HYDRO22498

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 12/4/2006
• Doc Name: 4th Quarter 2006 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments /~
INSPECTOR'S NAME: Dennis Jones DATE: ~ -~ v
NPDES I.D . NO.: N A ~- 2O- O6
FACILITY CONFIGURATION: Incised Pond DATE LAST INSPECTION:
SITE NAME : Truck Wash Sup ply Pond LOCATION: NW'/. NE'/„ Sec. 34 T6N, R87W
MINE NAME : Seneca Mine II (Seneca Coal Co) LOCATION: 7.1 mi. SE of Hay den, CO
MINE I.D. NO.: CDMG Permi t No. C-80-005 OWNER'S REP.: Gregg Kitchen Gen Mgr
C1 rCle Or write in apl)rODrlate reBDOn6e
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 inch es
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 2:1 upstream, 2:1 downstream Total = 4 :1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
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. *Erasion of toe: Yes No N/A
13. *Water impounded against toe: Yes N N/A
14. Existing embankment freeboard: (normal = 2.7') 3-~ eet
15. Increase ~ Decrease in water level: b•3 feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system:
Diversion ditches: Yes Igo N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system:
20. Trash racks clear and in place:
*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.