ArkNavReport_TOC_Acronyms_ExecSummary.doc

22 summary of additional disposal sitesdikes

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4.2.2 Summary of Additional Disposal Sites/Dikes & Weirs/Revetments .... 4-6 4.2.2.1 Navigation Channel Deepening - No Action Component ........... 4-6 4.2.2.2 Navigation Channel Deepening - 10, 11, and 12-foot Component ............................................................................... 4-6 4.2.3 Summary of Net Benefits of Final Channel Deepening Components By Reaches ................................................................................ 4-8 4.2.4 Summary of Benefits and Costs for 10, 11, and 12-foot Channel Depths for Entire MKARNS ................................................... 4-9 4.3 Navigation Channel Maintenance Features ........................................................ 4-12 4.3.1 Use of Active Disposal Sites, Eventual Cessation of Maintenance Dredging ............................................................................................... 4-12 4.3.2 Maintenance Dredge Disposal At Approved Sites In Original 1974 O&M Plan (No Action) .............................................................. 4-12 4.3.3 Maintenance Dredge Disposal at New Disposal Sites ......................... 4-12 4.4 Alternatives Development ................................................................................... 4-12 4.4.1 River Flow Management Features ....................................................... 4-13 4.4.2 Channel Deepening Features ............................................................... 4-13 4.4.3 Navigation Channel Maintenance Features ......................................... 4-13 4.4.4 Summary of Alternatives Evaluated .................................................... 4-13 4.4.4.1 Alternative A – No Action ............................................................ 4-14 4.4.4.2 Alternative B – Maintenance Dredging and Disposal Only...4-15 4.4.4.3 Alternative C – Maint Dredging & Disposal & Ops ................ 4-16 4.4.4.4 Alternative D – Maint Dredging & Disposal, Ops, & 11-ft ...... 4-17 4.4.4.5 Alternative E – Maint Dredging & Disposal, Ops, & 12-ft4-17 4.5 Summary of Decisions To Be Made ................................................................... 4-18 5.0 SELECTION OF NED/RECOMMENDED PLAN 5.1 Comparison of Alternative Plans ......................................................................... 5-1 5.1.1 Alternative A - No-Action Alternative ...................................................... 5-1 5.1.2 Alternative B - Navigation Channel Maintenance Only ......................... 5-2 5.1.3 Alternative C - Navigation Channel Maintenance and Operations Only Flow Management ................................................................. 5-3 5.1.4 Alternative D - Navigation Channel Maintenance, Operations Only Flow Management, and 11-foot Navigation Channel .................... 5-6 5.1.5 Alternative E - Navigation Channel Maintenance, Operations Only Flow Management, and 12-foot Navigation Channel .................... 5-8 5.2 NED/Recommended Plan .................................................................................. 5-10 5.3 Mitigation Summary ........................................................................................... 5-10 5.3.1 Biological Resources ............................................................................... 5-10 5.3.2 Long Term Monitoring and Adaptive Management ........................... 5-14 5.3.3 Threatened and Endangered Species ................................................... 5-14 iii
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5.3.4 Cultural Resources ................................................................................. 5-15 5.3.5 Features ................................................................................................... 5-16 5.3.6 Costs ........................................................................................................ 5-17 5.4 Risk & Uncertainty ............................................................................................. 5-17 5.4.1 Economic Analysis ................................................................................. 5-17 5.4.2 Hydrologic and Hydraulic Analysis ...................................................... 5-17 5.4.3 Environmental Mitigation ..................................................................... 5-18 5.4.4 Cost Estimates ....................................................................................... 5-20 5.5 Assumptions ............................................................................................. 5-20 5.5.1 Hydrology & Hydraulics ...................................................................... 5-20 5.5.2 Channel Maintenance Dredging, Operations ...................................... 5-22 5.5.3 Design ...................................................................................................... 5-23 5.6 Sensitivity ............................................................................................................. 5-23 5.7 Additional Engineering Studies Needed in PED .............................................. 5-24 6.0 PLAN IMPLEMENTATION 6.1 Authority ................................................................................................................ 6-1 6.2 EIS .......................................................................................................................... 6-1 6.3 Implementation of Mitigation .............................................................................. 6-1 6.4 Permits Required .................................................................................................. 6-1 6.5 Public & Other Agencies Views and Comments ................................................. 6-2 6.6 Other Environmental Opportunities ................................................................... 6-2 6.7 Schedule ................................................................................................................. 6-2 7.0 RECOMMENDATIONS ................................................................................................. 7-1 LIST OF FIGURES Figure 1-1 MKARNS .............................................................................................................. 1-4 Figure 1-2 Profile of the MKARNS ....................................................................................... 1-6 Figure 1-3 MKARNS Actual Tonnages ............................................................................... 1-10 Figure 2-1 Dike Notching Ceremony ................................................................................... 2-10 Figure 2-2 Notched Dike at NM 241.1 ................................................................................. 2-10 LIST OF TABLES Table 1-1 MKARNS Tonnage (1971-2004) .......................................................................... 1-10 Table 2-1 Major Federal and State Environmental Regulations Applicable to Federal Projects ............................................................................. 2-7 & 2-8 Table 3-1 Future Maintenance Dredging Requirements, Existing 9-foot channel .......... 3-10 Table 3-2 Summary of the Initial Components of the Flow Management Features ........................................................................................... 3-17 thru 3-19 Table 3-3 Description of Locks and Dams on Oklahoma Portion of Navigation System ...................................................................................... 3-23 iv
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