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<br />a <br />o <br />'" <br />en <br />.... <br />w <br /> <br />Three pump stations are proposed. The intake pump station would be located at the base of <br /> <br />Green Mountain Dam, close to the existing hydropower plant. Two stations would be located along <br /> <br />the pipeline route. One pump station would be located south of Slate Creek on the west bank of the <br /> <br /> <br />Blue River and the other located west of Colorado Highway 9 about 4500 feet north of the <br /> <br /> <br />Silverthorne sewage treatment plant. Each of these sites would accommodate a pump building <br /> <br /> <br />constructed partially below ground, and a surge control building. The sites along the route would <br /> <br />also contain an open fore bay reservoir with a water surface of about 1.5 acres. <br /> <br /> <br />OPERATION OF THE CONVEYANCE SYSTEM: Two conveyance capacities, representing a <br /> <br />range of the options available, have been studied: 8000 af per month and 12,000 af per month. To <br /> <br />formulate Green Mountain Exchange Project lllternatives In this Study, the estimated cost of the 8000 <br /> <br /> <br />af per month conveyance system was combined with the lower capacity Replacement Reservoir(s) <br /> <br />and the 12,000 af per month system was combined with the larger capacity Replacement <br /> <br /> <br />Reservoir(s). Further development of the project may consider other combinations and other <br /> <br /> <br />conveyance capacities. <br /> <br />To estimate electrical power consumption, it was assumed that pumps would operate for the <br /> <br /> <br />portion of the year necessary to provide the llverage conveyance flow for the particular alternative. <br /> <br /> <br />The 8000 af per month system considered in this Study, with a power requirement of 20 megawatts <br /> <br /> <br />(MW), would use 146 gigawatt-hours (GWh) of electrical energy per year. The 12,000 af per month <br /> <br /> <br />system, with power requirement of 30 MW, would use 240 GWh per year. Both Public Service <br /> <br /> <br />Company of Colorado and Mountain Parks Electric, Inc. are capable of providing the pump-station <br /> <br />power from existing primary transmission. line,s and generating facilities with scheduled <br /> <br />improvements. A 2-mile transmission line extension was included In the cost estimates to serve the <br /> <br />Slate Creek Site and a new substation was Included In the cost estimate of the Blue River Site. <br /> <br />". <br />,>r,' <br /> <br />.",::' <br /> <br />IMPACT OF PUMPBACK ON GREEN MOUNTAIN HYDROPOWER: The combined impact of <br /> <br /> <br />the pumpback conveyance system operation and the Increased storage retained in Dillon Reservoir <br /> <br />due to the Green Mountain Exchange Project, would reduce most monthly water flows for generation <br /> <br />to less than the minimum capacity of the Installed turbines (29 MW) at Green Mountain Power Plant, <br /> <br />Current (1986) revenue from the sale of powsr is $340,000 based on average annual water flows <br /> <br />over the last 10 years of 320,000 aflyr and current power sales contracts, This amount has been <br /> <br /> <br />included in the project cost estimates as an obligation of the conveyance system. <br /> <br />14 <br />