2007-11-30_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/30/2007
• Doc Name: 4th Quarter 2007 Sedimentation Pond Inspections
• 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 Impoundmen''t7s
INSPECTOR'S NAME: Dennis Jones DATE: ~® '3 ~Q
NPDES I.D. NO.: CO-0000221 D.P. 015 C~ ~ /-z _o
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #015 LOCATION: NE1/, SE1/ Sec 23 T5N 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.: Greaa Kitchen, Gen Mgr
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
12
2. Lift thickness:
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 2.5:1 upstream, 3.5:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
Yes
o
At isolated points on embankment slopes:
At natural hillside: Yes No
Over widespread areas: Yes
Yes No
No
From downstream foundation area: Yes No
"Boils" beneath stream or ponded water:
7. Cracks or scarps on crest: Yes No
8. Cracks or scarps on slope: Yes No
9. Sloughing or bulging on slope: Yes No
10. *Major erosion problems: Yes No
11. Surface movements in valley bottom or on hillside: Ye No
12. *Erosion of toe: Yes o
13. *Water impounded against toe:
0')
4 Yes
y~ No
eet
14. .
Exist'ng embankment freeboard: (normal = d
~~ t
f
15. Increase Decrease in water level: ~ ee
o
16 Cracks, bulging, or erosion on upstream face: Yes
.
17. Visible sumps or sinkholes in slurry surface: N~
18. *Clogging
es:
i
d
l
Yes
p
p
s an
Spillway channe N L
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Yes
Igo
Spillway pipes:
Decant system:
es
No
20 Trash racks clear and in lace:
.
21 . I
Discharge rate (gpm) ~a`~'2.~r `QVQI ~- ~ S ~e~.d Ipa~e~.J i.5c ~~
c~lae~~ Se.Q~ =Sax./w•'~-1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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.