HYDRO30469

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 9/20/1996
• Doc Name: QUARTERLY SEDIMENTATION POND INSPECTIONS YOAST 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 NAME: Michael Altavil la DATE: 09 /17/ 96
NPDES I.D. NO.: CO-0000221 D. P. 010
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: N/A
SITE NAME: Pond #010 LOCATION: NWi: NE'/.. Sec. 8. TSN. R87W
MINE NAME: Yoast Mine(Seneca Coal Col LOCATION: 8-5 mi. SE of Hayden. CO
MINE I.D. NO.: CMLRD Permit No. C -94-082 OWNER'S REP.: Brad Brown. Gen Mar
Circle or write in aoorooriate resoonee
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Foundation preparation (removal of vegetation, stumps, topsoil: Yes No
Lift thickness: 8 in.
Compaction according to approved plan: es No
Burning (specify extent and location): Yea No
Angle o£ slope: 3.75:1 upstream, 3.75:1 downstream Total = 7.5:1
*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: Aooroximately
} Increase Decrease in water level:
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Crackitty or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
Yes
Yes
Yes
Yes
Yes o
Yes o
Yes N
Yes No
Yes o
Yes o
Yes N
Yes o
Yes o
10.0 feet
4.0 feet
Yes
Yes No
N/A
N/A
N/A
/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
N/A
N/A
N/A
/A
Yes N~ N
Yes ~ /A
Yes o N A
Yes No N
Yes No A
Yes 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.