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• Appendix M <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />MCCLANE CANYON MINE <br />COAL MINE WASTE DISPOSAL SITE <br />Notes for Calculations: <br />1. Pages 13-17 present a spread sheet calculation of the required capacity of the <br />sediment pond based on the 10 year event. <br />2. Design points are shown on Figure 2.2-3. <br />3. Ditches were sized using SEDCAD4. Ditches were sized using the 10 year and 100 <br />year event as appropriate. Ditches 1-6, 7-1, 7-2, 8-1, 8-2, 9, 11-1, 11-2, 12, 13, 15, 16 <br />and 18 were sized with the 100-year event. Ditches 1-6, 10-1, 10-1 a, 10-2, 14 and 17 <br />were sized with the 10 year event. <br />4. Page 54 shows the peak flow used to size the emergency and embankment <br />spillways using the 25-year event in the SEDCAD4 program. <br />ENGINEER'S CERTIFICATION <br />The calculations and information presented on pages 12-73 with a date of 05/08 <br />were prepared under my direct supervision during the months of April and May 2008, <br />and the information pres~e~n~t~ d is true and correct to the best of my knowledge and <br />belief. ~~p0 ~~~~'~$ <br />0~ovs~tis 5~~~~~Q~ <br />4 c~..,e,.,.,~, /.~.~.~ <br />~J,~nes E. Stove~.E. Date <br />Reged Profes~t~l Engineer <br />Stat~'~;~}~F~'~~o. 19230 <br /> <br />TR-16 12 05/08 <br />