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i• <br />•_ <br />• <br />Appendix N <br />Powderhorn Coal Company Strength Parameters <br />Material Density pcf Cohesion psf Angle of Friction <br />Coal Waste 84 200 32 <br />Colluvial/Alluvial 112 0 32 <br /> <br />S~ - Single Failure Surface <br />Enter the X, Y, and R for the failure surface: <br />X = / 168 Y = 198.0 R = 166.3 FS = 2.64 Min FS = 2.64 <br />160 <br />140 <br />120 <br />100 <br />80 <br /> <br /> <br />60 ~~ <br />Coal Mine Waste "'~~Cover <br />~ ~i <br />40 ~ Failure Circl~~_ <br />ColluviaUNluvial Material ~ <br />~ <br /> ~ <br />O 40 80 120 160 200 <br />The stability analysis and in CtQfi pi <br />during the month of June ?~ ;iq~i'the <br />belief. ~ ~, e Qee~~'' <br />e e~ <br />sire <br />• . ~~me <br />• <br />page and the preceding two pages were prepared by me <br />rented is true and correct to the best of my knowledge and <br />~' o 0 <br />~ =tz~ <br />~~ -°r 1 <br />~. lovers= <br />'rofessibn~~ngineer <br />igIA~~4~~10. 19230 <br />:A®~°® <br />Page 3 of 3 <br />