2010-01-11_HYDROLOGY - C1980005 ‎(4)‎

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/11/2010
• Doc Name: 4th Quarter 2009 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO-0000221 D.P. 003
FACILITY CONFIGURATION: Diked Pond
SITE NAME: Northwest Impoundment #003
MINE NAME: Seneca II Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-80-005
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DATE : I D° 6 q- O 9
DATE LAST INSPECTION: O ( 1 ' 0 C(
LOCATION: SEY4 SWl/, Sec. 27, T6N, R87W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: 12
Compaction according to approved plan: Yes
Burning (specify extent and location): No
Angle of slope: 2:1 upstream, 3:1 downstream Total =
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes
At natural hillside: Yes
Over widespread areas: Yes
From downstream foundation area: Yes
"Boils" beneath stream or ponded water: Yes
Cracks or scarps on crest: Yes
Cracks or scarps on slope: Yes
Sloughing or bulging on slope: Yes
*Major erosion problems: Yes
Surface movements in valley bottom or on hillside: Yes
*Erosion of toe: Yes
*Water impounded against toe: Yes
Existing embankment freeboard: (normal = 4.91) -4.cf.
Increase Decrease in water level: G kn- -6, SL
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:
Discharge rate (gpm)
Yes
N/A
in.
5:1
o N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
N N/A
feet
feet
No N/A
Yes No N/A
N/A
Yes (NNp) N/A
Yes N/A
N/A
Yes No N/A
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*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.