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4-? <br />' TDS. In addition, the IO treatment process can effectively manage variable influent concentra- <br />tion of the dissolved ions without affecting the overall performance. <br />' 4.4.2.3 Implementability <br />This alternative could be implemented at the facility with only minor delays for equipment <br />design and delivery. Based on treatment system size requirements for the anticipated flow <br />' rates and TDS loadings, construction and operation of the treatment system and associated <br />equipment should not affect facility operations. <br />1 <br />4.4.2.4 Coats <br />' The budgetary coat to implement this alternative for the complete removal (95 percent <br />effective) of TDS in the mine discharges is estimated to be $11,900,000 for the two current <br />' discharges and $21,600,000 for all three discharges. This cost is based on treatment of 140 <br />gallons per minute at a daily TDS loading of 2,600 pounds for the two current discharges and <br />' 290 gallons per minute at a daily loading of 6,200 pounds TDS for all three discharges. The <br />budgetary cost to implement thin alternative for partial removal of TDS in order to achieve <br />' compliance with the 2,000 pounds per day and 350 tons per year salinity limitations is <br />estimated to be $4,700,000 for the two current discharges and $13,100,000 for all three <br />' discharges. This cost is based on treatment of approximately 35 gallons per minute at a daily <br />TDS loading of 590 pounds for the two current discharges and 110 gallons per minute at a <br />' daily TDS loading of 3,200 pounds for all three discharges. <br />' 4.4.3 MA4 - On-Site Management Utilizine Natural Evaporation nth no Discharee <br />t 4.4.3.1 Description of Management Alternative <br />Mine waters would be collected and routed to an on-site evaporative surface impoundment. <br />Under this management alternative, waters entering the evaporative surface impoundment <br />would evaporate resulting in the concentrating of the dissolved ion species within the impound- <br />' went. <br />Based on the facility location, regional lake evaporation rates indicate that, under normal <br />weather conditions, approximately 40 inches of water will evaporate on a yearly basis. For the <br />two current discharges, the surface area of the impoundments) required to evaporate the <br />' anticipated flow of 140 gallons per minute (salt elimination) and 3b gallons per minute (salt <br /> <br />