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amec--' <br />C) Remediation <br />A concrete plug was placed at Underground Working #4045. Approximately thirty -two cubic yards <br />of approved concrete from Transit Mix was placed in the previously approved plug, shaped in the <br />shaft. The concrete placement was observed by an AMEC field representative. <br />Remediation of Underground Working #4052 was performed excavating the crown pillar from the <br />working. A portion of the crown pillar was removed during the excavation. The remaining crown <br />pillar will be drilled and collapsed by blasting. <br />Underground Working #4056 was inspected by an AMEC field representative after cut was <br />performed in the area and it was found to be completely removed. The working is considered <br />remediated. <br />Underground Working #4057 was inspected by an AMEC field representative after cut was <br />performed in the area and it was found to be completely removed. The working is considered <br />remediated. <br />A concrete plug was placed at Underground Working #4083. Approximately forty cubic yards of <br />approved concrete from Transit Mix was placed in the previously approved plug, shaped in the <br />shaft. The concrete placement was observed by an AMEC field representative. <br />Underground Working #4086 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. Excavation of the area was performed and signs of a <br />working were present. The timbers and any unsuitable materials were removed and hauled to a <br />stockpile designated by CC &V. Further investigation will continue next week. <br />Investigation of Underground Working #4089 was performed excavating the working. <br />Confirmatory drilling will be necessary to identify the extent of the working. This will be performed <br />when a drill rig is available. <br />Testing of the concrete placed in the Underground Workings was performed by an AMEC field <br />representative. Slump, air entrainment, and temperature testing was performed with results <br />passing. One set of nine 4 "x 8" cylinders were cast for laboratory compressive strength testing. <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 05.12.2012 <br />