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

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TR-37
Yoast Kline
Pond 0121012A Syste~rt
HYDROLOGIC IiVPUT PARA~itETERS
SEDCAD 4
M-23
Channel YP
_
Watershed ID -Structure 13 - SWS1
Watershed Area: 11.0
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 1.91
Aspen/Mountain Shrub Good (>70%) B 30 3.38
Sagebrush Good {>70%) C 47 1.47
Disturbed No Vegetation
Topsoiled B 86 4.19
Total , 11.0
CURVE NUMBER 61
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
Channel YPM-23
Watershed ID -Structure 13 - SWS1
Sedimentology: k factor
SOILS MAP UNIT/SOILS HYDROLOGIC SOIL p`R~
SERIES GROUP k FACTOR (acres)
Reclaimed B 0.32 1.91
12ClD -Buckskin loam C 0.19 1.5
53C/D/E!F - Winevada loam B 0.23 3.4
il
d
T B 0.32 4.2
e
opso
Total 11.0
Weighted k Factor 0.27
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.
13-12.1-196
Revised 08!08