HYDRO22881

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 10/5/2007
• Doc Name: 3rd Quarter 2007 Sedimentation 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
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INSPECTOR 'S NAME: Dennis Jones DATE: ~
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NPDES I .D . NO.: CO-0000221 D. P. 017 /_ / {~ ~ O
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: Q u
SITE NAME : Pond #017 LOCATION: SW'/, NE'/., Sec. 34 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.: Gre44 Kitchen, Gen Mar
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 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 = 61
6. 'Seepage (specify location, color, and approximate volume)
From underdrain pipes: N A
At isolated points on embankment slopes: Yes o
At natural hillside: Yes No
Over widespread areas: Yes
From downstream foundation area: 5 6. es No
"Boils" beneath stream or ponded water: Yes No
7. Cracks or scarps on crest: Yes No
8. Cracks or scarps on slope: Yes No
9. Sloughing or bulging on slope: Yes No
10. 'Major erosion problems: Yes No
11. Surface movements in valley bottom or on hillside: Yes No
12. 'Erosion of toe: Yes No
13. 'Water impounded against toe: Yes o
14. Existing embankment f eeboard: (normal = 3.1') ~~ feet
15. Increase Decrease in water level: ~• ~ feet
16. Cracks, bulging, or erosion on upstream face: Yes
17. Visible sumps or sinkholes in slurry surface: N A
18. 'Clogging
Spillway channels and pipes: Yes
Decant system: N A
Diversion ditches:
19. 'Cracking or crushing of pipes
Spillway pipes: Yes No
Decant system: N A
20. Trash racks clear and in
place: Yew No
21. ~`
_1
Discharge rate (gpm) {uc~p~2V, IQU£., ~ 7t4 be lo w cP:Scl~~oy ~
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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.