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Benthic infauna and sediment characteristics offshore from the Columbia River, July 1993
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1995
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Description:The U.S. Army Corps of Engineers (COE), Portland District, is authorized to maintain navigational channels in the Columbia River and its estuary and entrance. Four Ocean Dredged-Material Disposal Sites (ODMDSs) off the mouth of the Columbia River have been designated by the Environmental Protection Agency to receive dredged material (Fig. 1). These sites are identified as ODMDSs A, B, E, and F and are used for disposal of materials dredged primarily from shoals at the mouth of the Columbia River, but may also receive dredged material from other areas in the lower estuary. Average annual dredged material quantities in the mouth of the Columbia River estuary range from 3 to 9 million cubic yards, with an average of 5 million cubic yards (1980-1994), with most of the material historically disposed at Sites A and B. Site F has been used little, except for disposal of material dredged during the 1989 Tongue Point Monitoring Program (Siipola et al. 1993). In 1994, ODMDSs A, B, and F were expanded to accept additional material because material disposed at the primary ocean disposal site (ODMDS B) had not dispersed, but accumulated into a mound, which came to within 48 ft of the MLLW. This temporary (5-year) spatial expansions of Sites A, B, and F were initiated by the COE, Portland District, in 1992 while searching for a long-term solution for dredged material disposal. In 1993 material dredged from the mouth of the Columbia River was deposited at expanded ODMDSs B and F.
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Rights Information:CC0 Public Domain
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