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4-3 <br />4.3.1 MA1 -Off-Site Management at an Approved Treatment/Disposal Facility <br />4.3.1.1 Description of Management Alternative <br />Mine discharges would be collected and transported off site to an approved wastewater treat- <br />ment/dispoeal facility. The major work activities associated with this alternative include <br />constructing equalization/storage surface impoundments and installing tank truck loading <br />facilities. <br />' 4.3.1.2 Results of Preliminary Screenin <br />Although this alternative is easily implemented and effective, it is not practical. Based on the <br />t anticipated volume of mine water that would be managed by this alternative, the logistics and <br />cost for truck transportation would be prohibitive in addition to the cost that would be charged <br />' for treatment/disposal. Therefore, this management alternative was dropped from further <br />consideration. <br />1 <br />4.4 Evaluation of Remainine Alternatives <br />The remaining five management alternatives (MA2, MA3, MA4, MA5, and MA6) were also <br />evaluated for effectiveness and implementability. Since these alternatives passed the prelimi- <br />nary screening stage, they were further evaluated based on cost considerations. A description <br />of the five remaining alternatives and their associated evaluations is presented in the following <br />' sections. <br />4.4.1 MA2 - On-Site Treatment Utilizing RO and Direct Discharge <br />4.4.1.1 Description oCManagement Alternative <br />Mine discharges would be collected, equalized, and treated prior to discharge. ARer equalize- <br />' tion and particulate settling, the mine waters would be filtered to remove solids which may <br />impair operation of the treatment process end then routed to the treatment system. <br />' Based on the historical significant variations in mine water quality (flow and TDS concentra- <br />tion), a separate RO treatment unit would be installed for each of the three discharges. The <br />RO units would be centrally located to provide more efficient treatment process control. <br /> <br />1 <br />