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- 12 - <br /> all stability of the cut face is marginal. It is evident that <br /> the existing factor of safety of the slope is very close to <br /> a unity at the locations where small slides keep developing. <br /> Even if there are no signs of a larger instability, we <br /> feel that remedial measures should be undertaken in the near <br /> future to improve the overall stability conditions. There are <br /> numerous alternatives for improving the stability of the cut. <br /> It appears that the most economic and effective way to im- <br /> prove the stability is flattening of the cut slopes. As most <br /> sloughing is occurring within the colluvial soils, the cut <br /> portions in soils should be flattened. Detailed recommend- <br /> ations on how much the slope should be flattened will be made <br /> during the next phases of the studies. We feel, however, that <br /> flattening of the slope to less than 45 degrees steep would be <br /> necessary. <br />• We feel that flattening of the slope could be performed <br /> only in cut portions that are in soils. There are no evident <br /> stability problems visible in rock except for the two slides <br /> mentioned above. 47e feel that it would be sufficient to <br /> flatten the slope of the rock cut only at the two locations <br /> of developing slides in rock at the east end of the diversion <br /> channel. <br /> 4.3 ROCK CUTS <br /> There are numerous other rock cuts excavated at the <br /> site. The largest of them is a benched cut between the fan <br /> level and the portal level. This cut can be subdivided into <br /> two portions; the upper portion between the fan level and <br /> the road, and the lower portion which is the portal cut be- <br />• tween the portal level and the road. <br /> ccaNrao coMw~nwa, wc. <br />