2008-08-04_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/4/2008
• Doc Name: 2nd Quarter 2008 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE:
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Final Pit Impoundment DATE LAST INSPECTION:
SITE NAME: PeaCoCo Reservoir LOCATION: SW1/a NW1/a Sec. 2, T5N, R87W
MINE NAME: Seneca II Mine (Seneca Coal Cc) LOCATION: 7.1 mi SE 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:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope (degrees)
*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 = 6.1'
Increase Decrease in water level: Ino c yS2.
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 inffplace:
Discharge rate (gpm) W0Q -" ® a ( '? oo ? ?ti Ck?Ve? OH's `Z
inches
Yes
No
NLA
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
?Yes
T
Yes
1A
degrees
No
No
No
No
No
No
No
No
No
No
No
No
feet
feet
No
Yes
NA
N/A
Yes
1A
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.