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Mey 1999 3 <br />Enemy Fuels Coal, Inc. 1998 Annual Hydrology Repert <br />r Balance. W <br />Water consumptively used by the Southfield Mine during the reporting period is estimated at <br />41.6 ac -ft as shown on Table 2. Consumptive uses shown on Table 2 include pumping from <br />the Corley Well, domestic use, and pond evaporation. <br />Primary uses of water at the mine are coal preparation and underground dust suppression. <br />Historically, of the total water pumped for use at the mine, approximately 38 percent is <br />consumed in the coal preparation plant, and 27 percent is used for underground dust <br />suppression. The remainder of water use is attributed to pond evaporation and outside dust <br />suppression and equipment washing. <br />Water balance within the mine is a comparison of the consumptive use of the mine and the <br />estimated input and output water in the water handling system. Water pumped into the system <br />from the Corley Mine Well, shown on Table 2, totalled 35.1 ac -ft during the reporting <br />period. Approximately 1.6 ac -ft of this total was discharged into the mine when vandals broke <br />an underground water line in February. The estimated total consumptive use during the <br />corresponding period was 41.6 ac -ft. Water discharged to the stream system was <br />approximately 10.2 ac -ft. This comparison of input, consumptive use, and discharged water <br />quantities illustrates the water balance within the mine. <br />NPDES Discharges to Streams <br />Water discharged to the stream system during the period of this report totalled approximately <br />10.2 ac -ft, as shown on to Table 3. Water discharges were treated and managed through <br />Southfield's surface water handling system depicted on Figure 2. Discharges through NPDES <br />outfalls were sampled and reported in accordance with the approved Colorado Wastewater <br />Discharge permit. <br />Water quality data for discharges to streams are summarized on Table 3. A review of these <br />data indicate that all discharges were within NPDES permit limitation. In addition, all <br />samples submitted for Acute WET testing from Outfall 004 were in compliance. These data <br />indicate that Southfield's water treatment system effectively reduces the potential of <br />significant impacts to State waters. <br />