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I I I I I I I I I I I I I I I I I I I Chapter V - Evaluation of Alternatives Chapter V - Evaluation of Alternatives Four factors were used to evaluate the alternatives: 1) Impacts on the man-made environment, the natural environment and the existing social structure; 2) Institutional requirements for project implementation. 3) Technical considerations; and 4) Project costs. The project impacts related to man-made environment, the natural environment, and the existing social structure are common to all of the alternatives, and are described below. The technical considerations are similar for all alternatives. The costs and institutional requirements vary between alternatives and are described in detail for each alternative. The following sections describe the project's output/yield, impacts, institutional requirements and costs. Financial feasibility will be addressed for the selected alternative in Chapter VI. A. Impacts A.I Man-Made Environmental Impacts There will not be any foreseen environmental impacts to existing dwelling units, commercial facilities, or other structures in the project area, due to the developed alternatives. There are no utilities or roadways that will have to be relocated for the project. The pipe will be installed under Three City of Greeley waterlines using microtunneling to avoid any conflicts. There are no additional lands that would be inundated above the historical impoundment elevation 4959.93 (spillway crest elevation based on City of Loveland 1995 Datum). A.2 Natural Environmental Impacts Some wetlands may be impacted during the construction of the outlet works structures. It is likely that a 404 Nationwide and/or Individual Permit from the U.S. Army Corps of Engineers (US ACE) will be required for the project. There are no known endangered species at the project area, but will be investigated during the permitting phase of the project. Boyd Lake Dam Outlet System Feasibility Study 18 1f30VLE