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<br />LJ <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />l~ <br />I <br />I , <br /> <br />i~ <br />TABLE 2-2 <br />MINE WATER BALANCE <br />WATER IN GALLONS/YR GALLONS/MIN <br />Production Equipment 27,400,320 52.13 <br />Ventilation Humidity 10,106,206 19.23 <br />Underground Storage of Thickener Water 10,700,000 20.36 <br />Incidental (pipe leaks, road) watering, wash down 2,740,032 5.21 <br />TOTAL 50,946,558 96.93 <br />WATER OUT <br />Coal Surface Moisture 25,201,753 47.95 <br />Ventilation Humidity 21,077,333 40.10 <br />Pumped Out 0 0 <br />TOTAL 46,279,087 88.05 <br />Water Left Underground 4,667,471 8.88 <br />Water pumped from B seam to D seam 4,204,800 8.00 <br />Inaoina Water The production equipment utilizes water for dust control and cuttings removal <br />in roof bolting. Water used by equipment is based on 579 shifts worked by continuous miner <br />sections and 208.4 shifts worked by the longwall. The continuous miner sections use 100 <br />gpm and operate about 4 hours per shift (the rest of the time is spent moving, etc.). The <br />longwall equipment uses 120 gpm of water for about 9 hours per shift. <br />The amount of water entering the mine as ventilation intake air humidity is based on monthly <br />mean temperatures from Figure II.C-2 on page II.C-9 of the Mining Permit and the yearly <br />mean relative humidity of 56% found on page II.E-1 of the Mining Permit. The absolute <br />humidity, the actual amount of water in the air, is calculated from these data and an average <br />ventilation quantity of 521,000 cubic feet per minute. <br />The smallest quantity of water entering the mine is the incidental category. This category <br />includes leakage from water lines, dust control watering in the haulage entries, and <br />washdown water used in the slope and other locations. It has been assumed that 10% of the <br />water used for production equipment will be used under this category. <br />8 <br />