HYDRO20922

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 7/15/2002
• Doc Name: 2nd Quarter 2002 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 Impound(m'ents
INSPECTOR'S NAME: Dennis Jones DATE: J - ~~
NPDES I.D. NO.: CO-0000221 D.P. 015
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: ~ - ~~~ ~
SITE NAME: Pond #015 LOCATION: NE'/< SE'/a, Sec. 23, TSN, 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-S2-057 OWNER'S REP.: Greaa Kitchen, Gen Mar
Circle or write in appropriate response
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: 2,5:1 upstream, 3.5:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
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. *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 No N/A
14. Existing embankment freeboard: (normal = 4.0') u
1•~ feet
15. Increase Decrease in water level: ~J C ~ ~ feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: Yes No
18. *Clogging

Spillway channels and pipes: Yes No N/A
Decant system: Yes No
Diversion ditches: Yes No
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: Yes No ~N/1P
20. Trash racks clear and in place: Yes 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.