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``�c•) MORRISON-KNUDSEN COMPANY,INC. <br /> to catch the run-off from the refuse pile, and a sediment control facility <br /> are the only type of water control structures that would be needed. <br /> 1 .5.2 Cross-Valley Refuse Pile <br /> The second storage site was located on the Bear Creek drainage as <br /> shown in Figure 1-1 . The dimensions and volume are given in Table 1 .5.2-1 — . <br /> TABLE 1 .5'2-1 <br /> SLOPE HEIGHT SLOPE ANGLE VOLUME <br /> `)— egreesT mmcy <br /> 300' 270 9.49 <br /> The surface area of the pile is approximately 71 acres. Mid-Conti- <br /> nent would need to acquire approximately 50 acres of. additional land. The <br /> height constraint was applied to the free slope faces only and not on the <br /> sides restrained by the valley walls. <br /> There are several disadvantages- of this location. First, Bear Creek <br /> would need to be diverted around the refuse pile to another drainage by <br /> means of a permanent channel , or routed under the refuse pile by means of <br /> culverts. Even with a diversion channel , culverts would be needed to col- <br /> lect water not drained by the channel . The length of the diversion chan- <br /> nel would be approximately 16,000 feet. It would be difficult to construct <br /> the diversion channel due to steeply inclined valley walls. The channel <br /> might have to be lined for stability purposes. <br /> The length of the culvert to route Bear Creek would be approximately <br /> 3000 feet. Using a culvert alone to route Bear Creek, has the advantage <br /> of allowing the creek to discharge at its "natural mouth". <br /> 1-13 <br /> 'I <br />