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Mayo and Associates, LC <br /> <br />i <br /> <br />1 <br />1 <br /> <br />3.7.2.2 B East Mains Fault (BEM Fault) <br />In early Mazch 1996, the B East Mains Fault (BEM Fault) was crossed in the B East <br />Mains during development work (Figure 13). Groundwater discharge, much of which <br />was from the mine roof, was about 500 gpm. In early April 1996, the BEM Fault was <br />encountered B East Mains. Groundwater discharge increased to an estimated 2,500 gpm <br />(Figure 14). Fault water discharging from the mine floor was in the low geothermal <br />temperature range (84°F), evolved gas, and had a milky color. No precipitate was <br />deposited from the water. By eazly May the discharge declined to about 250 gpm and by <br />July dischazge had declined to about 85 gpm. Because the dischazge rate declined rapidly <br />a$er the 2,500 gpm peak, a comprehensive follow-up investigation was not performed. <br />~ooo <br />zsoo <br />zom <br />E <br />n <br />a <br />w 7500 <br />`m <br />N_ <br />[) <br />te~ <br />/}B,~E.M <br />Soo I • ~ <br />u nc xc n-zz <br />0 <br />18-Mar 23Mar 30-Mar 6-Apr 1}APr 26Apr 27-Apr 4May it-May 1&MaY 2SMaY 1-Jun &JUn tSJUn 22-Jun <br />Figure ] 4 Hydrograph of 1996 B East Mains (BEM) fault discharge from the B <br />East Mains and 24 HG XC 17-21, West Elk Mine. <br />Eva]uationofPotentia]GroundwaterInflows 53 Febmary24,2004 <br />Associated with E Seam Mining, <br />West Elk Mine, Somerset, Colorado <br />