2010-12-22_HYDROLOGY - C1980005 ‎(2)‎

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 12/22/2010
• Doc Name: 4th Quarter 2010 Sedimentation Pond Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: SB1
• Email Name: SLB
• Media Type: D
• Archive: No

A
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTORS NAME: Dennis Jones
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 Cc)
MINE I.D. NO.: CMLRD Permit No. C-80-005
DATE: 'V'9 - 10-
DATE LAST INSPECTION: I- /-1 0
LOCATION: SWV44 NWY44, Sec. 7, TSN, R86W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNERS REP.: Roy Karo, Gen Mgr
Circle or write in appropriate response
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6:1
No
No
No
No
No
No
No
No
No
No
No
No
feet
feet
k1n
N/A
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Yes {J
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Yes ®N N/A
N/A
es No 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.
Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: 12
Compaction according to approved plan: Yes
Burning (specify extent and location): No
Angle of slope: 3:1 upstream, 3:1 downstream Total =
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
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: 54°e o'4L9-15j Yes
*Erosion of toe: Yes
*Water impounded against toe: Yes
Existing embankment freeboard: (normal = 4.71) C

Increase
Decrease
in water level: "-a c?4?„ _
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)