HYDRO28451

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/1993
• Doc Name: QTRLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: PEABODY WESTERN COAL CO
• To: MLRD
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
' Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Tom Wainwright DATE: 03/18/93
NPDES I.D. NO.: CO-0000221 D.P. 005
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 12/07/92
SITE NAME: Pond #005 LOCATION: NW's SW~a, Sec. 10. T6N, R88W
MINE NAME: Seneca II-W Mine (Peabody Coal Co.l LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Scott Williams, Suot.
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes No N/A
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: Yes No N/A
4. Burning (specify extent and location): Yes No /A
5. Angle of elope: 3.4 upstream, 2.6 downstream Total = 6.1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yee ® N/A
At isolated points on embankment slopes: Yes N/A
At natural hillside: Yee ~ N/A
Over widespread areas: Yee No N/A
From downstream foundation area: Yee ~ N/A
"Boils" beneath stream or ponded water: Yes ® NJA
7. Cracks or scarps on crest: Yea No
B. Cracks or scarps on elope: Yee No N/A
9. Sloughing or bulging on elope: Yee No N/A
10. *Major erosion problems: Yea No N/A
11. Surface movements in valley bottom or on hillside: Yes No NJA
12. *Eroaion of toe: Yes ~ N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: 21.6 feet
15. X Increase Decrease in water level: See comments 1 feet
16. Cracks, bulging, or erosion on upet ream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: Yes No
18. *Clogging
Spillway channels and pipes: Yea ® N A
Decant system: Yes No N
Diversion ditches: Yes No
19. *Cracking or crushing of pipes
Spillway pipes: Yes ~j N A
Decant system: Yes No N/A
20. Trash racks clear and in place: Yes 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 space on
the back of this sheet.