HYDRO30098

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 11/18/2004
• Doc Name: 3rd Quarter 2004 Quarterly Sedimentation Pond Inspection
• 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 Imppou~n2dments ~(
' INSPECTOR'S NAME: Dennis Jones DATE: O ~ J ~~ ~ I
NPDES I.D . NO.: CO-0000221 D.P. 005

FACILITY CONFIGURATION: Cross-Vallev Pond
DATE LAST ~_ l
INSPECTION: l ~ O 1
l
SITE NAME: Pond #005 LOCATION: NW'/, SW~/„ Sec. 10. 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 REP.: Gre ag Kitchen, Gen Mar
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: Yes No N/A
At isolated points on embankment slopes: Yes No N/A
At natural hillside: Yes No N/A
Over wideSp read areas: Yes No N/A
From downstream foundation area: Yes No NfA
"Boils" beneath stream or ponded water: Yes No N/A
7. Cracks or scarps oR 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. *Maj or erosion problems: Yes NO NjA
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: Y
es N N/A
14. Existing embankment freeboard: (normal = 7.4') ~
u
w•~ feet
15. Increase __X__ DOCrease iri writer level: eZ•~ feet
16. Cracks, bulging, or erosion on upstream face: Yes No NjA
17. Visible sumps or sinkholes in slurry surface: N A
18. *Clogging
Spillway channels and pipes: Yes No N/A
Decant system: Yes No N/A
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: Yes No N/A
20. 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
these items should normally be described (extent, location, volume, etc.) in the space on the
back of this sheet.