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Mayo and Associates, LC <br />~~ <br />Historically groundwater enters the mine through two pathways (Mayo and Associates, <br />1998, 1999b; Mayo and Koontz, 2000; Harris et al., 2002): <br />1. roof inflows from sandstone channels in the Upper Coal Member of the <br />Mesaverde Group, and <br />2. fault-related damage zones associated with tectonic faults having limited <br />horizontal displacement. <br />'~ <br />~~ <br />~] <br />3.7.1 Sandstone Channels <br />Groundwater inflows in the F Seam working were lazgely limited to roof drips that dried <br />up relatively quickly. Because the inflows were insignificant no records of inflow were <br />made. <br />3.7.2 Fault-Related Inflows <br />Since initiation of B Seam mining in 1990, fault related groundwater inflows from the <br />mine floor have been encountered numerous times. This water issued from the Rollins <br />Sandstone (Figure 3). Initial inflows have been as great as 8,000 gpm and have <br />significantly effected mining operations. Fault-related groundwater inflows are described <br />in detail by Associates (1998, 1999b, 2004) and Mayo and Koontz (2000). Summarized <br />below aze the most significant groundwater inflows. <br />Evaluation of Potential Groundwater Inflows <br />Associated with E Seam Mining, <br />West Ells Mine, Somerset, Colorado <br />51 <br />Febncary 24, 2004 <br />