2010-04-26_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/26/2010
• Doc Name: 1st Quarter 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 #012A
MINE NAME: Yoast Mine(Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-94-082
DATE : 3 - ;9 6 -1 D
DATE LAST INSPECTION: D` -?n
LOCATION: NEl/4 NEY44,Sec. 19, TSN, R87W
LOCATION: 8.5 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
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: Yes
4. Burning (specify extent and location): No
5. Angle of slope: upstream, downstream Total =
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No
At isolated points on embankment slopes: Yes No
At natural hillside: Yes No
over widespread areas: Yes No
From downstream foundation area: Yes No
"Boils" beneath stream or ponded water: Yes o
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: Yes No
12. *Erosion of toe: Yes No
13. *Water impounded against toe: Yes N
14. Existing embankment freeboard: (4.6' when full) > 10 feet
15. Increase Decrease in water level: ? feet
16. Cracks, bulging, or erosion on upstream face: Yes N6
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes:
Yes
Decant system: N/A
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes ®N
Decant system: N/A
20. Trash racks clear and in place: Ye No
21. Discharge rate (gpm) D
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
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. nn
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