HYDRO31671

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 4/10/1997
• Doc Name: 1st Qtr 1997 Sediment Pond Inspection
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

~.,
RECEIVED
PfiRIODIC INSPECTION FORM APR 1 0 1997
Water, Sediment, or Slurry Impoundments
i)ias(on o) minerdis a laeoiogy
INSPECTOR' S NAME: Michael Altavilla DATE: 03/18 /97
NPDES I.D. NO.: CO-0000221 D.P. 010
FACILITY CONFIGURATION: Cross-Val ley Pond DATE LAST INSPECTION: 12/20/96
SITE NAME: Pond_~010 LOCATION: NWS: NE'/.. Sec. 8. T5N. 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.: Brad Brown. Gen Mar
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes No N/A
2. Lift thickness: 8 in. N/A
3. Compaction according to approved plan: ~ No N A
4. Burning (specify extent and location): Yes No N/A
5. Angle of slope: 3.75:1 upstream, 3.75:1 downstream Total = 7.5:1 N/A
6. *Seepage (specify location, color, and approximate volume) .
From underdrain pipes: Yes o N/A
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 N/A
"Boils" beneath stream or ponded water: Yes N/A
7. Cracks or scarps on crest: Yes o N/A
8. Cracks or scarps on slope: Yes ~ N/A
9. Sloughing or bulging on slope: Yes Qo N/A
10. *Maj or erosion problems: Yes N/A
11. Surface movements in valley bottom or on hillside: Yes N/A
12. *Erosion of toe: Yes o N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: A ooroximatelv 10.0 feet
15. ~ Increase Decrease in water level: 2.0 feet
16. Cracks, bulging, or erosion on upstream face: Yes ®o N/A
17. Visible sumps or sinkholes in slurry surface: Yes No /A
18. *Clogging
Spillway channels and pipes: Yes ~ N A
Decant system: Yes No
Diversion ditches: Yes ~ N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes
Decant system: ~ Yes No .J
20. Trash racks clear and in place: Yes No N/
*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.