2012-08-24_REPORT - M1980244 (11)

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ameO D) Overburden Fill Placement Overburden fill material was delivered from CC &V Mine Operations throughout both day and night shifts. An Ames CAT D -10 dozer was used to maintain the borrow area. A CAT 993 front -end loader and a CAT 992 front -end loader was used to load overburden fill material into CAT 40 -ton articulating and CAT 777 haul trucks. Loose, unconsolidated material from below Underground Working #4043 (Morning Glory) was loaded into CAT 740 articulating haul trucks using a John Deere 850 excavator. The material was hauled and placed as overburden fill. Overburden fill was placed in the areas shown on Figure 1. A CAT 330 excavator and a CAT 312 excavator with a hammer attachments "broke up" oversize boulders before they were placed in the fill. Overburden fill was placed in 18" to 24" lifts using various CAT dozers, keying into existing slopes when necessary. Each lift was moisture conditioned using a CAT 773 water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum compactor, passing over the entire fill surface at least 4 times (method compaction technique was applicable). Subgrade temperatures were monitored by an AMEC field representative prior to fill placement. Fill material was not placed until the entire fill area was at or above 32 °F. Fill temperatures were then monitored every hour during ambient temperatures below 32 °F. No frozen material was placed during the week. E) Slope Contouring Slope contouring was performed using a CAT 345 excavator. Material generated during slope contouring was placed as overburden fill at the top of the slope. F) Soil Liner Fill (SLF) No work performed during the week. G) Drain Cover Fill (DCF) No work performed during the week. Location This Week Cumulative Comments DCF Process - 158,613 DCF processing is temporarily paused Total - 158,613 DCF processing is temporarily paused H) Underdrain Construction of the Secondary Underdrain continued excavating approximately 780' of a 3'x4' trench along the surveyed alignment using a CAT 345 excavator. Secondary underdrain installation was performed installing 12 oz/yd2 geotextile and a 2' lift of Underdrain Filter Material (UFM) was then placed in the trench, "burrito wrapping" the UFM material with the geotextile. A 6- inch lift of select structural fill (SSF) was then placed over the geotextile using a CAT 950 front - end loader. The SSF material was moisture conditioned and compacted using a vibratory plate compactor. Approximately 330 linear feet of secondary underdrain was completely installed. Overburden fill placement was then performed over the underdrain. Underdrain construction was observed by an AMEC field representative and found to be constructed in accordance with design drawings and project specifications. MEW Weekly Report WE 03.10.2012