2007-11-30_HYDROLOGY - C1994082

• Permit No: C1994082
• 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
NPDES I.D. NO.: CO-0000221 D.P.
FACILITY CONFIGURATION: Cross-Val
SITE NAME;: Pond #O11
MINE NAME;: Yoast Mine (Seneca Coal
MINE I.D. NO.: CMLRD Permit No. C
DATE : D
Oll
ley Pond DATE LAST INSPECTION: "- _°_
LOCATION: NE1/, SWl/,Sec. 16, T5N, R8 W
Co) LOCATION: 8.5 mi. SE of Hayden, CO
-94-082 OWNER'S REP.: Grec{g Kitchen, Gen Mgr
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 8 in .
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3.0:1 upstream, 2.8:1 downstream Total = 5.8:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No N/A
At isolated points on embankment slopes: Yes No N/A
At natural hillside: 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: Yes No N/A
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/A
14. Existing embankment freeboard: (normal = 5.1') _~ feet
15 . Increase Decrease in water level : tr1,c~ ~ ~.rro~ feet
16. Cracks, bulging, or erosion on upstream face: Yes loo N/A
17. Visible sumps or sinkholes in slurry surface: NL
18. *Clogging
Spillway channels and pipes: Yes ~ N/A
Decant system:
Diversion ditches:
19. *Cra.cking or crushing of pipes
Spillway pipes: Yes No N/A
Decant system: N/A
20. Trash racks clear and in place: Yes No N/A
21 . ff rr /~ ~
Discharge rate (gpm) (~` c.~~~v ~eV~l oC~C,. ~ ~'F' W~~ i,s vvty~
*Major adverse changes in these items could cause instability and should be reported to
the Engineering Manager and Mine Superintendent for further evaluation. Adve rse
condi tions noted in these items should normally be described (extent, location, volu me,
etc.) in the space on the back of this sheet.