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Confirmatory drilling was performed at Underground Working #4074 using two track mounted drill <br />rigs. A drill pattern was set out by an AMEC field representative. Eighteen holes were drilled <br />encountering six voids. An approximate total of 900 linear feet was drilled. As -built survey of the <br />drill holes was performed by Ames. <br />Confirmatory drilling was performed at Underground Working #4077 using two track mounted drill <br />rigs. A drill pattern was set out by an AMEC field representative. Twelve holes were drilled <br />encountering zero voids. An approximate total of 600 linear feet was drilled. As -built survey of the <br />drill holes was performed by Ames. <br />Grouting of missed (non -void) confirmatory drill holes was performed at Underground Working <br />#4074. A grout pump and laborers were used to place bentonite grout into the "miss" drill holes. <br />Q Remediation <br />Underground Working #4078 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. Excavation of the area was performed and it was <br />found to be a shallow surface working. The native material was found to be consistent and all <br />signs of a significant working were removed. The working was backfilled by placing small lifts and <br />bucket tamping until access for a CAT 563 vibratory smooth drum compactor was achieved. The <br />material was then placed in 18" to 24" lifts. Each lift was moisture conditioned using a tandem <br />axle water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum <br />compactor, passing over the entire fill surface at least 4 times (method compaction technique was <br />applicable). An AMEC field representative observed the remediation of the underground working. <br />Underground Working #4079 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. Excavation of the area was performed and it was <br />found to be a shallow surface working. The native material was found to be consistent and all <br />signs of a significant working were removed. The working was backfilled by placing small lifts and <br />bucket tamping until access for a CAT 563 vibratory smooth drum compactor was achieved. The <br />material was then placed in 18" to 24" lifts. Each lift was moisture conditioned using a tandem <br />axle water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum <br />compactor, passing over the entire fill surface at least 4 times (method compaction technique was <br />applicable). An AMEC field representative observed the remediation of the underground working. <br />Underground Working #4080 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. Excavation of the area was performed and it was <br />found to be a stope running parallel with overburden fill lifts, into the slope. Remediation will be <br />performed when fill progression allows access. <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 />MEW Weekly Report WE 04.21.2012 <br />