2010-11-15_REVISION - M1980244 (113)

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amec Earth & Environmental Slope contouring was performed using various CAT dozers and various CAT excavators. Material generated as the cut progressed was pushed down the slope. D) 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 ( +1 -). E) 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 F1 +00 ( + / -) and F2 +00 ( + / -), approximately 50 to 100 feet right of centerline; between stations H4 +00 ( + / -) and H6 +50 ( + / -), approximately 40 to 125 feet right of centerline; and between stations K0 +00 ( + / -) and K6 +00 ( + / -), approximately 100 feet left of centerline to 50 feet right of centerline. The structural fill material was loaded into CAT 777 haul trucks and hauled to fill areas. Prior to structural fill placement existing fill areas were ripped and frost was allowed to thaw or was removed (when necessary). 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 placement was not performed during ambient temperatures below 32 °F. Structural fill was placed in the following areas: between stations A2 +25 ( + / -) and A3 +75 ( + / -), approximately 50 to 100 feet left of centerline; between stations C0 +00 ( + / -) and C3 +00 ( + / -), approximately 50 feet left of centerline to 50 feet right of centerline; between stations F4 +00 ( + / -) and F10 +00 ( + / -), approximately 0 to 50 feet right of centerline; and between stations J28 +00 ( + / -) and J30 +00 ( + / -), approximately 0 to 75 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). Blast pattern drilling was performed between stations H2 +75 ( + / -) and H7 +00 ( + / -), approximately 100 to 175 feet left of centerline. Blasting was performed on Monday (4/19/2010), Tuesday (4/20/2010), and Wednesday (4/21/2010). No blasting was performed Thursday (4/22/2010), Friday (4/23/2010) and Saturday (4/24/2010). F) Material Processing 1) East Cresson Clay Borrow Area Processing of Soil Liner Fill material continued this week. A CAT D -8 dozer, a CAT 320 excavator, a CAT 966 front -end loader, and tandem -axel haul trucks were used to excavate, haul, and process the material. VLF Weekly Report WE 04.24.10.D