2010-04-26_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/26/2010
• Doc Name: 1st Quarter 2010 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• 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.: N/A
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: Pond #016A
MINE NAME: Seneca II-W Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-82-057
DATE: J -,a -10
DATE LAST INSPECTION: ( 6 - 1 - O 1
LOCATION: NE1/4 SEV44, Sec. 27, TSN, R88W
LOCATION: 8 mi. S 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: in.
3. Compaction according to approved plan:
4. Burning (specify extent and location): No
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes o
At natural hillside: Yes

Over widespread areas:
Yes [No)
From downstream foundation area: L,e (pc« ® No
"Boils" beneath stream or ponded water: Yes No
7. Cracks or scarps on crest: Yes No
8. Cracks or scarps on slope: Yes No
9. Sloughing or bulging on slope: Yes No
10. *Major erosion problems: Yes
11. Surface movements in valley bottom or on hillside: S? vcu Aou_ 4 Yes o
12. *Erosion of toe: Yes o
13. *Water impounded against toe: Yes o
14. Existing embankment freeboard: (normal = 5.41, 2008) feet
15. Increase Decrease in water level: Q feet
16. Cracks, bulging, or erosion on upstream face: Yes No
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging /?
Spillway channels and pipes: Yes bN
Decant system: N/A
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Sew 64- vcf? es No
Decant system: N/A
20. Trash racks clear and in place: es No
21. Discharge rate (gpm) K .p.
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
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.