2012-08-30_HYDROLOGY - C2009087

• Permit No: C2009087
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/30/2012
• Doc Name: 2nd Quarter 2012 Sedimentation Pond
• From: Peabody Sage Creek Mining, LLC
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO- 0048275 D.P. 003
FACILITY CONFIGURATION: Diked Pond
SITE NAME: Northwest Impoundment #003
MINE NAME: Peabody Sage Creek Mine
MINE I.D. NO.: CDRMS Permit No. C- 2009 -087
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
DATE: - G -
Circle or write in appropriate response
DATE LAST INSPECTION: f 9 - (Z-
LOCATION: SE'% SWl %, Sec. 27, T6N, R87W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Mike Ludlow
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 2:1 upstream, 3:1 downstream Total = 5:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes No N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes No 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
11. 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 N. N/A
14. Existing embankment freeboard: (normal = 4.9') 4 1. c feet
15. Increase Decrease in water level: Ku c L-cc64- feet
16. Cracks, bulging, or erosion on upstream face: Yes To) N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes: Yes 6TP N/A
Decant system: N/A
Diversion ditches: Yes N, N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes 69 N/A
Decant system: N/A
20. Trash racks clear and in place: / No N/A
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.