2007-11-30_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: - 0
NPDES I.D. NO. N A ~=~
FACILITY CONFIGURATION: Final Pit Impoundment DLOCAT ONT SW%PNW%IOSec 2 T5N, 87W
SITE NAME: Pe~~CoCo Reservoir
MINE NAME: Seneca II Mine (Seneca Coal Co) LOCATION: 7 1 mi SE of Havden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Greaa Kitchen Gen Mar
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Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps, topsoil:
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope (degrees)
*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 crest:
Cracks or scarps on slope:
Sloughing or bulging on slope:
*Major erosion problems:
Surface' movements in valley bottom or on hillside:
*Erosiori of toe:
*Water impounded against toe:
Existing embankment freeboard: (normal - 6 1')
=ncrease Decrease in water level: Irv G~-~yQ
Cracks, bulging, or erosion on upstream face:
VisiblE~ sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Cracki:ng or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in1place: n
Discharge rate (gpm) (,~yrc.~'2v` ~ (C~ ~'~ tQ~e~¢,n -~'` ~`^' veYd o~•-d ~~
Yes
inches
Yes
No
degrees.
NLA
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
feet
feet
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Yes ( col
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NSA ~
Yes No
~A
NlA
Yes No
~A
N1A
*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.