2008-12-04_PERMIT FILE - C1994082 ‎(10)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Pond 012 and Pond 012A Two-Pond System Design ‎(Pgs 13-12.1-149 to 13-12.1-225)‎
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1 Part 2
• Media Type: D
• Archive: No

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Yoast Mina
Pond 012/012A Systarn
NYaROLUGIC INPUT PAR.AME7'ERS
SEDCAD 4
Channel YPNt-6-1
Watershed ID -Structure 7 - SWS1
West side subwatershed
WJatershed Area: 8.2
Curve Number:
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (3d% - 70%) B 71 1.54
Aspen/Mountain Shrub Good (>70%) B 30 2.13
Aspen/Mountain Shrub Good (>70%) C 41 4.56
8.23
Total
CURVE NUMBER 44
SEDCAD 4
Channel YPM-6-1
Watershed ID -Structure 7 - SWS2
l~l
`_J
•
East side subwatershed
Watershed Area: 27.8
Curve Number:
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 20'50

Aspen/Mountain Shrub Good(>70%
) B 30 3.78

Aspen/Mountain Shrub
Good (>70%)
C
41 0 22
Sagebrush
Good (>70%)
B
35
2.20
Sagebrush Good {>70%) C 47 2718

Total 2
CURVE NUMBER
61
13-12.1-183 Revised 08/08
7R-37
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.