HYDRO20274

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 10/13/1995
• Doc Name: QUARTERLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Rov Karo DATE: 09/25/95
NPDES I.D. NO.: CO-0000221 D.P. 006
FACILITY CONFIGURATION: Cross-Vallev Pond DATE LAST INSPECTION: 06/28/95
SITE NAME: Pond #006 LOCATION: NWY NWy. Sec. 22. T5N. R88W
MINE NAME: Seneca II-W Mine (Seneca Coal Col LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C~82-057 OWNER'S REP.: Scott Williams. Gen Mar
Circle or write in anorooriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: es No N/A
4. Burning (specify extent and location): Yes No /A
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No /A
At isolated points on embankment slopes: Yes N A
At natural hillside: Yes N/A
Over widespread areas: Yes N/A
From downstream foundation area: Yes N/A
"Boils" beneath stream or ponded water: Yes o N/A
7. Cracks or scarps on crest: Yes o N/A
8. Cracks or scarps on slope: Yes o N/A
9. Sloughing or bulging on slope: Yes o N/A
10. *Maj or erosion problems: Yes o N/A
11. Surface movements in valley bottom or on hillside: es No N/A
12. *Erosion of toe: Yes o N/A
13. *Water impounded against toe: Yes o N/A
14. Existing embankment freeboard: Aooroximately 10 Eeet
15. Increase Decrease in water level: No chance feet
16. Cracks, bulging, or erosion on upstream face: Yes ® N A
17. Visible sumps or sinkholes in slurry surface: Yes No
18. *Clogginq
Spillway channels and pipes: Yes
Decant system: Yes No
Diversion ditches: Yes No
19. *Crackinq or crushing of pipes
Spillway pipes: Yes Qo N/A
Decant system: Yes No
20. Trash racks clear and in place: es No 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 conditions noted
in these items should normally be described (extent, location, volume, etc.) in the space on
the back of this sheet.