HYDRO24107

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/2002
• Doc Name: 1st Quarter 2002
• 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 DATE: ~ -~ G -~~
NPDES I.D. NO.: CO-0000221 D.P. 015

FACILITY CONFIGURATION: Cross-Valley Pond
DATE LAST _~_~
INSPECTION:
SITE NAME: Pond #015 LOCATION: NE'/a SEQ. Sec. 23. TSN. R88W
MINE NAME: Seneca II-W Mine (Seneca Coal Col LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Grego Kitchen Gen Mgr
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. *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: Yes N N/A
14. Existing embankment freeboard: (normal = 4.0') ~~~ feet
15. (L Increase Decrease in water level: O•~ e
et
f
_ __ ,-
~
16. Cracks, bulging, or erosion on upstream face: Yes l~ NJA
17. Visible sumps or sinkholes in slurry surface: Yes No
18. *Clogging

Spillway channels and pipes:
Yes ~~
'l ~J
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
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.