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indicated by modeling, are located in areas where placement is not expected to <br /> impact floodplain water surface elevations. Consequently, there is no restriction on <br /> length or orientation. The impacts of stockpiles on floodplain water surface <br /> elevations is presented in the Floodplain Use Permit application approved by Adams <br /> County. <br /> Additional mining and reclamation procedures will be used within the regulatory <br /> floodplain to mitigate impacts from potential flood flows. Flood season is considered <br /> to be April 1 through September 30. The southern and eastern slopes of each area <br /> will either be maintained at 31-1:1 V during the flood season during mining or <br /> concurrently reclaimed at 3H:1V with reclamation backfill. This restriction only <br /> applies for areas within 400 feet of the South Platte River in accordance with DRMS <br /> policy. If flood waters reach the mining Areas prior to complete reclamation, the <br /> 31-1:1 V slopes will allow more controlled flow into the Areas while reducing the <br /> potential for head cutting and capture of the South Platte River. <br /> A Floodplain Use Applications have been approved by Adams and Weld Counties for <br /> this project. Adams County may request review and comment from Mile High Flood <br /> District (MHFD). Comments and revisions from the County or the MHFD will be <br /> incorporated into the final Floodplain Use Permit. <br /> The table below illustrates a point in time when the mining disturbance could be at <br /> its maximum. At the proposed Tucson South Resource site, it is assumed that the <br /> mining disturbance will be at its greatest when the East Area mining is nearly <br /> complete. That will be a time when the slurry walls are installed and, topsoil <br /> replacement and initial seeding will be completed for the West Area. <br /> Aggregate Industries—Tucson South Amendment—MLRB 112 Permit Application <br /> Exhibit D-7 <br />