HYDRO29281

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 12/4/2006
• Doc Name: 4th Quarter 2006 Pond Inspection Report
• 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: IO 'I 3 ~~~
NPDES I.D . NO.: CO-0000221 D.P. 005 G
~~ D /
FACILITY CONFIGURATION: Cross-Valley Pond ^
DATE LAST INSPECTION: { '
O
SITE NAME : Pond #005 LOCATION: NWi/. 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.: Gregg Kitchen. Gen Mgr
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: 3.5:1 upstream, 2.5:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: es N/A
At isolated points on embankment slopes: es o N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
FYOm 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. Exist/ing embankment freeboard: (normal = 7.4') r{•~ feet
15. V Increase Decrease in water level: I. O feet
16. Cracks, bulging, or erosion on upstream face: es No N/A
17. Visible sumps or sinkholes in slurry surface: NL
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system: Yes No N/A
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: Yes No N/A
20. Trash racks clear and in place: es o 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 condition:> noted in
these items should normally be described (extent, location, volume, etc.) in the space on the
back of this sheet.