2009-10-29_HYDROLOGY - C1982057 ‎(2)‎

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/29/2009
• Doc Name: 3rd Quarter 2009 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Email Name: DTM
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO-0000221
D.P. 005
DATE: q--(? 1-0
DATE LAST INSPECTION: 6' q
LOCATION: NWY44 SW%, Sec. 10, TSN, R88W
LOCATION: 8 mi. S of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: Pond #005
MINE NAME: Seneca II-W Mine (Seneca Coal Cc)
MINE I.D. NO.: CMLRD Permit No. C-82-057
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3.5:1 upstream, 2.5:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: ?e55 cc.?(p stn es No N/A
At isolated points on embankment slopes: Yes o 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
8. Cracks or scarps on slope: Yes No N/A
9. Sloughing or bulging on slope: Yes No N/A
10. *Major erosion problems: Yes No N/A
11. 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 o N/A
14. Existing embankment fx'eeboard: (normal = 7.41) _ feet
15. Increase U Decrease in water level: feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes: Yes N/A
Decant system: Inoperable 34a= NQ N/A
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: Inoperable Yom. No N/A
20. Trash racks clear and in place: No N/A
21.
?c?
Discharge rate (gpm) .DA IwAtzs
yQ
*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.