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<br />I' <br />I <br />I <br />I <br />I <br />I <br />i I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />thereby providing for fish spawning, wetlands, and terrestrial habitat enhancement. The selected <br />alternative should also optimize cost and minimize adverse social, economic, and environmental <br />impacts. <br /> <br />g. Scope of Study: Alternatives considered were limited to those techniques that <br />could restore and preserve aquatic areas, develop terrestrial habitat on the site, and meet the <br />objectives of the project. All project features would be constructed on land currently owned by <br />the Corps or for which the Corps has by easement. Approximately 725 acres have been identified <br />as potential areas for restoration and enhancement of aquatic and terrestrial habitat. This land is <br />known as Langdon Bend as shown on Exhibit 1 and 2. <br /> <br />Engineering and environmental studies were conducted for this project. Hydraulic and <br />floodplain analyses were completed for several pilot channel alternatives, as well as for a <br />backwater/wetland complex alternative. <br /> <br />Field reconnaissance was completed to inventory present vegetative and wildlife habitats. <br />Additional field observations should be performed during the monitoring phase following <br />construction to inventory fish and wildlife habitat and habitat utilization, These surveys would <br />be used to evaluate post-construction performance and the overall success of the proposed project. <br />Cultural resource surveys were conducted to determine the likelihood of significant cultural <br />resources are located within the project area. <br /> <br />h. Report Format: As part of the Missouri River Fish and Wildlife Mitigation <br />Project, a fact sheet was developed in 1994 to present a conceptual site development and <br />preliminary cost estimate for approval by the Missouri River Division, Corps of Engineers <br />(CEMRD). The fact sheet was approved by CEMRD in April, 1994. This DPR presents <br />refmements to the original fact sheet and is being submitted to CEMRD for approval to complete <br />final plans and specifications for the site development plan. It consists of three volumes. The <br />first volume contains the Definite Project Report, the second volume contains technical <br />engineering and environmental appendices, and the third volume contains the detailed project cost <br />estimates. <br /> <br />The study purpose, authority, problems and opportunities, goals and objectives, and study <br />scope are presented in Section 1 of this DPR. Section 2 provides the basis for selection of the <br />Langdon Bend site for mitigation development. The existing environment of the site to be <br />potentially affected by the project is described in Section 3. Section 4 details the objectives of the <br />proposed project. Design and construction considerations are discussed in Section 5, Section 6 <br />presents the alternative project plans, and Section 7 evaluates those alternatives with respect to <br />engineering, social, economic, and environmental features, Section 8 describes the selected plan <br />and provides design and construction details. The environmental effects of the selected plan are <br />described in Section 9, which also includes the Biological Assessment prepared for compliance <br />with the Endangered Species Act. <br /> <br />4 <br />