HYDRO24087

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 10/5/2007
• Doc Name: 3rd Quarter 2007 Sedimentation Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: -f ~~U
NPDES I.D . NO.: CO- 0000221 D.P. 012 "'~
FACILITY CONFIGURATIO N: Cross-Vallev Pond DATE LAST ~_~_ O
INSPECTION: I
SITE NAME : Pond #012 LOCATION: Nom; NW%, Sec. 19 TSN, R87W
MINE NAME : Yoast Mine (Seneca Coal Co) LOCATION: 8.5 mi. SE of Havden CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Gregg Kitchen Gen Mgr
Circle or write in appropriate response
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Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: 12 i n.
Compaction according to approved plan: Yes
Burning (specify extent and location): No
Angle of slope: 3,0:1 upstream, 3.0:1 downstream Total = 6.0 :1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No N/A
At isolated points on embankment slopes: Yes No N/A
At natural hillside: Yes No N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes No N/A
"Soils" beneath stream or ponded water: Yes No N/A
Cracks or scarps on crest: SIA1G ~~~Q,oa So,~ Gygc~S~bto bv~ Yes
N-o N/A
Cracks or scarps on slope: ~
Yes ~NO~ N/A
Sloughing or bulging on slope: Yes No N/A
*Maj or erosion problems: Yes No N/A
Surface movements in valley bottom or on hillside: S ¢ 0`1 s; yes No N/A
*Erosion of toe: Yes No N/A
*Water impounded against toe: Yes No N/A
Existing embankment freeboard: (normal = 9.0') ~ feet
Increase Decrease in water level: Leo ~~.w..n J feet
Cracks, bulging, or erosion on upstream face: Yes No N/A
Visible sumps or sinkholes in slurry s urface: N A
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
Discharge rate (gpm)
Yes ~Tc~ N/A
Yes No N/A
NL
Yes No N/A
Yes N N/A
es 1 ,NO N/A
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*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.