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March 2001 3 <br /> Energy Fuels Coal, Inc. 2000 Annual Hydrology Report <br /> t <br /> Water Balance Water Use, and Consumptive Use <br /> Water consumptively used by the Southfield Mine during the reporting period is estimated at <br /> 45.9 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 40.3 ac-ft during the reporting <br /> period. The estimated total consumptive use during the corresponding period was 46.6 ac-ft. <br /> Water discharged to the stream system was approximately 2.9 ac-ft. This comparison of <br /> input, consumptive use, and discharged water quantities illustrates the water balance within <br /> the mine. <br /> NPDES Discharges to Streams <br /> Water discharged to the stream system during the period of this report totalled approximately <br /> 2.9 ac-ft, as shown on to Table 3. This amount of discharge is 25 to 30 percent of that of <br /> previous reporting periods due to the above mentioned lack of precipitation. <br /> Water discharges were treated and managed through Southfield's surface water handling <br /> system depicted on Figure 2. Discharges through NPDES outfalls were sampled and reported <br /> in accordance with the approved Colorado Wastewater 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 limitations. All samples submitted <br /> for Acute WET testing from Outfall 004 were in compliance. These data indicate that <br /> Southfield's water treatment system effectively reduces the potential of significant impacts to <br /> State waters. <br />