HYDRO25239

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 10/20/2006
• Doc Name: 3rd Quarter 2006 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• 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. 004
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: South Section 12 Pond #004
MINE NAME: Seneca II Mine (Seneca Coal Co)
MINE Z.D. NO.: CMLRD Permit No. C-80-005
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DATE LAST INSPECTION: V -I~ ~yO
LOCATION: SW'/. SE'/,, SeC. 12, TSN R87W
LOCATION: 7.1 mi. SE of Hayden CO
OWNER'S REP.: Grego Kitchen. Gen Mar
Circle or Write in aDDrooriate 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: 5:1 upstream, 2:1 downstream Total = 7:1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: N A
At isolated points on embankment slopes: Yes N 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: Yes No N/A
*Erosion of toe: Yes No N/A
*Water impounded against toe: Yes N N/A
Existing embankment freeboard: (normal = 4.8') ~~ feet
Increase Decrease in water level: h o c ~e.~~ feet
Cracks, bulging, or erosion on upstream face: Yes No N/A
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pip
Decant system:
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
s: Yes No N/A
Yes No N/A
Yes No N/A

Yes No N/A
Yes o N/A
Yes No e
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.