2016-10-12_PERMIT FILE - C1996083A

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 10/12/2016
• Doc Name: Appendix A through Appendix C
• Section_Exhibit Name: Volume IX Coal Mine Waste Disposal Area No. 2
• Media Type: D
• Archive: Yes

Appendix B
PROTECTION OF THE HYDROLOGIC BALANCE
BOWIE NO.2 MINE
COAL MINE WASTE DISPOSAL AREA NO. 2
Notes for Calculations:
1. Pages 3 -10 present a spread sheet calculation of the required capacity of the
sediment pond F based on the 10 year event.
2. Design points are shown on Figure 2.
3. Ditches were sized using SEDCAD4. Ditches were sized using the 100 year event.
Page 53 shows the peak flow used to size the emergency and embankment spillways
using the 25 -year event in the SEDCAD4 program.
ENGINEER'S CERTIFICATION
The calculations and information presented on pages 132 -1353 with a date of 11/12
were prepared by me duO.a s of October and November 2012, and the
information presented i r to the best of my knowledge and belief.
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TR -76 App. B -1 11/12