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EFCI controls mine inflows by utilizing a series of sumps, high capacity <br />• submersible pumps, and water lines to transfer water from active workings to <br />abandoned mine areas. <br />The primary areas where significant underground mine inflows are currently <br />occurring are the 2-North mains and the abandoned 1-North section. EFCI has <br />also experienced large volume inflows in the south submain area. However. <br />inflows occurred over a limited period of time and have not been persistent. <br />Inflow sources for the above mine areas appear to be abandoned old workings <br />above and/or up-dip of the Southfield Mine, and other limited perched <br />aquifers. <br />The 1-North section has been utilized as an underground sump since 1984, <br />receiving pumped dewatering flows and local groundwater inflow, with <br />subsequent discharge to the surface via the North Dewatering Well. Water <br />discharged by the North Dewatering Well has reported to Clean Water Pond No. 3, <br />then into EFCI's surface water handling system described in Section 2.05.6. <br />As a result of water rights issues pertaining to consumptive use of water <br />• pumped from within the Southfield Mine, EFCI plans to eliminate the North <br />Dewatering Well by transferring all mine inflows to abandoned downgradient <br />workings in the west-end of the mine. <br />EFCI plans to eliminate use of the North Dewatering Well by curtailing pumped <br />inflows into the 1•North section and creating a hydraulic connection between <br />2-North mains and the lower end of 1-North. The planned connection will <br />involve either mining entries from 2•North into the currently sealed 1-North <br />section, or similarly mining entries to within approximately 50 feet of 1-North <br />and drilling a series of small diameter hales towards the sealed section. <br />These boreholes in the coal barrier between sections will effectively drain <br />any water accumulating in 1-North. <br />Water drained from 1-North into the 2-North mains, as described above, will <br />gravity flow towards the North and west filing abandoned workings. When the <br />water level rises into the active working areas of the 2-North mains. <br />existing high capacity pumps will discharge the excess water through water <br />• lines installed from 2-North into the Main Entries, then down into abandoned <br />areas of the West Mains section. <br />.~ ~ <br />C:1TM\6601VOL.1 \OP.PLN <br />10104/945:51pmWP51/cmc 2.05.3-12 Revised - 09/30/94 <br />