HYDRO22160

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 1/26/1998
• Doc Name: 4th Qtr 1997 Sediment Pond Inspections
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

RECEIVED
PERIODIC INSPECTION FORM JAN 2 6 1998
Water, Sediment, or Slurry Impoundments
"~sion of Minerals & Geology
INSPECTOR'S NAME: Michael Altavilla DATE: 12/17/97
NPDES I.D. NO.: CO-0000221 D.P. 010
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 09/26/97
SITE NAME: Pond SO10 LOCATION: N~"1'~~;i., Sec. 8, Tr+N, R87W
MINE NAME: Yoas twin (Seneca Coal Co) LOCATION: 8.5 m+. c o Hayes, CO
MINE I.D. NO.: c 7.Rn P m, No. - 4-0R OWNER'S REP.: Brad Brown Gen Mqr
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes No N/A
2. Lift thickness: ~_ in. N/A
3. Compaction according to approved plan: ea No N/A
4. Burning (specify extent and location): Yes No
5. Angle of elope: 3.75:7 upstream, 3.75:1 downstream Total = 7 .5:1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipee: Yee o N/A
At isolated points on embankment elopes: Yea N/A
At natural hillside: Yee N N/A
Over widespread areas: Yee o N/A
From downstream foundation area: Yea No N/A
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps on treat: Yee No N/A
8. Cracks or scarps on slope: Yee ( l~o N/A
9. Sloughing or bulging on elope: Yes No N/A
10. *Major erosion problems: Yes ©o N/A
11. Surface movements in valley bottom or on hillside: Yee No N/A
12. *Eroaion of toe: Yes ~ N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: Agproximatel_y l0_o feet
15. Increase Decrease in water level: No change feet
16. Cracks, bulging, or erosion on upstream face: Yes 0 N A
17. Visible sumps or sinkholes in slurry surface: Yes No N/A
18. *Clogging
Spillway channels and pipes: Yes No N A
Decant system: Yea No A
Diversion ditches: Yes No N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yee `~J N A
Decant system: Yes No A
20. Trash racks clear and in place: Yee No
*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.