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The following structures will be removed at the Packrat Portal area: <br />- Retaining wall, approximately 300 feet in length, with an average height of 8 feet and a <br />maximum height of 22 feet. This wall will be made of steel supports with wood beams. <br />- Concrete jersey barriers of 100 feet total length, which will be hauled off site and re-used. <br />- Up to four steel bins for the loading of ore and waste. These bins will be 22 feet high for truck <br />loading underneath, and an upper bin storage area of 12 feet x 12 feet. <br />- Shop door, approximately 12 feet wide by 8 feet high. This door will be removed and the <br />opening blocked in prior to regrading. <br />No other structures will require removal at the Packrat portal. <br />7. Remove Foundations at Whirlwind and Packrat Portals <br />The shop and dry/admin building rest on concrete foundations that are 60 feet x 43 feet and 20 feet x <br />• 50 feet, respectively. The foundations are 6 inches thick with rebar. This is a volume of 66 cubic yards <br />of concrete. An additional 2.5 cy of rebar-reinforced concrete and 5 cy ofnon-reinforced concrete will <br />be removed at the ore pad sump and helipad, respectively. The material will be removed with a Cat D- <br />7 dozer equipped with a hydraulic concrete breaker or equivalent. The material will be loaded in trucks <br />and hauled underground or off site. <br />The Packrat bins will have up to 16 concrete footers of 3-foot depth and 2-foot diameter. <br />8. Install Bat Gate at Packrat Portal and Seal Shop Area <br />A steel bat gate will be welded into place at the main Packrat portal. An 8-foot by 12-foot block wall <br />will be constructed over the door opening into the underground shop. <br />C, <br />Whirlwind Mine 07 (rev. April 08) E-8 <br />