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2 i~lovember 14, 2007 <br />Memo to Russ iUleans File No. M-2007-044 <br />Whirlwind Mine Bulkhead Costs <br />Ventilation: <br />Decline portal elevation 7084' lower decline bulkhead elevation 6936' decline driven at 6°% grade <br />2467 linear feet from portal to lower decline bulkhead location <br />Upper decline bulkhead elevation 6950' <br />2233 linear feet from portal to upper decline bulkhead location <br />2350 linear feet (assumed) from Pack Rat portal to contingency bulkhead location <br />Terry Tunnel bulkhead 3800 linear feet (actual) inby the portal. <br />Lower decline bulkhead ventilation reduction factor: 2467/3800 = 0.65 <br />Upper decline bulkhead ventilation reduction factor: 2233/3800 = 0.59 <br />Pack Rat bulkhead ventilation reduction factor: 2350/3800 = 0.62 <br />Note: Since a monitoring period will occur between installation of the tower and upper decli.n.e bulkheads, it <br />is assumed that ventilation will have to be completely re-installed in the decline at the time of upper <br />bulkhead construction. <br />Adjustment from 1996 cost to 2047 casts from Means (2007): <br />Index for 2007 = 166.3 <br />Index far 1996 = 110.2 <br />166.311 i0.2 = 1.5 adjustment factor <br />Bulkhead Installation Labor Estimate includes Overheadua d Profit <br />Task and Cost Item <br />Initial site cleaning 50 hrs. <br />Terry Tunnel <br />Lower Decline Bulkhead 50 x 0.21 = 10.5 hrs. <br />Upper Decline Bulkhead 50 x 0.21 = 10.5 hrs. <br />Pack Rat Bulkhead 54 x 4.37 = 18.5 hrs. <br />Lower Decline Bulkhead 10.5 hrs. $437.33 <br />1 laborer inside ~ $41..65/hr. $437.33 <br />1 laborer outside ~; $~41.65/hr. 10.5 hrs. <br />10.5 hrs. $5'1'2' <br />1 Equip. Op. (light) cr, `~53.~15 <br />l:Jpper C3eclioe Bulkhead $37.33 <br />1 labarer inside ~~ $~ 1.651hr. 10.5 hrs. <br />1.0.5 hrs. $`137.33 <br />1 labor er outside !a; $41.G5/hr. $5~i 1..23 <br />10.5 hrs. <br />1 Equip. Op. (ligh.t) ~~ $53.5 <br />Pack Rat Bulkhead 18.5 hrs. $770.53 <br />1 laborer inside @ $4l .65fhr. 18 5 hrs $,770.53 <br />1 laborer outside @ $41..65(hr. I8.5 hrs. $988.83 <br />1 Equip. Op. (light) tr, $53.5 <br />het: rebar anchors and €inv site craning 5tl hAs. <br />'l`eery 'T'unnel <br />