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RI/FS Workplan Addendum

Thursday, September 26, 2019

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Addendum #1 outlined a targeted sampling event to delineate a tetrachloroethylene (PCE) plume in groundwater along the Pepco Benning Road Facility’s southern boundary, and specified details of the proposed monitoring well locations, construction, and sampling.

Addendum #2 described a sampling program for soils beneath and around the cooling tower concrete basins in the northwestern portion of the Pepco Benning Road Facility to define the extent of polychlorinated biphenyls (PCBs) in soils.

Addendum #3 was developed in conjunction with the three technical memos to detail the Phase II field investigation to address the remaining data gaps and uncertainties identified in the Draft RI Report (February 2016). This Addendum formed the basis for the Phase II Remedial Investigation.