2010-07-28_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/28/2010
• Doc Name: 2nd Quarter 2010 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• 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 : 616- 1 D
DATE LAST INSPECTION: 3-2 -10
LOCATION: SWU NWl/,, Sec. 7, TSN, R86W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
Circle or write in appropriate response
1 Foundation preparation (removal of vegetation, stumps, topsoil: _ Y1s
.
2. Lift thickness: -
Yes
3 Compaction according to approved plan:
.
4. Burning (specify extent and location):
No
Total =

6:1
5. Angle of slope: 3:1 upstream, 3:1 downstream
6. *Seepage (specify location, color, and approximate volume) N/A
From underdrain pipes: -
Yes
No
N/A
At isolated points on embankment slopes:
At natural hillside: Yes No
N N/A
N/A
Over widespread areas: Yes
Yes o
No N/A
From downstream foundation area: Yes No N/A
"Boils" beneath stream or ponded water: N N/A
7. Cracks or scarps on crest: Yes
Yes o
No N/A
8. Cracks or scarps on slope: Yes No N/A
9. Sloughing or bulging on slope: Yes N/A
10. *Major erosion problems:
hillside: 5E? C S? es No N/A
11. Surface movements in valley bottom or on N/A
12. *Erosion of toe: Yes
Yes (NoJ N/A
13. *Water impounded against toe:
' ? feet
14. )
Existing embankment freeboard: (normal = 4.7
t
L
feet
15. %!JR
'ea
Increase Decrease in water level: I1o C Y o N/A
16. Cracks, bulging, or erosion on upstream face: es
N/A ©
17. visible sumps or sinkholes in slurry surface:
18. *Clogging
Yes
No
N/A
Spillway channels and pipes: N/A
Decant system: N/A
Diversion ditches:
19. *Cracking or crushing of pipes
Yes
N
N/A
Spillway pipes: N/A
Decant system:
? No N/A
20. Trash racks clear and in place: S3
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.