2008-01-16_PERMIT FILE - C1994082A ‎(2)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2008
• Doc Name: Sediment Ponds SEDCAD4 Results
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1
• Media Type: D
• Archive: Yes

Yoast Mine
Pond 12A Design
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel YPM-1-3
Watershed ID -Structure 5 - SWS1
Watershed Area: 9.5
West side subwatershed
Sedimentology: k Factor and Control Factor
HYDROLOGIC CONTROL AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP k FACTOR FACTOR (acres)
Reclaimed Fair (30% - 70%) B 0.16 0.043 6.28
Aspen/Mountain Brush Good (>70%) C 0.37 0.042 3.23
Total 9.5
0.23 0.043
•
SEDCAD 4
Channel YPM-1-3
Watershed ID -Structure 5 - SWS2
Watershed Area:
11.6
Sedimentology: k Factor and Control Factor
HYDROLOGIC CONTROL AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP k FACTOR FACTOR (acres)
Reclaimed Fair (30% - 70%) B 0.16 0.043 8.8
Reclaimed Topsoiled, No Vegetation B 0.16 1.0 1.7
Sagebrush Good (>70%) C 0.19 0.042 1.1
Tota I 11.6
0.16 0.18
Undisturbed vegetation information taken from Exhibit 10-1, Premining Vegetation Map. Hydrologic soil group values based
on soil types which were taken from Exhibit 9-1, Soils Type and Soils Salvage Map. Disturbed area vegetation information
(Reclaimed: vegetated, fair [30% - 70%]; or, topsoiled, no vegetation) taken from 2006 Annual Reclamation Chronological
Seeding Map (Yoast Mine 2006 Annual Reclamation Report). Field observations as of June 2007 indicate areas seeded in
2006 display good stand establishment and growth. Approved Yoast Mine "k" Factor and Control Factor values are
presented in Appendix 13-12, Postmining Drainage and Sediment Control, Tables 13-12.2 and 13-12.3, respectively.
•
TR-36
13-12.1-69
Revised 08/07