2010-05-07_PERMIT FILE - C2009087A ‎(31)‎

• Permit No: C2009087A
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: 10 Year, 24 Hour SEDCAD Demonstration
• Section_Exhibit Name: Exhibit 2.05.3-E2 Appendix 2.05.3-E2.D Addendum 2.05.3-E2.D-1
• Media Type: D
• Archive: Yes

Peabody Sage Creek Mine
PECOCO Pond Design
HYDROLOGIC INPUT PARAMETERS
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Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the
Seneca II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming
Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55),
Soil Conservation Service, 1986.
SEDCAD 4
SEDCAD 4
WATERSHED ID
Structure 1 - SWS1
Structure 1 - SWS1
Channel PM -6a
Watershed Area:
16.3
Watershed Area:
Curve Number:
16.3
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Reclaim >3 years
Good ( >70 %)
B
62
16.30
Total
FACTOR
FACTOR
acres
Reclaimed
16.3
B
CURVE NUMBER
62
Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the
Seneca II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming
Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55),
Soil Conservation Service, 1986.
SEDCAD 4
WATERSHED ID
Structure 1 - SWS1
Channel PM -6a
Watershed Area:
16.3
Sedimentology: k Factor and Control Factor
VEGETATION
HYDROLOGIC
k
CONTROL
AREA
WATERSHED TYPE
COVER
SOIL GROUP
FACTOR
FACTOR
acres
Reclaimed
Good ( >70 %)
B
0.24
0.043
16.3
Total
1
1 16.3
0.24
0.043
The soil erodibility factor, "k- Factor", values were determined based on Seneca II soil survey information (see Tab 9,
Exhibit 9 -1, Soil Type and Sampling Locations, and Attachment 9 -6 of the Seneca II Mine PAP) as presented in Soils of
Colorado, Loss Factors and Erodibility, Soil Conservation Service, 1983.
The Control Factor values were adapted from Seneca Coal Company mine permit application packages. They are
representative of regional conditions and previously approved by CDRMS in the Seneca II Mine PAP, Permit C -80 -003.
The values are based on Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., McCool, D.K., and D.C. Yoder,
coordinators, 1996. Predicting Soil Erosion by Water. A Guide to Converation Planning with the Revised Universal Soil
Loss Equation (RUSLE) . Agricultural Handbook 703. U.S. Department of Agriculture.
2.05.3 -E2.D -1.30
Revised 12/09