HYDRO22536

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/25/1994
• Doc Name: 1st Qtr 1994 Inspections
• From: PEABODY WESTERN
• 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: Dennis Jones DATE: 03/22/94
NPDES I.D. NO.: CO-0000221 D.P. 003
FACILITY CONFIGURATION: Diked Pond DATE LAST INSPECTION: 12/20/93
SITE NAME: Northwest Impoundment #003 LOCATION: SEA SW~, Sec. 27, T6N, R87W
MINE NAME: Seneca Mine (Peabody Coal Col LOCATION: 7.1 mi. SE of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-005-80 OWNER'S REP.: Scott Williams, Supt.
Circle or Write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yesi No N/A
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: ~Y~s: No N/A
4. Burning (specify extent and location): Yes L Nod N/A
5. Angle of slope: 2:1 upstream, 3:1 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 GNoJ N/A
At natural hillside: Yes CND N/A
Over widespread areas: Yes Qlo7 N/A
From downstream foundation area: Yes ~Np N/A
"Boils" beneath stream or ponded water: Yes Cfl97 N/A
7. Cracks or scarps on crest: Yes ~NS~ N/A
8. Cracks or scarps on slope: Yes ~ N/A
9. Sloughing or bulging on slope: Yes ~ N/A
10. "Major erosion problems: Yes ~ N/A
11. Surface movements in valley bottom or On hillside: Yes ~ N/A
12. "Erosion of toe: Yes ~) N/A
13. *Water impounded against toe: Yes No N/A
19. Existing embankment freeboard: 4.8 feet
15. Increase Decrease in water level: No change feet
16. Cracks, bulging, or erosion on upstream face: Yes to N/A
17. Visible sumps or sinkholes in slurry surface: Yes No ~,~
18. •Clogging
Spillway channels and pipes: Yes Rio N/A_
Decant system: Yes No Qom.
Diversion ditches: Yes ~~ N/A
19. Cracking or crushing of pipes
Spillway pipes: Yes ~~o N/A
Decant system: Yes No
20. Trash racks clear and in place: ~Ye~ 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.