2008-12-04_PERMIT FILE - C1994082 ‎(7)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: 10 Year 24 Hour SEDCAD Demonstration
• Section_Exhibit Name: Tab 13 Attachment 13-4A.1 Appendix 13-4A.1-A
• Media Type: D
• Archive: No

Yoast Mine
Pond 011 Permanent Feature Demonstration
HYDROLOGIC INPUT PARAP~tETERS
•
SEDCAD 4
Pond 011
Watershed ID - Stru 5 - SWS1
Watershed Area: 3.0
Curve Number:
VEGETATION HYDROLOGIC
CURVE
AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)

Aspen/Mountain Brush Fair 30% - 70%
( ) B 48 2.7
ir (30% - 70%)
F B 70 0.3
Sagebrush a
Total 3.0
CURVE NUMBER 50
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, Sail Conservation Service, 1986.
SEDCAD 4
Pond 011
ID -Structure 5 -
~C„~~„~„~.,...y,....,._._.
HYDROLOGIC SOIL - AREA
SOILS MAP UNIT/SOILS SERIES GROUF k FACTOR (acres;
Reclaimed C 0.32
37
0
2.7
XSD/E/F - Winevada - Splitro complex g . 3
B 0 28 0.
27D -Silas loam 3.0
k Factor 0.33
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.
•
SEDCAD4
Pond 011
Watershed ID -Structure 5 - SWS1
Sedimentology: Control Factor CONTROL AREA
LAND USE CONDITION COVER TYPE VEGETATION FACTOR (acres)
Aspen/Mtn. Brush 25% canopy, 80% 0 042 2.68
Undistrubed ground cover
Sagebrush 25% canopy, 80% 0.042 0.29
ground cover
Total 3.0
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) Predicfing Soil Erosion by Wafer: 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 13-4A.1-A.21