Abstract

The effectiveness of capping contaminated dredged material was investigated in a subaqueous depression in the Duwamish Waterway in Seattle, Washington, U.S.A. Field studies were conducted to evaluate the consolidation of the capped material as well as the movement of contaminants from the dredged material into the uncontaminated cap material. Results showed that most of the dredged material consolidation at this site occurred during the first 2 weeks following capping. Monitoring of contaminant concentrations in the capped deposit for 18 months showed no movement of contaminants from the dredged material into the capping material.

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