Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP• Samples will be submitted for an analysis of all 18 ROI.• Regression analyses will be used to develop a relationship between sample results anddetector responses. In particular, gross activity responses per picocurie per gram will beestimated. These responses will be used in conjunction with background data sets toestimate the minimum detectable Cs-137 activity concentrations (i.e., the activityconcentrations that can be reliably differentiated from background conditions) for eachdetector type.• If the minimum detectable activity concentrations for the FIDLER are below the CG wrequirements for Cs-137, then only a FIDLER will be used for the WVDP premise-widegamma scans. If the minimum detectable activity concentrations for the FIDLER areabove CG w requirements for Cs-137 but the minimum detectable activity concentrationsfor an alternate detector (e.g., 2 in. × 2 in. or 3 in. × 3 in.) are below, then an alternativedetector will also be deployed in addition to the FIDLER as part of WVDP premise-wideGWS.All surface soil sampling locations will have a static FIDLER reading collected from anunobstructed height of 15 cm above the location prior to sampling. Static FIDLER readings willbe recorded in a fashion that allows them to be paired with the analytical results associated withthe sampled location. These paired results will be preserved and reviewed as work progresses toallow monitoring of FIDLER performance and determination of field MDC values for theFIDLER.Additional GWS-related quality assurance/quality control (QA/QC) requirements related toperformance are described in Sections 11 and 14.6.11.2 Down-Hole and Ex Situ Core ScansDown-hole scans and/or ex situ core scans will be used as part of CSAP soil-coring activities todetermine the vertical distribution of contamination in the subsurface. Down-hole scans are thepreferred method; however, site conditions may at times preclude the collection of down-holegross activity scans for the entire length of soil cores. In these instances, ex situ core scans mayRev. 1 48