PERMFILE45602

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 2/28/2006
• Doc Name: Postmining Channels SEDCAD4 YPM-1 to YPM-6A
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.3
• Media Type: D
• Archive: Yes

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YOAST POSTMINE CHANNEL 6-1
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
SW S1
Watershed Area:
5.4 acres
Curve Number;
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Sagebrush Good (>70%} D 55 4.67
Aspen/Mountain Brush Good (>70%) D 48 0.71
Total 5.39
CURVE NUMBER 54
SEDCAD 4
WATERSHED ID
SWS2
Watershed Area:
8.3 acres
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER {acres)
AspenlMountain Brush Good (>70%) D 48 8.33
Total 8.33
CURVE NUMBER 48
SEDCAD 4
WATERSHED ID
SW S3
Watershed Area:
29.0 acres
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair B 71 25.71
AspenlMountain Brush Good (>70%) D 48 3.28
Total 28.99
CURVE NUMBER 63