HYDRO30755

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 12/31/1992
• Doc Name: QTRLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: PEABODY WESTERN COAL CO
• To: MLRD
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR' S NAME: Dennis ,]onec GATE: 12!14192
NPDES I.D. NO.: CO-0000221 D.P. 009
FACILITY C ONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 09/23/92
SITE NAME: Pond #009 LOCATION: SE'/~ SW'/. Sec 11, TSN, R88W
MINE NAME: Seneca Mine II-W Peabody oa Co LOCATION: 8 mi. S of Havden, CO
MINE I.D. NO.: CMLRD Permit No. C-82-057 041NER'S REP.: Scott 4Jilliams. Supt.
Circle or write in a ppropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil): _ es No N/A
2. Lift thickness: 12 in. N/A
3. Compaction according to approved plan: Yes No N/A
4. Burning (specify extent and location): Yes No N/A
5. Angle of slope: 3:1 upstream, 3:1 downstream Total = 6_1 N/A
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: Yes No ' A
At isolated points on embankment slopes: Yes ~jo P1/A
At natural hillside: Yes F~Io~ N/A
Over widespread areas: Yes No N/A
From downstream foundation area: Yes ® N/A
"Boils" beneath stream or ponded water: Yes o P!/A
7. Cracks or scarps~on crest: Yes ~ N/A
8. Cracks or scarps on slope: Yes ~o N/A
9. Sloughing or bulging on slope: Yes ~o N/A
10. *Major erosion problems: Yes N(~o N/A
11. Surface movements in valley bottom or on hillside: Yes ®o N/A
12. *Erosion of tae: Yes ® N/A
13. *Water impounded against toe: Yes Plo N/A
14. Existing embankment freeboard: ~~ feet
15. ~_ Increase Decrease in water level: see comments Z~ feet
16. Cracks, bulging, or erosion on upstream face: Yes No N/A
17. Visible sumps or sinkholes in slurry surface: Yes No N/A
18. *Clogging
Spillway channels and pipes: Yes No N A
Decant system: Yes l:o N A
Diversion ditches: Yes Plo
19. *Craeking or crushing of pipes
Spillway pipes: Yes N P1(g_
Decant system: Yes No /A
20. Trash racks clear and in place: Yes No N/A
*Major adverse changes in these items could cause instability and should be reported to the
Engineering Manager and Mine Superintendent far 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.