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7. Permanent Pile Configuration and Construction <br /> The Revenue Pile and the Atlas Pile have very specific design criteria regarding the area of the pile, <br /> slopes,benches,base perimeter,water handling ditches, etc. <br /> Rules: <br /> a- Prior to expanding the area of any of the two piles(including the any virgin ground areas), the <br /> perimeter of the base extent of the pile should be surveyed and clearly marked for the <br /> construction. <br /> b- Prior to stripping topsoil from the Atlas Pile, the collection ditches and Sediment Pond must be <br /> constructed according to the plans in Appendix D. Diversion ditches must also be installed at <br /> both piles to ensure that water from the mountain above the piles is diverted around the piles. <br /> These diversion ditches can be installed at the edge of where the tailings meets the hillside. The <br /> diversions can be moved upward as the pile grows in size and elevation. The diversion ditch <br /> plans are also included in Appendix D. <br /> c- All virgin areas should be grubbed of vegetation and then all topsoil must be salvaged to the <br /> extent practical. Topsoil thicknesses are expected to be approximately 6 inches in the upper <br /> areas of the Revenue Pile and possibly over 1 foot at the Atlas Pile. Topsoil can be direct placed <br /> on lower areas of the pile as they are completed or stockpiled. Visual color can be used to <br /> determine what is topsoil(darker material with less than 20%rock can be considered topsoil). <br /> Grubbed vegetation can be mulched and added to the topsoil placed back on the finished pile <br /> areas or disposed of in some other way. It cannot be placed in the embankment to be <br /> constructed. <br /> d- Prior to storing any tails or waste rock at the Atlas Pile, the base area should be compacted <br /> using the surface equipment. <br /> e- The design of both piles are based on installing horizontal lifts of no more than 12 inches, <br /> moving uphill to create a 3H:1V slope and every 30 feet vertically, a bench of 10 feet width is <br /> placed to slightly tilt to the inside edge, where water will collect and run away from the outside <br /> slope of the pile. The plans for these benches, slopes and ditches are shown in Appendix D. <br /> 5 <br />