2007-11-30_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspections
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Media Type: D
• Archive: No

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NPDES I.L). NO.: CO-0000221 D.P. 013 /~j
O`er
FACILITY CONFIGURATION: Cross-Valley Pond _
DATE LAST INSPECTION: L o /
SITE NAME: Pond #013 LOCATION: SE'/ NWL/,,Sec. 19, TSN, 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.: Gregg Kitchen, Gen Mgr
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundmen/t se ~]
INSPECTOR'S NAME: Dennis Jones DATE: ~ o -(V ~O I
Circle or write in appropriate response
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Foundation preparation (removal of vegetation,
Lift thickness
Compaction according to approved plan:
Bunning (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:
*Erosion of toe:
*Water impounded against toe:
Existing embankment freeboard: (normal = 4')
Increase Decrease in water level: 1~1c~ ~~a.~•.c~0
in.
No
Total = 6:1
N~
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
S
Cracks, bulging, or erosion on upstream face: Yes
Visible sumps or sinkholes in slurry surface: ~A
*Clogging
No
No
No
No
No
No
No
No
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
feet
.feet
IQo N/A
Spillway channels and pipes: Yes ~ N/A
Decant system: /
Diversion ditches: Yes lDid N/A
*Crz~cking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: N L
Trash racks clear and in place: ~ No N/A
Discharge rate (gpm) Wct~`e-y ~'~y,2.~ ~so ~ 'J ~s ~^°,}~
stumps, topsoil: Yes
*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.