Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP2.0 OBJECTIVES AND OVERVIEWSection 1.0 identified the following four main CSAP data collection purposes: (1) pre-design datacollection, (2) remedial support, (3) post-remediation status documentation, and (4) Phase 2decision-making support. Data collection to support these four main purposes is organized intotwo distinct data collection efforts. The first is pre-remediation data collection that will take placeprior to the initiation of significant Phase 1 decommissioning activities (e.g., the WMA 1 andWMA 2 excavations). The second is remediation support data collection that will occur duringand immediately after environmental remediation in support of remediation activities. Both datacollection efforts have a set of well-defined objectives, described in more detail below, thatencompass the data needs of the four main CSAP data collection purposes.2.1 Pre-remediation Data Collection Objectives1. Evaluate Appropriateness of the Current List of ROIs. The Phase 1 DP contains a masterlist of 18 ROIs for the WVDP premises. This list may not be applicable to all areas of theWVDP premises. Data collection is required to identify area-specific subsets of this listthat would need to be addressed by any future area-specific sampling activities (e.g.,FSS). These data would be used to ensure that appropriate analytical procedures areemployed for specific areas during any follow-on data collection activities. One possibleoutcome is that the master ROI list is reduced for specific areas (i.e., one or more of the18 ROIs either are not found in the soils/sediments or are found at such low level activityconcentrations that they are inconsequential for Phase 1 decision-making).2. Verify Absence of Additional ROIs. An additional 12 potential ROIs have been tentativelyidentified based on screening analyses described in the 1996 Draft Environmental ImpactStatement (DEIS) (DOE 1996). Data collection is required to verify that these 12potential ROIs are not of any significant decision-making concern. These data would beused to determine whether the current ROI list contained in the Phase 1 DP should beexpanded.3. Explore the Possibility of Surrogate ROIs. There is a question as to whether ROI ratiosare consistent enough to allow for the use of surrogates in future data collection effortsRev. 1 3