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Each aspect of the mining operation is listed in the following table with associated disturbed area. The table <br /> illustrates a point in time when the mining disturbance could be at its maximum. At the proposed Tucson South <br /> Resource site, it is assumed that the mining disturbance will be at its greatest when the East cell mining is nearly <br /> complete. The slurry wall will be completed and backfill,topsoil replacement and initial seeding will be completed for <br /> the South and West cells. <br /> Mine Operation Aspects and Disturbance Areas <br /> 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 cell 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 /> B 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 cell 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 /> Total Disturbed 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. The existing grade of the proposed permit area generally drains to the South Platte <br /> River. To manage stormwater runoff,stormwater that falls directly on the affected area will be contained in the <br /> reclaimed reservoirs, upland meadow and active mining cells. The reservoirs and mining cells will effectively contain <br /> Aggregate Industries Tucson South Resource <br /> Permit#M-2004-044112 Permit Amendment <br /> Page D-6 <br />