HYDRO28814

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 7/26/2004
• Doc Name: 2nd Quarter 2004 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DMG
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Imyoundments ~/
INSPECTOR'S NAME: Dennis Jones DATE: 6~ a 3 'o
NPDES I.D. NO.: CO-0000221 D.P. 013 •-~ /~ O c,
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: J 7
SITE NAME: Pond #013 LOCATION: SEA NW~,Sec. 19. TSN, 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.: Greaa Kitchen, Gen Mar
Circle or write in anorooriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: i n.
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: NL
At isolated points on embankment slopes: Yes o 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 No N/A
10. *Major erosion problems: Yes No N/A
11. Surface movements in valley bottom or on hillside: Yes No N/A
12. *Erosion of toe: Yes o N/A
13. *Water impounded against toe: Yes o N/A
14. Existing embankment freeboard: (normal = 4' proposed) S~.S -~ feet
15. ~C
Increase Decrease in water level : ~ • 5 •6-_r feet
_
16. Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. Visible sumps or sinkholes in slurry surface: NL
18. *Clogging
Spillway channels and pipes: Yes ®N N/A
Decant system: NL
Diversion ditches: Yes ® N/A
19. *Cracking or crushing of pipes

Spillway pipes: Yes ~ N/A
Decant system: N A
20. Trash racks clear and in place: Yes ~ N/A G~9
*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.