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<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 />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Woodward.Clyde ConsuRants <br /> <br />6.0 <br />ESTIMATED COSTS <br /> <br />6.1 COSTS OF CONSTRUCTION <br /> <br />Construction cost estimates were developed for each of the rehabilitation options and <br />are presented in Tables 6-1 through 6-3. Unit costs were derived from construction <br />projects either recently completed, presently under construction or scheduled for <br />construction in the near future. These projects are generally located in the Colorado - <br />Wyoming area. Some typical projects include Long Pond Reservoir (Fort Collins, <br />Colorado) rehabilitation construction in 1990 where the embankment was removed and <br />replaced around the outlet and the spillway was reconstructed and the Sulphur Creek <br />Dam raise (1987-1988) in southwestern Wyoming where the embankment was raised and <br />a cutoff wall was constructed through the dam core. <br /> <br />A contingency of 30% was included in each of the cost estimates. Typically a minimum <br />of 20% is recommended; however based on the-numbers of unknowns at this stage of <br />design a 30% contingency was used for each of the different options cost estimates. <br />These additional unknowns include the internal condition of Douglas Reservoir Dam <br />and the extent of reconstruction necessary to resolve problems in the dam. Possible <br />inclement weather affects are also included in the contingency since rehabilitation <br />construction is planned to begin February 1991. Because construction is planned to <br />occur soon after filing of this feasibility report (February 1991) and to be completed <br />quickly (May 1991) no allowance was made for future costs escalation. <br /> <br />6.2 TOTAL PROJECT COST <br /> <br />Other costs included as part of the total project costs include the items and costs listed <br />in Table 6-4. Because the construction costs for rehabilitation of the spillway is the <br />same for each of the embankment rehabilitation options these costs were included as <br />part of Table 6-4. This lump sum cost for spillway construction is based on our <br />experience at Long Pond Dam. A summary comparison of the total project costs for the <br />different options is presented in Table 6-5. It should be noted that engineering design <br /> <br />22539G/DOUGLAS.DAM 12-I7-90IREPORTS3 <br /> <br />28 <br />