2008-10-24_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/24/2008
• Doc Name: 3rd Quarter 2008 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: L- z
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #012A LOCATION: NEIA NEB/a,Sec. 19, T5N, 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.: Roy Karo, 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: upstream, downstre am Total =
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. *Major erosion problems: Yes N N/A
11. Surface movements in valley bottom or on hillside: Yes N N/A
12. *Erosion of toe: Yes N N/A
13. *Water impounded against toe: Yes N/A
14. Existing embankment freeboard: ?t- n 4 'J ern iw bpi feet
15. Increase Decrease in wa?dr level: 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:
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: N/A
20. Trash racks clear and in place: Yeso N/A
21. Discharge rate (gpm)
*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.
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