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north, which provides no resistive barrier to the avalanches. The avalanches should slide directly <br />on top of the permanent pile without affecting the stability. <br />The avalanches on site in the past have generated air blasts that can damage the buildings such as <br />the dry house. The cribbing located on site helps to protect against this damage. As an additional <br />level of protection, the southeast end of the Revenue waste pile will be built and graded at a <br />vertical position slightly above the rest of the pile, to create a sort of protection berm against the <br />air blast. Once the Revenue waste pile gets high enough, this will no longer be necessary. <br />Sediment Ponds 1 and 2 will contain all run off from the waste piles. The discharges from these <br />ponds will be tested for zinc, lead, and other dissolved metals based on the requirements of the <br />CDPHE stormwater discharge permit. Both ponds are temporary, and will therefore contain the <br />10 -yr event while passing the 25 -yr event. Details of the ponds designs and requirements can be <br />found in Exhibit G. Information regarding the waste rock and tailings chemistry can be found in <br />Exhibit T. <br />Revenue Mine August 2012 D -18 <br />