Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPoA variety of geotechnical field data will be collected from each core location, asnecessary and required for sheet piling/slurry wall design. In addition soil sampleswill be collected and submitted for geotechnical analyses (e.g., grain size, Atterberglimits, triaxial strength, etc.) as required by sheet piling/slurry wall design.[required]• Additional Contingencies.oIf any 0-15 cm surface soil sample result indicates contamination impacts abovebackground levels and there was not a 15 cm-1 m sample collected from thatlocation, a 15 cm – 1 m sample will be collected from that location following theprotocols used for the original 0-15 cm surface soil sample. In addition, each soillocation will have one down-hole gamma scan conducted at the center of the locationwith static measurements taken every 15 cm. [contingent]oIf a 15 cm - 1 m sample result exceeds background levels, then an additional samplefrom a depth of 1–2 m will be collected and analyzed from that location. In addition,down-hole gamma data will be collected from the location with static measurementscollected for every 15 cm depth interval. If that sample has contamination abovebackground conditions, then the next deeper 1 m interval will be sampled andanalyzed and a down-hole gamma scan performed. This process will continue untilbackground conditions are reached. [contingent]oIf systematic subsurface sampling identified contamination that appears to extendlaterally beyond the grid boundaries in WMA 2, such as into WMA 4 or WMA 12,then the grid will be extended and additional sampling conducted until the lateralextent of contamination has been bounded. [contingent]B.9.5Drainage Feature SamplingWMA 2 contains one primary drainage feature outside the planned WMA 2 deep excavation thatruns along the WMA 2 boundary with WMA 4. For drainage features within WMA 2, the surfacesoil CG w requirements apply. Surface drainage feature sampling will be conducted to determineRev. 1 B-24