HYDRO24087

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 10/5/2007
• Doc Name: 3rd Quarter 2007 Sedimentation Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundme
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INSPECTOR 'S NAME: Dennis Sones DATE: v
NPDES I.D . NO.: CO-0000221 D.P. 010 ! _ I ~ D~
FACILITY CONFIGURATION: Cross-Vallev Pond DATE LAST INSPECT ION: O
SITE NAME : Pond #010 LOCATION: NW'/. NEB/„ Sec 8 TSN R87W
MINE NAME : Yoast Mine (Seneca Coal Co) LOCATION: 8.5 mi. SE of Hav den. CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Greg o Kitchen , Gen Mgr
Circle Or Wr.l to in apprppilatE reSpORSe
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yed
2. Lift thickness: ~ 8 i n.
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: Yes N/A
At isolated points on embankment slopes: Yes o 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: Yes No N/A
8. Cracks or scarps on slope: Yes No N/A
9. Sloughing or bulging on slope: Yes No N/A
10. *Maj or erosion problems: Yes No N/A
11. Surface movements in valley bottom or on hillside: Yes No N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: (normal = 10.0') ~y•~ feet
15. Increase ~ Decrease in water level: ~•~ feet
16. Cracks, bulging, or erosion on upstream face: Yes Lwro N/A
17. Visible sumps or sinkholes in slurry surface: - NLA
18. *Clogging
Spillway channels and pipes: Yes ~ N/A
Decant system:
Diversion ditches: N A
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system:

20. [f~~
Trash racks clear and in
place: dN OML
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Yes No
N/A
21. r
l~ n 1
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Discharge rate (gpm) (V Q,TQV- QV E1.Q~ 7~_ q¢Wap Or4a c..hc~„gg
*Maj or 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.