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Appendix B <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />BOWIE NO.2 MINE <br />COAL MINE WASTE DISPOSAL AREA NO. 3 <br />Notes for Calculations: <br />1. Pages 5 -7 present a spread sheet calculation of the required capacity of Sediment Pond J <br />based on the 10 year, 24 -hour event, and sizing of the emergency and embankment spillways. <br />Page 15 is the structure summary for Pond J which verifies the runoff based on the 10 -year, 24- <br />event for Pond J. Pages 12 -14 are the Structure Networking for the Pond J drainage area, and <br />pages 39 -43 are the Subwatershed Hydrology Details. <br />2. Page 46 shows the peak flow used to size the emergency and embankment spillways using <br />the 25 -year, 24 -hour event in the SEDCAD4 program. <br />3. Design points are shown on Maps 21 -1 and 21 -3. <br />4. Ditches were sized using SEDCAD4. Ditches were sized using the 10 year and 100 year, 24- <br />hour event and begin on page 16. See page 2 for the Pond J ditch and culvert summary. <br />ENGINEER'S CERTIFICATION <br />The calculations and information presented on the following pages were prepared by me during <br />the months of SepterrfsNd December 2014 and the information presented is true and correct <br />to the best of mv,kA WPRk 4 and belief. <br />•Q F'. <br />9: <br />43402 <br />Ta *riy .FStover- Bishop, P.E. <br />RegistereWrofessional Engineer <br />State of Colorado No. 43402 <br />12.2 "I v 14 <br />Date <br />TR -91 Volume XI, App. B -1 12/14 <br />