2008-01-16_PERMIT FILE - C1994082A ‎(3)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2008
• Doc Name: Post Mining Channels SEDCAD Results/Channel YPM-1 to YPM-8
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13.12.3
• Media Type: D
• Archive: Yes

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TR-36
Yoast Mine
Postmine Channel Design
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Pond 12A
Watershed ID -Structure 1 1
Watershed Area: 3.8
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Topsoiled, No Vegetation B 71 3.2
Good (>70%) C 41 0.6
Aspen/Mountain Shrub
3.8
Total
CURVE NUMBER 67
SEDCAD 4
Pond 12A
Watershed ID -Structure 11 - SWS2
Watershed Area: 1.5
Pond surface
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Water surface N/A 100 1.5
Pond 1.5
Total
CURVE NUMBER 100
Approved Yoast Mine curve numbers are presented in Appendix 13-12, Postmining Drainage and Sediment
Control ,Table 13-12.1. Values were adapted from Urban Hydrology for Small Watersheds, Technical
Release No. 55, Soil Conservation Service, 1986.
13-12.3-25
Revised 08/07