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

•

YOAST i~11NE
Pond 10 -1~Jatershed YY-15
HYDROLOGIC 1l~1P1lT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 7 - SWS1
Watershed W-15 (YPM-15)
Watershed Area: 13.0
Curve Number:
HYDROLOGIC SOIL CURVE
WATERSHED TYPE VEGETATION COVER GROUP NUMBER AREA (acres)
Aspen/Mountain Brush Goad (>70%) ~ B 30 2.6
Aspen/Mountain Brush Goad (>70%) C 41 3.50
Reclaimed Fair (30% - 70%) E 71 6.91
Total 13.0
CURVE NUMBER 55
Vegetation cover conditiens presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation
Easeline Repot, Yoast Study Area (ESCO Asscciates, 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 Y,ydrology fcr Small Watersheds, Technical Release No. 55, Soil Conservation Service,
1986.
SEDCAD 4
Structure 7 - SWS1
Watershed W-15 (YFM-15)
Sedimentology: k factor
SOILS MAP UNIT/SCILS HYDROLOGIC SOIL
SERIES GROUP k FACTOR AREA (acres)
Reclaimed B 0.32 6.91
46C/D - Splitro Icam C 0.24 3.5
53C/D/E/F - Winevada loam B 0.23 2.6
Total 13.0
Weighted k Factor 0.28
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
13-3A.1-A.34
Revised 02/08