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slopes with the vertical distance between terraces not exceeding <br />_ <br />• <br /> 50-ft. Terraces are desirable on slopes for erosion control and to <br />permit access for slope maintenance. However, rather than the 50-f t. <br />vertical spacing of terraces, we would recommend a vertical spacing <br />of 30-ft. in order tc make access to the slope somewhat easier. Also, <br />we would recommend that the terraces be at least 10-f t, in width in <br />order to facilitate access for dozers and similar equipment. There- <br />fore our recommended slope configuration consists of 2:1 slopes located <br />between 10-ft. wide terraces, resulting in an overall slope angle of <br />approximately 2.3:1. A 2.3:1 slope extending to a crest elevation of <br />5025 will have a factor of safety of approximately 1.74 for the most <br />critical face slope of the pile. This factor of safety exceeds the <br />1.5 minimum recommended value, and is quite acceptable. The cross- <br />. section of the pile at Section A-A under these conditions is sho~,~n <br />on Plate No. 2. A general plan with contours is also sho~on on Plate <br />tio. 2. The storage pile conficuration shown on Plate No. 2 will have <br />a total storage of approximatel}~ 2,240,000 cubic yards. This repre- <br />sents an increased storage capacity of roughly 740,000 cubic yards, <br />or 49$. <br />CONCLUSIONS AND RECOMMENDATIONS: <br />Based upon the results of our laboratory testing and slope stabil- <br />ity analysis and on thc: project characteristics previously described, <br />the following recommendations are made. Should the project character- <br />istics be significantly altered from those assumed in this report, or <br />• should conditions of the fill material or other considerations on this <br />site be changed, ROCKY MOUNTAIN GEOTECHNICAL should be notified so that <br />our recommendations can be reviewed and adjusted if necessary. <br />