical extent of contamination. If additional vertical samples are required, verticalsampling will continue until background conditions are observed.H.10 ReferencesDOE 2009. Phase I Decommissioning Plan for the West Valley Demonstration Project, Rev 2,prepared by Washington Safety Management Solutions, URS Washington Division,Science Applications International Corporation, prepared for DOE, December 2009.Rev. 1 H-10