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• the site has been dry during all monitoring events, see Figure 2.3-5 for sampling <br />locations. <br />The cross-section shown in Figure 2.2-7 is typical of the design fill. The slope of <br /> <br />the finished slope will be a relatively flat 3H:1 V. A rotational equilibrium analysis was <br />performed on this fill to determine its factor of safety. <br />The coal mine waste will be similar to the coaly material from the Loma loadout <br />placed at the Munger Portals. Lambert and Associates analyzed to coaly material from <br />the Munger Portal for triaxial shear strength tests. The coal material has a cohesion of <br />3psi or 432 psf, a angle of friction of 33° and a density of 82 pounds per cubic foot. Two <br />strength values were used for the alluvial colluvial material. Page 3-25 lists the <br />following strength parameters that were used for the alluvial colluvial material in the <br />stability analysis. <br />Material Density Cohesion Angle of Friction <br />Alluvial 125 200 25 <br />colluvial 130 1300 15 <br />Coal Mine Waste 82 432 32 <br />To provide a comparison, Powderhorn (Snowcap) Coal Company (SCC) used the <br />following strength parameters in its analysis of its two Cameo Refuse Disposal Areas: <br />Material Density pcf Cohesion psf Angle of Friction <br />Coal Waste 84 200 32 <br />colluvial/Alluvial 112 0 32 <br />Ref: SCC permit Volume 4, Appendices 13-4 and 13-5. <br />Permit Renewal 2-20 09/03 <br />