Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP• If a sediment sample indicates contamination impacts above background levels for the 15cm-1 m depth interval, an additional sample from a depth of 1-2 m will be collected andanalyzed from that location. This will be repeated, as necessary, until the vertical extentof contamination impact is bounded at that location. [contingent]J.9.5Drainage Feature SamplingFigure J.13 identifies those portions of Erdman Brook and Franks Creek where sediment CGrequirements apply. For the remaining portions of these streams within the WVDP premises aswell as other drainage features surface soil CG requirements apply. Some of these features lie inareas of WMA 12 South where contamination concerns are not significant (e.g. the far easternend of Franks Creek). There are other portions, however, where contamination impacts are likely.These include the western end of Erdman Brook and the ditches feeding Erdman Brook from thenorth and from WMA 7.• Samples representing a 0-15 cm depth interval will be collected from ditch sediments forthose ditches that have potential contamination concerns. Samples will be systematiclocated using a random start, separated by 30 m for those ditch portions that are morethan 30 m in length. [required]• If any 0-15 cm sample result indicates contamination impacts above background levels, a15 cm-1 m sample will be collected from that location following the protocols used forthe original 0-15 cm sample. [contingent]• If a sample indicates contamination impacts above background levels for the 15 cm-1 mdepth interval, an additional sample from a depth of 1-2 m will be collected and analyzedfrom that location. This will be repeated, as necessary, until the vertical extent ofcontamination impact is bounded at that location. [contingent]J.9.6Required Laboratory AnalysesAll samples will be submitted for analysis of all 18 ROI.Rev. 1 J-15