2008-12-04_PERMIT FILE - C1994082 ‎(7)‎

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

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Yoast Mine
Pond 011 Permanent Feature Demonstration
NYDROLOGfC f~1PUT PARAi~li=7ERS
SEDCAD 4
Channel YPM-13
Watershed ID -Structure 2 - SWS1
Watershed Area: 26.3
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 26.1
Fair (30% - 70%) D 63 0.2
Aspen/Mountain Brush
Total 26.3
CURVE NUMBER 71
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/9992 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.
SEDCAD 4
Channel YPM-13
Watershed ID -Structure 2 - SWS1
Sedimentology: k factor
AREA
HYDROLOGIC SOIL
SOILS MAP UNIT/SOILS SERIES GROUP k FACTOR (acres)
B 0.32 26.1
Reclaimed
l D 0.20 0.2
ex
103 - Ustorthents-Cryoborolls comp 26.3
Total
Weighted k Factor 0.32
Soils series information from Yoast Mine Permit Application Package (see Tab 9, Soil Baseline Study [Nyenhuis,
1994]). Hydrologic Soil Group values are approved Yoast values (see Attachment 13-12, Table 13-12.2). The soil
erodibility factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2.
TR-37 13-4A.1-A.16 Revised 02108