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<br />, ~~ \ <br />t " ~~ ( <br />q~v. <br /> <br />. <br /> <br />the environment than the existing dam. <br />tional land plus the area required for <br />the development of these lands for any <br /> <br />Inundation of addi- <br />the dam will preclude <br />other use. <br /> <br />(2) Enlargement of Twin Lakes from the existing surface <br />area of 2,397 acres to 2,805 acres at the top of the new <br />active conservation pool will intermittently inundate <br />approximately 408 additional acres ,of land and about 1 mile <br />of Lake Creek above the existing reservoir. There will be <br />a shoreline of 13.7 miles at active conservation pool level. <br />Borrow areas, rock quarries and aggregate sources will alter' <br />natural contours and denude some areas of natural vegetation. <br />The principal borrow area lies within the beaching area. <br />Aggregate will be processed from the Sinclair Aggregate <br />Source and rip rap will be obtained from the Perry Peak <br />riprap source. <br /> <br />(3) The clearing of 28 acres of coniferous trees will be <br />required along the south shoreline of the enlarged reservoir. <br /> <br />(4) Ice which forms on Twin Lakes during the winter is <br />expected to slip and bend at the perimeter with daily <br />fluctuation of the lake. Although some shelving may occur, <br />it is not expected that ice fishing will be severely <br />impaired. <br /> <br />. <br /> <br />(5) About 736 acres of the reservoir floor are presently <br />exposed by annual fluctuation. Up to l,llO acres of <br />reservoir floor will be exposed when the enlarged reservoir <br />is at minimum pool level. The water level will be above <br />minimum pool most of the time. Water levels near minimum <br />pnnl ~ill ~ouully u~~ur only during periods when inflow and <br />precipitation are low, so erosion of the exposed lake floor <br />will be minimal. Some turbidity may result, as in the past, <br />when lakeshore areas are exposed to wind and wave action. <br /> <br />(6) Underwater excavation of the Mt. Elbert Pumped-Storage <br />Powerplant tailrace channel will result in some temporary <br />localized turbidity in the lower lake. Construction of the <br />Twin Lakes Dam may cause a slight amount of turbidity in <br />Lake Creek, but not in the lake since the new dam will be <br />constructed about 2,500 feet downstream from the existing <br />dam. <br /> <br />(7) Turbidity in the stream may result from pumping to <br />dewater the cutoff trench, river ouLlet works and spillway. <br />Turbidity may also result from runoff over freshly disturbed <br /> <br />. <br /> <br />IV-]l <br />