HYDRO22916

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 10/23/1998
• 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, 8adimeaL, or Slurry Impouadmeats
INSPECTOR'S NAME: Micha 1 Al av' la DATE: 09/21/98
NPDES I.D. NO.: co-0000221 D.P. 009
FACILITY CONFIGURATION: Croe sValley Pond DATE LAST INSPECTION: 06/j9/9~
SITE NAME: Pond L'009 LOCATION: SEit SW3t, Sec_ il, TSN, RBBW
MINE NAME: Seneca Ir-W Mine (ceneca Coal 01 LOCATION: 8 mi. 5 of Hayden CO
MINE I.D. NO.: CMi.Rn Permit No. C-82-OS7 OWNER'S REP.: Brad Brown, Gen Mgr
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9.
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Foundation preparation (removal of vegetation, stumps, topsoil: ee No
Lift thickness: 1Z in.
Compaction according to approved plan: ee No
Burning (specify extent and location): Yes No
Angle of elope: 3el upstream, 3:1 downstream Total = 6.1
*seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment elopes:
At natural hillside:
Over widespread areas:
From downstream foundation area:
"Boils" beneath stream or ponded water:
Cracks or scarps on crest:
Cracks or scarps on elope:
Sloughing or bulging on elope:
*Major erosion problems:
Surface movements in valley bottom or on hillside:
12. *Eroeion of toe:
13. *Water impounded against toe:
14. Existing embankment freeboard: A~lproximately
15. Increase ~ Decrease in water level:
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20.
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Yee /N~o
Yes cWv
Yee
Yee
Yes
Yee o
Yes
Yea
Yes
Yes C /f9i'
Yee
Yee
Yes
7.15 feet
D_25 feet
Yee No
Yee No
N/A
N/A
N/A
N/A
N A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
,N~/A~
Spillway channels and pipes: Yee ~ N A
Decant system: Yee No
Diversion ditches: Yee No N
*Cracking or crushing of pipes
Spillway pipes: Yee No N A
Decant system: Yee No
Trash racks clear and in place: ee 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 apace on
the back of this sheet.