2011-11-19_REPORT - M1980244 (3)

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ameO Earth 8 Environmental D) Slope Contouring 1) VLF Slope contouring was performed between stations E8 +00 ( + / -) and E10 +00 ( + / -), approximately, 100 to 150 feet right of centerline and between station E16 +00 ( + / -) and E20 +00 ( + / -), approximately 100 to 150 feet right of centerline. Slope contouring was performed using a CAT D -9 dozer. Material generated as the cut progressed was pushed down the slope. E) Overburden to Stockpile 1) VLF Oversize rock within the Phase 5 VLF fill area was removed from fill areas and hauled to the overburden stockpile area east of the east perimeter road near stations A28 +00 ( + / -) to A36 +00 F) Cut to Fill 1) VLF A CAT 385 excavator and a John Deere 850 excavator were used to excavate structural fill material from the following areas: between stations E 15 +00 ( + / -) and E 18 +00 ( + / -), approximately 20 feet left of centerline to 100 feet right of centerline; between stations F 1 +50 ( + / -) and F7 +00 ( + / -), approximately 100 to 150 feet right of centerline; between stations G5 +00 ( + / -) and G7 +00 ( + / -), approximately 250 to 300 feet right of centerline; and between stations H11 +00 ( + / -) and H13 +00 ( + / -), approximately 0 to 50 feet right of centerline. The structural fill material was loaded into CAT 777 haul trucks. Prior to structural fill placement existing fill areas were ripped and frost was allowed to thaw or was removed. Existing fill temperature were monitored and found to be above 32 °F before fill placement. An AMEC representative monitored ambient temperatures on an hourly basis during fill placement. Fill temperatures were monitored during ambient temperatures below 32 °F and averaged 33 °F to 44T. On average, fill preparations were performed for one to one and a half hours before fill temperatures were within project specification. Structural fill was placed in the following areas: between stations B 1 +75 ( + / -) and B7 +00 ( + / -), approximately 100 feet left of centerline to 100 feet right of centerline; between stations C0 +00 ( + / -) and C4 +00 ( + / -) approximately 50 left of centerline to 50 right of centerline; between stations D2 +00 ( + / -) and D4 +75 ( + / -), approximately 50 feet left of centerline to 50 feet right of centerline; and between stations F0 +50 ( + / -) and F7 +00 ( + / -), approximately 100 feet left of centerline to 100 feet right of centerline. Structural fill was placed in 18" to 24" lifts using various CAT dozers. 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 is applicable). Ambient and fill temperatures were monitored and recorded during fill placement. Blast pattern drilling was performed between stations E8 +00 ( + / -) and E11 +00 ( + / -), approximately 50 to 100 feet right of centerline and between station F2 +00 ( + / -) and F4 +00 ( + / -), approximately 50 to 100 feet right of centerline using three track mounted drill rigs. VLF Weekly Report WE 01.09.10.D.doc