HYDRO21851

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 3/13/2000
• Doc Name: QUARTERLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, sediment, or Slurry Impoundments
INSPECTOR'S NAMES Michael Altavilla DATE: 17_/3099
NPDES I.D. NO.: CO-0000221 D. P. 015
FACILITY CONFIGURATION: Croea-Valley Pond DATE LAST INSPECTION: 09/23/99
SITE NAME: Pond i'015 LOCATION: N$~ SEI. c 7~ TSN R88W
MINE NAME: Seneca rr-W Min (_ceneca Coal f,~o1 LOCATION: 8 mi. 5 of Hayden CO
MINE I.D. NO.: CMLRn Permi No -8 -OS7 OWNER'S REP.: Rrad eroWly C-en Mqr
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Foundation preparation (removal of vegetation, stumps, topsoil: es No
Lift thickness: ~2- in
Compaction according to approved plan: es No
Burning (specify extent and location): Yee No
Angle of elope: 2.5:1 upstream, "+.s:l downstream Total = 6:7
*Seepage (specify location, color, and approximate volume)
From underdrain pipee:
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 elope:
Sloughing or bulging on elope:
*Major erosion problems:
Surface movements in valley bottom or on hillside:
*Eroeion of toe:
*Water impounded against toe:

Existing embankment freeboard: a~proximateiy
~ Increase Decrease in water level:
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry su rface:
*Clogging
Spillway channels and pipee:
Decant system:
Diversion ditches:
*Cracking or crushing of pipee
Spillway pipee:
Decant system:

Trash racks clear and in place:
Yes No
Yes
Yee
Yee
Yee o
Yes
Yea
Yee
Yes I~
Yee
Yee
Yes
Yee
7.0 feet
4.0 feet
Yes
Yee No
Yee
Yee No
Yee No
N/A
N/A
N/R
N/A
l~ /~
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
/A
N A
A
Yea ~ N/A
Yes No
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 apace on
the back of this sheet.