2008-10-24_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/24/2008
• Doc Name: 3rd Quarter 2008 Sedimentation Pond Inspection Report
• 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: Q y'd -0
NPDES I.D. NO.: CO-0000221 D.P. 011 / Z _O Q
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: o ^f V
SITE NAME: Pond #011 LOCATION: NEV4 SW1/a,Sec. 16, 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 Mar
Circle or write in appropriate response
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Foundation preparation (removal of vegetation, stumps, topsoil:
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3.0:1 upstream, 2.8:1 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 fjreeboard: (normal = 5.11)
Increase ? Decrease in water level:
Yes
8
Yes
No
Total
in.
5.8:1
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes N
feet
feet
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Cracks, bulging, or erosion on upstream face: Yes N/A
Visible sumps or sinkholes in slurry surface: N/A
*Clogging
Spillway channels and pipes: Yes No N/A
Decant system: N/A
Diversion ditches: N/A
*Cracking or crushing of pipes
Spillway pipes: Yes Q N/A
Decant system: N/A
20. Trash racks clear and in place: Yes No N/A
21. Discharge rate (gpm) l.., wJ,9-, I sc1.o'.%a 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.