2010-11-15_REVISION - M1980244 (111)

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amec Earth & Environmental 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 E) Cut to Fill 1) VLF A CAT 385 excavator, a CAT 375 excavator, and a John Deere 850 excavator were used to excavate structural fill material from the following areas: between stations H 18+00 (+/-) and H22+00 (+/-), approximately 50 feet left of centerline to 50 feet right of centerline; between stations H25+00 (+/-) and H30+00 (+/-), approximately 0 to 100 feet left of centerline; between stations J13+00 (+/-) and J15+00 (+/-), approximately 50 left of centerline to 50 feet right of centerline; and between stations J27+00 (+/-) and J29+00 (+/-), approximately 50 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. 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 457. Structural fill was placed between stations B 1+00 (+/-) and B 11+00 (+/-), approximately 75 feet left of centerline to 75 feet right of centerline and between stations J20+00 (+/-) and J24+00 (+/-), approximately 50 feet left of centerline to 30 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 J24+00 (+/-) and J28+00 (+/-), approximately 30 feet left of centerline to 50 feet right of centerline. Blasting was performed on Monday (2/15/2010), Tuesday (2/16/2010), Wednesday (2/17/2010), and Thursday (2/18/2010). No blasting was performed on Friday (2/19/2010). 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 02.20.10.D.doc