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APPENDIX M(vii) <br />MUNGER CANYON MINE <br />COAL MINE WASTE DISPOSAL SITE <br />AS-CONSTRUCTED CONFIGURATION <br />Notes for Calculations: <br />1. Pages M(vii)-2 & 3 present a spread sheet calculation of the required capacity <br />of the sediment pond based on the 10 year event. <br />2. Page M(vii)-4 is a ditch and culvert sizing summary. <br />3. CMP 1, 2 and 3 are shown on Figure 2.2-6. <br />4. Ditches were sized using SEDGAD4. Ditches were sized using the 10 year <br />and 100 year event as appropriate. Ditches C, D, F, I and J were sized with the <br />100-year event, Ditches K , L and M were sized with the 10 year event. <br />5. Page M(vii)-26 shows the peak flow using the 25-year event in the SEDGAD4 <br />program. This peak flow is for the interim configuration. The original emergency <br />spillway design utilizes a 21"diameter and is shown on page M(vii)-5. <br />6. A berm will divert surface run-off away from the southern and western edges <br />of the sediment pond. <br />ENGINEER'S CERTIFICATION <br />The calculations and information presented on pates M(vii)-1 through M(vii)-25 <br />were prepared under my direct su envision during the months of March, 2007 <br />®,~ <br />and the information presentec{~' EueE~q~~on-ect to the best of my knowledge <br />and belief. e ~ _^°"'°9° s ~ <br />®~a~4, G,~~r; <br />o , Q- ~~, <br />o °~ ~:~ . <br />®~~ Iy233-f ;'= <br />a~l~ <br />e~,"~;S#~ver„P'E ~ Date <br />area~~lorado~Piofessional Engineer <br />State of~oYorado, No. 19230 <br />~J <br />TR-22 <br />M(vii)-1 <br />03(07 <br />