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

•
r~
Yoast Mir1z;
Pond 012I012A System
HYDROLOGIC INPUT P~ARAtb!1ET~RS
SEDCAD 4
~/ Channel YPM-1-3
Watershed ID -Structure 5 - SWS1
West side subwatershed
Ulatershed Area: 9.5
Curve Number:
HYDROLOGIC
CURVE
AREF
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acre:

Reclaimed Fair 30% - 70%
( ) 8 71 6.28
>70%
d B 30 3.23
Aspen/Mountain Shrub )
(
Goo 9.51
Total
CURVE NUMBER 57
SEDCAD 4
Channel YPM-1-3
ed ID -Structure 5 -
tology: k factor ARE!
MAP UNIT/SOILS
HYDROLOGIC SOIL GROUP
k FACTOR acre:
(
SERIES
32
0 g 28
d B
B .
0.23 3.2
F - Winevada loam g 5
.Total
Weighted k Factor 0.29
•
13-12.1-179 Revised 08108
' TR-37
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 Smal! Watersheds, Technical Release No. 55, Soil Conservation Service,
1986.