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Mayo and Associates, LC <br />'~ <br /> <br />1 <br /> <br /> <br />~. <br />Sandstone channels inflows will likely be minor, but persistent inflows associated with <br />faults such as the 14HG could be as great at 250-500 gpm. Similar inflow rates occurred <br />from sandstone channels in the Co-Op mine in the Wasatch Plateau. West Elk Mine <br />does not have a history of prolonged roof inflows, even though the Bowie Sandstone is <br />only located 50 feet above B Seam workings. Roof inflows of about 1,000 gpm in the <br />BEM azea of the B Seam were likely associated with the Bowie Sandstone; however the <br />inflows only lasted a few days. Most roof inflows into the E Seam should not persist too <br />long. <br />Fault related inflow from the underling Bowie Sandstone could be as great as those that <br />have been associated with the Rollins Sandstone in B Seam workings. However, the <br />relationship between the responses of the Bowie and Rollins Sandstones to fault damage <br />zones encounter during B Seam mining suggests that lazge and persistent inflows will not <br />occur. It is likely that most of the up gradient water in the Bowie Sandstone has been <br />previously dewatered during B Seam mining; however some perched water may remain <br />in the Bowie Sandstone. <br />potential groundwater inflows aze summarized in Table 2. <br />Although appreciable groundwater inflows aze not anticipated during E Seam mining <br />Potential groundwater inflow associated with the Mount Gunnison intrusion as well as <br />unexplored faults located near the intrusion aze less certain and should be evaluated more <br />Evaluation of Potential Groundwater Inflows <br />Associated with E Seam Mining, <br />West Ells Mine, Somerset, Colorado <br />February 24, 2004 <br />