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Title: Long-term impact of dredged material at two open-water sites : Lake Erie and Elliott Bay; evaluative summary
Authors: Dredging Operations Technical Support Program (U.S.)
Tatem, Henry E.
Keywords: Dredged material
Dredging spoil
Lake Erie
Ashtabula Harbor
Elliot Bay
Puget Sound
Washington (State)
Waste disposal sites
Environmental effects
Environmental impact analysis
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: Dredged material disposal sites in Lake Erie and Elliott Bay were studied 1n 1975-1976. This report describes results of studies conducted at these locations in 1979-1980, 3 or 4 years after the disposal events. The Lake Erie study area included two control and three disposal sites, sampled once in 1979. Disposal sites contained more gravel and sand compared to control areas. Numerous macrofaunal and meiofaunal animals were found at all of the sites. In general, control sites contained more macrofaunal animals and species while the disposal sites were richer in meiofauna. Substrate type and variety, which was influenced by the disposal events, determined which animals were found where. None of the sites were devoid of animals and there was no indication that sediment contaminants affected benthic communities at the disposal sites. There were no differences in mercury or cadmium concentrations in sediment samples from the various sites. Samples taken at the Elliott Bay disposal site revealed that the disposal mound, created in 1975-1976, was still present and had stabilized physically and chemically. The mound area contained more animals than the surrounding bottom areas. Bivalves and polychaetes were the dominant animals found at the disposal site. The numbers of these animals at the site increased from 1976 to 1979-1980. Sediment at the center of the disposal site contained polychlorinated biphenyls (PCB); however, other areas of Elliott Bay, removed from the dredged material mound, also contained PCB at concentrations similar to those observed at the site. Some animals taken from the disposal mound contained PCB at levels slightly higher than sediment levels which were in the 2.0- to 3.0-ppm range.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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