2009-01-22_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/22/2009
• Doc Name: 4th Quarter 2008 Sedimentation Pond Inspections
• 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 U
INSPECTOR'S NAME: Dennis Jones DATE:
NPDES I.D. NO.: CO-0000221 D.P.
FACILITY CONFIGURATION: Cross-Val
SITE NAME: Pond #010
MINE NAME: Yoast Mine(Seneca Coal
MINE I.D. NO.: CMLRD Permit No. C
010
Lev Pond DATE LAST INSPECTION: oo V
LOCATION: NWl/a NEl/a, Sec. 8, T5N, R87W
Co) LOCATION: 8.5 mi. SE of Hayden, CO
-94-082 OWNER'S REP.: Roy Karo, Gen Mar
Circle or write in approxrmate response
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Foundation preparation (removal of vegetation, stumps, topsoil: _ Yes
Lift thickness: 8
Compaction according to approved plan: Yes
Burning (specify extent and location): No
Angle of slope: 3.75:1 upstream, 3.75:1 downstream Total =
*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//w?ater:
Cracks or scarps on crest: -sw,. ?l tXyu Sao 61 c t,"L(S -Ou
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 = 10.0')
Increase Decrease in water level: Wo c a+?c?o
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels
Decant system: _
Diversion ditches:
*Cracking or crushing of
Spillway pipes:
Decant system:
Trash racks clear and in place:
Discharge rate (gpm)
and pipes:
in.
7.5:1
Yes oNo
Yes Yes Yes Yes Yes es No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes
?? feet
feet
Yes ?To
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Yes Igo N/A
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Yes lQ) N/A
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De No N/A
17
pipes
*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.