Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP• For any additional buried infrastructure of potential concern that is identified, a minimumof at least one soil sample from at least one biased location will collected following theprotocols described for the main storm sewer line for each buried infrastructure lineidentified that is of potential concern. Infrastructure of potential concern is infrastructurethat either carried waste or was installed after 1968. Examples of the type of additionalburied infrastructure that might be encountered are water supply lines, gas lines, electricallines, telecommunication lines, etc. The purpose of this sampling is to evaluate thepresence of contamination associated with buried infrastructure. [contingent]• If buried infrastructure soil sampling identifies contamination impacts greater thanbackground, biased sampling will continue following the line away from the WMA 1, 3,and 5, until at least two consecutive locations yield soil samples below surface soil CG wrequirements. Location spacing will be based on engineering judgment, including thegeometry of the line, the distance from WMA 1, 3, and 5, the level of contaminationencountered, and surface evidence of contamination. The purpose of this sampling is tobound the extent of contamination associated with buried infrastructure, as necessary.[contingent]I.9.7Additional ContingenciesSampling and/or GWS data may indicate that contamination exists or extends beneath surfacescurrently covered by existing structures, concrete, asphalt, or gravel. In this case, “surface soil”will be defined as soil immediately beneath the cover. If sampling or GWS data indicate thatcontamination may exist beneath existing structures (e.g., the Administration Building, SecurityGatehouse, or hardstand areas), then sampling locations will be offset along thefoundation/hardstand edge to determine contamination extent. The purpose of the offset is toallow safe acquisition of data. Data collection through the floors of existing buildings or throughhardstands in WMA 10 will not be required as part of this effort.WMA 10 abuts up to several other areas that have the potential for subsurface soil contaminationconcern at depths greater than one meter (e.g., WMA 1). Sampling efforts associated with thoseareas may result in soil core collection that extends into WMA 10 as necessary.Rev. 1 I-15