2008-01-16_PERMIT FILE - C1994082A ‎(2)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2008
• Doc Name: Sediment Ponds SEDCAD4 Results
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1
• Media Type: D
• Archive: Yes

Yoast Mine
Pond 12A Design
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel YPM-1-3
Watershed ID -Structure 5 - SWS1
Watershed Area: 9.5
West side subwatershed
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 6.28
Aspen/Mountain Shrub Good (>70%) C 41 3.23
Tota I 9.51
CURVE NUMBER 61
SEDCAD 4
Channel YPM-1-3
Watershed ID -Structure 5 - SWS2
Watershed Area: 11.6
East side subwatershed
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 8.80
Reclaimed Topsoiled, no vegetation B 86 1.70
Sagebrush Good (>70%) C 47 1.10
Total 11.60
CURVE NUMBER 71
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.
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TR-36 13-12.1-68 Revised 08/07