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A Risk-Management Strategy for PCB-Contaminated Sediments
TABLE 7–3 Sediment Management Options and Associated Risks
Risk of Implementing
Sever exposure pathways
In situ management
Containment and degradation
Ex situ management
Dewatering, size separation
Treatment and disposal
Separation or destruction
The first goal of any management activity for PCB-contaminated sediments should be to identify and, where possible, control the point and nonpoint sources that have caused and will continue to cause the contamination problem. The sources include, but are not limited to, run-off from contaminated soils, combined sewer overflows, and atmospheric inputs.
Effectively responding to the contaminated sediment at a site generally requires using options that involve multiple technological and institutional components, and the evaluation, screening, and selection of these options must consider all the components, their interrelationships, and their impacts. Seven broad rules govern the analysis of management options:
All sites require a conceptual model of the system, and the interaction of the management options with the sediments and contaminants is required.
The use of mass flows can assist in developing and testing the