2008-05-30_HYDROLOGY - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 5/30/2008
• Doc Name: 1st Quarter 2008 Sedimentation Pond Inspection Report
• 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 DATE: 3 _1 u_ Old
NPDES I.D. NO.: CO-0000221 D.P. 011 10-(j-67
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #011 LOCATION: NEV/ SWY4,Sec. 16, T5N, R87W
MINE NAME: Yoast Mine(Seneca Coal Co) LOCATION: 8.5 mi. SE of Hayden CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Gregg Kitchen, Gen Mgr
Circle or write in appropriate resvonse
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 8 in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3.0:1 upstream, 2.8:1 downstream Total = 5.8:1
6. *Seepage (specify location, color, and approximate volume)
At isolated points on embankment slopes: Yes o N/A
From underdrain pipes: Yes [Nc N/A
At natural hillside: Yes o N/A
Over widespread areas: Yes o N/A
From downstream foundation area: Yes o N/A
"Boils" beneath stream or ponded water: Yes o N/A
7. Cracks or scarps on crest: Yes o N/A
8. Cracks or scarps on slope: Yes o 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 N/A
13. *Water impounded against toe: Yes N/A
14. Existing embankment freeboard: (normal = 5.1') 3 feet
15. Increase Decrease in water level: k.u G??+?•cda 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: Yes No N/A
Decant system: N/A
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes Q N/A
Decant system: N/A
20. Trash racks clear and in place: es No N/A
21. Discharge rate (gpm) 0 ,4 Q-A ?QV Q cl?C g C1 +A 60 ow
*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.
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