2008-12-04_PERMIT FILE - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: 10 Year, 24 Hour Postmine SEDCAD Demonstration
• Section_Exhibit Name: Tab 13 Attachment 13-3A.1 Appendix 13-3A.1-A
• Media Type: D
• Archive: No

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TR-37
YOAST MINE
Pond 10 -Watershed W-1
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Structure 1 - SWS1
Watershed W-1
Watershed Area: 402.3
Curve Number:
HYDROLOGIC CURVE
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER AREA (acres)
AspenlMountain Brush Good (>70%) B 30 80.92
AspenlMountain Brush Good (>70%) C 41 123.9
Aspen/Mcuntain Brush Good (>70%) p 48 16.68
Pasture/Meadow Fair (30% - 70%) C 79 7.64
PasturelMeadcw Fair (30% - 70%) D 84 14.82
Mesic Drainage Fair (30% - 70%) B 48 4.74
(Mesic Drainage Fair (30% - 70%) C 57 1.51
Sagebrush Good (>70%) B 35 11.61
Sagebrush Good (>70%) C 47 15.21
Sagebrush Good (>70%) D 55 6.8
Steep Mountain Brush Goad (>70%) B 48 9.55
Steep Mountain Brush Gcod (>70%) D 73 29.31
Rock Outcrop Bare D 98 5.07
Reclaimed Fair (30% - 70%) g 71 66.22
d Eare C 91 8.3
Haul Roa
Total 402.3
CURVE NUMBER 51
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetaticn
Baseline Repon, Yeast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are
presented in Attachment 13-12, Postmining Drainage and Sediment Control, Table 13-12.1. Values were
adapted from Urban Hydrology for Smal! Watersheds, Technical Release No. 55 ,Soil Conservation
Service, 1986.
SEDCAD 4
Structure 1 - SWS1
Watershed W-1
Sedimentology: k factor
SOILS MAP UNITlSOILS HYDROLOGIC SOIL
SERIES GROUP k FACTOR AREA (acres)
Reciaimed B 0.32 66.22
XSD/E/F -Winevada -Splitro B 0.37 83'2
2D/E/F - Routt loam C 0.24 122.8
6B - Zoltay varient clay loam C 0.21 12'4
11 C/D - Binco clay loam D 0.24 19.7
12C/D -Buckskin loam C 0.19 12.9
27B/D -Silas loam B 0.28 10.4
34C/D/E/F - Coutis silt loam B 0.37 2.6
35C/D/E - Aaberg clay D 0.19 2.8
46C/D -Splitro loam C 0.24 5.0
53C/D/E/F -Winevada loam B 0.23 4.4
66D/E/F - Foidel loam B 0.28 3•g
103 - Ustorthents-Cryoborolls D 0.20 42.8
Haul Road D 0.16 8.3
D 0.05 5.1
Rock Outcrop
Total 402.3
Weighted k Factor 0.27
13-3A.1-A.22
Revised 02108