HYDRO20860

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/28/2003
• Doc Name: 1st Quarter 2003 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Plater, Sediment, or Slurry Impou-nldment~
INSPECTOR'S NAME: Dennis Jones DATE: 3 'I 1-O~
NPDES I.D. NO.: CO-0000221 D.P. 003
FACILITY CONFIGURATION: Diked Pond
SITE NAME: Northwest Imnoundment #003
MINE NAME: Seneca IZ Mine (Seneca Coal Co)
MINE Z.D. NO.: CMLRD Permit No. C-80-005
DATE LAST INSPECTION: I'~ I3 ' ~ ~^
LOCATION: SEA SWYa, Sec. 27, T6N, R87W
LOCATION: 7.1 mi. SE of Havden, CO
OWNER'S REP.: Gregg Kitchen, Gen Mgr
Circle Or Write in HAAIODr18te reBDOIISe
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 2:1 upstream, 3:1 downstream Total = 5:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: 1A
At isolated points on embankment slopes: Yes o N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes No N/A
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps on crest: Yes No N/A
8. Cracks or scarps on slope: Yes No N/A
9. Sloughing or bulging on slope: Yes No N/A
10. *Major erosion problems: Yes No N/A
11. Surface movements in valley bottom or on hillside: Yes No NJA
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Y
e
s N N/A
14. Existing embankment freeboard: (normal = 4.9'1 ~
~
c
r
~•~ feet
15. Increase Decrease in water level : I 1b c 4~. My Q feet
16. Cracks, bulging, or erosion on upstream face: Yes ©o N/A
17. Visible sumps or sinkholes in slurry surface: ~A
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system:
Diversion ditches: Yes No N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes ~ N/A
Decant system:
20. Trash racks clear and in place: es 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.