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During construction, the fill will be mounded to account for <br /> estimated settlement. Calculations for expected settlement were <br /> included in Appendix "l-B" of the consolidated permit document. <br /> These calculations allow for a maximum settlement of four feet at <br /> the maximum fill. depth of just over 400 feet. This corresponds <br /> to approximately one foot of settlement for each 100 feet of <br /> fill . The final as-constructed grade will be based on this <br /> factor. <br /> The area below the proposed buffer zone is composed primarily of <br /> the 2580 and 2590 scopes . A mixture of open-pit waste and <br /> material from the Diversion Trench will be used to fill this <br /> void. It is not known whether all of the stockpiled trench rock <br /> will be available for fill . A portion of it may have been buried <br /> under lake sediments during construction of the Diversion Berm. <br /> If this is the case, additional trench rock may be excavated from <br /> the northern end of the trench. As noted above, the material <br /> from the Diversion Trench has a net neutralization potential . By <br /> mixing these two types of rock, any water entering the fill will <br /> be exposed to both types of rock. In addition to this , the water <br /> will contact a large volume of talus (neutralization <br /> potential = +29 . 0) in the bottom of the 2590 stope . This talus <br /> has sloughed into the lake hole as a result of slope instability <br /> caused by underground mining. The talus slope will continue to <br /> slough until it is stabilized naturally or by reclamation of the <br /> lake hole . <br /> - 9 - <br />