HYDRO31515

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 12/13/2004
• Doc Name: 4th Quarter 2004 Quarterly Sedimentation Pond Inspection Reports
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundme~Jnts
INSPECTOR'S NAME: Dennis Jones DATE: II'I' V I
NPDES I.D. NO.: CO-0000221 D.P. 003
FACILITY CONFIGURATION: Diked Pond
SITE NAME: Northwest Imnoundment #003
MINE NAME: Seneca II Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-80-005
DATE LAST INSPECTION: ~L ~~~ ~ 1
LOCATION: SE'/. SW~/., Sec. 27, T6N, R87W
LOCATION: 7.1 mi. SE of Havden, CO
OWNER'S REP.: Gregg Kitchen, Gen Mar
Circle or write in appropriate response
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 o N/A
At natural hillside: Yes o N/A
Over widespread areas: Yes o N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water: Yes o 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 o N/A
11. Surface movements in valley bottom or on hillside: Yes o N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Yes N/A
14. Existing embankment freeboard: (normal = 4.9') ~ feet
15. Increase Decrease in water level: 1no c~n4 as Il feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: N A
18. *Clogging
Spillway channels and pipes: Yes ACT N/A
Decant system:
Diversion ditches: Yes Np N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes ~ N/A
Decant system: NL
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.