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1 <br />4-11 <br />' Based on local and regional geology, it is anticipated that an underlying geologic formation <br />exhibiting adequate permeability properties can be located within the 2,000- to 6,000-foot depth <br />interval. This depth interval will also ensure that the mine water is igjected below regional <br />' mining activities. Depending on the formation penetrated, it is estimated that the formation <br />water emplacement capabilities would be between 20 to 80 gallons per minute per well. <br />' Utilizing an assumed average water emplacement value (permeability) for the underlying <br />geologic formation o[ 50 gallons per minute per well, approximately three deep wells would <br />' have to be installed for salt elimination (no discharge) and one deep well would have to be <br />installed for salt minimization (partial discharge) for the two current discharges. Six deep <br />' wells would have to be installed for salt elimination and three deep wells for salt minimization <br />for all three discharges. These wells would be approximately 6 to 8 inches in diameter, <br />' equipped with high-pressure injection pumps, and located throughout the site. The combina- <br />tion well and formation would be subjected to mechanical integrity testing upon installation <br />of the well to ensure applicable stability criteria are achieved. <br />The major work activities associated with this management alternative include the following: <br />• Construction equalization surface impoundments. <br />' Installation of 2,000- to b,000-foot 6 to 8-inch diameter deep <br />walla across the facility. <br />' Installation ofhigh-pressure injection systems. <br />• Installation of support piping and pumping systems. <br />• Preparation of permit application materials for UI. <br />' 4.4.5.2 Effectiveness <br />' The technical basis and approach for this alternative have been fully documented as a method <br />for managing various qualities of wastewater. The effectiveness of UI for management of the <br />' salt discharges is 100 percent assuming that an amenable underlying geologic formation can <br />be penetrated and appropriate permits secured. <br />4.4.5.3 Implementability <br />' This alternative would be implemented at the facility upon completion of the well drilling and <br />permitting. Based on the UI system requirements, operations at the facility should not be <br />