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the size of the pile, and the issues presented by the topography south of the Atlas waste piles, the <br />diversion and collection structures for this pile will be built in stages. This will allow the <br />construction of a diversion ditch in easier to excavate material and on a gentler slope, saving on <br />initial cost. Prior to expanding the Atlas waste pile to full build -out, the new diversion and <br />collection structures will have to be constructed. These two sets of structures can be seen on <br />Maps C -3 and C -4 for the respective stages. The maximum height of the Atlas waste pile will be <br />90 feet, and therefore a 10 feet wide bench will be placed approximately 50 feet from the toe of <br />the pile. <br />Both waste pile areas will be stripped of any usable topsoil material prior to disturbance. No <br />topsoil is expected to be encountered in the Revenue waste pile area, but some may be present on <br />the Atlas waste pile area. Topsoil stripped from either area will be placed in the footprint of the <br />other waste pile for storage. Additionally, over the course of the construction of the Revenue <br />waste pile, topsoil will be imported for its reclamation. This topsoil will be stored on the Atlas <br />waste pile area once the wetland issue is addressed and either wetlands will be avoided or they <br />will be subject to an approved COE permit. If necessary, this topsoil will be stored in the <br />Revenue Pile area. Once the Revenue pile is finished, and successfully capped, topsoil for use <br />reclaiming the Atlas waste pile will be stored on top of the Revenue waste pile. <br />Waste Embankment BMP's <br />1) In the SPLP test, the ore is ground to a minute size (i.e., smaller than 9.5 millimeters) prior to <br />leaching with a pH 5 solution, while the actual waste rock embankment site will have larger <br />sized rocks up to 1.5 inches in diameter, that will not leach as readily. <br />2) Undisturbed runoff from the south hillside will be permanently diverted away from the waste <br />rock embankment, utilizing diversion ditches designed for the 100 -year, 24 -hour storm event. <br />3) The waste rock embankment will be covered with a minimum of twelve inches of topsoil and <br />planted with a stable mix of grasses and forbs well suited to this location. The vegetation will <br />utilize most of the direct precipitation and surface water runoff that occurs on the reclaimed <br />Revenue Mine August 2012 D -15 <br />