HYDRO20204

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 4/8/2002
• Doc Name: 1st Quarter 2002 Sediment Pond
• 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 Impoun-d7ments
INSPECTOR'S NAME: Dennis Jones DATE: ~ ,a /~ O .Z
NPDES I.D. NO.: N/A
U
FACIL ITY CONFIGURATION: Final Pit Impoundment DATE LAST INSPECTION: _ ` _
SITE NAME: PeCoCo Reservoir LOCATION: SNP/ NWT Sec 2 T5N R87W
MINE NAME: Seneca II Mine (Seneca Coal Col LOCATION: 7.1 mi. SE of Hayden CO
MINE I.D. NO.: CMLRD Permit No. C- 82-057 OWNER'S REP.: Grego Kitchen Gen Mgt
Ci ole o it i a ro riate res one
1. Foundation preparation (removal of vegetation, stumps, topsoil:
2. Lift thickness:
3. Compaction according to approved plan:
4. Burning (specify extent and location):
5. Angle of slope (degrees)
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes:
At natural hillside:
Over widespread areas:
From downstream foundation area:
"Boils" beneath stream or ponded water:
7. Cracks or scarps on crest:
8. Cracks or scarps on slope;
9. Sloughing or bulging on slope:
10. *Major erosion problems:
11. Surface movements in valley bottom or on hillside:
12. *Erosion of toe:
13. *Water impounded against toe:
14. Existing embankment freeboard: (normal = 6.1')
15. Increase Decrease in water level: L. c+ c 4o w~
16. Cracks, bulging, or erosion on upstream face:
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes:
Decant system:
20. Trash racks clear and in place:
Yes
inches
Yes
No
degrees

Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
(~._~_. feet
_ feet
Yes
NL
Yes No
N/A
NL
Yes
~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.