2009-04-21_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/21/2009
• Doc Name: 1st Quarter 2009 Sedimentation Pond Inspection Report
• 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:
NPDES I.D. NO.: CO-0000221 D.P. 015
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #015 LOCATION: NEY4 SEY4, Sec. 23, TSN, R88W
MINE NAME: Seneca II-W Mine (Seneca Coal Co) LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Roy Karo, Gen Mar
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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: 2.5:1 upstream, 3.5:1 downstream Total = 6:1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: NLA
At isolated points on embankment slopes: Yes No
At natural hillside: Yes No
Over widespread areas: Yes No
From downstream foundation area: Yes No
"Boils" beneath stream or ponded water: Yes No
Cracks or scarps on crest: Yes No
Cracks or scarps on slope: Yes No
Sloughing or bulging on slope: Yes No
*Major erosion problems: Yes No
Surface movements in valley bottom or on hillside: See 046.1.51- Ye No
*Erosion of toe: Yes No
*Water impounded against toe: Yes No
Existing embankment freeboard: (normal = 4.0') ?.? feet
Increase Decrease in water level: Ko CL.ctti feet
Cracks, bulging, or erosion on upstream face: ? Yes Q
Visible sumps or sinkholes in slurry surface: N/A
*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 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 space on the
back of this sheet.
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