HYDRO29885

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 12/6/1999
• 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: Micha t At avilta DATE: 09/23/99
NPDES I.D. NO.: _0-0000 221 ^.P. Dtc
FACILITY CONFIGURATION: C ross-Valley Pond DATE LAST INSPECTION: N/A
SITE NAME: Pond X015 LOCATION: NEB SEQ. Sec_ 23 T5N RBBW
MINE NAME: Seneca it'-W Mi ne ~ceneca Coat_ Cot LOCATION: 8 mi_ S of Hayden CO
MINE I.D. NO.: -MT.R17 PPrm l No. --8 -DS7 OWNER'S REP.: Brad Brown, Gen Mqr
1. Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
2. Lift thickness: ~_ in. N/A
3. Compaction according to approved plan: ea No N/A
4. Burning (specify extent and location): Yes No
5. Angle of elope: 2.5:1 upstream, 3.5:1 downstream Total = 6.1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yee No
At isolated points on embankment slopes: Yes N/A
At natural hillside: Yes ~
o N/A
Over widespread areas: Yes N/A
From downstream foundation area: Yes ~
o N/A
"Boils" beneath stream or ponded water: Yes ~ N/A
7. Cr acke or scarps on ereet: Yea 91~0~
~ N/A
8. Cracks or scarps on elope: Yee i~~l N/A
9. Sloughing or bulging on slope: Yee ~ N/A
10. *Major erosion problems: Yes ~ 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 ~
o N/A
14. Existing embankment freeboard: ~~nroximatel~ tt.D feet
15. ~_ Increase Decrease in water level: 6.0 feet
16. Cracks, bulging, or erosion on upstream face: Yee ~ N/A
17. visible sumps or sinkholes in slurry surface: Yea No /A
18. *Clogging
Spillway channels and pipes: Yes ~ N A
Decant system: Yea No
Diversion ditches: Yee No N/
19. *Crackinq or crushing of pipes
Spillway pipes: Yes ~ N A
Decant system: Yes No /A
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.