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This report presents the efforts of the sediment sampling analysis, existing conditions, planning, design, and environmental analysis for the dredging project at Onondaga Lake - Onondaga Creek Inner Harbor. The sponsor is the New York State Canal Corporation. The design includes deepening the Inner Harbor channel and a portion of the terminal slip area to a depth of 10 feet below Low Water Datum (LWD) and at a bottom width of 60 feet. The design also includes the rehabilitation of Upland Disposal Site UDS 5-19. The Upland Disposal Site will be used to hold dredging from the proposed Onondaga Creek Inner Harbor project. The Inner Harbor area extends from the New York State Canal Corporation Barge Canal Terminal on Onondaga Creek to the deeper water depths of Onondaga Lake.
The U.S. Army Corps of Engineers, Buffalo District has assessed the environmental impacts of this project and has determined a finding of no significant impact (FONSI). The selected Syracuse Inner Harbor dredging plan would allow the New York State Canal Corporation to dredge the Syracuse Inner Harbor Terminal area, New York. The proposed project would involve the removal of approximately 60,000 cubic yards of dredged material from the Inner Harbor Terminal area and the associated disposal of the dredge spoils in an adjacent Confined Disposal Facility (CDF) UDS.
Some of the nation's estuaries, lakes and other water bodies contain contaminated sediments that can adversely affect fish and wildlife and may then find their way into people's diets. Dredging is one of the few options available for attempting to clean up contaminated sediments, but it can uncover and re-suspend buried contaminants, creating additional exposures for wildlife and people. At the request of Congress, EPA asked the National Research Council (NRC) to evaluate dredging as a cleanup technique. The book finds that, based on a review of available evidence, dredging's ability to decrease environmental and health risks is still an open question. Analysis of pre-dredging and post-dredging at about 20 sites found a wide range of outcomes in terms of surface sediment concentrations of contaminants: some sites showed increases, some no change, and some decreases in concentrations. Evaluating the potential long-term benefits of dredging will require that the U.S. Environmental Protection Agency step up monitoring activities before, during and after individual cleanups to determine whether it is working there and what combinations of techniques are most effective.
Onondaga Lake in Syracuse, New York is a model for the analysis and management of a polluted urban lake. Sometimes referred to as "the most polluted lake in the United States", Onondaga Lake is one of only two lakes for which a federal advisory body has been set up to guide environmental remediation. The recipient of significant municipal effluent and industrial waste for more than a century, Onondaga Lake has been the focus of intensive limnological investigation and extensive remediation efforts. This book is a comprehensive presentation of the scientific knowledge about Onondaga Lake, based on research coordinated by the Upstate Freshwater Institute. Onondaga Lake: Limnology and Environmental Management of a Polluted Urban Lake is the most complete case study of a lake, and will be of interest to water quality scientists, engineers and managers, as well as environmental engineers, modelers, and policymakers.