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,.-- :. <br />' 4-10 <br />4.4.4.2 Effectiveness <br />The technical basis and approach Cor this alternative have been documented and could be <br />implemented at the facility if sufficient area eaiats for construction of the surface impound- <br />' meats. The effectiveness of this management alternative ie approximately 100 percent under <br />normal weather conditions. <br />4.4.4.3 Implementability <br />' This alternative would be implemented at the facility if sufficient area exists for construction <br />of the evaporative surface impoundment(e). Based on the surface area requirements for the <br />' anticipated flow rates, construction of the impoundments) and management of the construc- <br />tion spoil materials should not afTect facility operations to the degree that a nonasaisted <br />evaporation system would. <br />4.4.4.4 Costa <br />' The budgetary costs to implement this alternative for the complete removal (100 percent <br />evaporation) is estimated to be $5,800,000 Cor the two current discharges and $11,800,000 for <br />all three discharges. These coats are based on evaporation of 140 gallons per minute and 290 <br />gallons per minute for the two current discharges and all three discharges, respectively, and <br />' minor surface impoundments) construction limitations. The budgetary costa to implement this <br />alternative for partial removal of TDS in order to achieve compliance with the 2,000 pounds <br />' per day and 350 tons per year salinity limitations are estimated to be $1,700,000 for the two <br />current discharges and $4,700,000 for all these discharges. These costs are based on evapora- <br />tion and treatment of approximately 35 gallons per minute and 110 gallons per minute for the <br />two current discharges and all three discharges respectively, and similar construction limits- <br />, tiona. <br />4.4.5 MA6 - On-Site Management Utilizin¢ UI <br />' 4.4.5.1 Description of Management Alternative <br />Mine waters would be collected and equalized prior to discharge. After equalization and <br />' particulate settling, the TDS containing mine waters will be routed to one of several pumping <br />stations for injection into an underlying groundwater aquifer. It is anticipated that pretreat- <br />' went of the discharge would not be required prior to injection. <br />1 <br />