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<br />' E.3.2 Waste Rock Disposal Areas <br />Waste rock disposal areas will be constructed at a <br />1.5H:1V slope. Each lift will include a 75-f; horizontal <br />' setback before beginning the next lift. The ne; or average <br />slope of the waste rock facilities, taking into account the <br />' design sideslopes and bench setbacks, is approxirt~ately 3H:IV. <br />Dump outslopes will be regraded upon completion. the outslopes <br />will be graded to eliminate all but a 15-ft wide (dozer width) <br />t of each bench. This area will allow for sediment collection <br />and erosion control. Where possible, the waste rock disposal <br />' areas will be reclaimed concurrent with waste rock placement. <br />As each lift is placed, the outslope along with the previous <br />bench may be reclaimed, as long as the seasonal conditions <br />permit reclamation. Topsoil will be applied to the dumps. The <br />' areas for topsoil placement will be prepared and seeded using <br />the basic procedures outlined in Section E.3. <br />' E.3.3 Heao Leach Facilities <br />1 E.3.3.1 Cyanide Neutralization <br />' Neutralization will begin with treatment of the <br />l <br />ti <br />h <br />id <br />i <br />h <br />d <br /> so <br />u <br />ons <br />e cyan <br />e <br />n t <br />e pon <br />leach pond solutions. T <br /> ~ will be neutralized by adding hydrogen peroxide. Once <br />' the water in the ponds has been treated with the <br /> oxidizing agent, the treated water will be used to rinse <br />' the leach pile. Sampling of outflows from the heap will <br /> occur once per week during the neutraliz.iticn phase. <br /> During the neutralization phase, the water will be <br /> applied using sprinklers. The sprinklers will allow for <br />' increased evaporation during reclamation. The cycle of <br />i <br />t <br />i <br />th <br />t <br />f <br />ll <br />d b <br />d <br />i <br />h <br /> ng <br />o r <br />nse <br />e <br />er <br />o <br />owe <br />y spray <br />oxi <br />iz <br />ng t <br />e wa <br /> leach pile will continue until the water draining from <br />' the leach pile reaches a pH between 6.0 and 9.0 and free <br /> cyanide concentrations of less than 0.2 part; per million <br /> <br />' <br />1 E-16 (Revised 4/20/89) <br />