HYDRO29671

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 7/26/2004
• Doc Name: 2nd Quarter 2004 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
9Qater, Sediment, or Slurry ia~m`oundmenta
INSPECTOR'S NAME: Dennis Jones DATE: J ' G '~
NPDES I.D. NO.: CO-0000221 D.P. 004
FACILITY CONFIGURATION: Cross-Valley Pond
SZTE NAME: South Section 12 Pond #004
MINE NAME: Seneca IZ Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-80-005
DATE LAST INSPECTION: J ' O ~ 0 L~
LOCATION: SWYa SEA, Sec. 12. TSN, R87W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Greaa Kitchen. Gen Mar
Circle or write in aoDrovriate reaaonae
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12
3. Compaction according to approved plan: Yes _
4. Burning (specify extent and location): No
5. Angle of slope: 5:1 upstream, 2:1 downstream Total = 7:1
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 No 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 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') feet
15. Increase Decrease in water level: feet
16. Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging

Spillway channels and pipes: Yes No N/A
Decant system: Yes No N/A
Diversion ditches: Yes No N/A
19. *Cracking or crushing of pipes
Spillway pipes: Y s No N/A
Decant system: es No N/A
20. Trash racks clear and in place: Yes 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.