2007-11-30_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundmen~t]s
INSPECTOR'S NAME: Dennis Jones DATE: ~0 ~~~ l
NPDES I.D. NO.: CO-0000221 D.P. 017
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: ~ ~ ~ ~
SITE NAME• Pond #017 LOCATION: SW1/a NE1/ Sec. 34 T5N, R 8W
MINE NAME: Seneca II-W Mine (Seneca Coal Co) LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 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: in.
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
Yes
No
N/A
At isolated points on embankment slopes: Y i
No N/A
At natural hillside: es
Yes ~ N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water:
7. Cracks or scarps on crest: Yes
Y No
N N/A
N/A
8. Cracks or scarps on slope: es
Y o
N N/A
9 Sloughing or bulging on slope: es o
.
10. *Major erosion problems: Yes
Y No
No N/A
N/A
11 Surface movements in valley bottom or on hillside: es
. Yes No N/A
12. *Erosion of toe: Yes o N/A
13. *Water impounded against toe:
' 3
~ t
f
14. )
Exist/}'ng embankment freeboard: (normal = 3.1 •
~ D ee
feet
15. V Increase Decrease in water level: Y No N/A
16 Cracks, bulging, or erosion on upstream face: es
.
17. Visible sumps or sinkholes in slurry surface: N A
18. *Clogging
Yes
No
N/A
Spillway channels and pipes: ~A
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Y
~
N/A
Spillway pipes: es
N L
Decant system: es No N/A
20. Trash racks clear and in place:
21. Discharge rate (gpm) -~- -
*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.