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active chemical precipitation membrane separation water treatment facility, located along <br />the southern reclaimed portion of the West Pit as shown in Figure 1. The final backfilled <br />surfaces of the West Pit area have been topsoiled and vegetated, although the backfilled <br />areas subsequently re-disturbed as the result of the West Pit water treatment system will <br />require additional reclamation. <br />Waste Rock Facilities <br />Seven waste rock facilities (including the East and West Pits) were constructed during the <br />active mining operations as depicted on Figure 1. Waste rock facilities were constructed <br />in 50-foot benches by end-dumping waste rock from mine haul trucks. The benches or <br />lifts were constructed with angle of repose 1.SH:1 V slopes along the active benches . As <br />lift construction was completed on a lower lift, concurrent reclamation practices were <br />instituted reclaiming the lower lift as upper lift construction was initiated. As soon as <br />construction was completed on the lower lift, the lift was contoured (i.e., graded) to a <br />3H:1V slope configuration, topsoil was placed, and the reclaimed surface was vegetated. <br />As a result, all of the waste rock facilities had been either partially or fully reclaimed <br />prior to the finalization of the mining operations. Concurrent reclamation provided <br />immediate stormwater management benefits through minimizing exposure of waste rock <br />and providing vegetative stability. <br />Waste rock facility descriptions are listed below: <br />1. Waste Rock Facility A is located west of the West Pit and north of the Rito <br />Seco stream channel. This area was never used for waste rock disposal but <br />served as an area for topsoil stockpile storage during active mining operations. <br />Current and future use of the area will be as stormwater retention ponds for <br />post-reclamation mine operations north of the Rito Seco stream channel. Two <br />ponds have been constructed in the area to allow for the collection and <br />retention of stormwater from reclaimed waste rock facilities B, C, and the East <br />and West Pit backfills. <br />' 2. Waste Rock Facility B is located west of the West Pit and north of the Rito <br />Seco stream channel. Most of the waste rock placed at Waste Rock Facility B <br />was removed to facilitate final partial backfilling of the West Pit. The lower <br />' lift of the facility is all that currently remains. This lift was concurrently <br />contoured, topsoiled, and vegetated during facility construction in 1992. The <br />1 <br />Battle Mountain Resources, /nc. Te(esto Solutions, Inc. <br />' .aim;..,~o.,~»„~e.ma~asem=r,rmr.d« 4 May 3. 1002 <br />