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1 <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br />TABLE 2-3 <br />MINE WATER BALANCE <br />WATER IN GALLONS/YR GALLONSlMIN <br />Production Equipment 17,012,400 32.37 <br />Ventilation Humidity 9,574,300 18.22 <br />IJnderground Storage of Thickener Water (Feb-Sept '97) 27,000,000 51.37 <br />Incidental (pipe Peaks, road) watering, wash down 1,701,240 3.24 <br />,:._ <br />TOTAL . _ 55,287,940.=-. _ .. 105.20 - . <br />WATER OUT <br />(;oal Surface Moisture 7,019,000 13.35 <br />Ventilation Humidity 20,913,400 39.79 <br />Pumped Out_ 0 0 <br />TOTAL `_ _ - -- -_ .27,932.400.. 53.14 .:: . <br />-_ <br />.,. <br />e - _ <br />' ftlsolny Water The production equipment utilizes water for dust control and cuttings removal in <br />roof bolting. Water used by equipment is based on 818 shifts worked by continuous miner <br />sections and 89 shifts worked by the longwall. The continuous miner sections use 80 gpm and <br />' operate about 3 hours per shift (the rest of the time is spent moving, etc.). The longwall <br />equipment uses 140 gpm of water for about 7 hours per shift. <br />' The amount of water entering the mine as ventilation intake air humidity is based on monthly mean <br />temperatures from Figure II.C-2 on page II.C-9 of the Mining Permit and the yearly mean relative <br />' humidity of 569', found on page II.E-1 of the Mining Permit. The absolute humidity, the actual <br />amount of water in the air, is calculated from these data and an average ventilation quantity of <br />' 450,000 cubic feet per minute. <br />The amount of water entering the mine from the surrounding strata is partially estimated by <br />' identifying all known seep areas and estimating the flow rate from each. During January 1994, <br />a survey of the accessible areas of the mine workings was conducted to identify the location and <br />' flow rates of all seeps. The locations and flow rates of the seeps are shown on Plate 1. Due to <br />the very low flow rates measured, the flow rates are shown in gallons per day. Most, if not all, of <br />this water leaves the mine in the form of humidity in the ventilation air flow. There are very few <br />' locations in the mine that produce water over the long term. Most wet areas encountered during <br />LJ <br />12 <br /> <br />