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Alr. Roy f:,,m <br />~ .rn,rcv Coal (:onp,ary <br />frnrt '8..006 <br />Purr <br /> <br />• Slope/~~/ Analysis for a Circular Failure, FS=? 00 <br />A brief calcu]ations summary along with the methodology and results of the back analyses for <br />slope stability aze presented in .\ppendix A, Slape Stability ~ Inulyrir. <br />The following analyses were performed using SEDCAD 4 computer softwaze: <br />• The amount of runoff into the new drainage channel PM-4C Eor a l0year24hour Storm <br />event. <br />• The amount of cunoEE inro the Half-Round Comrgated Metal Pipe (CMP) channel PM- <br />4D fora 25 yeaz-24 hour storm event. <br />• The minimum culvert diameter for Culvert PM-10 with additional flow from PM-4C. <br />• To size the Dw rip rap size in the surge pool below the CMP channel <br />The SEDCAD 4 results from the above analyses aze listed below. <br />• Flow rate through PM-4C during a l0yeaz-24hour Storm event equals 0.88 cfs. <br />• The Flow rate through PM~D during a 25yeaz-24hour Storm event equals 1.79 cfs. <br />• Minimum culvert diameter Eor PM-10 equals 10 inches. <br />• Using the Pader method, the Dsri rip rap size equals 9 inches. <br />The analysis and software printout results of the SEDCAD 4 analyses are contained in Appendix <br />B, SEDGAD 4 Mode! Rera![r. <br />The updated dimrnsions of PM-4C, PM-4D and PM-10 are contained in Appendix C, Chaeael arsd <br />CulaeR Schedsrlea. <br />The final post-mining topography map, plan view drawing, and cross sectional drawing of PM-4D <br />are all attached in Appendix D, Dramiagr. <br />IE you have any further questions regarding these analyses or results please Eeel free to contact me. <br />Sineexely, <br />MWH r <br />M~ ody using; E.I.T <br />Associate Civil En¢inei <br />Attachments <br />cc: Jay James <br />