HYDRO22881

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 10/5/2007
• Doc Name: 3rd Quarter 2007 Sedimentation Inspection Report
• 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 Im~jpoundments
INSPECTOR'S NAME: Dennis Sones DATE: (-~~-~
NPDES I.D . NO.: CO-0000221 D.P. O15 ~

FACILITY
CONFIGURATION: Cross-Vallev Pond
DATE LAST ~-
INSPECTION: - G~
SITE NAME : Pond #015 LOCATION: NE'/, SE'/., Sec. 23, TSN. R88W
MINE NAME : Seneca ZI-W Mine (Seneca Coal Cod LOCATION: 8 mi. S of Havden CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Greq q Kitchen, Gen Mar
Circle or write in aooropriate response
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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: N A
At isolated points on embankment slopes: Yes No 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: 5~o~l~.st S: Yes No N/A
*Erosion of toe: Yes No N/A
*Water impounded against toe: Yes No N/A
Existing embankment freeboard: (normal = 4.0') L~ feet
Increase ~ Decrease in water level: ~~_ feet
Cracks, bulging, or erosion on upstream face; Yes No N/A
Visible sumps or sinkholes in slurry surface; N A
*Clogging
Spillway channels and pipes: Yes No N/A
Decant system: ~?
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system:
Trash racks clear and in place: Yes No N/A
f(^^
Discharge rate (gpm) (y4dQv^ ~e Ve Q-6 Ts} t4¢ ~o~ CS ~g j2
c klu'e V"1 Sip < 2,oZ- ~ ~..~t ~l.
*Major adverse changes in these items coul cause instability and
Engineering Manager and Mine Superintendent for further evaluation.
these items should normally be described (extent, location, volume
back of this sheet.
should be reported to the
Adverse conditions noted in
etc.) in the space on the