ArkNavReport_TOC_Acronyms_ExecSummary.doc

Formulation of alternatives alternatives were

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Formulation of Alternatives: Alternatives were developed based upon the analyses of the features and components. Alternatives, including the No Action Alternative, were developed by combining components of the three features to achieve, in varying degrees, the proposed action. Table E-5 summarizes the components used in the five alternatives selected for evaluation. xxii
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Table E-5. Components of Decision Alternatives Navigation Channel Maintenance* Flow Management Operations Only Navigation Channel Deepening 11 Ft. Navigation Channel Deepening 12 Ft. Alternative A No Action (Dredge disposal sites approved in 1974) X Alternative B Maintenance Only (New dredge disposal sites including those in- stream) X Alternative C Maintenance & Ops Only Flow Management X X Alternative D Maintenance & Ops Only Flow Management & 11 Foot Navigation Channel X X X Alternative E Maintenance & Ops Only Flow Management & 12 Foot Navigation Channel X X X * Navigation channel maintenance activities would occur in the same manner under Alternatives B, C, D, and E. The Navigation channel depth to be maintained would be 9 feet for Alternatives A, B and C, 11 feet for Alternative D, and 12 feet for Alternative E. Source: USACE 2005 As a result of comments made during the public review period of the draft EIS and feasibility report, the descriptions and definitions of Alternatives A and B have been clarified. The key purpose of the Arkansas River Navigation Study is to improve navigation efficiency in the MKARNS. The study analysis has been geographically extensive and involves many aspects of the navigation system that have been operating for decades. The MKARNS is part of an evolving ecosystem that includes a complex, intrinsically interrelated mosaic of riverine, riparian, wetland and floodplain habitats. Modifications to the MKARNS may come from engineering actions within the direct control of the Corps, or from actions or changes made outside the direct control of the Corps. All of the navigation efficiency improvements considered in the study may be implemented in compliance with existing environmental protection statutes and without additional congressional authority. Given the inherent degree of variation and complexity conditioning the natural and human-made environments in which modifications may be made, and also given the uncertainty about which changes may be made absent one of the actions proposed in the final array of alternatives, the Corps has determined that in this instance, it would best serve the purposes of the National Environmental Policy Act to also present and to evaluate what may occur if none of the proposed actions are implemented. The clarified descriptions and definitions of Alternatives A, B, C, D, and E are as follows: Alternative A – Navigation Channel Maintenance (No Action). Alternative A is based on measures that are currently in place and available for implementation with minimal additional administrative action. This alternative assumes
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