2012-11-05_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/5/2012
• Doc Name: 3rd Quarter 2012 Quarterly Sedimentation Pond
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

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
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Imppoundments
DATE: l - 2) - 1 -2 —
DATE LAST INSPECTION:
LOCATION: SW NW' %, Sec. 7, T5N, 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:
2. Lift thickness:
3. Compaction according to approved plan:
4. Burning (specify extent and location):
5. Angle of slope: 3:1 upstream, 3:1 downstream
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes:
At natural hillside:
Over widespread areas:
From downstream foundation area:
"Boils" beneath stream or ponded water:
7. Cracks or scarps on crest:
8. Cracks or scarps on slope:
9. Sloughing or bulging on slope:
10. *Major erosion problems:
11. Surface movements in valley bottom or on hillside: GOB_ 0}.4.1%1 S
12. *Erosion of toe:
13. *Water impounded against toe:
14. Existing embankment freeboard: (normal = 4.7')
15. Increase Decrease in water level: Iq.o c Lc4 k�
16.
17.
18.
Yes
12
Yes
No
Total = 6:1
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
9.7 feet
feet
N/A
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes: Yes ( No) N/A
Decant system: N/A
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes: Yes (No) N/A
Decant system: N A
20. Trash racks clear and in place: Yee No N/A
21. Discharge rate (gpm) 7
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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.