Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPscans will be employed in a manner that captures readings and coordinates digitally. Otherwise,direct readings will be taken at a density of one reading per 1 m 2 with the results recorded in fieldnotebooks.The purpose of these scans is to document the contamination status of the transfer trench uponcompletion of planned Phase 1 activities.7.3 Removed Infrastructure Footprint Contamination StatusA number of Phase 1 activities will result in the removal of concrete pads, hardstands, and thelike outside the footprint of the WMA 1 and WMA 2 deep excavations. In each of these cases, thepresence of this infrastructure would have precluded thorough characterization of underlying soilsby the CSAP data collection prior to infrastructure removal.• In some cases, this infrastructure will exist in areas where there is known contaminationat depths greater than 1 m. At these locations, the area will not be a candidate for Phase 1FSS data collection, even if there is not a reason to believe surface soils exposed byinfrastructure removal are contaminated above surface soil CG levels. In these cases, thepurpose of remedial action survey data collection after infrastructure removal is todocument the contamination status of the exposed soils for Phase 2 planning purposes.• In other cases, the exposed soils themselves may clearly pose surface soil CG concerns.At these locations, DOE may choose to remove contaminated soils as part of Phase 1activities until surface soil CG standards have been achieved. In these cases, the purposeof remedial action surveys is to support the removal of contaminated soils and to indicatewhen surface soil CG standards have likely been achieved.• Finally, there may be cases in which there is no evidence of subsurface contamination atdepths greater than 1 m, and the exposed soils resulting from infrastructure removallikely meet surface soil CG requirements. At these locations, the purpose of the remedialaction survey data collection is to document the contamination status of the exposed soilsin preparation for Phase 1 FSS data collection, should DOE choose to perform Phase 1FSS activities.Rev. 1 58