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9 <br /> <br />2.2.1.5 Mine Water Balance Table 2-2 shows the water balance for the Deserado Mine. <br />No water was pumped from underground workings between January 1996 and May of <br />2012. Pumping of excess mine water to the surface recommenced in May 2012. <br /> <br />During the 1996-1997 period, Deserado Mine started disposing the prep plant thickener <br />water in the mined out area of the D-Seam (the first longwall district). This water would <br />have been otherwise discharged through Pond PP-2. <br /> <br />Ingoing Water The production equipment utilizes water for dust control and cuttings <br />removal in roof bolting. Water used by equipment is based on 333 shifts worked by <br />continuous miner sections and 366 shifts worked by the longwall. The continuous miner <br />sections use 100 gpm and operate about 4 hours per shift (the rest of the time is spent <br />moving, etc.). The longwall equipment uses 200 gpm of water for about 8 hours per shift. <br /> <br />The amount of water entering the mine as ventilation intake air humidity is based on <br />monthly mean temperatures from Table II.C-1 on page II.C-5 of the Mining Permit and the <br />yearly mean relative humidity of 56% found on page II.E-1 of the Mining Permit. The <br />absolute humidity, the actual amount of water in the air, is calculated from these data <br />using an average ventilation quantity of 398,010 cubic feet per minute. <br /> <br />TABLE 2-2 <br /> MINE WATER BALANCE <br />WATER IN GALLONS/YR GALLONS/MIN <br />Production Equipment 43,128,000 82.05 <br />Ventilation Humidity 8,468,149 16.11 <br />Underground Storage of Thickener Water 2,760,000 5.25 <br />Incidental (pipe leaks, road watering, wash down) 4,312,800 8.21 <br />TOTAL 58,668,949 111.62 <br />WATER OUT <br />Coal Surface Moisture 21,930,137 41.72 <br />Ventilation Humidity 17,661,030 33.60 <br />Pumped Out – B-Seam 18,656,488 35.50 <br />Pumped Out – D-Seam 0 0 <br />TOTAL 58,247,655 110.82 <br />Net Water Left Underground 421,295 0.80 <br />Water pumped from B seam to D seam 0 0 <br />