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Stability Analysis -Elk Creek Refuse Pile <br />'^he stability of the Elk Greek refuse pile has been analyzed using two methods. <br />.cesulta of both analyses are conservative enough not to warrent any further <br />stability investigations, In each case an angle of internalfriction and corres- <br />ponding safety factor was generated based on statics, Referencing drawing <br />number C8-1196, results are as follows: <br />Method 1 -shown on pages F-40-43, analyzes the potential slip <br />failure at the contact between the foundation and the refuse. The <br />safety factor, at a friction angle of 20°, is 2. 58. <br />Method 2 -shown on pages F-44, 45, analyzes the potential <br />foundation base failure. A safety factor of 1.5 is achieved at <br />a friction angle of 32°, <br />The foundation soil does have some inherent soil cohesion, but for the sake of <br />comparison and lack of field test data, all friction angles are calculated with <br />no assumed cohesion. Coheaionless soil is by definition the condition where <br />the angle of internal friction is equal to the natural angle of repose. The foundation <br />material is primarily shales and sandstones which are the result of mass wasting <br />of the adjacent mountainside. The angle of repose for these materials is 39° <br />(B. F. Goodrich Engineering Handbook, Denver Equipment Company Handbook) <br />which corresponds to a safety factor of 1. 9. To substantiate the calculations, the <br />Operator is currently having a refuse sample analyzed for its shear strength <br />haractetistics. Results will be forewarded to the Division when received by the <br />• Operator. <br />F-39 <br />Rev. 1; 6-18-81 <br />Rev. 3: 3-18-82 <br />• <br />