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<br />5.1. 2 The No Act Ion Al ternat Ive would create no new envl rorvnental <br />consequence over those presently existing. There would be no <br />disturbance due to construction, or displacement of vegetation and <br />wildlife due to Inundation. However, the town of Rangely would <br />continue to utilize Its direct flow diversion right to supply Its <br />growing population. Without the storage of a reservoir or the <br />supplement of ground water, flow In the White River downstream from <br />the town could be eliminated during times of drought. No new <br />recreational opportunities would be created In the area and present <br />flood frequencies would continue to exist, The project area would <br />continue to experience the pressures of growth with the possible loss <br />of wlldl ife habitat to continued development, The consequences of <br />Implementation of each of the action alternatives on the various <br />environmental elements is discussed In this chapter. <br /> <br />5.2 GEOLOGY <br /> <br />5.2.1 Field Investigations of the four reservoir alternatives and <br />laboratory analysis Indicate the proposed dam sites are geologically <br />sound, with the exception of deep accumulation of overburden fonnlng <br />the upper portion of the left abutment of the lower slte.(2'-t) The <br />left abutment Is a thick deposit of dry, poorly consolidated eolian <br />material under which lies a tongue of permeable sand and gravel <br />terrace deposits. Fill required for the highway relocation around the <br />left abutment of the lower dam site would reduce seepage beneath the <br />dam and Increase the stability of the abutment. The upstream dam site <br />lies within the same geologic formations and should present no rrore <br />difficulties to construction than the lower site. <br /> <br />5.2.2 Slope stability In the reservoir areas Is not expected to be a <br />problem. Overburden materials on the perimeter are generally stable <br />and present no severe landslide hazard. Small scale slU11plng and <br />slope adjustment can be expected at or below the water line of the <br />reservoir. This adjustment Is rrost likely to occur beneath sandstone <br />ledges and should have no long tenn effects on reservol r perimeter <br />stability. <br /> <br />42 <br />