HYDRO20204

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/2002
• Doc Name: 1st Quarter 2002 Sediment Pond
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

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PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Im2poun[dments
INSPECTOR'S NAME: Dennis Jones DATE: 3 -~CJ '~ Z
NPDES I.D. NO.: CO-0000221 D.P. 003
FACILITY CONFIGURATION: Diked Pond
SITE NAME: Northwest Impoundment #003
MINE NAME: Seneca TI Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-80-005
DATE LAST INSPECTION; II' S b
LOCATION: SE~/a SWi/a Sec. 27 T6N, R87W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Greaa Kitchen Gen Mar
Circle or write in aoorooriate resoonae
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: 2:1 upstream, 3:1 downstream Total = 5:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: N~
At isolated points on embankment slopes: Yes N N/A
At natural hillside: Yes N 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. *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. *Wa ter impounded against toe: Y
e
s N N/A
14. Existing embankment freeboard: normal 4.9' ~~
~
p
~•i feet
15. Increase Decrease in water level: LLB ~- ~^~ feet
__
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging

Spillway channels and pipes: Yes No N/A
Decant system: N/A
Diversion ditches: Yes No N/A
19. *Crac king or crushing of pipes

Spillway pipes: Yes No N/A
Decant system:
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.