ArkNavReport_TOC_Acronyms_ExecSummary.doc

Annual incremental net benefits would be 98 million

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Annual incremental net benefits would be $9.8 million with Alternative E compared to Alternative B. These annual incremental net benefits are composed of $8.8 million from the Flow Management Component and $1.0 million from the 12-foot Channel Deepening Component. xxx
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xxxi
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xxxii
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Impacts/Mitigation: Mitigation measures will be implemented by the USACE to eliminate or reduce the impact of adverse impacts as defined in 40 CFR 1508.20. Biological Resources: Mitigation would be conducted for adverse impacts associated with implementing the proposed action. Mitigation for terrestrial and aquatic impacts would consist of a combination of avoidance, minimization, and compensation. The mitigation has been developed in coordination with the USFWS, Arkansas Game and Fish Commission (AGFC), and the Oklahoma Department of Wildlife and Conservation (ODWC). The terrestrial habitat mitigation plan has been thoroughly evaluated. The mitigation plan provides for significant further study of habitat to be used to adapt mitigation features in conjunction with close interagency coordination. Mitigation would be associated with: Terrestrial habitat loss associated with the disposal of dredged material; Aquatic resources impacts and habitat loss associated with dredging and dredged material disposal; Aquatic habitat loss associated with raising and extending dikes and revetments; and Federal threatened and endangered species. Cultural Resources: USACE has determined that Feasibility Study-related activities may have a minor effect upon properties potentially eligible for inclusion in the National Register of Historic Places (NRHP), and has consulted with the Arkansas State Historic Preservation Officer (SHPO), the Oklahoma SHPO, and the Oklahoma Archaeological Survey (OAS). USACE and the Arkansas SHPO agree that subsequent to completion of the NEPA documentation, Programmatic Agreements (PA) shall be implemented to satisfy the USACE’s Section 106 responsibility for all individual aspects of the Feasibility Study. A PA will be prepared and implemented by the Little Rock USACE for the identification, evaluation and treatment of cultural resources adversely affected by the Proposed Action on the MKARNS in Arkansas. The PA is reproduced in Appendix D of this Environmental Impact Statement (EIS). Implementation of the PA will serve as mitigation and as such will reduce the level of potential impact to cultural resources to below the significance threshold. Significant cultural resources are not expected to be discovered since most of the channel areas that will be subject to dredging have previously been dredged. Tulsa USACE, the Oklahoma SHPO, and the OAS will coordinate on a case by case basis and that will serve as mitigation in Oklahoma.
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