HYDRO26471

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 12/30/1996
• Doc Name: 4th Qtr 1996 Sediment Pond 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 Impoundmen to
INSPECTOR' S NAME: Michael Altavilla DATE: 12/20/ 96
NPDES I.D. NO.: CO-0000221 D.P. 010
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 09/17/96
SITE NAME: Pond #010 LOCATION: NW'/. NEST. Sec. 8, TSN. R87W
MINE NAME: Yoast Mine(Seneca Coal Co) LOCATION: 8.5 mi. SE of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-94-062 OWNER'S REP.: Brad Brown. Gen Mar
Circle or write in aoorooriate reaoonee

1. Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
2. Lift thickness: 8 in. N/A
3. Compaction according to approved plan: es No N/A
4. Burning (specify extent and location): Yes No /A
5. Angle of slope: 3.75:1 upstream, 3.75:1 downstream Total = 7 .5:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes o N/A
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 N/A
"Boils" beneath stream or ponded water: Yes N/A
7. Cracks or scarps on crest: Yes o N/A
8. Cracks or scarps on slope: Yes o N/A
9. Sloughing or bulging on slope: Yes o N/A
10. •Maj or erosion problems: Yes o N/A
11. Surface movements in valley bottom or on hillside: Yes No N/A
12. •Erosion of toe: Yes N/A
13. 'Water impounded against toe: Yes N/A
14. Existing embankment freeboard: Ao oroximately 12.0 feet
15. X Increase Decrease in water level: 2.0 feet
16. Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. Visible sumps or sinkholes in slurry surface: Yes No
18. •Clogging
Spillway channels and pipes: Yes No N~A~
Decant system: Yes NQ ~7/P~
Diversion ditches: Yes 7~ N/A
19. •Cracking or crushing of pipes
Spillway pipes: Yes /fo1 N/A
Decant system: Yes o (~
20. Trash racks clear and in place: Yes No `~L T~1
*Maj or 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.