Laserfiche WebLink
ame <br />Earth & Environmental <br />F) Cut to Fill <br />1) VLF <br />A CAT 385 excavator and a John Deere 850 excavator were used to excavate structural fill <br />material from the following areas: between stations E15+00 (+/-) and E18+00 (+/-), <br />approximately 20 to 50 feet left of centerline; between stations F2+50 (+/-) and F4+00 (+/-), <br />approximately 75 to 300 feet right of centerline; between stations 119+00 (+/-) and 1-110+00 <br />(+/-), approximately 75 to 100 feet left of centerline; and between stations H25+00 (+/-) and <br />H26+50 (+/-), approximately 200 to 275 feet left of centerline. The structural fill material was <br />loaded into CAT 777 haul trucks. <br />Prior to structural fill placement existing fill areas were ripped and frost was allowed to thaw <br />or was removed. Existing fill temperature were monitored and found to be above 32°F before <br />fill placement. An AMEC representative monitored ambient temperatures on an hourly basis <br />during fill placement. Fill temperatures were monitored during ambient temperatures below <br />32°F and averaged 39°F to 41 °F. On colder days preparations were performed for two to three <br />hours before fill temperatures were within project specification. <br />Structural fill was placed in the following areas: between stations B1+50 (+/-) and B4+50 (+/-), <br />approximately 0 to 150 feet left of centerline; between stations D0+50 (+/-) and D4+00 (+/-), <br />approximately 100 feet left of centerline to 100 feet right of centerline; and between stations <br />F0+50 (+/-) and F2+00 (+/-), approximately 200 feet left of centerline to 200 feet right of <br />centerline. Structural fill was placed in 18" to 24" lifts using various CAT dozers. Each lift was <br />moisture conditioned using a CAT 773 water truck (when necessary) and compacted using a <br />10-ton vibratory smooth drum compactor, passing over the entire fill surface at least 4 times <br />(method compaction technique is applicable). Ambient and fill temperatures were monitored <br />and recorded during the placement of the processed ore in this area. <br />Structural fill (processed ore) was placed within the Phase IVa VLF between stations G15+00 <br />(+/-) and G29+00 (+/-), approximately 75 to 150 feet right of centerline. Fill material <br />(processed ore) was excavated from the Phase IVc re-certification area, the old LOB haul road, <br />and the southeast corner of Phase IVa using a CAT 375 excavator loading the material into 40- <br />ton articulating haul trucks. Structural fill was placed using a CAT D-8 dozer in 12" loose lifts <br />and moisture conditioned as needed using a CAT 773 water truck. Compaction was achieved <br />using a 10-ton vibratory smooth drum compactor. Nuclear density testing was performed with <br />results averaging 95% of maximum dry density. Moisture density relations were obtained in <br />accordance with ASTM D698-07. Ambient and fill temperatures were monitored and recorded <br />during the placement of the processed ore in this area. <br />Blast pattern drilling was performed in the following areas: between stations E15+00 (+/-) and <br />E18+00 (+/-), approximately 0 to 100 feet left of centerline; between station F2+00 (+/-) and <br />F4+00 (+/-), approximately 200 to 250 feet left of centerline; between stations G9+00 (+/-) and <br />G10+00 (+/-), approximately; and between stations H9+25 (+/-) and H11+00 (+/-), <br />approximately 0 to 10 feet left of centerline using three track mounted drill rigs. Blasting was <br />performed in these areas Monday (11/30/2009), Tuesday (12/1/2009), Wednesday (12/2/2009), <br />and Thursday (12/3/2009). <br />VLF Weekly Report WE 12.05.09.D.doc