2009-04-21_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/21/2009
• Doc Name: 1st Quarter 2009 Sedimentation Pond Inspections
• 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: 3 -A - 00l
NPDES I.D. NO.: CO-0000221 D.P.
FACILITY CONFIGURATION: Cross-Val
SITE NAME: Pond #010
MINE NAME: Yoast Mine(Seneca Coal
MINE I.D. NO.: CMLRD Permit No. C
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010 G
Lev Pond DATE LAST INSPECTION:
LOCATION: NWIA NE'/a, Sec. 8, T5N, R87W
Co) LOCATION: 8.5 mi. SE of Hayden, CO
-94-082 OWNER'S REP.: Roy Karo, Gen Mar
Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps, topsoil: _ Yes
Lift thickness: 8
Compaction according to approved plan: Yes
Burning (specify extent and location): No
Angle of slope: 3.75:1 upstream, 3.75:1 downstream Total =
*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: Irv C ca.(.add
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 in place:
Discharge rate (gpm)
in.
7.5:1
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 N/A
Yes U N/A
Yes N N/A
0 feet
feet
Yes O N/A
N/A
Yes No N/A
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Yes N>
N/A
es No
?3
N/A
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.
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