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1.0 PHASE I BOND RELEASE <br /> This application for Phase I bond release of applicable Trapper Mine lands is submitted in accordance with <br /> the Colorado Division of Reclamation, Mining and Safety (DRMS) Rule 3.03 (Release of Performance <br /> Bonds) and Guideline Regarding Selected Coal Mine Bond Release Issues of April 18, 1995. With this <br /> submittal, Trapper is proposing to release 298.3 acres of land, reclaimed from 2017 through 2019, from <br /> Phase I bond liability as outlined on Map 1.0. This includes Range Sites A and B rangelands in F, L and Z <br /> Pits. Specific parcels include F-B-19, L-AB-18, L-AB-19 and Z-A-17. These lands that have been regraded <br /> with drainages reestablished in accordance with Trapper's approved permit document (C-1981-010). <br /> 1.1 Post-mining Topography Demonstration <br /> Map 1.0 provides as-built post-mining topography contours for all Trapper Mine lands regraded through <br /> 2019. The map was constructed from aerial photogrammetry data collected in October 2016 and as built <br /> topography derived from EBee Plus'M Unmanned Aerial Vehicle (UAV or drone) aerial mapping. <br /> Representative cross sections comparing as-built topography with approved topography would be the same <br /> as those given in Permit Document C-1981-010; therefore, no cross sections are included in this <br /> application. <br /> 1.2 Drainage Reestablishment Documentation <br /> As explained in Section 1.1 for topographic cross-sections, drainage profiles comparing as-built and <br /> approved drainage profiles will likewise be the same as those given in C-1981-010. All reestablished <br /> drainages are delineated on Map 1.0. <br /> Trapper Mine has spared no effort and expense in constructing reestablished drainages that effectively <br /> control erosion and downstream sediment deposition. A variety of sediment control materials and methods <br /> and sediment reducing measures have been implemented on reestablished drainages. <br /> Rock check structures are used to dissipate the energy of flowing water within drainage channels. Debris <br /> and sediment tend to be deposited and trapped upstream of structures. This in turn permits establishment <br /> of vegetation behind structures which further stabilizes the channels. In addition, core trenches are installed <br /> in rock check structures, thus providing additional structural support and reducing the potential of <br /> downstream headcutting to move upstream. Subsequent establishment of permanent vegetation in <br /> reconstructed drainages insures future channel stability. <br /> This combination of appropriate conservation measures coupled with an effective drainage repair program <br /> insures successful establishment of reconstructed drainage channels at Trapper Mine. <br /> 1 <br />