HYDRO30065

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 7/31/2006
• Doc Name: 2nd Quarter 2006 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry I
mpo
undments
' /
l
6 '1 5 ~~
INSPECTOR S NAME: Dennis Sones DATE:
NPDES I.D. NO.: CO-0000221 D.P. 017 ~
~
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTI ~I
ON: I`
~"D
SITE NAME: Pond #017 LOCATION: SW~/. NEB/„ Sec. 34, T5N, R88W
MINE NAME: Seneca II-W Mine (Seneca Coal Co ) LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Grec o Kitchen, Gen Mar
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6_1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes: Yes N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes o N/A
^BOils" beneath stream or ponde
d water: Yes o N/A
7. n
Cracks or scarps on crest: SL~n.c.~ lYVa Sd:~ G4oc- S Ye No N/A
8. Cracks or scarps on slope: Yes o N/A
9. Sloughing or bulging on slope: Yes o N/A
10. *Major erosion problems: Yes No 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: Ye s o N/A
14. Existing embankment freeboard: (normal = 3.1') ~
'
~•~ feet
15. Increase Decrease in water level: feet
16. Cracks, bulging, or erosion on upstream face: Yes ©o N/A
17. Visible sumps or sinkholes in slurry surface: N A
18. *Clogging
Spillway channels and pipes: Yes /+~a N/A
Decant system: ~ ~..JJ
Diversion ditches: NL
19. *Cracking or crushing of pipes
Spillway pipes: Yes ©o N/A
Decant system: N A
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.