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Appendix B <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />BOWIE NO.2 MINE <br />COAL MINE WASTE DISPOSAL SITE <br />Notes for Calculations: <br />1. Pages 2 -8 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. <br />3. Ditches were sized using SEDCAD4. Ditches were sized using the 100 year event. <br />Page 40 shows the peak flow used to size the emergency and embankment spillways <br />using the 25 -year event in the SEDCAD4 program. <br />ENGINEER'S CERTIFICATION <br />The calculations and information <br />prepared under my direct <br />• u <br />information presented is to <br />nted on pages 2 -40 with a date of 04/09 were <br />uring the month of April 2009, and the <br />the best of my knowledge and belief. <br />�o <br />James E°tgver, P. <br />Registered Prd�ana <br />State of Colorazl <br />• <br />Date <br />30 <br />r <br />TR -61 04/09 <br />PP/Rovsb <br />6/ 1'1 10 4 <br />