HYDRO24911

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 1/12/1995
• Doc Name: QUARTERLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: PEABODY WESTERN COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PfiRIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: 12/09/94
NPDES I.D. NO.: CO-0000221 D.P. 005
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 09/23/94
SITE NAME: pond #005 LOCATION: NWY. SW~, Sec. 10. TSN. R88W
MINE NAME: Seneca II-W Mine (Seneca Coal Co) LOCATION: 8 mi. S of Hayden. CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Scott Williams. Gen Mar
Circle or write in aoorooriate reaoonse
1. Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: es No N/A
4. Burning (specify extent and location): Yes No /A
5. Angle of slope: 3.5:1 upstream, 2.5:1 downstream Total = 6:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes N/A
At isolated points on embankment slopes: Yes N/A
At natural hillside: Yes N N/A
Over widespread areas: Yes N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water: Yes N/A
7. Cracks or scarps on crest: Yes o N/A
8. Cracks or scarps on slope: Yes o N/A
9. Sloughing or bulging on slope: Yes o N/A
10. *Major erosion problems: Yes No N/A
11. Surface movements in valley bottom or on hillside: Yes N/A
12. *Erosion of toe: Yes ~
No N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: ADDrOX 19.5 feet
15. Increase X Decrease in water level: Aoorox. 2.5 feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: Yes No ~/A'
18. *Clogging
Spillway channels and pipes: Yes N/A
Decant system: Yes ~ N/A
Diversion ditches: Yes o N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes ~ N/A
Decant system: Yes o N/A
20. Trash racks clear and in place: es No N/A
*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.