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Stream Channel Parameters and Changes <br /> Exhibit 55B Due to Longwall Mining-Induced Subsidence Page 5 <br /> Creek. Basin 41 is Lion Gulch, a tributary to Minnesota Creek. <br /> This report evaluates the extent of potential subsidence due to mining of the B-seam in longwall <br /> panels LWB26 through LWB29 within the Southern Panels mining area and the E-seam longwall <br /> panels LWE10 through LWE12 in the Apache Rocks West mining area. Finally, this report <br /> assesses potential subsidence over panels LWE14, and LWSS 1 through LWSS4 in the Sunset Trail <br /> mining area. All panel layouts evaluated in this exhibit are shown in Figure 1. <br /> As of December 2020, MCC had completed mining in E-seam longwall panels in LWE1 through <br /> LWE8. LWSS1 has been mostly mined. LWE14, LWSS2, LWSS3, and LWSS4 have not yet <br /> been mined. This exhibit assesses potential subsidence over portions of these unmined and <br /> partially mined panels, depending on the location of the study reach. <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 /> 831-032.921 Wright Water Engineers, Inc. <br /> December 2020 <br />