HYDRO26997

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 9/23/1996
• Doc Name: 3rd Qtr 1996 Sediment Pond Inspections
• 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: 09 /18/96
NPDES I.D. NO.: CO-0000221 D.P. 009
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 06/05 /96
SITE NAME: Pond #009 LOCATION: SES: SWS:. Sec. 11. TSN. R88W
MINE NAME: Seneca II-W Mine (Seneca Coal Co) LOCATION: 8 mi. S of Hayden. CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S RE P.: Brad Brown. Gen Mar
Circle or write in appropriate response
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Foundation preparation (removal of vegetation, stumps, topsoil: es No N/A
Lift thickness: 12 in. N/A
Compaction according to approved plan: _ _-.,_ ~ No N/A
Burning (specify extent and location): Yes No /A
Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1 N/A
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No /
At isolated points on embankment slopes: Yes N A
At natural hillside: Yes o N/A
Over widespread areas: Yes N/A
From downstream foundation area: Yes N/A
"Boils" beneath stream or ponded water: Yes ~ N/A
Crac::= cr scarps on crest: Yes ® :d,A
Cracks or scarps on slope: Yes ® N/A
Sloughing or bulging on slope: Yes ® N/A
•Maj or erosion problems: Yes N/A
Surface movements in valley bottom or on hillside: Yes N/A
Erosion of toe: Yes N/A
*Water impounded against toe: Yes o N/A
Existing embankment freeboard: Approximately 9.9 feet
Increase X Decrease in water level: 3.0 feet
Cracks, bulging, or erosion on upstream face: Yes ~ N/A
Visible sumps or sinkholes in slurry surface: Yes No
Clogging

Spillway channels and pipes:
Yes ~~
~moJ
N A
Decant system: ~ Yea o
Diversion ditches: Yes No A
'Cracking or crushing of pipes
Spillway pipes: Yes ~ I~„~
Decant system: Yes No ~~7/7~J
Trash racks clear and in place: ~ No N/A
+Maj or 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.