2011-03-21_PERMIT FILE - C2009087A ‎(13)‎

• Permit No: C2009087A
• IBM Index Class Name: Permit File
• Doc Date: 3/21/2011
• Doc Name: Pond 002 10yr/24hr Storm Event
• Section_Exhibit Name: Exhibit 2.05.3-E2 Appendix 2.05.3-E2.A Addendum 2.05.3-E2.A-1
• Media Type: D
• Archive: Yes

Peabody Sage Creek Mine
Pond 002 System
HYDROLOGIC INPUT PARAMETERS
SEUCAD4
WATERSHED ID
Structure 5 - SWS1
Channel PM -7
rshed Area:
22.2
Curve Number:
HYDROLOGIC CURVE AREP
WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER (acres
Reclaim >3 years Good ( >70 %) B 62 22.20
Total I I 22.2
CURVE NUMBER 62
Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CORMS 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
WATERSHEDID
Structure 5 - SWS1
ershed Area: Channel PM -7
22.2
imentology: k Factor and Control Factor
VEGETATION
WATERSHED TYPE COVER
Reclaimed Good ( >70 %)
HYDROLOGIC
k
CONTROL
AREA
SOIL GROUP
k TOR
FACTOR
(acres
B
.24
0.043
22.2
Total
22.2
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 If 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.
TRO l -10 20.5.3 -E2 -A 1.77 12/10