2008-04-15_REVISION - M1980244 ‎(365)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/15/2008
• Doc Name: VOL V APP 8 Appendix D- Assessment of Underground Workings within Limits of Phase 5 Valley Leach
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

• a •
GENERAL REMEDIATION PLANS
s
7WIN

1. Excavate/grade surface to finished grade.
olla
psed/Backfilled Shaft
< 25 feet
12' square opening
Above futished grade 2. Excavate collapsed materials to 25 feet or depth of shaft.
3. Backfrll shaft with Select Structural Fill to final Soil Liner Fill subgrade surface.
4. Compact bacldill surface.
ollapsedBackfdled Shaft < 25 feet 12' square opening Below finished grade
1. Drill and blast crown pillar.
Lateral
(option 1)
< 50 fat
< 12 feet wide, < 12 feet big
Na 2. Excavate collapsed materials to 25 feet.
3. Backfill with Coarse Shaft Backfill to within P of the final Soil Litter Fill subgrade surface.
4. Place double layer geogrid cap.
1. Drill flowable fill access holes into crown pillar.
Lateral (option 2) < 50 fat < 12 feet wide, < 12 feet big Na 2. Pump low compressibility, inert flowable fill material into void.
3. Final fill level to be 5' typical above lateral back.
Lateral > 50 > 12 feet wide, > 12 feet hi Na Treat as a scope.
1. Backfill slot with Coarse Shaft Backfrlt, Structural Fill, or Select Structural Fill to within F of
Mine Slot At surface < 3 feet wide Na final Soil Liner Fill subgrade surface.
2. Place double layer geogrid cap.
Mine Slot 1 > 3 feet wide Na Treat as a scope.
Much 2000 Page 2 of 2
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