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• Labor costs have increased over time. A list of the current labor costs for Energy <br />Fuels is presented in Attachment C. <br />• The dimensions of the bulkheads (perimeter area, perimeter length, cross sectional <br />area, volume). <br />• The distance to the bulkheads from the portal affects the productivity during <br />construction and therefore affecting the cost of construction. <br />• The costs of materials have gone up since the Terry Tunnel was constructed in <br />1996 although fewer materials are needed. <br />• The Terry Tunnel had a significant amount of flowing water that had to be dealt <br />with during the seal installation. The Whirlwind seal does not have that problem. <br />This reduces the amount of pumping that will be needed and removes the need for <br />a bypass pipe during construction. <br />• The Terry Tunnel was designed for 347 feet of head and the Whirlwind bulkhead <br />is designed for 38 feet (although the actual design would handle 147 feet). <br />• A smaller bulkhead needs fewer materials and less labor to build. It also requires <br />less engineering, auxiliary equipment, bracing, timber, etc. <br />• Energy Fuels believes the seal can be formed and poured in 2 weeks, which is <br />about half the time required for the Terry Tunnel. <br />• A number of other minor items described in the cost estimates. <br />• <br /> <br />4