2008-12-04_PERMIT FILE - C1994082 ‎(20)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: 10 Year, 24 Hour SEDCAD Demonstration
• Section_Exhibit Name: Tab 13 Attachment 13-20.1 Appendix 13-20.1-A
• Media Type: D
• Archive: No

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Yoast Mine
Pond 013 Permanent Feattare Demonstration
HYDROLOGIC IVPl1T PARAMETERS
SEDCAD 4
Pond 013
Watershed ID -Structure 1
NJatershed Area: 0.8
Curve Number:
VEGETATION HYDROLOGIC
CURVE
AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 0.59
Aspen/Mountain Brush Fair (30% - 70%) D 63 0.1
Fair (30% - 70%) D 70 0.1
Sagebrush
Total 0.8
CURVE NUMBER 70
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
1-!„ilmrnrn, fnr Small watersheds. Technical Release No. 55, Soil Conservation Service, 1986.

Pond 013
Watershed ID -Structure 7 - SWS1
Sedimentology: k factor
AREA
HYDROLOGIC SOIL
SOILS MAP UNITJSOILS SERIES GROUP k FACTOR (acres)
Reclaimed B '0.32 0.59
35D/EJF - Aaberg clay D 0.19 0.2
l D 0.20 0.0
ex
103 - Ustorthents-Cryoboralls comp
Total 0.8
Weighted k Factor 0.29
Sails 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
e~„a;~:~~+., fnr4nr "k_Fartot~. values are presented in Attachment 13-12, Table 13-12.2.

Pond 013
Watershed ID -Structure 7 - SWS1
Sedimentology: Control Factor
CONTROL AREA
LAND USE CONDITION COVER TYPE VEGETATION FACTOR (acres)

Undistrubed As en/Mtn. Brush
p 25% canopy, 80%
ground cover 0 042 0.1

Sagebrush 25% canopy, 80% 0.042 0.1
ground cover
Reclaimed 60% ground cover 0.042 0.59
Reclaimed
Total 0.8
Weighted Control Factor 0.042
The Control Factor values are approved Yoast Mine values as presented in Attachment 13-12,.Table 13-12.3. The
values were originally presented in Renard, et al. (1997) Predicting Soil Erosion by Water. A Guide to Converation
Planning with the Revised Universal Soit Loss Equation (RUBLE), Agricultural Handbook 703, U.S. Department of
Agriculture as reported in Warner et al. (1998) as reported in Warner et al. (1998).
TR-37 13-20.1-A.19 Revised 02!08