2010-07-28_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/28/2010
• Doc Name: 2nd Quarter 2010 Sedimentation Pond Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• Email Name: SB1
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: Pond #016A
MINE NAME: Seneca II-W Mine (Seneca Coal
MINE I.D. NO.: CMLRD Permit No. C-82-057
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: - Yes
2. Lift thickness: in.
3. Compaction according to approved plan:
4. Burning (specify extent and location): No
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
Y
No
N/A
At isolated points on embankment slopes: es
At natural hillside: Yes U N/A
Over widespread areas:
°Q CA .? Si
$ Yes No
No N/A
N/A
L
From downstream foundation area:
"Boils" beneath stream or ponded water: Yes N/A
7. Cracks or scarps on crest: Yes
Y oNo N/A
N/A
8. Cracks or scarps on slope: es
Y N/A
9. Sloughing or bulging on slope: es
10. *Major erosion problems:
ide
S JA
hill Yes
Yes
No N/A
N/A
11. :
s
Surface movements in valley bottom or on Y N/A
12. *Erosion of toe: es
Y CNo) N/A
13. *Water impounded against toe:
1 es
S
y feet
14. , 2008)
Existing embankment freeboard: (normal = 5.4 .
15 Increase Decrease in water level: ?.,o cL.- LvLe feet
.
16. Cracks, bulging, or erosion on upstream face: Yes es N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Yes ??
N/A
Spillway channels and pipes: (
N/A
Decant system:
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Yes
(:0)
N/A
Spillway pipes:
N/A
Decant system: es No N/A
20. Trash racks clear and in place:
21. Discharge rate (gpm) k dw ('?. (69ed c (. Q e?rd o -.:`k Q'C'
*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.
DATE LAST INSPECTION: -3-z- 10
LOCATION: NEl/a SE/4, Sec. 27, TSN, R88W
Co) LOCATION: 8 mi. S of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
DATE : 9-9-10