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., \ lo o -'1('~ 1m w ~ '1 J J ] J J J ,I 1 1 '1 :4 OJ i .-.; .~ .) CONVEYANCE SYSTEM The conveyance system is the pumpback element of the Green Mountain Exchange Project. It is a pump and pipeline system that would pump water from Green Mountain Reservoir to Dillon Reservoir. Both. reservoirs are located on the Blue River, a tributary to the Colorado River. Green Mountain Reservoir is located 26 miles downstream of Dillon Reservoir. . The difference in water surface elevation between the two reservoirs is 1070 feet. The pipeline route would have an overall length of 140,900 feet and would follow the highway right-of-way where practical. Three pump stations would be required. Two conveyance capacities have been studied: 8000 af per month and 12,000 af per month. These represent a range of the options available. To formulate Green Mountain Exchange Project alternatives in this Study, the estimated cost of the 8000 af per month conveyance system was combined with the lower.capacity Replacement Reservoir(s) and the 12,000 af per month system was combined with the larger capacity Replacement Reservoir(s). COST ESTIMATES From the preliminary design drawings, reconnaissance-level estimates of construction quantities and unit construction prices have been made. Construction quantities, prices and allowances have been combined to obtain an estimated total construction cost. Costs are indexed to January 1986. Future inflation is not included. To determine the funding necessary to complete the project, additional elements of project administration and financing costs have been added to obtain the total investment cost. Comparison of alternative reservoirs and combinations of reservoirs for this Study is based on estimates of debt service and average annual operating costs. The costs are comprised of the yeariy principal and interest payment (debt service) on assumed 30-year, 8 percent financing of the total investment cost and the estimated average annual cost of electricai pumping power, operating personnel, maintenance and repair costs. No price escalation was incorporated. No separate allowance was included for environmental mitigation. A summary of yearly debt service and average annual operating costs is presented in Table S.3. The relative costs among alternatives have been based on this average total cost per year. 7