2008-12-04_PERMIT FILE - C1994082 ‎(35)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Sediment Ponds SEDCAD4 Results
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1
• Media Type: D
• Archive: No

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Yoast Nline
Pond 012A Design
HYDROLOGIC 1>yPUT PARAMETERS
SEDCAD 4
Channel YPM-6-2
OPTION 2
Watershed ID -Structure 9 - SW51
West side subwatershed
Watershed Area: 5.5
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 4.51
d
i
l
R No Vegetation
soiled
To B 86 1.03
me
ec
a Total ,
p 5.5
CURVE NUMBER 74
SEDCAD 4
Channel YPM-6-2
OPTION 2
Watershed ID -Structure 9 - SW52
East side subwatershed
Watershed Area: 20.3
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYFE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Topsoiled, No Vegetation B 86 0.92
Reclaimed Fair (30% - 70%) B 71 16.41
Steep Mountain Brush Good (>70%) D 73 1.01
Goad (>70%) B 41 2.00
Sagebrush
Total 20.3
CURVE NUMBER 69
SEDCAD 4
Channel YPM-6-2A
OPTION 2
Watershed ID -Structure 9 - SWS3
Watershed Area: 11.6
Curve Number:
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 6.21
Aspen/Mountain Shrub Good (>70%) B 30 .4.52
~ Good (>70%) C 41 0.88
Aspen/Mountain Shrub
Total 11.6
CURVE NUMBER 53
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation Baseline Report,
Yoast 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 Small
Watersheds, Technical Release No. 55, Soil Conservation Service, 1986.
TR-37 13-12.1-77 Revised 02!08