HYDRO24873

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 10/21/2002
• Doc Name: 3rd Quarter 2002 Sedimentation Pond Inspections
• From: Seneca Coal Company
• 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: Dennis Jones DATE: ~-~Z ~ d
NPDES I.D . NO.: CO -0000221 D.P. 015 /~ C
FACILITY CONFIGURATI ON: Cross-Valley Pond DATE LAST INSPECTION: Q 'Z J -
SITE NAME : Pond #015 LOCATION: NEB/, SEA/,, Sec. 23, TSN, R88W
MINE NAME : Seneca II -W Mine (Seneca Coal Co) LOCATION: 8 mi. S of Hayden, CO
.."1INE I.D. NO.: CMLRD Permit No. C-82-057 OWNER'S REP.: Gregg Kitchen, Gen Mgr
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12
3. Compaction according to approved plan: Yes
,. Burning (specify extent and location): No
S. Angle of slope: 2.5:1 upstream, 3.5:1 downstream Total = 6:1
,,. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: 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
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps on crest: Yes No N/A
n. Cracks or scarps on slope: Yes No N/A
~. Sloughing or bulging on slope: Yes No N/A
10. *Maj or erosion problems: Yes No N/A
]. ].. Surface movements in valley bottom or on hillside: Yes No N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: (normal = 4.0') ~ feet
15. Increase ~L Decrease in water level: _
~ feet
16. Cracks, bulging, or erosion on upstream face: Yes ~ N/A
17. visible sumps or sinkholes in slurry surface: N/A
16. *Clogging .
Spillway channels and pipes: Yes No N/A
Decant system: N/A
Diversion ditches: N/A
L9. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: N/A
30. Trash racks clear and in place: 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
L-hese items should normally be described (extent, location, volume, etc.) in the space on the
back of this sheet.