2010-10-21_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/21/2010
• Doc Name: 3rd Quarter Pond Inspection Report
• 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.: CO-0000221 D.P. 013
FACILITY CONFIGURATION:
SITE NAME: Pond #013
MINE NAME: Yoast Mine(Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-94-082
DATE : ? - ( 0
DATE LAST INSPECTION: (3 -f 0
LOCATION: SEA/ NWl/,, 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:
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
At isolated points on embankment slopes: Yes No N/A
At natural hillside: Yes N/A
Over widespread areas: Yes (No N/A
From downstream foundation area: $ e&-
Gt( S
Ye
No
N/A
"Boils" beneath stream or ponded water: Yes N/A
7. Cracks or scarps on crest: Yes N/A
8. Cracks or scarps on slope: Yes DNo N/A
9. Sloughing or bulging on slope: Yes N/A
10. *Major erosion problems: Yes N/A
11. Surface movements in valley bottom or on hillside: $ee 0 S' es No N/A
12. *Erosion of toe: Yes No N/A
13. *Water impounded against toe: Yes No N/A
14. Existing embankment freeboard: (normal = 41) -SoS feet
15. Increase / Decrease in water level: J.? feet
16. Cracks, bulging, or erosion on upstream face: Yes io N/A
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes: Yes CN) N/A
Decant system: N/A
Diversion ditches: Yes N/A
19. *Cracking or crushing of pipes VV
Spillway pipes: Yes No N/A
Decant system: N/A
20. Trash racks clear and in place: Yes No N/A
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,
volumeetc.) in the space on the back of this sheet.

Cross-Valley Pond