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included all active and inactive underground mine workings. The Annual <br />Hydrology Reports through 1989 present t:he mapping results of each point <br />:source inflow (faults, fractured roof, fractured floor, exploration drill ~' <br />hole, etc.) and each area wide inflow (drainage from seals to abandoned <br />mine workings; areas of weeping coal faces, roof, or floors; unsealed <br />rtiined areas, etc.) that were encountered during the survey. A total of <br />1.20 gpm inflow was estimated. Of that amount, approximately 108 gpm were <br />being generated from mined out areas totalling approximately 2,800 acres. <br />water inflow surveys were suspended after the mine was sealed in 1989. <br />No water was discharged until 1994 when the thickener recycling program <br />commenced. <br />Water quality of the inflow was also measured during the survey. <br />The Annual Hydrology Reports present the temperature, conductivity and <br />pH of each source. The quality of those sources seeping from gob or <br />abandoned mine areas was higher in temperature and conductivity than <br />those areas of current workings. Quality ranged from 1,830 to 3,540 <br />umhos conductivity, 15.6 to 18.3°C temperature and 6.7 to 8.0 S.U. pH. <br />The quality of active areas ranged from 762 to 1045 umhos conductivity, <br />9.9 to 15.3°C temperature and 6.9 to 8.0 S.U. pH. <br />Mine water inflow was collected in a sump and discharged from the <br />mine by pumping. The quality of the discharge water is controlled by <br />NPDES standards which limit potential impact to the hydrologic balance. <br /> <br />n <br />U <br />(Revised 2/6/95) <br />2.05-87 <br />