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cw <br />September 14, 2012 <br />Ms. T. J. Wait <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 / <br />V <br />7-X?V) 3 <br />RECEIVED <br />SEP 18 2012 <br />70 Division of Reclamation, <br />Mining & Safety <br />Re: Technical Revision to Permit # M -1977 -559 Canon City East Pit <br />Dear Ms. Wait: <br />In answer to your letter dated 9/10/2012: <br />VALCO, INC. <br />CORPORATE OFFICE <br />12753 S Parker Road, <br />Suite # 203 <br />Parker, CO 80134 <br />(303) 248 -3590 <br />a) Describe the approximate location of the proposed activity. See highlighted areas on <br />the enclosed map. <br />b) The approximate volume of inert material to be backfilled. That is to be determined <br />based on availability. <br />c) A signed affidavit certifying that the material is clean and inert. The material will be <br />inspected and certified before placement in the pit. <br />d) The approximate dates the proposed activity will commence and end, however, such <br />dates shall not be an enforceable condition. Placement could occur in the summer of <br />2013 along with final reclamation sloping. <br />e) An explanation of how the backfilled site will result in a postmining configuration that <br />is compatible with the post mining use. The result of the backfilling will result in less <br />lake surface, however, it will have no effect on the postmining land use. <br />f) A general engineering plan stating how the material will be placed and stabilized in a <br />manner to avoid unacceptable settling and voids. When backsloping is done the water <br />table in the ponds will be reduced by dewatering to a level that the inert material can <br />be placed in the slopes and wheel compacted and covered with overburden. When the <br />required slopes are finished the dewatering operation will be stopped and the natural <br />water level will return. In some cases the inert material helps the stability of the slopes <br />especially in areas where there are large amounts of fine granular material. <br />Please contact me with any questions. <br />Sincerely, <br />Valco, Inc. <br />jlq�b� 9 JJA.� <br />Thomas E. Brubaker <br />President <br />