HYDRO23109

• Permit No: C1982057
• 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: ~- II~ ~ 6
NPDE S' I.D. NO.: CO-0000221 D.P. 005 /
~ p_~/
FACILITY CONFIGURATION: Cross-Valley Pond .
DATE LAST INSPECTION: o OO OO
SITE NAME: Pond #005 LOCATION: NWT/, SW~/,, Sec. 10, 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.: Grepa Kitchen. Gen Mgr
Ci rCle Or Wrlte lri aDDIODrlate reSDOn9e
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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: 3.5:1 upstream, 2.5:1 downstream Total = 6:1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: © No N/A
At isolated points on embankment slopes: Yes o N/A
At natural hillside: Yes No NfA
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: h~ ~ No N/A
Sloughing or bulging on slope: Yes ~No N/A
*Maj or 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 No N/A
Existing embankment €reeboard: (normal = 7.4') /~•~1 feet
Increase ~/ Decrease in water level: ~• feet
Cracks, bulging, or erosion on upstream face: es No N/A
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: _
Yes No N/A
Yes No N/A
Yes No N/A
Yes o N/A
es No N/A
*Maj or 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.