2023-05-25_PERMIT FILE - M2022048 (15)

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MINING PLAN AND TIMETABLE EXHIBIT D(CONT) terial from the working face to the Plant . As mentioned above, the proposed mining sequence may change due to unforeseen circumstances such as market conditions, varia- tions in the natural deposit, agreement restrictions with struc- ture owners, etc. At this time, the plan is to mine them sequen- tially from 1 through 4 as shown on the maps . The following mining methods will apply to all of the reser- voir Phases . Operations will begin in each Phase of reservoir construction by stripping the area where mining will start . Ini- tially a 30 acre area will be stripped and periodically as min- ing progresses it will be extended so there is approximately 30 acres ready for mining at any-one-time as each Phase is mined. The topsoil needed for resoiling the above-water areas will be separated from the overburden and stored around the mining area for use in reclamation. Once enough topsoil is salvaged to resoil the above-water disturbed areas with an average of 10-12 inches, the rest may be sold. These stockpiles will be placed strategically as mining progresses . In some cases the stripped topsoil will be placed on areas where grading and shaping, are complete so it only has to be handled once. In Phases 1 and 2, all topsoil storage piles will be located as far from the river as practical, and will run parallel to the river' s flow if lo- cated in the floodplain. During the stripping, a slurry wall pad will be built around the reservoir mining area using the excess topsoil and overbur- den. When the slurry wall pad has been completed, the bentonite slurry wall construction will begin. This is done by excavating a trench in the pad that is keyed into the underlying bedrock and filled with a mix of overburden, bentonite and water to create the slurry that becomes the liner. The soil and overburden not used in slurry wall construction or sloping will be placed around the mined area or sold. After the slurry wall liner is in place within a phase, a dewatering trench will be excavated inside the perimeter of the slurry wall. A pump will be installed and dewatering will begin. This will allow the area within the slurry wall to be dry mined. The trench will be extended around the area as mining progresses . Some of the soil will be used to construct a sight berm along road areas in each Phase. These berms will limit visibil- ity into the active mining areas from the transportation corri- dors . The berms will vary in height depending on the area to be L.G. EVERIST, INC-WEST FARM RESERVOIRS May 2023 12