HYDRO20204

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/2002
• Doc Name: 1st Quarter 2002 Sediment Pond
• 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 Im7pou^n~dment~
SNSPECTOR'S NAME: Dennis Jones DATE: J ' of ~ - ~ Z
NPDES I.D. NO.: NL (''
~
FACILITY CONFIGURATION: Incised Pond DATE LAST INSPECTION: _ J -
SITE NAME: Truck Wash Sup p lv Pond LOCATION: NNPk NEB Sec 34 T6N R87W
MINE NAME: Seneca Mine IZ (Seneca Coal Co) LOCATION: 7.1 mi. SE of Hayden CO
MINE I.D. NO.: CDMG Permi t No. C-80-005 OWNER'S REP.: Grego Kitchen Gen Mgr
Circle or write in aporooriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Y~
2. Lift thickness: 12 inc hes
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 2:1 upstream, 2:1 downstream Total = 4:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: NSA
At isolated points on embankment slopes: Yes No 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 N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Y
e
s N N/A
14. Existing embankment freeboard: (normal = 2.7') ~
-
7
a`~ feet
15. Increase Decrease in water level: 4~u c~c.~ feet
16. Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. Visible sumps or sinkholes in slurry surface: ~A
18. *Clogging
Spillway channels and pipes: Yes /~So1 N/A
Decant system: N A ~~~~

Diversion ditches:
~ `
!/
N/A GJ/i
19. *Cracking or crushing of pipes /
Spillway pipes: Yes ~i11 N/A
Decant system: ~ ~~~
20. Trash racks clear and in place: NL
*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.