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t <br /> Mine Phasing <br /> Aggregate Industries anticipates mining and reclaiming the proposed Tucson South Resource site in approximately 5 <br /> to 10 years. The rate of mining and overall life of the mine is dependent on several factors including product <br /> demand. Test pits have verified that commercial deposits of sand and gravel exist up to 46 feet below the surface of <br /> the ground. In addition to the commercial sand and gravel materials,clay,silt, and other non-marketable materials <br /> excavated from the proposed permit area will be used on-site for reclamation. <br /> The mining plan currently includes mining in three phases: <br /> • South(Phase 1), is located south of State Highway 7, and included Tract I <br /> • West(Phase 3), is located north of Highway 7 and west of Tucson Street and included Tracts A, B and C <br /> • East(Phase 2) is north of Highway 7 and east of Tucson Street and includes Tracts D, E, F, G and H <br /> Tract J will contain the conveyor to carry product off-site to the processing facility at the Wattenberg Lakes Site and <br /> will be used during all mining phases. <br /> The South mining cell (Phase 1, 24.3 acres)will be mined from the east to the west utilizing a wet mining technique. <br /> Material will be transported across Highway 7 to the designated area in the West mining cell to await transport to the <br /> Wattenberg Lakes Mine(M-2004-051). Processing and sale of the material will occur on the Platte Valley site(M- <br /> 1989-120). When mining in the South cell is complete,overburden from the West cell will be trucked across Highway <br /> 7 and used to back fill the area to create an upland meadow. The West mining cell (Phase 3, 88.6 acres)will be <br /> mined from south to north. The East mining cell(Phase 2- 139.6 acres)will be mined from south to north. All <br /> necessary permits will be obtained, and any required special construction techniques will be used prior to disturbance <br /> in any jurisdictional Waters of the U.S. A summary of mining phases is presented in the following table. <br /> Mine Phasing Summary <br /> Mine Phase Total Acreage Duration <br /> To be mined acres ears <br /> South 14.7 2 <br /> West 69.2 4 <br /> East 79.3 4 <br /> Total 163.2 10 <br /> The Tucson Resource Mine will be mined in three phases with five mining cells. Mining will be integrated with <br /> concurrent reclamation activities. As mining progresses in the South cell(Phase 1), it is anticipated that a slurry wall <br /> encompassing the East cell(Phase 2)and West cell(Phase 3)will be constructed. South cell side slopes will be <br /> created from South cell overburden material and rough graded to create minimum of 3H:1V slopes as mining <br /> progresses in the South cell. The South cell will be backfilled with overburden from the West and East cells to create <br /> an upland meadow as mining proceeds in the West and East cells. <br /> Mining Methods <br /> There will be two methods of mining used within the permit boundary: <br /> • Phase 1 will be mined using excavators,transport trucks, and active dewatering during mining. Topsoil will <br /> be stripped and stockpiled in locations shown on the Exhibit C Mining Maps. Material will be excavated and <br /> Aggregate Industries Tucson South Resource <br /> Permit#M-2004-044112 Permit Amendment <br /> Page D-3 <br />