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Mayo and Associates, LC <br />I • <br />I <br />~~ <br /> <br /> <br />~~ <br />~~ <br /> <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 Lnratinn ¢nm <br />Mioe Floor <br />max <br />flow <br />rate duration <br />eom <br />Fault Damage <br />Zone <br />max <br />flow <br />rate duration <br />¢nm <br />Soldier Creek Book Cliffs 10 da low ~ weeks 640 <br />Deer Creek Wasatch Plateau 80 1 eaz 300 1 ear 5,000 1 ear <br /> <br />Crandall Can n <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 S0 months low weeks 6,500 ears <br />Bowie Somerset ]ow <br />Sanborn Creek Mine Somerset low <br />Elk Creek Mine Somerset low <br />West Elk Mine Somerset 20 da s 8,000 I 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 discharge locations and most initial inflow rates aze substantially less than the <br />maximtnn. 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 discharges 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 />)n 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 />Evaluation of Potential Groundwater Inflows <br />Associated with E Seam Mining, <br />West Elk Mine, Somerset, Colorado <br />6 <br />February 24, 2004 <br />