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: Z-3-001
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #012A LOCATION: NE1/ NE1/a,Sec. 19, T5N, R87W
MINE NAME: Yoast Mine(Seneca Coal Co) LOCATION: 8.5 mi. SE of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Roy Karo, Gen Mar
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Foundation preparation (removal of vegetation, stumps, topsoil: _ Yes
Lift thickness: in.
Compaction according to approved plan: Yes
Burning (specify extent and location): No
Angle of slope: upstream, downstream Total =
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes
At isolated points on embankment slopes: Yes
At natural hillside: Yes
over widespread areas: Yes
From downstream foundation area: Yes
"Boils" beneath stream or ponded water: Yes
Cracks or scarps on crest: Yes
Cracks or scarps on slope: Yes
Sloughing or bulging on slope: Yes
*Major erosion problems: Yes
Surface movements in valley bottom or on hillside: Yes
*Erosion of toe: Yes
*Water impounded against toe: Yes
Existing embankment freeboard: (4.6' when full)
Increase Decrease in water level:
Cracks, bulging, or erosion on upstream face: Yes
Visible sumps or sinkholes in slurry surface: N/A
*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)
*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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