The U.S. Army Engineer Waterways Experiment Station (WES) has performed an evaluation of in situ capping options for sediment restoration of DDT and PCB contaminated sediments on the Palos Verdes (PV) shelf off the coast of Los Angeles, California, for Region 9 of the U.S. Environmental Protection Agency. In situ capping refers to placement of a covering or cap of clean material over an in situ deposit of contaminated sediment. ...
Primary release mechanisms for explosives from UXO are identified and conceptual models for UXO fate and transport were developed for the upland and aquatic environments. The state of development for explosives release mechanisms and process descriptor formulations for fate and transport of explosives from UXO were investigated and important data gaps were identified. The most extensive data gaps are associated with source term, which encompasses the ...
Evaluating the potential environmental consequences associated with dredging and dredged material disposal is a difficult task. Scientific advancements have made possible the collection of large amounts of complex technical information. The dredged material manager must often rely on "best professional judgement" to weigh and balance among multiple and sometimes conflicting lines of evidence to reach a decision, and each decision involves a finite level ...
Bedded sediments serve as sinks for many contaminants. Deposition of contaminants into the sediment begins a series of processes that may cycle contaminants back into the water column creating potentially adverse ecological impacts on aquatic biota. Sorption processes influence the mobility of contaminants from the sediment. Sorption is a general term referring to chemical binding that may be both reversible and irreversible. Desorption quantifies the reversibility of contaminants and is ...
The microstructure and mechnical properties of delta processed (DP) 718 alloy have been investigated. Results were compared with those of the conventionally processed IN718 and super Waspaloys. The tensile properties of the three alloys were comparable. Low cycle fatigue properties of DP718 were superior to those of conventionally processed alloys. The bar stock properties of DP718 were comparable to those of the conventionally processed Inconel 718.
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