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This document is intended to serve as a consistent "roadmap" for U.S. Army Corps of Engineers and U.S. Environmental Protection Agency personnel in evaluating the environmental acceptability of dredged amterial management alternatives. Specifically, its major objectives are to provide: A general technical framwork for evaluating the environmental acceptability of dredged material management, alternatives (open-water disposal, confined (diked) disposal, and beneficial uses). Additional technical guidance to augment present implementation and testing manuals for addressing the environmental acceptability of available management options for the discharge of dredged material in both ope water and confined sites. Enhanced consistency and coordination in USAC/EPA decision making in accordance with Federal environmantl statutes regulating dredged material management.
The report presents the evaluation of the economic, technical and environmental feasibility of land disposal of dredged material from San Francisco Bay and development of an economic comparison model of various dredging methods and transport modes for different combinations of alternative land and water disposal systems. Studies included costing of dredging equipment and transport modes; mapping potential land sites around the Bay; and evaluating sites in terms of the physical properties of the sediments, site operation and site constraints. (Author).
An ensemble of analytic tools is used to identify capacity expansion alternatives for the Delaware River dredged-material disposal system. Characteristics of the river and riparian area are stored and analyzed with a geographic information system. Site attractiveness maps produced with these data yield an array of potential expansion sites. The least-costly schedule for acquisition of these sites is identified with branch-and-bound enumeration. For the enumeration, the operation cost of alternative expansion plans is evaluated with a network-flow programming model of the disposal system. (Author).
This report is a guidelines manual to assist in selecting disposal alternatives for contaminated dredged material to minimize adverse environmental effects. It is directed to the small percentage of contaminated sediments that are believed to present a high potential for environmental harm, rather than the great majority of dredging projects that involve uncontaminated or slightly contaminated sediments. The contaminants and potentially nuisance substances considered in this report include: mercury, cadmium, lead, zinc, copper, nickel, chromium, arsenic, chlorinated hydrocarbons, petroleum hydrocarbons, iron, manganese, nitrogen, phosphorus, and sulfur. Individual contaminants, and in some cases groups of contaminants that behave similary, are discussed under separate headings. Many of the contaminants respond differently to physical, chemical, and biological conditions at a disposal site. The approach taken in this report is to point out the relative environmental risks of different disposal methods by identifying the possible disposal alternatives and discussing the problems associated with specific contaminants and disposal methods. Certain management practices that may be applicable to some disposal alternatives that will further reduce the environmental risk are also presented.