2007-11-30_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspections
• 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: f D- ~U ~~~
NPDES I.D. NO.: CO-0000221 D.P. 006 q l{_~
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 1t
SITE NAME: Pond #006 LOCATION: NW1/a NW'/ Sec . 22 , 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.: Gregg Kitchen, Gen Mar
Circle or write in appropriate response
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Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: 12 in.
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:
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:
*Erosion of toe:
*water impounded against toe:
Existing embankment freeboard: (normal = 7.5')
Increase Decrease in water level c two cinaeae-u~
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 No N/A
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~• S feet
feet
Yes ® N/A

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N A
Yes No N/A
Yes No N/A
es No N/A
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.