2013-02-01_HYDROLOGY - C1982057 ‎(3)‎

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/1/2013
• Doc Name: 4th Quarter 2012 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: JLE
• Email Name: SB1
• Media Type: D
• Archive: No

Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: 11-13 1 2.
NPDES I.D. NO.: CO- 0000221 D.P. 017
FACILITY CONFIGURATION: Cross - Valley Pond
SITE NAME: Pond #017
MINE NAME: Seneca II -W Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C -82 -057
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PERIODIC INSPECTION FORM
DATE LAST INSPECTION:
Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps, topsoil:
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3:1 upstream, 3:1 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:Ge below
"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 = 3.1')
Increase Decrease in water level:
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes:
Decant system:
20. Trash racks clear and in place: n
2 1 . Discharge rate (gpm) k J 4 c .\ IQo 1 Q, ( fQc d 10%tiow ck;.S c .v
q -15-12
LOCATION: SW',, NE' %, Sec. 34, T5N, R88W
LOCATION: 8 mi. S of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
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Total = 6:1
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*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.
6- Muddy area at south side of dam toe. Has existed for years and appears not to be a problem.
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144.1s4 4 S Lk) V-6 Cla 0 K. W-4- 0.■ 1 2 . -2, •
in.
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3. 2_ feet
O.65 feet
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