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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 (DBMS) 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 316.5 acres of land, reclaimed from 2008 through 2023, from <br /> Phase I bond liability as outlined on Map 1.0. This includes Range Sites A, B and C rangelands in D/E and <br /> I Pits. These lands that have been regraded with drainages reestablished in accordance with Trapper's <br /> approved permit document (C-1 981-010). <br /> Specific parcels include: <br /> D-AB-23, 284.9 acres <br /> E-AB-08, 1.2 acres <br /> E-AB-23, 9.0 acres <br /> I-C-23, 21.4 <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 /> 2023. The map is constructed from aerial photogrammetry data collected in October 2017 and as built <br /> topography derived from EBee PlusT" Unmanned Aerial Vehicle (UAV or drone) aerial mapping conducted <br /> monthly throughout 2023. Representative cross sections comparing as-built topography with approved <br /> topography would be the same as those given in Permit Document C-1981-010; therefore, no cross <br /> sections are included in this 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 /> 1 <br />