HYDRO26707

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 12/13/2004
• Doc Name: 4th Quarter 2004 Quarterly Sedimentation Pond Inspection Reports
• From: Seneca Coal Company
• To: DMG
• 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. 010
FACILITY CONFIGURATION: Cross-Vallev Pond DATE LAST INSPECTION: ~ ~-~
SITE NAME: Pond #010 LOCATION: NW'/. NEB/,. Sec. 8, TSN. R87W
MINE NAME: Yoast Mine (Seneca Coal Co) LOCATION: 8.5 mi. SE of Havden, CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Greoa Kitchen, Gen Mar
Circle or write in appropriate response
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Foundation preparation (removal of vegetation, stumps, topsoil
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3.75:1 upstream, 3.75:1 downstream
*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 = 10.0')
Increase Decrease in water level: LW c~+o<gA
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
Yes
_ 8
Yes
No
Total =
in.
7.5:1
Yes o N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes No N/A
feet
feet
Yes ® N/A
Yes ~ N/A
N A
Spillway pipes: Yes No N/A
Decant system: N A
20. Trash racks clear and in place; ~. eY;~. a": ~c es 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.