2012-11-08_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/8/2012
• Doc Name: 3rd Quarter 2012 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: JLE
• Email Name: SB1
• Media Type: D
• Archive: No

INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO- 0000221 D.P. 017
FACILITY CONFIGURATION: Cross - Valley Pond
SITE NAME: Pond #017
MINE NAME: Seneca II -W Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C -82 -057
1.
2.
3.
4.
5.
6.
Foundation preparation (removal of vegetation, stumps, topsoil:
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3:1 upstream, 3:1 downstream
18. *Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
DATE: l - (. C .► " 1
DATE LAST INSPECTION: ` I
LOCATION: SW',, NE',,, Sec. 34, T5N, R88W
LOCATION: 8 mi. S of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
Circle or write in appropriate response
Yes
in.
Yes
No
Total = 6:1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes o N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area see belov�j es 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 No N/A
14. Existing embankment freeboard: (normal = 3.1') 3.5G feet
15. Increase V Decrease in water level: 0:1S feet
16. Cracks, bulging, or erosion on upstream face: Yes N/A
17. Visible sumps or sinkholes in slurry surface: N/A
Yes N/A
N/A (�
N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes N/A
Decant system: N/A
20. Trash racks clear and in place: Yes N/A
21. Discharge rate (gpm) (,V c.� ��^ 1,2 v *1_ . v . caw :5 4v 0
*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.
6- Muddy area at south side of dam toe. Has existed for years and appears not to be a problem.