Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP• Slurry Wall Footprint Characterization. Subsurface soil coring and scanning will takeplace following the planned impermeable slurry wall footprint along the northern andeastern portion of the WMA 1 excavation. These cores will be separated by 20 m (FigureA.23). Approximately 13 cores will be required (two of these are shared with sheet pilingfootprint characterization locations). At each core location, one core will be retrieved thatextends one meter into the Lavery Till. A down-hole scan will be conducted to the extentpossible at each location with a static measurement every 30 cm. Each core will bedivided into one meter segments.oSubsurface soil sampling, groundwater sampling, and core scanning protocols will bethe same for soil cores from the slurry wall footprints as for sheet piling footprints.[required]oA 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 andRev. 1 A-18