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. . . . dense palustrine scrub-shrub wetland accented by an abandoned gravel mine which provides open water diversity with a component of emergent marsh. There will not be any impact on the character of this wetland due to the presence of the levee. There will not be a significant change in left bank flooding during high flow events. Increasing the foundation elevations of buildings and dwellings within the Rosevale area will not impact wetlands. If the proposed levee is not constructed, the wetlands on both banks of the river will not change exclusive of those changes associated with natural plant succession and alteration caused by expected high flow events and spring runoff. Coordination with the U.S. Fish and wildlife field office in Grand Junction on 2 January 1991 revealed that the FWS does not consider the project site as valuable habitat and does not believe that any surveys, studies, or analyses of fish and wildlife issues are warranted. Noise. Existing noise levels are similar to those associated with a typical residential area. Noise may intermittently reach nuisance levels during operation of railway traffic near the project site. The major sources of noise at the project site during construction of a levee will result from the operation of heavy construction equipment and from trucks used to haul fill material. According to the FEIS, the maximum equivalent noise generated at the levee site will be expected to be less than 86 decibels on the A-weighted scale (dBA) at a distance of 50 feet from the center of activity. The noise level will be annoying to persons near any selected haulage route, but occurrences would be brief at any single location. The construction noise described in the FEIS would be similar to noise during the levee construction. The adverse effects of construction noise on Riverside residents will be minimal and short term; however, onsite workers will be required to wear hearing protection. There will not be any significant changes in ambient noise levels if the project is not constructed. Threatened or Endanqered Soecies. The reach of the Colorado River bordering the project site contains threatened and endangered aquatic species indigenous to the Colorado River drainage; i.e., the Colorado squawfish (Ptvchocheilus lucius), humpback chub (Gila cvoha), bony tail chub (Gila eleqans), and the razorback sucker (Xvrauchen texanus), a species currently proposed for Federal listing. Avian species listed as endangered, which are known to seasonally frequent and occupy the affected reach of the river, include the bald eagle (Haliaeetus leucoceohalusl and the peregrine falcon (Falco oereqrinus). One listed mamalian species, the black-footed ferret (Mustela niqrioes), probably existed in the Grand Valley historically, but has not been documented in the immediate vicinity of the proposed project. Due to the setback nature of the levee, impacts to endangered fish are not expected since actual work is not A-3