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stockpiles are located in areas where alterations are not expected to impact the flood water surface elevations,their <br /> orientation and length are not restricted such as the stockpiles in active flow areas. A schematic figure <br /> demonstrating the ineffective flow areas around a bridge is presented below. <br /> Cross Section <br /> Contracting Flow �/!. Cross Section <br /> - -- — ross Section <br /> / Ineffective <br /> J Flow Area <br /> (Typical All <br /> Shaded <br /> ' Expanding Flow1w Areas) <br /> / •' , <br /> 1,:Cross Section <br /> ---- -- G <br /> Additional mining and reclamation procedures will be used within the regulatory floodplain to mitigate impacts from <br /> potential flood flows. Flood season is considered to be April 1 through September 30. The southern and eastern <br /> slopes of each area will either be maintained at 31-1:1 V during the flood season during mining or concurrently <br /> reclaimed at 31-1:1 V with reclamation backfill. This restriction only applies for areas within 400 feet of the South Platte <br /> River in accordance with DRMS policy. If flood waters reach the mining Areas prior to complete reclamation,the <br /> 31-1:1 V slopes will allow controlled flow into the Areas while reducing the potential for head cutting and capture of the <br /> South Platte River. <br /> A Floodplain Use Application has been issued by Adams County for this project. Adams County is the regulating <br /> authority on the flood permit; however,Adams County may request review and comment from Urban Drainage and <br /> Flood Control District(UD&FCD). Comments and revisions from the County or the UDFCD will be incorporated into <br /> the final Floodplain Use Permit. <br /> 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 Area mining is nearly <br /> complete. That will be a time when the slurry wall is installed and,topsoil replacement and initial seeding will be <br /> completed for the South and West Areas. <br /> Mine Operation Aspects and Disturbance Areas <br /> Aggregate Industries Tucson South Resource <br /> Permit#M-2004-044 112 Permit Amendment <br /> Page D-6 <br />