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Mine Phasing Aggregate Industries anticipates mining and reclaiming the proposed Tucson South Resource site in approximately 5 to 10 years. The rate of mining and overall life of the mine is dependent on several factors including product demand and operational needs. Test pits have verified that commercial deposits of sand and gravel exist up to 50 feet below the surface of the ground. In addition to the commercial sand and gravel materials,clay,silt,and other non- marketable materials excavated from the proposed permit area will be used on-site for reclamation. The mining plan currently includes mining in three phases. Mining will occur simultaneously in more than one phase. The actual sequence may change depending on market conditions,operational needs,or site conditions: • South Area(Phase 1), is located south of State Highway 7,and included Tract I • West Area(Phase 3), is located north of Highway 7 and west of Tucson Street and included Tracts A, B and C • East Area(Phase 2)is north of Highway 7 and east of Tucson Street and includes Tracts D, E, F, G and H Tract J will contain the conveyor to carry product off-site to the processing facility at the Wattenberg Lakes Site and will be used during all mining phases. Mining will begin in the South Area(Phase 1, 24.3 acres)and mined from the east to the west utilizing a dry mining technique(i.e.dewatering). Al is committed to installing cisterns on wells near the South Mine area to mitigate impacts to water wells in the area. See Exhibit G for details. Material will be transported across Highway 7 and follow the approved haul route to the Wattenberg Lakes Mine(M-2004-051). Processing and sale of the material will occur on the Platte Valley site(M-1989-120). When mining in the South Area is complete,overburden from the West and East Areas will be trucked across Highway 7 and used to back fill the South Area to create an upland meadow. A slurry wall will be constructed around the East and West Areas prior to exposure of the water table.The final design of the slurry wall is pending and will be provided to the DRMS prior to exposing the water table, Al is committed to installing an underdrain system along the south,west and north sides of the West Mine area to maintain the hydrologic balance of the ground water regime. See Exhibit G and Appendix G for details. The West Area(Phase 3,88.6 acres)will be mined from south to north. The East Area(Phase 2-139.6 acres)will be mined from south to north. All necessary permits will be obtained,and any required special construction techniques will be used prior to disturbance in any jurisdictional Waters of the U.S. A summary of mining phases is presented in the following table. Mine Phasing Summary Mine Phase Total Acreage Duration To be mined acres ears South 13.6 2 West 67.0 4 East 79.8 4 Total 163.2 10 _::J Mining Methods There will be two methods of mining used within the permit boundary: Aggregate Industries Tucson South Resource Permit#M-2004-044112 Permit Amendment Page D-3