2010-12-22_HYDROLOGY - C2009087 ‎(2)‎

• Permit No: C2009087
• IBM Index Class Name: HYDROLOGY
• Doc Date: 12/22/2010
• Doc Name: 4th Quarter 2010 Sedimentation Pond Report
• From: Peabody Energy
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: JDM
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE:
NPDES I.D. NO.: CO-0048275 D.P. 004 ?j
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: South Section 12 Pond #004 LOCATION: SWV4 SEV4, Sec. 12, TSN, R87W
MINE NAME: Peabody Sage Creek Mine LOCATION: 7.1 mi. SE of Hayden, CO
MINE I.D. NO.: CDRMS Permit No. C-2009-087 OWNER'S REP.: Mike Ludlow
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 5:1 upstream, 2:1 downstream Total = 7:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes N/A
At natural hillside: Yes n N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps on crest: Yes No N/A
8. Cracks or scarps on slope: Yes No N/A
9. Sloughing or bulging on slope: Yes No N/A
10. *Major erosion problems: Yes No N/A
il. Surface movements in valley bottom or on hillside: Yes No N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Yes o N/A
14. Existing embankment freeboard: (normal = 4.81) ` feet
15. Increase Decrease in water level: K'Z c?.CL c,2 feet
16. Cracks, bulging, or erosion on upstream face: Yes N N/A
17. Visible sumps or sinkholes in-slurry surface: N/A
18. *Clogging
Spillway channels and pipes:
Yes
Inb
N/A
Decant system: Inoperable YAR No N/A
Diversion ditches: Yes No N/A
19. *Cracking or crushing of pipes
N/A
Spillway pipes: Yes

20. Decant system: Inoperable
Trash racks clear and in place: Yes Die
es No D;4_
N/A
3 4
21. Discharge rate (gpm)
*Major adverse changes in these items could cause instability and should be reported to the
Engineering Manager and Mine Superintendent for further evaluation. Adverse conditions noted in
these items should normally be described (extent, location, volume, etc.) in the space on the
back of this sheet.
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