2012-08-24_REPORT - M1980244 (16)

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subgrade is inspected for organics and debris by an AMEC field representative prior to fill placement (keying into the subgrade). D) Structural Fill Placement A CAT 992 front -end loader and a CAT 993 front -end loader were used to load structural fill material from a borrow area designated by CC &V. The material was loaded into 40 -ton articulating haul trucks and hauled to fill areas. The fill excavation was assisted by various CAT dozers. Structural fill was placed in the areas shown on Figure 1. Structural 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 tandem axle 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 in the fill areas that were close to finish grade. A CAT D -6 dozer excavator was used to performed the slope contouring. Any excess material generated was pulled up into the structural fill placement in the area. F) Soil Liner Fill (SLF) No work performed during the week. G) Drain Cover Fill (DCF) Processing of Drain Cover Fill (DCF) was performed at the DCF process area using a CAT D -9 dozer during night shift. The processed material was hauled to a stockpile area, on Dump 4 designated by CC &V using 40 -ton articulating haul trucks. The stockpile pile was maintained various CAT dozers. Location This Week Cumulative Comments (tons) (tons) DCF Process 35,275 136,865 Total 35,275 136,865 II) Underground Mine Workings A) Discovery During topsoil stripping, an Underground Working was encountered. The working was given a number (UG #4041) by an AMEC representative and surveyed by Ames. Investigation of the working will be performed at a later date. MEW Weekly Report WE 01.28.2012