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anticipated within the active river channel or backwaters. Although significant impacts to raptors will not occur, avoidance of andlor replacement of cottonwood trees (preferred roost and perch sites) will be incorporated into construction plans. For those listed species identified by the Fish and wildlife service that may be potentially affected by the project, a Biological Data Report and Biological Assessment will be prepared and coordinated with that agency to determine potential impacts and mitigation. There will not be any impact to threatened or endangered species if the project is not implemented. Cultural Resources. A file search of archeological and historical records was conducted for the study area by the Colorado Historical Society's Office of Archeology and Historic Preservation (9190). No properties listed on the National Register of Historic Places or other archeological or historical sites were identified. An archeological field investigation of the study area was completed in August 1990 and revealed no surface indications of prehistoric or historic sites. The study area is considered to have low potential for the occurrence of cultural resources due to previous levee and road construction. A copy of the survey report and recommendations will be forwarded to the state Historic Preservation Officer for comment in accordance with 36 CFR 800.4(a). Land Use Chanqes. The current and past use of the project site and adjacent areas primarily consist of residential with some light industrial use. The construction of the proposed levee will facilitate the further development of a trail system for recreation, and increased foot and vehicular traffic will occur along the right bank of the river. This traffic would be related to recreational uses in the future. Local planning efforts are underway to reroute current through traffic to the north of the Riverside residential area. Increased recreational access along this reach of the river and Riverside Park are viewed as beneficial impacts resulting indirectly from project construction. The project is compatible with the City of Grand Junction's development plans for the area. The Riverside residential area is nearly completely developed. The light industrial zoned area within the study reach is not cost effective to protect at this time due to lack of sufficient development. Therefore, project impacts on land use in these areas would be minimal. If the project is not constructed, there will be minor deviations to the proposed recreational corridor along the river, but it is unlikely that the city would completely abandon current development plans. water Oualitv. Water quality in the Colorado River is dependent on flow. When surface runoff is low, the river flow is primarily discharged ground water, and concentrations of metals and inorganics leached from soils is high. During high flow periods when the river flow is primarily surface water contribution, the concentration of metals and inorganics is low, and the concentration of organics and suspended solids is high. A-4 . . .