2012-08-24_REPORT - M1980244 (10)

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amet_- encountering seventeen voids. An approximate total of 1,250 linear feet was drilled. As -built survey of the drill holes was performed by Ames. Grouting of missed (non -void) confirmatory drill holes was performed at Underground Workings #4073 and #4081. A grout pump and laborers were used to place bentonite grout into the "miss" drill holes. C) Remediation Remediation of Underground Working #4045 was performed placing the concrete plug in the working. Seven feet of cemented rock fill was placed on top of the previously placed concrete. An AMEC field representative observed cemented rock fill. Remediation of Underground Workings #4052 and #4058 was performed excavating the crown pillar from the working. A portion of the crown pillar was removed during the excavation. The remaining crown pillar will be drilled and collapsed by blasting. Remediation of Underground Working #4077 (The Wedge) was performed using a John Deere excavator to remove timbers and unsuitable material from the working. Coarse shaft backfill placement was then performed filling the open shaft. The working was backfilled to approximately 10 feet from the existing ground surface. The sides were then shaped with 05V:1 H slopes preparing the shaft for concrete plug installation. An AMEC field representative observed the backfill and inspected the shaped upper portion of the shaft. It was found to be acceptable for concrete placement. Approximately twenty cubic yards of approved concrete from Transit Mix was placed in the plug. The concrete placement was observed and tested by an AMEC field representative. Slump, air entrainment, and temperature testing was performed with results passing. One set of nine 4 "x 8" cylinders were cast for laboratory compressive strength testing. The crown pillar at Underground Working # 4081 was collapsed by blasting. A CAT 330 excavator was used to excavated the collapsed crown pillar from the working. An AMEC field representative observed the remediation activities. D) Structures No work performed during the week. III) Geosynthetics A) Geomembrane Installation No work performed during the week. B) Anchor Trench No work performed during the week. C) Geomembrane Exposure No work performed during the week. D) Geomembrane Acceptance No work performed during the week. 1V)Storm Water Management A) Best Management Practices (BMP) Best Management Practices are being observed throughout the Mill Site Earthworks project. MEW Weekly Report WE 05.19.2012