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
Postmine Channel Design
HYDROLOGIC INPUT PARAMETERS

SEDCAD 4
Channel YPM-1-2
Watershed ID -Structure 3 -SWS2
Sedimentology: k factor AREA
SOILS MAP UNIT/SOILS
SERIES
HYDROLOGIC SOIL GROUP k FACTOR acres)
(
g 0.32 7.20
Reclaimed 7 8
Total
Weighted 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
Channel YPM-1-2
Watershed ID -Structure 3 - SWS1
r~
dimentology: Control Factor
~~~
LAND USE CONDITION COVER TYPE
distrubed Aspen/Mtn. Brush
claimed Reclaimed
Total
VEGETATION FACTOR (acre
25% canopy, 80% 0.042 0.55
ground cover
60% ground cover 0.042 2.57
3.1
Weighted C Factor 0.042
SEDCAD 4
Channel YPM-1-2
Watershed ID -Structure 3 -SWS2
dimentology: Control Fac

LAND USE CONDITION tor

COVER TYPE

EGETATION
CONTROL

FACTOR
ARE

(acre:

disturbed
Sagebrush 25% Canopy, 80%
ground cover 0.042 0.6
d Reclaimed 60% ground cover 0.042 7.2
claime 7.8
Total
Weighted 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
Converafion 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).
•
TR-37 13-12.1-67
Revised 02/08