HYDRO22916

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 10/23/1998
• 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 FORK
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Michael Altav;lla DATE: 09/2]/98
NPDES I.D. NO.: CO-0000221 D.P. 006
FACILITY CONFIGURATION: Croea-Valley Pnnd DATE LAST INSPECTION: 06/29/98
SITE NAME: Pond 1006/Pr -c tl'nq 8aein LOCATION: NW} NWT _c ec. 22 TSN R88W
MINE NAME: Seneca IT-W M'n !c n a -oal of LOCATION: 8 mi__ a of Hayden CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S AEP.: Brad Brown C-en Mqr
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
5. Angle of elope: 3:1 upstream, 3:1 downstream Total = 6:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yee No N A
At isolated points on embankment elopes: Yee o N/A
At natural hillside: Yee o N/A
Over widespread areas: Yes o N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water: Yee o N/A
7. Cracks or scarps on treat: Yee o N/A
8. Cracks or scarps on elope: Yee ~ N/A
9. Sloughing or bulging on elope: Yee ~ N/A
10. *Major erosion problems: Yee ® N/A
11. Surface movements in valley bottom or on hillside: Yes ® N/A
12. *Erosion of toe: Yes ®o N/A
13. *Water impounded against toe: Yes ® N/A
14. Existing embankment freeboard: Aooroximately 8.75 feet
15. ~ Increase Decrease in water level: 3.25 feet
16. Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. Visible sumps or sinkholes in slurry surface: Yes No N/A
18. *Clogging
Spillway channels and pipes: Yes ~ N A
Decant system: Yes No /A
Diversion ditches: Yes No N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N A
Decant eyetem: Yee No N
20. Trash racks clear and in place: Yes No ~~
*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.