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 -Watershed W-16
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Structure 4 - SWS1
Watershed W-16 (YPM-16)
Natershed Area: 18.1
:urve Number: HYDROLOGIC CURVE
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER AREA (ac
4spenlMountain Brush C-ood (>70%) B 30
48 0.37
0.81
4spen/Mcuntain Brush Good (>70%) C
55 0.77
D
Gaod (>70%)
Sagebrush Fair (30% - 70%) B 71 16.16
Reclaimed 18.1
Totai
CURVE NUMBER 68
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation Easeline Report,
Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are presented in Attachment 13-12,
Fostmining Drainage and Sediment Control ,Table 13-12.1. Values were adapted from Urban Hydrology for Small
Watersheds, Technics! Release No. 55, Soil Conservation Service, 1986.
•
SEDCAD 4
Structure 4 - SWS1
Watershed W-16 (YPIV
5edimentoiogy: k factor
HYDROLOGIC SOIL
kFACTOR AREA (ac
SOILS MAP UNIT/SOILS SERIES GROUP 0 32 16.16
Reclaimed B
B
0.37
0.4
X8D/E/F - Winevada - Splitro complex 0 19 1.6
35C/D - Aaberg clay _ D 18.1
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 sail erodibility
factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2.

TR-37
13-3A.1-A.28
Revised 02/08