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Disturbed <br /> Aspect Mining Operation Area <br /> (acres) <br /> Active Mining Area: Near vertical 800-foot active mining face and 100-foot wide pre- <br /> stripped area in anticipation of mining. <br /> A <br /> 1. Mining highwall and adjacent Area walls 1,500 feet in length averaging 27 feet 30 <br /> deep requiring backfill and rough grading to 3H:1 V slopes. <br /> 2. Topsoil replacement. <br /> Dewatering: Settling ponds are shown on Exhibit C Mining Maps.The locations of the <br /> settling ponds will vary for each mining area; however,for reclamation cost estimating <br /> the maximum settling pond size is 5 acres. The maximum dewatering trench <br /> g constructed or disturbed at any given time is 54 feet wide, 30 feet deep and <br /> approximately 10,600 linear feet. <br /> 1. Settling 5 <br /> 2. Dewatering Trench 13 <br /> Miscellaneous Disturbed Areas for scarifying and topsoil: <br /> C 1. Internal haul route and main site entrance. 3 <br /> 2. Stockpile areas. 5 <br /> 3. Off Site Conveyor 3.3 <br /> Final Reclamation: <br /> D 1. Seeding—entire East Area above the highwater line of the reservoir plus internal 73 <br /> haul route and the conveyor route. <br /> 2. Weed management and re-seeding (20%of the Affected Lands located above 22 <br /> the hi hwater line of the reservoirs <br /> 1!n turbed Area 95 <br /> Diversions and Impoundments <br /> Roads and irrigation ditches will effectively minimize stormwater surface run-on to the mining site,so run-on diversion <br /> structures are not anticipated. During the initial mining activities, stockpiling of topsoil and overburden on the <br /> surface is anticipated. Diversionary channels, as shown on Exhibit C,will be used divert surface runoff from leaving <br /> each of the Areas or entering the wetlands areas. Surface diversion channels will convey runoff to settling ponds, <br /> prior to discharging to the South Platte River. As mining progresses and the excavation increases in size, <br /> diversionary channels will convey less runoff because more runoff will enter the mine excavations. Runoff that <br /> collects in the excavations will be conveyed by the dewatering trenches to a common point,where it will be pumped <br /> to the river after sediment settling has occurred, if necessary. <br /> Material Processing and Associated Facilities <br /> Aggregate Industries Tucson South Resource <br /> Permit#M-2004-044 112 Permit Amendment <br /> Page D-7 <br />