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Memo to Russ Means 2 November 14, 2007 <br />Whirlwind Mine Bulkhead Costs File No. M-2007-044 <br />Ventilation: <br />Decline portal elevation 7084' lower decline bulkhead elevation 6936' decline driven at 6% grade <br />24671inear feet from portal to lower decline bulkhead location <br />Upper decline bulkhead elevation 6950' <br />22331inear feet from portal to upper decline bulkhead location <br />23501inear feet (assumed) from Pack Rat portal to contingency bulkhead location <br />Terry Tunnel bulkhead 38001inear 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 lower and upper decline 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 2007 costs from Means (2007): <br />Index for 2007 = 166.3 <br />Index for 1996 = 110.2 <br />166.3/110.2 = 1.5 adjustment factor <br />Bulkhead Installation Labor Estimate, includes Overhead and Profit <br />Task and Cost Item Ouantity Extended Cost <br />Initial site cleaning <br />Terry Tunnel 50 hrs. <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 50 x 0.37 = 18.5 hrs. <br />Lower Decline Bulkhead <br />1 laborer inside @ $41.65/hr. 10.5 hrs. $437.33 <br />1 laborer outside @ $41.65/hr. 10.5 hrs. $437.33 <br />1 Equip. Cp. (light) @ $53.45 10.5 hrs. $561.23 <br />Upper Decline Bulkhead <br />1 laborer inside @ $41.65/hr. 10.5 hrs. $437.33 <br />1 laborer outside @ $41.65/hr. 10.5 hrs. $437.33 <br />1 Equip. Op. (light) @ $53.45 10.5 hrs. $561.23 <br />Pack Rat Bulkhead <br />1 laborer inside @ $41.65/hr. 18.5 hrs. $770.53 <br />1 laborer outside @ $41.65/hr. 18.5 hrs. $770.53 <br />1 Equip. Op. (light) @ $53.45 18.5 hrs. $988.83 <br />Set rebar anchors and fine site cleaning <br />Terry Tunnel <br />50 hrs. <br />