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{ ~ <br />CHAPTER 3.0 <br />IN-RIVER GRAVEL MINING <br />Mining in the mainstream of the South Platte River or any of its tributa- <br />ries is strongly discouraged. Without extensive measures to protect the <br />river, the impact of an instream sand gravel extraction can be widespread <br />and severe. All operators proposing to mine the mainstream of the river <br />shall demonstrate conclusively that they will not adversely impact the <br />river and the properties, roads, bridges, diversion structures and utili- <br />ties on the river for a distance of four miles in the upstream and down- <br />stream directions, in addition to taking the mitigating measures required <br />in Chapter 3.0 and obtaining all other permits required by Federal and <br />State law. <br />Znstream mining of the river includes not only mines which are ongoing in <br />the channel of the South Platte River or its tributaries, but also includes <br />offstream gravel mines when it is proposed to relocate the river through <br />such offstream gravel mines. The impacts of relocating a river or a stream <br />through an off channel pit is equivalent to those associated with the ac- <br />tual mining of the South Platte River bed or its tributaries. As such, <br />these requirements will apply to mines which actively mine within a river <br />or stream channel as well as mining operations which propose to relocate a <br />river or a stream through previously mined pits. <br />One form of instream mining will be allowed. Lowering of the channel in- <br />vert to the elevation specified in the Master Plan will be allowed if the <br />operation is stopped as soon as District determines the desired degradation <br />has occurred and the associated bank and channel improvements are also con- <br />structed. <br />UDLFCD GRAVEL GUIDELINES 12/17/87 <br />3-1 <br />