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Juno 2000 3 <br />Energy Fuels Coal, Inc. 1999 Annual Hydrology Report <br />Water Balance Water Use, and Consumpfive Use <br />Water consumptively used by the Southfield Mine during the reporting period is estimated at <br />46.6 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 39.7 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 26.4 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 />26.4 ac -ft, as shown on to Table 3. This figure is more than double the amount for previous <br />reporting period due to severe precipitation events at the end of April 1999. <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 discharges were within NPDES permit limitations except during the 2nd <br />quarter. The permit limitations exceeded at outfalls 001, 002 and 004 all occurred when the <br />mine received 7.6 inches of rain in 2 1/2 days at the end of April. These violations of permit <br />limitations were submitted to the Department of Health as storm exemptions. All samples <br />submitted for Acute WET testing from Outfall 004 were in compliance. These data indicate <br />that Southfield's water treatment system effectively reduces the potential of significant impacts <br />to State waters. <br />