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

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PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: JO-1~'~~
NPDES I.D. NO.: CO-0000221 D.P. 005
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: ~C'.'~ 3'0
SITE NAME: Pond #005 LOCATION: NWT/, SW'/ Sec. 10 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.: Greg_Q Kitchen, Gen Mar
Circle or write in aQpropriate 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, a d a1pprrrox__imate volume)
5~~
Y
No
N/A
From underdrain pipes: V~(l1Ac~ 19 1~c7 D%GQ 1no es
Yes No N/A
At isolated points on embankme slopes. Y No N/A
At natural hillside: es
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:
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 N N/A
14 Existing embankment freeboard: (normal = 7.4') ~~ feet
.
15. Increase Decrease in water level: ~. feet
16. Cracks, bulging, or erosion on upstream face: Yes IGo N/A
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging
Yes
N/A
Spillway channels and pipes: Yes ~~
No N/A
Decant system: N A
Diversion ditches:
19. *Cracking or crushing of pipes ,
Spillway pipes: Yes
Yes No
No N/A
N/A
Decant system: Yes o N/A
20. Trash racks clear and in place:
y~ ~
~~~' ¢
S ~
~ ~~~`'~ ~`S~~y R
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.