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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 />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 />Ingoinq Water The production equipment utilizes water for dust control and cuttings <br />removal in roof bolting. Water used by equipment is based on 314 shifts worked by <br />continuous miner sections and 327 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 />The amount of water entering the mine as ventilation intake air humidity is based on <br />monthly mean temperatures from Table II.0-1 on page II.0-5 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 421,308 cubic feet per minute. <br />TABLE 2-2 <br />MINE WATER BALANCE <br />WATER IN <br />GALLONSNR <br />GALLONS/MIN <br />Production Equipment <br />47,328,000 <br />90.05 <br />Ventilation Humidity <br />9,154,505 <br />17.42 <br />Underground Storage of Thickener Water <br />2,160,000 <br />4.11 <br />Incidental (pipe leaks, road watering, wash down) <br />4,732,800 <br />9.00 <br />TOTAL <br />63,375,305 <br />120.58 <br />WATER OUT <br />Coal Surface Moisture <br />24,678,726 <br />46.95 <br />Ventilation Humidity <br />19,092,483 <br />36.33 <br />Pumped Out — B -Seam <br />14,449,464 <br />27.49 <br />Pumped Out — D -Seam <br />21,306,225 <br />40.54 <br />TOTAL <br />79,526,898 <br />151.31 <br />Water Removed From Underground <br />16,151,593 <br />30.73 <br />Water pumped from B seam to D seam <br />0 <br />0 <br />