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Mayo and Associates, LC <br />Table 1 Maximum groundwater inflow rates and durations for underground coal <br />mines -Utah and Colorado. <br />SS Channel <br />max <br />flow <br />rate duration <br />Mine Location zom <br />Mioe Floor <br />max <br />flow <br />rate duration <br />¢pm <br />Fault Damage <br />Zone <br />flow <br />rate duration <br />zom <br />Soldier Creek Book Cliffs 10 da s low ~ weeks 640 <br />Deer Creek Wasatch Plateau 80 I eaz 300 1 ear 5,000 1 eaz <br /> <br />Crandall Can on <br />Wasatch Plateau <br />50 <br />1 month <br />300 4 <br />months <br />Co- Wasatch Plateau 250 1 eaz <br />S line Mine Wasatch Plateau ~ 50 months low weeks 6,500 ears <br />Bowie Somerset low <br />Sanborn Creek Mine Somerset low <br />Elk Creek Mine Somerset low <br />West Elk Mine Somerset 20 days 8,000 1 month <br />The listed maximum flow rate is for a single event and duration is the anticipated <br />maximum term of the inflow. Most sandstone channels and fault interceptions have <br />numerous dischazge locations and most initial inflow rates are substantially less than the <br />maximum. Except for Skyline Mine, fault damage zone inflows flow rates declined <br />rapidly after initial interception. At Skyline Mine the 6,500 gpm inflow decreased, but <br />numerous dischazges of about 1,000 gpm continued for several yeazs. In the table the <br />duration is the typical time required for the discharge to cease flowing. <br />In West Elk Mine fault and non-fault related groundwater inflows into E Seam workings <br />may occur from two potential sources: <br />1. overlying sandstone channels, and <br />2. fault damage zones which intercept the underlying Bowie Sandstone. <br />Evaluafion of Potential Groundwater Inflows 6 February 24, 2004 <br />Associated with E Seam Mining, <br />West Elk Mine, Somerset, Colorado <br />