Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPdistribution of surface contamination, and to guide subsequent soil/sediment sampling.[required]J.9.2Surface Soil SamplingSurface soil sampling will be used to address areas inaccessible to GWS data collection, toresolve hot spots identified by the GWS data, and to evaluate the presence, absence, and/or extentof surface contamination above CG w requirements based on GWS results.• Wetlands. It is possible that standing water in the wetlands and/or seeps downgradientfrom WMA 2 will be present that prevent GWS data collection from those areas.Consequently, soil/sediment sampling will be required for pond footprints and for anyother areas where standing water prevents the collection of GWS data.For every area where standing water or saturated soil conditions prevent GWS datacollection, systematic soil sampling will take place. For wetland areas less than 200 m 2 insize, one sample will be collected. For areas between 200 and 1,000 m 2 in size, onesample per 200 m 2 will be collected. For areas between 1,000 and 2,500 m 2 in size, fivesamples will be collected. For areas exceeding 2,500 m 2 in size, at minimum one samplewill be collected per 500-m 2 area. One sample will be collected from each locationrepresentative of a 0-15 cm depth interval. In the case where an area has more than onelocation, locations will be selected to provide systematic coverage of the area of interest.[contingent]• Hot Spots. If GWS data indicate the presence of contamination that possibly exceeds“hot spot” (CG emc ) standards or an isolated elevated area is identified that appearsindicative of a discrete release, the location of concern will be sampled with a biasedsample. If biased samples are collected from a particular location (soil or sediment), theywill be collected from two depth intervals: 0-15 cm, and 15 cm-1 m. The 0-15 cmsamples will be analyzed for the 12 radionuclides of potential interest in addition to the18 ROI. In the case of surface soils, one down-hole gamma scan will be conducted fromeach biased location. The purpose of these samples is to resolve GWS anomalies,evaluate the appropriateness of the current ROI list, and verify the absence of additionalROI. [contingent]Rev. 1 J-10