PERMFILE56724

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 9/27/2007
• Doc Name: 10-Year, 24 Hour SEDCAD Demonstration
• Section_Exhibit Name: Tab 13 Attachment 13-3A.2 Addendum 13-3A-A
• Media Type: D
• Archive: No

YOAST MINE
Pond 10 -Watershed W-15
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 7 - SWS1
Watershed W-15 {YPM-15)
Watershed Area;
13.0
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER acres
Aspen/Mountain Brush Gcod (>70%) C 41 7.12
Reclaimed Fair (30%<x<70%) B 71 2.57
Spoil Bare C 66 3,34
Tota! 13.0
CURVE NUMBER 58
Curve number (CN) values used are approved Yoast Mine values (see Table 13-12.1). Values were
adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR-55J ,Soil Conservation
Service, 1986.
SEDCAD 4
• WATERSHED ID
Structure 7 - SWS1
Watershed W-15 (YPM-15)
Watershed Area:
13.0
Sedimentology
k Factor and Control Factor:
VEGETATION HYDROLOGIC k CONTROL AREA
WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR acres
Aspen/Mountain Brush Good (>70%) C 0.24 0.042 7.12
Reclaimed Fair (30%<x<70%) B 0.16 0.043 2.57
Spoil Bare C 0.16 1.0 3.34
Total 13.0
020 0.29

TR-35 13-3A-A.26 Revised 08/07