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<br />--,- --------_.._---,~....---~~----- .-- <br /> <br />..-i <br /> <br />Highwav Route - The proposed highway route follows the west shore of Green Mountain <br />Reservoir and west side of Colorado Highway 9 to the town of Silverthorne, Using this route would <br />allow the installation of the pipeline in the highway right-of-way where practical, It would require <br />only one crossing of the Blue River, Impacts associated with this route include traffic delays and <br />temporary detours, soil erosion, and riparian vegetation removal along side the highway. <br /> <br />Mountainside Gravity Route - The mountainside gravity route would require pumping water <br />from Green Mountain Reservoir at elevation 7900 to approximately elevation 9200 to allow for gravity <br />flow to Dillon Reservoir, To avoid the Eagle's Nest Wilderness Area, a pressure pipeline section, as <br />in the highway route, would be installed from the reservoir to a pump station at Slate Creek, From <br />Slate Creek the pipeline would climb the mountain to a point where water would flow by gravity to <br />Dillon Reservoir. The covered canal section would generally follow the land contours to <br />approximately elevation 9000, immediately north of Silverthorne, from which point a pressure <br />pipeline would be employed to reach Dillon Reservoir. Along the route, inverted siphons would be <br />used to cross under creeks, <br /> <br />Several factors associated with this route would create negative impacts, One is excavation <br />on steep mountain slopes to create a bench for the installation of the pipeline and the access <br />roadway for pipeline maintenance, Another is the loss of a wide band of vegetation within the <br />heavily forested area along the east slope of the Gore Range which could create negative <br />environmental and visual impacts, <br /> <br />2,3 <br /> <br />INITIAL SCREENING <br /> <br />The objective of the initial screening was to eliminate at an early stage, those reservoir sites <br />that would not be suitable as a Joint-Use or Replacement Reservoir, To do this, existing data on the <br />nine identified reservoir sites was gathered and analyzed, A field examination of each site was also <br />conducted. Historical monthly streamflows were estimated and preliminary yields were calculated <br />for each site. Environmental and geotechnical factors which could preclude or seriously impede site <br />development were also considered, <br /> <br />Environmental factors that were considered included known cultural resources, known <br />threatened or endangered species, wildlife habitat and inundation of farm land, Based on the <br />information evaluated, there appeared to be no environmental factors which would preclude further <br />consideration of any of the reservoir sites, <br /> <br />2-4 <br /> <br />'-' <br /> <br />'-- <br /> <br />'--' <br />