HYDRO23595

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 4/6/1992
• Doc Name: QTRLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: PEABODY COAL CO WESTERN DIV
• 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: 03/18/92
NPDES I.D. NO.: CO-0000221 D.P. 006
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #006 LOCATION: NWg,NW;, Sec.2 ,T N,R88W
MINE NAME: Seneca Mine II-W Peabody Coa Co 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, topsail): _ es No NJA
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: es No N/A
4. Burning (specify extent and location): Yes 0 N/A
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No N®
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 ® N/A
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps on crest: Yes ~o N/A
8. Cracks or scarps on slope: Yes No NIA
9. Sloughing or bulging on slope: Yes No N/A
10. *Major erosion problems: Yes ~o N/A
11. Surface movements in valley bottom or on hillside: Yes No N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: ~0•i feet
15. X Increase Decrease in water level: 2.0 feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: Yes No N/A
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system: Yes No
Diversion ditches: Yes No ~NjA~
19. *Cracking or crushing of pipes
Spillway pipes: Ves No N A
Decant system: Yes o /A
20. Trash racks clear and in place: Yes No N/A
*Major adverse changes in these items could cause instability and sho uld be reported t o the
Engineering Manager and Mine Superintendent for further evaluation. Adverse condition s
noted in these items should normally be described (extent, location, volume, etc .) in the
space on the back of this sheet.