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<br />Dredaina and Channel Narrowina. This al ternati ve combines the <br />previous two alternatives. First, the island would be removed to <br />allow the dikes to be constructed to their full length in a single <br />effort. This would provide all of i:he advantages of both plans; <br />however, the initial cost is signi:!Eicantly higher than either of <br />the other plans, and the possible adverse environmental impacts may <br />be more severe. <br /> <br />Note: possible adverse environmental ,impacts include but <br />are not limited to degradation/destruction of wetlands, <br />destruction of fish spawning ha.b,i.tat, removal of riparian <br />vegetation zones, and increased water depth and <br />velocities. <br /> <br />COST ESTIMATES <br /> <br />The following cost estimates a.re preliminary and should be <br />used for planning purposes only. They are based on the Omaha <br />District's recent construction experience in the area. Actual <br />construction costs will depend on 1tlhen and how the project is <br />completed. <br /> <br />Dredaina. <br /> <br />Item <br /> <br />Quantitv <br /> <br />Unii: <br /> <br />unit <br />Cost <br /> <br />Total <br />Cost <br /> <br />Clearing <br />Excavation <br />Contingencies <br /> <br />13.8 <br />116,600 <br /> <br />AcrE:~s. <br />CY <br /> <br />$3,000 <br />3.45 <br /> <br />$ 41,400 <br />402,270 <br />~500 <br />$510,170 <br />47,000 <br />....2.h000 <br />$583,170 <br /> <br />Construction Sub-tc)tal <br />Additional Engineering and Design (E&D) <br />Supervision and Administration (SSoA) <br />Project Total <br /> <br />Average Annual O&M (vegetation removal) <br /> <br />$4,100 <br /> <br />Section 22 - South Platte River, Merino, Colorado <br /> <br />Page "" <br />