2008-12-04_PERMIT FILE - C1994082 ‎(10)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Pond 012 and Pond 012A Two-Pond System Design ‎(Pgs 13-12.1-149 to 13-12.1-225)‎
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1 Part 2
• Media Type: D
• Archive: No

•
~/
:ershed Area:
ve Number:
WATERSHED TYPE
Reclaimed
Aspen/Mountain Shrub
Sagebrush
Total
Yoast Nline
Pond 012l012A System
HYDRt7l.OGiC INPUT PARAMETERS
SEDCAD 4
Channel YPM-1-1
Watershed ID -Structure 1 - SWS1
54.2
VEGETATION COVER
Fair (30% - 70%)
Good (>70%)
Good(>70%)
SOIL GROUP NUMBER (acres
B 71 51.1
C 41 2.4
C 47 0.7
54.2
CURVE NUMBER 69
•
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 Hydrooogy for Sma/! Watersheds, Technicai Release No. 55, Soil Conservation
Service, 1986.
SEDCAD4
Channel YPM-1-1
Watershed ID -Structure 1 -
S MAP UNIT/SOILS HYDROLOGIC SOIL (acres'
.
SERIES GROUP k FACTOR
10
51
B 0.32 .
ned
C
0.24 3.1
- Splitro loam 54.2
Total
Weighted k Factor _0.32
•
TR-37
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.
13-12.1-173
Revised 08108