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mine in early 2009. Note that there have been some changes in flow patterns since this study. Another mine <br />water balance may be performed in 2015, which would require expenditures for flow meters at key locations. <br />4.0 SUBSIDENCE IMPACTS <br />Fish Creek: Historically, hydrologic monitoring of potential subsidence impacts from the earlier 17 and 18 - <br />Right Panels utilizes four alluvial wells and four nearby surface sites. These sites are shown on the attached First <br />Half 2008 Subsidence Map. These include alluvial well AVF-14 and associated surface site SW -14 (upstream of <br />17 -Right subsidence zone). Also utilized are alluvial well 008-AU3 and associated surface Site 305 (downstream <br />of 17 -Right subsidence zone). Note that sites 305 and 008-AU3, were designated under TR03-42 as downstream <br />subsidence monitoring sites. <br />Alluvial well AVF-15 and associated surface site SW -15 are located between the two sets of upstream and <br />downstream sites, presently within a ponded subsidence zone. Localized ponding occurred in this area in <br />September/early-October of 2004. The creek bed flow path subsequently reestablished itself. <br />A portion of Fish Creek was last subsided in 2006. In that year, a short segment of Fish Creek crossed <br />approximately 160 feet into the zone of anticipated subsidence (based on the subsidence limit line) along the <br />extreme eastern edge of the 19 -Right Longwall Panel. Minimal subsidence impacts were noted along roughly <br />500 linear feet of Fish Creek, in this area. Note that during 2007, no significant ponding effects were observed in <br />this area, with the exception of site AVF-15, which appears to be in a permanently ponded area. Hydrologic <br />monitoring in 2015 did not indicate significant water quality impacts to Fish Creek. Note that seasonal <br />fluctuations in the concentrations of some analytical parameters (e.g. iron, conductivity, TDS, etc.) do occur at <br />the surface sites. Increases in iron concentration are often related to accumulation and leaching of iron -bearing <br />strata/sediments during spring runoff. Some elevated iron concentrations may also be related to ponding effects <br />(e.g. increased solids in ponded samples) <br />Subsidence did occur from mining on the new Western Mining District, such as along County Road 79. The <br />country road was repaired by in 2015. Note that Fish Creek was not subsided in 2015. <br />Foidel Creek: was historically undermined and subsided by TC's mining of the 9 Rt, 8 Rt, 7 Rt, and to a very <br />limited extent, the 6 Rt panel, and extreme eastern end of panel 12 Rt. Mining in 12 Rt was completed in 2001, <br />and subsequently sealed in September 2001. No significant changes to the creek channel were noted in 2015. <br />Middle Creek: was historically undermined and subsided by TC's mining of the 2 through 6 RT. No ponds <br />were formed over the mined out panels. Mining in 6 RT was completed in 2000. No significant changes to the <br />creek channel were noted in 2015. <br />5.0 SUMMARY AND CONCLUSIONS <br />No significant hydrology impacts, attributable to activities at the Foidel Creek Mine, were noted during 2015. <br />See discussion below, summarizing data assessments. <br />17 <br />