HYDRO29885

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 12/6/1999
• 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, Sedimeat, or Slurry Impoundments
INSPECTOR'S NAME: Michael Altavilla DATE: - 09/23/99
NPDES I.D. NO.: CO-0000227 D.P. 006
FACILITY CONFIGURATION: Croce-Vallelr Pond DATE LAST INSPECTION: 06/x/44
SITE NAME: Pond :1006/Pre-Sett7;nq_easin LOCATION: NWT NW} ~ TcN R88W
MINE NAME: ceneca II-W Mine (c n a .oar 01 LOCATION: 8 mi_ S of Hayden CO
MINE I.D. NO.: CMT.Rn P mi No. -8 -OS7 OWNER'S REP.: Brad Brown, Gen Mqr
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20
Foundation preparation (removal of vegetation, stumps, topsoil:
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of elope: 3:1 upstream, 3:1 downstream
*Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes:
At natural hillside:
Over widespread areas:
From downstream foundation area:
"Boils" beneath stream or ponded water:
Cracks or scarps on treat:
Cracks or scarps on elope:
Sloughing or bulging on elope:
*Major erosion problems:
Surface movements in valley bottom or on hillside:
*Eroeion of toe:
*Water impounded against toe:
Existing embankment freeboard: Approximately
~C- Increase Decrease in water level:
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
Ye No
1Z in
es No
Yes No
Total = 6:1
Yes No
Yee
Yee
Yes o
Yee
Yee
Yee No
Yee
Yes o
Yee
Yee o
Yee o
Yes
9.0 feet
D.s feet
Yee No
Yee No
N/A
N/A
N A
N/A
N/A
N/
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
/
Yes ~ N A
Yes No
Yee O N/A
Yes
Yee No
Yee No N/
*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.