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INTRODUCTION <br /> The contents of this report are the <br /> results of a slope-stability analysis for a proposed fill to be <br /> constructed as a part of the Mid-Continent Resources tunnel pro- <br /> ject, located c•.est of Redstone, Colorado. Soil characteristics <br /> and slope geometry were analyzed in order to provide recommen- <br /> dations for a stable slope configuration. <br /> The fill itself is to be constructed <br /> of material from the tunnel excavation. This material consists <br /> of dense Mancos Shale, which will be excavated by blasting. The <br /> fill will rest upon native glacial-alluvial deposits, consisting <br /> of coarse gravel, cobble, and boulder-sized particles in a silty, <br /> clayey, sand matrix. <br /> For purposes of slope stability anal- <br /> ysis, shear strength te:iting was pe,forx.ed on the native glacial <br /> alluvial materials, and on the shale which will be used for fill. <br /> The results of these tests are provided with this report. <br /> A slope stability analysis was then <br /> performed, using the shear strength test results, and assumed <br /> slope geometries. For a slope having a 2-horizontal to 1-vertical <br /> maximum gradient and two. terraces or benches of 10 feet in width, <br /> with an approximate height of 60 feet (Plate 1) , the factor of <br /> safety was found to be 3 . 5 . we would consider this slope config- <br /> uration to be stable. <br /> More complete discussion of the testing <br /> program and stability analysis can be found in the body of this <br /> report. All recommendations are subject to the limitations set <br /> forth herein. <br />