2011-07-28_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/28/2011
• Doc Name: 2nd Quarter 2011 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
C�
INSPECTOR'S NAME: Dennis Jones DATE: 6
NPDES I.D. NO.: CO- 0000221 D.P. 010
FACILITY CONFIGURATION: Cross - Valley Pond DATE LAST INSPECTION: 3 .2 : 3- 11
SITE NAME: Pond #010 LOCATION: NW NE',,, Sec. 8, 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.: Roy Karo, Gen Mgr
Circle or write in appropriate response
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: 3.75:1 upstream, 3.75:1 downstream Total = 7.5:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: at X . l w1 No N/A
At isolated points on embankment st'o P es: Yes o
1 N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes No N/A
"Boils" beneath stream or ponded water: Yes No N/A
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:
12. *Erosion of toe:
13. *Water impounded against toe:
14. Existing embankment freeboard: (normal = 10.0')
15. J Increase Decrease in water level: Se.n b .Loi.)
16. Cracks, bulging, or erosion on upstream face:
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes:
Decant system:
20. Trash racks clear and in place:
21. Discharge rate (gpm)
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes N N/A
feet
feet
Yes N6 N/A
N/A
Yes ( N/A
N/A
N/A
Yes C N/A
N/A
® No N/A
Il S
*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.