2011-05-18_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 5/18/2011
• Doc Name: 1st Quarter 2011 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO-0000221 D.P. 011
FACILITY CONFIGURATION:
SITE NAME: Pond #011
MINE NAME: Yoast Mine(Seneca Coal Cc)
MINE I.D. NO.: CMLRD Permit No. C-94-082
DATE : 3 ' o I
DATE LAST INSPECTION: O"ZO' 10
LOCATION: NEY4 SWY4,Sec. 16, TSN, R87W
LOCATION: 8.5 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: 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)
From underdrain pipes: Yes N/A
At isolated points on embankment slopes: 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 i 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
il. 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 = 5.11) feet
15. Increase Decrease in water level: yto c Lze feet
16. Cracks, bulging, or erosion on upstream face: Yes (
-23 N/A
17. Visible sumps or sinkholes in slurry surface: ,
N/A
18. *Clogging
Spillway channels and pipes: Yes N/A
Decant system: N/A
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes N/A
Decant system: N/A
20. Trash racks clear and in place: ® No N/A
21. Discharge rate (gpm) U
*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.
-? ULO Lo
Cross-Valley Pond