2007-11-30_HYDROLOGY - C1980005

• Permit No: C1980005
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
es DATE: ~ ~ ~~
J
i
INSPE on
s
CTOR'S NAME: Denn
NPDES I.D. NO.: CO-0000221 D.P. 003 DATE LAST INSPECTION:
Diked Pond ~~ ~'- o
FACIL ITY CONFIGURATION:
LOCATION: SEl/, SW'/ Sec
undment #003
I
27 T6N
R87W
SITE mpo
NAME: Northwest
LOCATION: 7 1 mi SE of
Mine (Seneca Coal Co)
Hayden,
CO
MINE NAME: Sezieca II
C-80-005 OWNER'S REP.: Greaa Kitchen Gen
rmit No
D P Mar
MINE .
e
I.D. NO.: CMLR
Circle or write in appropriate response
dation preparation (removal of vegetation, stumps, topsoil: Yes
1. Foun 12 in.
2. Lift thickness: Yes
3. Compaction according to approved plan: No
4. Burning (specify extent and location): downstream
3:1 Total 5:1
5 Angle of slope: 2:1 upstream,
.
6. *Seepage (specify location, color, and approximate volume) ~

From underdrain pipes:
At isolated points on embankment slopes: -
Yes
No
N
N/A
N/A
At natural hillside: yes
Yes o
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
g. Cracks or scarps on slope: Yes No N/A
9. Sloughing or bulging on slope: yes No N/A
10. *Major erosion problems:
n hillside: Yes No N/A
11. Surface' movements in valley bottom or o yes No N/A
12. *Erosiori of toe: Yes No N/A
13. *Water impounded against toe:
' ~-'.~ feet
14. )
Existing embankment freeboard: (normal - 4 9
\
D feet
15 . ^4 ~ ~
Increase Decrease in water level : Ins c- Yes No N/A
16. Cracks, bulging, or erosion on upstream face: N A
17. Visible sumps or sinkholes in slurry surface:
lg . *Cloggi~ig Yes No N/A
Spillway channels and pipes:
Decant system: yes Ido N/A
.'Diversion ditches:
19. *CraCki:ng or crushing of pipes
s• Yes ~ N/A
Spillway pipe N A
Decant system:
Yes No N/A
20. Trash racks clear and in place: ~~
21. Discharge rate (gpm)
*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.