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Stream Channel Parameters <br />Exhibit 558 and Changes Due to Mining -Induced Subsidence Page 2 <br />longwall panel LWE7, and had completed development mining of longwall panel LWE8. <br />Development mining of longwall panel LWE9 entries is not planned until after the coal reserves <br />to the south have been mined -out. This report evaluates the extent of potential subsidence due to <br />mining of the B -seam in longwall panels LWB26 through LWB29 within the Southern Panels <br />mining area. This update also assesses subsidence at the proposed E -seam longwall panels LWE10 <br />through LWE12 in the Apache Rocks mining area. Finally, this report assesses potential <br />subsidence over panels SSI through SS4 in the Sunset Trail mining area. All panel layouts <br />evaluated in this exhibit are shown in Figure 1. <br />Table 1 identifies streams that may be impacted by the proposed mining. The mining area <br />encompasses portions of 20 separate minor tributaries of the Dry Fork, Lick Creek, South Prong <br />and Deep Creek in the study area. Table 1 lists the basins and whether or not they are potentially <br />impacted by proposed mining. This study focuses on a detailed evaluation of the potential <br />subsidence impacts to 7 representative basins overlying the existing and/or proposed longwall <br />mining. A detailed discussion of the mine plan and projected subsidence for these areas is given <br />in Exhibit 60E. <br />The first portion of this hydraulic and hydrologic evaluation establishes pre -mining, or baseline, <br />conditions. The second portion of this evaluation describes the potential and likely impacts of <br />mining operations on the surface drainage system and channel characteristics. <br />831-032.816 Wright Water Engineers, Inc. <br />October 2018 <br />