HYDRO25065

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/1993
• Doc Name: 1st Qtr 1993 Inspections
• From: PEABODY WESTERN
• To: MLRD
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PHRIODIC INSPECTION FORH
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Tom Wainwright DATE: 03/18/93
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Final Pit Impoundment DATE LAST INSPECTION: 12/14/92
SITE NAME: PeCOCO Reservoir LOCATION: NWk, Sec. 2, T6N, R87W
MINE NAME: Seneca Mine (Peabody Coal Co.) LOCATION: 7.1 mi. SE of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Scott Williams, Supt.
Circle or write in aoprooriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yee No
2. Lift thickness: inches
3. Compaction according to approved plan: es No
4. Burning (specify extent and location): Yes
5. Angle of slope (degrees) degrees
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes o
At isolated points on embankment elopes: Yee No
At natural hillside: Yes No
Over widespread areas: Yes
From downstream foundation area: Yee o
"Boils" beneath stream or ponded water: Yes o
7. Cracks or scarps on crest: Yee ®o
8. Cracks or scarps on slope: Yes No
9. Sloughing or bulging on elope: Yee Q
10. *Major erosion problems: Yes
11. Surface movements in valley bottom or on hillside: Yea
12. *Eroaion of toe: Yee No
13. *Water impounded against toe: Yes
14. Existing embankment freeboard: 5 feet
15. Increase Decrease in water level: Same feet
16. Cracks, bulging, or erosion on upstream face: Yes No
17. Visible sumps or sinkholes in slurry surface: Yes No
18. *Clogging
Spillway channels and pipes: Yes Q
Decant system: Yes Q
Diversion ditches: Yee
19. *Cracking or crushing of pipes
Spillway pipes: Yes Nno
Decant system: Yes
20. Trash racks clear and in place: Yee No
*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 apace on
the back of this sheet.