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

C7
~/
Yoas# i~ilirle
Pond 0~121032A Sys#em
HYDROLOGIC iNPUT PARAMETERS
SEDCAD 4
Channel YPM-6-3
Watershed ID -Structure 12 - SWS1
Uatershed Area: 25.7
Curve Number:
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 12.4

Aspen/Mountain Shrub Good >70% B
( ) 30 0.99
Steep Mountain Brush Fair (0% - 70%) D 73 1.80
Sagebrush Good (>70%) D 48 0.74
Wheatgrass/Alkali Sagebrush
W Gcod {>70%) D 85 1.10
.
Disturbed Topsoiled, No Vegetation B 86 8.67
25.7
Total
CURVE NUMBER 75
•
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, Technics! Release No. 55, Soil Conservation Service, 1986.
SEDCAD 4
Channel YPM-6-3
Watershed ID -Structure 12 - SWS1
Sedimentology: k factor AREA
HYDROLOGIC SOIL
SOILS MAP UNITISOILS SERIES GROUP k FACTOR (acres)
B 0.32 12 40
Reclaimed g 0.37 0.7
XSDlE/F -Winevada - Splitro complex
11ClD - Binco clay loam
p
0.24
0.4
p 0.19 1.5
35ClD/E - Aaberg clay 3
0
53C/D!E/F -Winevada loam B 0'23 .
8
1
103 - Ustorthents-Cryoborolls complex
p
0.20
.
g 0.32 8.7
Topsoiled 25 7
Total
Weighted k Factor 0.30
Soils series information from Yoast Mine Permit Application Package (see Tab 9, Sail 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.

Revised 08108
TR-37
13-12.1-194