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 MINE
Pond 10 System
HYDROLOGIC INPUT PARA1V11=TtRS
SEDCAD 4
Structure 9 - SWS1
Watershed -Channel YPM-21A
N/atershed Area: 7.6
Curve Number:
HYDROLOGIC CURVE
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER AREA (acres)
Reclaimed Fair (30% - 70%) B 71 7.6
Total 7.6
CURVE NUMBER 71
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, Seil Conservation
Service, 1986.
•
SEDCAD 4
Structure 9 - SWS1
Watershed YPM-21A
Sedimentology: k factor
SOILS MAP UNIT/SOILS
SERIES HYDROLOGIC SOIL
GROUP
k FACTOR
AREA (acres)
Reclaimed B 0.32 7.60
Total 7.6
Weighted k Factor 0.32
Soils series infcrmation 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.
SEDCAD4
Structure 9 - SWS1
Watershed YPM-21A
Sedimentology: Control Factor

LAND USE CONDITION
COVER TYPE
VEGETATION CONTROL
FACTOR
AREA (acres)
Reclaimed Reclaimed 60% ground cover 0.042 7.6
Total 7.6
Weighted Control Factor 0.042
The Control Factor values are approved.Yoast Mine values as presented in Attachment 13-12, Table 13-
12.3. The values were originally presented in Renard, et al. (1997) Predicting Soil Erosion by Water. A
Guide to Converation Planning with the Revised Universal Soil loss Equation (RUBLE), Agricultural
Handbook 703, U.S. Department of Agriculture as reported in Warner et al. (1998) as reported in Warner et
al. (1998).
Revised 02/08
TR-37 13-3A.1-A.37