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: One alternative for cleanup of the New Bedford Harbor Superfund site is dredging the contaminated sediments and placement into an upland or intertidal confined disposal facility (CDF). The conceptual design of either facility requires an evaluation of the settling properties of the dredged material to estimate storage requirements and effluent suspended solids concentrations. Suspended solids reduction beyond gravity settling may be achieved by chemical clarification. Laboratory column tests were performed on three sediments: the composite, the hot spot, and the capping sediments. Their settling behavior was observed to be typical of other marine sediments if hydraulically dredged and placed in a CDF. The compression test data were used to develop the initial storage requirements. The zone settling velocity was found not to be a controlling factor in the storage design; therefore, zone tests were not Performed on the hot spot and capping sediments. The flocculent test indicated that the suspended solids will settle by gravity. The chemical clarification test was conducted to further reduce those suspended solids left in the effluent.

New Bedford Harbor Superfund Project, Acushnet River Estuary engineering feasibility study of dredging and dredged material disposal alternatives. Report 7, Settling and chemical clarification tests