HYDRO28084

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 12/6/1999
• Doc Name: 3rd Qtr 1999 Inspections
• 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: Michael Altavilla DATE: 09/22/99
NPDES I.D. NO.: CO-0000221 ^.P. 003
FACILITY CONFIGURATION: Diked Pond DATE LAST INSPECTION: 06/3099
SITE NAME: Nprthwest IQipo ,n m n #003 LOCATION: SRS{ cWk Sec. 27 T6N. RB7W
MINE NAME: Aen a 1T M;n (Seneca Coal Col LOCATION: 7.1 mi_ SF. of Hayden. CO
MINE I.D. NO.: CMl.Rn Permit No. C-80-005 OWNER'S REP.: Brad Arown, Gen Mgr-
1. Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
2. Lift thickness: 1Z in. N/A

3. Compaction according to approved plan: Yes No N/A
4. Burning (specify extent and location): Yes No
5. Angle of elope: 2:1 upstream, 3el downstream Total = 5:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No
At isolated points on embankment slopes: Yes ® A
At natural hillside: Yee o N/A
Over widespread areas: Yes o N/A
From downstream foundation area: Yes N/A
"Boils" beneath stream or ponded water: Yee N N/A
7. Cracks or ecarpe on crest: Yes ~ N/A
H. Cracks or ecarpe on elope: Yee N N/A
9. Sloughing or bulging on elope: Yee No N/A
10. *Major erosion problems: Yes No N/A
11. Surface movements in valley bottom or on hillside: Yes ® N/A
12. *Eroeion of toe: Yee ,,,1
~ N/A
13. *Water impounded against toe: Yee o N/A
14. Existing embankment freeboard: see comments 4.9 feet
15. Increase Decrease in water level: No change feet
16. Cracks, bulging, or erosion on upstream face: Yes ® N/A
17. Visible sumps or sinkholes in slurry surface: Yee No N A
18. *Clogging
Spillway channels and pipes: Yee Nb N
Decant a stem:
Y Yes
/
Diversion ditches: Yee ~
N A
19. *Cracking or crushing of pipes
Spillway pipes: Yes ~ N A
Decant system: Yee No /
20. Trash racks clear and in place: ee 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.