2008-12-04_PERMIT FILE - C1994082 ‎(35)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Sediment Ponds SEDCAD4 Results
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1
• Media Type: D
• Archive: No

Yoast Mine
Pond 012A Design
HYDROLOGIC INPUT PARAMETERS

SEDCAD 4
Channel YPM-2
d ID -Structure 2 - SWS1
•
edimentology: k factor AREf
SOILS MAP UNIT/SOILS HYDROLOGIC SOIL k FACTOR (acre:
SERIES GROUP
B 0.32 4.30
eclaimed 0.6
3C/D/EiF - Winevada loam B 0.23
4.9
Total
k Factor 0.31
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.
SEDCAD 4
Structure 2 - SWS1
Watershed W-11 (YPM-11)
Sedimentology: Control Factor
CONTROL AREA
VEGETATION FACTOR (acres)
LAND USE CONDITION COVER TYPE
25% Canopy, 80% 0.042 0.6
Undistrubed Aspen/Mtn. Brush ground cover
Reclaimed Reclaimed 60% ground cover 0.042 4.3
4.9
Total
Weichted C 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 Soit 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).
TR-37 13-12.1-65
Revised 02108
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.