2007-11-30_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundment-s7
INSPECTOR'S NAME: Dennis Jones DATE: 'Q ~~~ ~~ r
NPDES I.D. NO.: CO-0000221 D.P. 009 Q ^/ 2 _®
_
FACIL ITY CONFIGURATION: Cross-Valley Pond 6 6
DATE LAST INSPECTION:
SITE NAME: Pond #009 LOCATION: SE1/ SW1/ Sec 11 T5N 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.: Greaa Kitchen, Gen Mqr
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: 3:1 upstream, 3:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: N A
Yes
No
N/A
At isolated points on embankment slopes:
At natural hillside: Yes No N/A
Over widespread.areas: Yes
Yes No
No N/A
N/A
From downstream foundation area: N N/A
"Boils" beneath stream or ponded water: Yes o
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
L N N/A
14. Existing embankment freeboard: (normal = 6.9') D feet
15. _ Increase Decrease in water level: Vlo c~n~. feet
16. Cracks, bulging, or erosion on upstream face: Yes ~f~o~ N/A
17. Visible sumps or sinkholes in slurry surface: N A
18. *Clogging
Yes
~
N/A
Spillway channels and pipes:
Decant system:
NL
Diversion ditches:
19. *Cracking or crushing of pipes
Yes
No
N/A
Spillway pipes:
Decant system:
es
No
N/A
20. Trash racks clear and in lace:
21. Discharge rate (gpm) LJ~-~'w l~Q~s~ 3-~~p~~ ~e_ p
~ota7 GLISc~~4Y ~lL
*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.