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
•

Pord 10 System
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Structure S - SV'JS1
V`/atershed -Channel YPM-21
Watershed Area: 5.2
Curve Number:
HYDROLOGIC CURVE
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER AREA (acres)
Fair (30% - 70%) B 71 5.17
Reclaimed
Total 5.2
CURVE NUMBER 71
Vegetation cover canditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetaton
Baseline Repcrf, Ycasf Study Area (ESCO Associates, 1993). Approved Yoast Ntine 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
Structure 8 - SWS1
Watershed YPM-21
Sedimentology: k factor
SOILS MAP UNIT/SOILS
SERIES HYDROLOGIC SOIL
GROUP
B
k FACTOR
0.32 gREA (acres
)
5.17
Reclaimed
Total 5.2
Weighted k Factor 0.32
Soils series information from Yoast Mine Permit Application Package (see Tab 9, Soil Baseline Study
[Nyenhuis, 1994]). Hydrologic Sail Group values are approved Yoast values (see Attachment 13-12, Table
13-12.2). The soil erodibiliry factor, "k-Factor', values are presented in Attachment 13-12, Table 13-12.2.
SEDCAD 4
Structure 8 - SWS1
Watershed YPM-21
Sedimentology: Control Factor
CONTROL
LAND USE CONDITION COVER TYPE VEGETATION FACTOR AREA (acres)
Reclaimed Reclaimed 60% ground cover 0.042 5.17
5.2
Total
Weighted Control Factor 0.042
The Control Factor values are approved Ycast 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 Wamer et al. {1998) as reported in Warner et
al. (1998).
Revised 02/08
TR-37 13-3A.1-A.36