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<br />'. <br /> <br />tain Reservoir. The new safe annual yield of the Green Mountain <br /> <br /> <br />pumping system with the Eagle-Colorado Reservoir would be 120,000 <br /> <br /> <br />acre-feet. With East Slope storage, the new safe annual yield would be <br /> <br />134,000 acre-feet. <br /> <br />Coat of Project <br />The capital construction cost of the project, including interest <br />during construction, would be $547 million with West Slope replacement <br />storage. The capital cost per acre-foot of safe yield would be $4,560. <br />The annualized capital cost (using 50 years at 8 percent interest) <br />would be $45 million. Including $7 million for annual operation and <br />maintenance costs. the annualized cost per acre-foot of safe yield <br />would be approximately $450. Mitigation would add approximately $22 to <br />$34.5 million to the total project cost. <br /> <br />Significant Impacts <br /> <br />Construction and operatIon of the Green Mountain pumping collec- <br /> <br />tion system would generste significant short-term and long-term <br /> <br /> <br />impacts. Significant impacts would occur to water quality, aquatic <br /> <br />life, wetlands and ripsrian areas, soils, vegetation, wildlife, <br /> <br />threatened and endangered species, and cultural resources. <br /> <br />Water Quality. The most significant water quality impact would be <br />associated with the incressed eutrophication rate of Dillon Reservoir. <br />The algal cormnunity in the reservoir is reportedly limited by phos- <br />phorus and nitrogen during summer stratification. After July, new <br />supplies of nitrogen would prolong the fairly high productivity <br />observed in June and early July. The resul,t would be greater biomass <br />sinking to the bottom, thereby increasing oxygen depletion. Reduced <br />transparency and changed water color could also be expected. Assuming <br />that Green Mountain pumping system water would be delivered directly to <br /> <br />20 <br />