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<br />• <br />Mine water inflow records in Rienau No. 2 Mine <br />began in December, 1980. At that time, mine water <br />which had accumulated in the tunnels behind the <br />mining machine was pumped back to what is called <br />the lower sump. This lower sump is in a new section <br />of the mine. The water pumped into it has <br />accumulated and has not been moved elsewhere in the <br />mine. The pumping rate is not continuous; when <br />enough water has accumulated, the pump is started <br />and the area is pumped dry. The pumping record is <br />shown in Table G. Between December 2, 1980 and <br />February 16, 1981 (61 days) 71,300 gallons were <br />pumped from the working area to the lower sump. <br />During that time, the mine advanced an average of <br />426 feet in four entries, 8 feet high and 18 feet <br />wide (Northern Coal Company). The sources of water <br />to the pump are the inflow through the sides and <br />working face of the mine, and imported water <br />sprayed on the working mine face for dust <br />suppression. Assuming the imported water for dust <br />suppression is a minor component of the water <br />pumped back from the working mine area (to maximize <br />the inflow rate), then the average hydraulic <br />conductivity of the G coal seam is calculated: <br />R = tx 1,300 + al/6 t da tx t = 0.038 gal/day/ft2 <br />~J <br />This value is <br />conductivities <br />aquifer tests <br />Section G-S.0) <br />mine inflow r~ <br />the previous <br />occurs in the <br />less than the average hydraulic <br />of 0.11 gal/day/ft2 seen in the 1979 <br />on observation wells (Appendix B of <br />As mentioned in connection with <br />tes observed for Northern No. 1 in <br />paragraph, inflow to Rienau No. 2 <br />first 200 feet from the working mine <br />fC1 Leonard Rice Consulting Water Engineers, krc. <br />