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Grouting of missed (non -void) confirmatory drill holes was performed at Underground Workings <br />#4073 and #4074. A grout pump and laborers were used to place bentonite grout into the "miss" <br />drill holes. <br />C) Remediation <br />The crown pillar at Underground Working #4039 was removed using a CAT 330 excavator and a <br />John Deere 850 excavator. Observation was performed by an AMEC field representative. The <br />working was completely removed during excavation and competent rock was encountered. The <br />working was backfilled with structural fill in 18" to 24" lifts using various CAT dozers. Each lift was <br />moisture conditioned using a tandem axle water truck (when necessary) and compacted using a <br />10 -ton vibratory smooth drum compactor, passing over the entire fill surface at least 4 times <br />(method compaction technique was applicable). <br />Remediation of Underground Workings #4040, #4046, and #4047 was removed using a CAT 330 <br />excavator and a John Deere 850 excavator. Observation was performed by an AMEC field <br />representative. The working was completely removed during excavation and competent rock was <br />encountered. The working was backfilled with structural fill in 18" to 24" lifts using various CAT <br />dozers. Each lift was moisture conditioned using a tandem axle water truck (when necessary) and <br />compacted using a 10 -ton vibratory smooth drum compactor, passing over the entire fill surface at <br />least 4 times (method compaction technique was applicable). <br />The crown pillar at Underground Working #4080 was removed using a CAT 330 excavator and <br />observation was performed by an AMEC field representative. The working was completely <br />removed during excavation and competent rock was encountered. The working was backfilled <br />with structural fill in 18" to 24" lifts using various CAT dozers. Each lift was moisture conditioned <br />using a tandem axle water truck (when necessary) and compacted using a 10 -ton vibratory <br />smooth drum compactor, passing over the entire fill surface at least 4 times (method compaction <br />technique was applicable). <br />Underground Working #4081 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. The location was staked by the Ames surveyor. <br />Signs of a shaft or stope were encountered in the area during the excavation. Confirmatory drilling <br />will be performed for this working when a drill is available. <br />D) Structures <br />No work performed during the week. <br />III) Geosynthetics <br />A) Geomembrane Installation <br />No work performed during the week. <br />B) Anchor Trench <br />No work performed during the week. <br />C) Geomembrane Exposure <br />No work performed during the week. <br />D) Geomembrane Acceptance <br />No work performed during the week. <br />MEW Weekly Report WE 04.28.2012 <br />