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

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Immppoundments
INSPECTOR'S NAME: Dennis Jones DATE:
NPDES I.D. NO.: CO- 0000221 D.P. 005
FACILITY CONFIGURATION: Cross - Valley Pond DATE LAST INSPECTION: 6 _11H
SITE NAME: Pond #005 LOCATION: NW SW %, Sec. 10, T5N, R88W
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.: Roy Karo, Gen Mgr
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3.5:1 upstream, 2.5:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: b e 0(0 cp 54„, � : k yi4 CI.4LA alra No N/A
At isolated points on embankment Alopes: Yes N/A
At natural hillside: Yes N/A
Over widespread areas: Yes N/A
From downstream foundation area: Yes N/A
"Boils" beneath stream or ponded water: Yes N/A
7. Cracks or scarps on crest: Yes N/A
8. Cracks or scarps on slope: Yes N/A
9. Sloughing or bulging on slope: Yes N/A
10. *Major erosion problems: Yes N/A
11. Surface movements in valley bottom or on hillside: Yes N/A
12. *Erosion of toe: Yes N/A
13. *Water impounded against toe: Yes N• N/A
14. Existing embankment / freeboard: (normal = 7.4') /0.1 feet
15. Increase ,/ Decrease in water level: _j_ feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes: Yes N/A
Decant system: Inoperable Yes No N/A
20. Trash racks clear and in place: No N/A
21. Discharge rate (gpm) W Q-Ar. )e J_
Inoperable
Q 0 4J ►5 CLZ O
0
No
No
No
No
No
No
No
No
No
No
Yes 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.
6: Muddy area below decant valve culvert has existed for years, appears not to be a problem.