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proposed permit boundary may be removed during the mining process. The applicant owns <br />these items potentially being removed. <br />Mine Phasine <br />Aggregate Industries anticipates mining at the Platte Valley Operation site, including the <br />proposed amendment azea, will be complete in approximately 2 years. However, the rate of <br />mining and overall life of the mine is dependent on several factors including product demand. <br />The existing operation and amended area will continue to be mined in phases. Since <br />approximately 133 acres will eventually be mined on the site, mining in phases will limit the azea <br />of disturbance at any one time. The Platte Valley Operation will be mined in five phases, with <br />each of the phases being directly related to each of the five cells being mined (see the Pre- <br />Mining/Mining Plan Map, Exhibit C). The following table is the approximate acreage for <br />mining each phase. Mining in Cells 1 and 2 is almost complete and the majority of future <br />mining will occur in Cells 3, 4, and 5. <br />Minin Cell Area acres <br />1 30 <br />2 40 <br />3 12 <br />4 32 <br />5 19 <br />Total 133 <br />Mining in Cell 1 is generally complete and portions of the cell are currently being used as <br />sedimentation basins for fines produced by the on-site processing facility. It is anticipated that <br />process fines will be used to backfill the majority of Cell 1. The mining of Cell 2 is also neazly <br />complete. Cell 3 will be mined next, followed by Cell 4, and finally Cell 5 will be mined last. <br />As necessary, the existing concrete batch plant will be moved to access the aggregate deposit in <br />Ce115. Upon completion, portions of all the cells may also be used as sedimentation basins for <br />process fines produced on-site. <br />Minine Methods <br />The deposit will continue to be dry mined through the use of dewatering trenches and pumps. As <br />mining progresses, dewatering trenches will be constructed around the perimeter of each cell and <br />sloped to collect groundwater in selected areas of the pit. Pumps will be used at these locations <br />to remove the water that drains from the deposit and surrounding alluvium. If necessary, water <br />from the trenches will be circulated through a settling basin prior to it being discharged to the <br />South Platte River. <br />When the alluvium is sufficiently dewatered, the aggregate material will be recovered using <br />equipment and facilities typical for sand and gravel mining operations. The equipment and <br />facilities may include, but are not limited to the following: <br />Platte Palley Operalian <br />DMG 172 Perini[ Amettdmen[ <br />Page 5 <br />