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

03 0
GENERAL REMEDIATTON PLANS

1. Excavate/grade surface to finished grade.
2. Excavate around shaft opening forming 0.5H:1 V minimum.
Open Shaft or Slope > 25 feet 12' square opening Above finished grade 3. Backfill shaft with Coarse Shaft Backfill to 10 feet below final Soil Liner Fill subgrade surface.
4. Cast 3' thick concrete plug in shaft.
5. Backfill final 7 feet with Cemented Rockfill material.
6. Place Structural Fill as needed to finished grade.
1. Excavate around shaft opening forming 0.5H: IV minimum taper in overburden and rock.

Shaft or Slope
> 25 feet
12' square opening
< 7' below finished grade 2. Backfill shaft with Coarse Shaft Backfill to 10 feet below final Soil Liner Fill subgrade.
3. Cast 3' thick concrete plug in shaft.
4. Backfill final 7 feet with Cemented Rockfill material.
5. Place Structural Fill as needed to finished grade.
1. Excavate around shaft opening forming 0.5H:1 V miminum taper in overburden.
2. Backfill shaft with Coarse Shaft Backfill to 3 feet below overburden/rock interface

Open Shaft or Stope
> 25 feet
12' square opening
> 7' below finished grade .
3. Cast 3' thick concrete plug in shaft.
4. Backfill final 7 feet with Cemented Rockfill material.
5. Place Structural Fill as needed to finished grade.
1. Excavate/grade surface to finished grade.
Shallow Open Shaft < 25 feet 12' square opening Above
finished grade 2. Backfll shaft with Select Structural Fill and/or Structural Fill to final Soil Liner Fill lograde
surface.
3. Compact backfill surface.
1. Backfill shaft with Select Structural Fill and/or Structural Fill to existing surface.
Shallow Open Shaft < 25 feet 12' square opening below finished grade 2. Compact backftll surface.
3. Finish grade with Structural Fill.
1. Excavate/grade surface to finished grade.
2. Excavate collapsed materials to 25 feet below final Soil Liner Fill subgrade surface.

ollapsed/Backfilled Shaft
> 25 feet
12' square opening
Above finished grade 2. Excavate around shaft opening forming 0.5:1 V minimum taper.
3. Backfill shaft with Coarse Shaft Backfill to 10 feet below final Soil Liner Fill subgrade surface.
4. Can 3' thick concrete plug in shaft.
5. Backfill final 7 feet with Cemented Rockfilt material.
6. Place Structural Fill as needed to finished grade.
1. Excavate collapsed materials m 25 feet below finished grade.
3. Excavate around shaft opening forming 0.5:1 V minimum taper in overburden and rect.
ollapsed/Backfilled Shaft > 25 fleet 12' square opening < 7' below, finished grade 4. Backfill shaft with Coarse Shaft Backfill to 10 feet below final Soil Liner Fill subgrade.
5. Cast 3' thick concrete plug in shaft.
6. Backfill final 7 feet with Cemented Ruckfill material
,.. _._. .. __ 7. Place Structural Fill as needed to finished grade.

1. Excavate collapsed materials to 25 feet below finished grade.
2. Excavate around shaft opening forming 0.51-1: IV minimum taper in overburden.
CollapsedBackfilled Shaft > 25 feet 12' square opening > 7' below finished grade 3. Backfill shaft with Coarse Shaft Backfill to 3 feet below overburden/soil interface.
'
4. Cast 3
thick concrete plug in shaft.
5. Backfill final 7 feet with Cemented Rockfill material.
6. Place Structural Fill as needed to final grade.
March 2000 Page 1 of 2
ry. m+ww?ntow,r Golder Assoelotes 993-2099.150