HYDRO20117

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 7/11/2005
• Doc Name: 2nd Quarter 2005 Inspection Report
• 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 Impoundments
INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO-0000221 D,P. 008
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: Pond #008
MINE NAME: Seneca II Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No, C-80-005
DATE: G' ~SI'OS
DATE LAST INSPECTION: 3 ' /'~J
LOCATION: SW~ NW'b, Sec. 7, TSN, R86W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Gregg Kitchen Gen Mgr
Circle or write is appropriate reapoase
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12
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: 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
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps on crest: Yes No N/A
S. Cracks or Scarps Ori 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 (~70~ N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: (normal = 8.0') `~$ _ £eet
15. Increase ~
Decrease in water level: b•S feet
16. ._
Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system: N/A
DiVerSlOn ditChe6: N/A
19. *Cracking or crushing of pipes
Spillway pipes: e® No N/A
Decant system: N/A
20. Trash racks clear and in place: ~ No N/A
*Maj or 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.