A wide range of technologies can be used to clean up contaminated sediment and soil. For example, sediment can be removed from the environment, dewatered, and landfilled in a hazardous waste disposal facility. Alternatively, regulators can choose to keep contaminated sediment in the environment, but cover it with clean soil to keep it in place and prevent exposure.
On the Housatonic, EPA approved a number of clean-up alternatives for further evaluation that would address PCBs in river sediment, riverbank and associated floodplain. GE evaluated these alternatives and determined which made the most sense, based on evaluation criteria approved by EPA. The technologies that were evaluated were broken into three broad categories — those that addressed contaminated sediment in the river and riverbanks; those that addressed PCBs in soil in the floodplain areas, and those that addressed treatment or disposal of any removed sediments and soils.
GE’s evaluation of these clean-up alternatives is contained in a report called the Revised Corrective Measures Study, or CMS, which GE submitted to EPA in October 2010.