HYDRO22498

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 12/4/2006
• Doc Name: 4th Quarter 2006 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• 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: _IO' I ~'Q l7
NPDES Z.D. NO.: CO-0000221 D.P. 004 ~

FACILITY C
ONFIGURATION: Cross-Valley Pond G
DATE LAST INSPECTION: !-IZ '~
SITE NAME: South Section 12 Pond #004 LOCATION: SW'/. SEA/., Sec~12, TSN. R87W
MINE NAME: Seneca II Mine (Seneca Coal Co) LOCATION: 7,1 mi. SE of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C -80-005 OWNER'S REP,: Gregg 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: 5:1 upstream, 2:1 downstream Total = 7:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: NLA
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: Ye
s No N/A
14. Existing embankment freeboard: (normal = 4.8') /
e
°t.u eet
15. Increase Decrease in water level: h~+ cl.a~4 o
~ feet

16. T
_
Cracks, bulging, or erosion on upstream face:
Yes
~
N/A
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging
Spillway channels and pipes: Yes ISO N/A
Decant system: Zwcon¢va P Yes No N/A
Diversion ditches: Yes ~ N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: Y
e
s No N/A
20. Trash racks clear and in place: /
y
-~
(s es/ 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.