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Ms. Anne Beierle Page 3 September 12, 2002 <br />Snow Shed <br />Originally in 1997 a 3200 foot long concrete enclosure for avalanche protection was <br />planned. Instead, a 2650 foot long structure was built. The redesigned structure has a <br />concrete roof resting on W18 girders, concrete block inner wall, and an outside wall <br />consisting of W8x31 steel columns spaced on 25 foot centers. The approach to cost <br />estimating for demolition of the snow shed changed from 1997 because of the changes in <br />construction. Now, it is assumed the W8x31 columns and W18 girders will be sheazed <br />off with a Cat 225 excavator mounted with a MSD50 demolition sheaz. By removing the <br />steel support, the roof will collapse and another Cat 225 with a wrecking ball will be used <br />to break the remaining concrete. A Cat 330E excavator and a D7 dozer will be used to <br />rubblize all concrete in place and provide compaction of the demolition debris. Onsite <br />fill from the access road will be "pulled up" by the excavator and spread out with the <br />dozer. EEE has experience with this approach to demolishing structures at the Horizon <br />Mine in New Mexico, and much of the productivity and cost data were obtained from that <br />experience in 1997. <br />The revised cost for demolishing the snow shed, rubblizing concrete, compacting, and <br />covering in place is estimated at $51,129. See Appendix 3. <br />Structures at Con3 -Wetland Crossing <br />The conveyor traverses a span of approximately 1000 feet between stations 143 and 153 <br />on an elevated section consisting of various sized bents and trusses. For purposes of <br />costing this series of bents and trusses, it was assumed that the $0.13/cu ft could be used <br />for demolition. The volume was determined to be 110,291 cu ft, using an "average end <br />area method" whereby the cross-sectional azea of the bents was multiplied by the <br />sepazation distance. Foundations will be left in place per requirements of the Corps of <br />Engineers 404 Permit. The revised cost of demolition of structures (including removal of <br />foundations) at Con3 is $14,338. See Appendix 4. <br />Structures at Con9 -Stream Crossine <br />Demolition of structures at Con9 is very similar to Con3. For purposes of the demolition <br />cost estimate, it was assumed that the $0.13/cu ft unit cost would apply. The volume was <br />determined to be 130,735 cu ft by the "average end area method." Foundations will be <br />left in place per requirements of the Corps of Engineers 404 Permit. The revised cost of <br />demolition of structures (including removal of foundations) at Con9 is $19,966. See <br />Appendix 5. <br />