Fundamentals of Capping Contaminated Dredged Material

by F. Douglas Jr. Shields, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,
R. L. Montgomery, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Dredging and Dredged Material Disposal

Abstract:

Contaminated dredged material disposed in subaqueous sites may be chemically and biologically isolated by covering or capping with a layer of clean material. The capping concept is simple; however, effective implementation of the concept requires solution of some challenging operational problems. Dredge plant selected for excavation of contaminated sediments should be compatible with other project components and should minimize suspension of sediment at the dredging site and dilution of the sediment with water. Transport and placement methods for both contaminated and cap materials should allow for precise placement with minimal resuspension in the water column and bottom disturbance. Dredged material used for capping must be denser than the underlying contaminated material and not significantly erodible under conditions likely to occur at the site. Accurate, precise navigation and positioning are required for cap construction and monitoring.

Subject Headings: Dredged materials | Pollution | Water pollution | Construction materials | Waste sites | Suspended sediment | Site investigation

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