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
•
r
L
SEDCAD 4
SEDCAD 4
Structure 21
PECOCO Pond Spoil Spring Inflow
WATERSHED ID
Watershed Area:
n/a
Structure 21 - SWS1
WATERSHED TYPE
GROUND COVER
PECOCO Pond
NUMBER
(acres)
Operational Conditions Design
n/a
Watershed Area:
na/
n/a
9.9
Curve Number:
n/a
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Sage Brush
Fair (30 - 70 %)
C
63
3.1
Reclaim >3 years
Good ( >70 %)
B
62
6.80
Total
CURVE NUMBER
100
9.9
CURVE NUMBER
62
SEDCAD 4
SEDCAD 4
Structure 21
PECOCO Pond Spoil Spring Inflow
WATERSHED ID
Watershed Area:
n/a
Structure 21 - SWS2
WATERSHED TYPE
GROUND COVER
PECOCO Pond
NUMBER
(acres)
Operational Conditions Design
n/a
Watershed Area:
na/
n/a
2.1
Curve Number:
n/a
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Pond Surface
n/a
n/a
100
2.1
Total
2.1
CURVE NUMBER
100
SEDCAD 4
WATERSHED ID
Structure 21
PECOCO Pond Spoil Spring Inflow
Operational Conditions Design
Watershed Area:
n/a
Curve Number:
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Inflow
n/a
n/a
na/
n/a
Total
n/a
PECOCO Spoil Spring is the perennial discharge from the pond. The average flow rate for the
PECOCO discharge is 40 gpm (0.15 ac- ft/day). The permanent pool elevation for PECOCO
was set at 6775.65 feet as a model input value to account for the constant spoil spring inflow.
CURVE NUMBER n/a
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.
Revised 12/09
2.05.3 -E2.D -1.51