HYDRO20108

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 1/30/1998
• 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: Mi >,a 7 Al avi77a DATE: 12/22/97
NPDES I.D. NO.: CO-0000221 D.P. 005
FACILITY CONFIGURATION: Crone-Valley Pond DATE LAST INSPECTION: 09/23/97
SITE NAME: Pond #005 LOCATION: NWT SW~ Sec. 10 TSN R88W
MINE NAME: S n a TT-W Min (Seneca Coal Col LOCATION: B mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Brad Brown, ce^ Mgr
1. Foundation preparation (removal of vegetation, stumps, topsoil: ~ No N/A
2. Lift thickness: ~2- in. N/A
3. Compaction according to approved plan: Yes No N/A
4. Burning (specify extent and location): Yes No
5. Angle of slope: 3.5:1 upstream, 2.5:1 downstream Total = 6:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yee No A
At isolated points on embankment slopes: Yes ®o N A
At natural hillside: Yes o N/A
Over widespread areas: Yes o N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water: Yes o N/A
7. Cracks or scarps on treat: Yes ~ N/A
8. Cracks or scarps on elope: Yes ~ N/A
9. Sloughing or bulging on slope; Yee N/A
10. *Major erosion problems: Yea ~
o N/A
11. Surface movements in valley bottom or on hillside: Yes N/A
12. *Eroeion of toe: Yes N/A
13. *Water impounded against toe: Yes ~
N N/A
14. Existing embankment freeboard: A~nroximatel~ 7.5 feet
15. Increase ~ Decrease in water level: O.7 feet
16. Cracks, bulging, or erosion on upstream face: Yes ©o N/A
17. Visible sumps or sinkholes in Blurry surface: Yes No N A
18. *clogging
Spillway channels and pipes: Yee ® N A
Decant system: Yea No
Diversion ditches: Yes ®o N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yee ® N A
Decant system: Yee No
20. Trash racks clear and in place: ® 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 apace on
the back of this sheet.