HYDRO20084

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 4/11/1997
• Doc Name: QUARTERLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR' S NAME: Dennis Jones DATE: 03/19/97
NPDES I.D. NO.: CO-0000221 D.P. 009
FACILITY C ONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 12/03 /96
SITE NAME: Pond #009 LOCATION: SEY SW y. Sec. 11. TSN. RBBW
MINE NAME: Seneca II-W Mine (Seneca Coal Co ) LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Brad Brown, Gen Mar
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: es No N/A
4. Burning (specify extent and location): Yes No ~
"U
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No
At isolated points on embankment slopes: Yes N A
At natural hillside: Yes No 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 ~ 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
11. 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/A
14. Existing embankment freeboard: Approximately 9.6 feet
15. Increase Decrease in water level: No chance feet
16. Cracks, bulging, or erosion on upstream face: Yes ~ A
17. Visible sumps or sinkholes in slurry surface: Yes No N/A
18. *Clogginq
Spillway channels and pipes: Yes ® N A
Decant system: Yes No
Diversion ditches: Yes No
19. *Cracking or crushing of pipes
Spillway pipes: Yes ® N~
Decant system: Yes No //I~
20. Trash racks clear and in place: ~ No 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.