HYDRO25228

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/1996
• 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 NAME: Michael Altavilla DATE: 03/11/96
NPDES I.D. NO.: CO-00002 21 D.P. 009
FACILITY C ONFIGURATION: Cr oss-Valley Pond DATE LAST INSPECTION: 12/04/95
SITE NAME: Pond #009 LOCATION: SEE: SWY.. Sec. 11. TEN. R88W
MINE NAME: Seneca II-W Min e (Seneca Coal Co) LOCATION: 8 mi. S of Hayden. CO
MINE I.D. NO.: CMLRD Permit No. C-82.057 OWNER'S REP.: Brad Brown. Gen Mar
Circle or write in aonrovriate resnonae
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Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: 2
Compaction according to approved plan: es
Burning (specify extent and location): Yes
Angle of slope: 3:1 upstream, 3:1 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 water:
Cracks or scarps on crest:
Cracks or scarps on elope:
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: No chance
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogginq
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Crackinq or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
No N/A
_~ in. N/A
No N/A
No
6:1 N/A
Yes No N/
Yes A
Yes N/A
Yes N/A
Yes N/A
Yes N/A
Yes o N/A
Yes o N/A
Yes o N/A
Yes o N/A
Yes o N/A
Yes N/A
Yes No NJA
10 feet
_ feet
Yes ®o N/A
Yes No /A
Yes
Yes No
Yes No /A
Yes No N A
Yea o
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.