2013-07-11_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/11/2013
• Doc Name: 2nd Quarter 2013 Quarterly Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Chris Miller
NPDES I.D. NO.: CO- 0000221 D.P.008
FACILITY CONFIGURATION: Cross Valley Pond
SITE NAME: Pond #008
MINE NAME: Seneca II Mine (Seneca Coal Company)
MINE I.D. NO.: CDRMS Permit No. C -80 -005
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DATE: 6/10/13
DATE LAST INSPECTION: 3/5/13
LOCATION: SW4NWI-4, Sec. 7, T5N, R86W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen. Mgr
Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps, topsoil: Yes
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:
"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: See below
*Erosion of toe:
*Water impounded against toe:
Existing embankment freeboard: (normal= 4.71)
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:
*Cracking or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
Discharge rate (gpm)
12 in.
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No
Total = 6:1
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4_7
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4.0
*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.