HYDRO30603

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 4/2/2007
• Doc Name: 1st Quarter 2007 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DRMS
• 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: 3' ~ '~
NPDES I.D. NO.: CO-0000221 D.P. 010
FACILITY CONFIGURATION: Cross-Vallev Pond DATE LAST INSPECTION: ~'~~~'~'
SITE NAME: Pond #010 LOCATION: NW'/. NE`/, Sec. 8. TSN, R87W
MINE NAME: Yoast Mine (Seneca Coal Co) LOCATION: 8.5 mi. SE of Hayden CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Greaa Kitchen. Gen Mar
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 8 in.
3. Compaction according to approved plan: Ye s
4. Burning (specify extent and location): No
5. Angle of slope: 3.75:1 upstream, 3.75:1 downstream Total = 7. 5:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No N/A
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. *Maj or 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 = 10.0' [O•d feet
15. Increase Decrease in water level: ~'1c.1 e Q~~ _ feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry s urface:
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system: NL
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system:
20. Trash racks clear and in place: es No N/A
*Maj or 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.