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An investigation was conducted on the environmental effects of open water dredged material disposal at the Eatons Neck Disposal Site in central Long Island Sound, New York. However, because of local political and public opposition to the dredging project, the field investigation was terminated after Phase I, a 12-month baseline survey of the disposal site and surrounding area. Phase I data, therefore, were used to describe environmental conditions at the Eatons Neck Disposal Site as they were four years after cessation of disposal operations. Dredged material, building rubble, and other materials were dumped at the site for about 70 years (1900 to 1971); 9,841,000 cu m of dredged sediments were placed at the site from 1954 to 1971. Results of hydrodynamic, bathymetry, and sediment studies showed no evidence of dispersion of dredged material from the site. Thus it appears that the Eatons Neck site is suitable, from a confinement standpoint, for the disposal of dredged sediments. Measured current velocities were typically
A baseline survey of macrobenthic and meiobenthic assemblages inhabiting the Eatons Neck Disposal Site and immediate vicinity of western Long Island Sound was conducted from October 1974 through June 1975. The data were used to describe the benthic assemblages of a disposal site that had received dredged material and other substances for a period of about 71 years, 1902 to 1973. No dumping had taken place at the site for about one year prior to collection of the baseline data. (Author).
The major goal of the Eatons Neck disposal site field investigation was to evaluate the effects of aquatic disposal of dredged material on organisms and water quality, including the significance of physical, chemical, and biological factors that influence the rate of disposal site recolonization by benthic animals. A comprehensive research program was planned and conducted at Eatons Neck in order to evaluate cause and effect relationships associated with the impacts of open-water disposal. This volume of the study presents the investigation of the hydraulic regime and the physical characteristics of bottom sedimentation. Acoustic-reflection profiles and mechanical analysis of core and grab samples of the bottom were used to define the sediment-type distribution of the area. Results were confirmed by penetrometer tests and bottom and profile photographs. The study concluded that there was no physical evidence of significant dispersion of dredged material from the Eatons Neck disposal site; no previously deposited material was detected outside the designated disposal area.
Seven oceanographic cruises and three sediment coring cruises, which took place between October 30, 1974 and May 29, 1975, were conducted in western Long Island Sound to assess the baseline water column and sediment properties near the Eatons Neck disposal site.