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'.' New Safe Yield The safe annual yield of the Straight Creek collectlon system would be zero without West Slope storage and about 3,000 scre-feet with West Slope storage. The safe annual yield would be about 7,000 acre- feet if increased storage were made available in the South Plstte River drainage. The project - would not produce new safe annual yield alone because the existing DWD system does not have excess carryover storage capacity to protect against senior wster rights calls. Cost of Project The capital construction cost of the project, including interest during construction, is estimated to be $27.5 million with East and West Slope replacement storage. Capital cost per acre-foot of safe yield would be $3,900. Annualized capital cost (using 50 years at 8 percent interest) would be $281,000. Including $17,000 for annual operation and maintenance costs, the annualized cost per acre-foot of ssfe yield would be approximately $1,200. Mitigation would add approx- imately $800,000 to $2 million to the total project cost. Significant Impacts Potentially significsnt impacts could occur to the wetlands and riparian areas along Straight Creek downstream from the diversion point as a result of the operation of the Straight Creek collection system. Wetlands and Riparian Areas. Approximately 30 acres of wetlands along Straight Creek could experience adverse impscts. Alteration or elimination of the wetlands would be a significant impact to local biological resources. The actual acreage of wetlands that would be affected by the Straight Creek project is unknown. Under a worst-case analysis, all 30 acres would be eliminated. Reconstruction or creatIon of 30 acres of new wetlands to mitigate the total loss would cost between $130,000 and $260,000. Total elimination of all wetlands is 12