HYDRO21860

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/29/2004
• Doc Name: 1st Quarter 2004 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

' PERIODIC INSPBCTION FORM
Water, Sediment, or Slurry Impoundments
.INSPECTOR'S NAME: Dennis Jones DATE: ~ •'~"~
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Incised Pond
SITE NAME: Truck Wash Supply Pond
MINE NAME: Seneca Mine II (Seneca Coal Co)
MINE I.D. NO.: CDMG Permit No. C-80-005
DATE LAST INSPECTION: ID -~~~ O
LOCATION: NWT/. NE'/,, Sec. 34, T6N, R87W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Gregg Kitchen, Gen Mgr
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 inch es
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: N/A _
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
"soils" 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. *Maj or 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: Yes N N/A
14. Existing embankment freeboard: (normal 2.7') ~•~ feet
15. Increase L/ Decrease in water level: O~ feet
16. Cracks, bulging, or erosion on upstream face: Yes Q° N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes: Yes ~ N/A
Decant system: N/A
Diversion ditches: Yes ~ N/A
19. *Cracking or crushing of pipes

Spillway pipes: Yes No N/A
Decant system: N/A
20. Trash racks clear and in place: NjA
*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.