2009-08-03_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/3/2009
• Doc Name: 2nd Quarter 2009 Sedimentation Pond Inspections Reports
• 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 DATE: CS - lo - o
NPDES I.D. NO.: CO-0000221 D.P. 008
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: Pond #008
MINE NAME: Seneca II Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-80-005
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DATE LAST INSPECTION: 3 , a - U
LOCATION: SWY4 NW1/4,_ Sec. 7, TSN, R86W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mar
Circle or write in anproipriate 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: 3:1 upstream, 3:1 downstream Total = 6:1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes o N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes No N/A
"Boils" beneath stream or ponded water: Yes No N/A
Cracks or scarps on crest: Yes No N/A
Cracks or scarps on slope: Yes No N/A
Sloughing or bulging on slope: Yes No N/A
*Major erosion problems: Yes No N/A
Surface movements in valley bottom or on hillside: SEA 10-1 Si
Aq-

Yes
<D

No

N/A
*Erosion of toe: Yes N/A
*Water impounded against toe: Yes N N/A
Existing embankment freeboard: (normal = 4.71) feet
Increase Decrease in water level: KO cL.?C"%!;3.9 feet
Cracks, bulging, or erosion on upstream face: Yes No N/A
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels
Decant system: _
Diversion ditches:
*Cracking or crushing of
Spillway pipes: _
Decant system: _
20. Trash racks clear and in place:
21. Discharge rate (gpm)
and pipes:
pipes
N/A
Yes No N/A
N/A
N/A
Yes N/A
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Yes No N/A
G?
*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.