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• Topsoil salvage within Soil Map Unit 810 will be restricted due to a high calcium <br /> carbonate content in the upper ten inches of the profile. Topsoil salvage within Soil Map <br /> Units 1EW and 808 may also be restricted due to shallow ground water conditions. The <br /> access, maneuverability, and efficiency of the salvage equipment would be severely <br /> restricted due to this condition. Additionally, irreversible structural damage would <br /> occur to these soils if they were salvaged while saturated. Therefore, topsoil salvage <br /> equipment will generally be limited to the drier areas of these map units. Appropriate <br /> adjustments will be made to the recovery rate as dictated by actual field conditions and <br /> initial topsoil balance reports. <br /> Topsoil Storage. When the direct haul of topsoil is not feasible, the topsoil will be <br /> stored in approved stockpiles (see Operations Plan - Nucla East, Exhibit 12-3). <br /> Stockpiling of topsoil will be required for topsoil removal in the initial box cut, haul <br /> road, spoil stockpile areas, sediment pond, office and shop area, dragline erection site, <br /> explosive storage area, and final pit/highwall reduction areas. Topsoil stockpiles will <br /> be located in areas where they will not be disturbed or contaminated by the ongoing mining <br /> operation and where the stored topsoil will not be lost to wind erosion or surface runoff. <br /> • When a topsoil stockpile is placed, it will not be moved until soil is needed for <br /> distribution on graded areas, or with CMLRD approval, are consolidated into other existing <br /> stockpiles. Stockpile locations were also evaluated and selected to minimize scraper <br /> travel distance, to reduce equipment cost, and to increase efficiency. <br /> Two classes of topsoil stockpiles, irrigated and dryland pasture/hayland types, will be <br /> established. Approved irrigated pasture/hayland topsoil stockpile locations will include <br /> two piles; one for first lift material (A and upper B horizons) and the other for second <br /> lift topsoil (lower B and C horizons). Approved dry pastureland topsoil stockpiles will <br /> only include one pile for mixed single lift soil (A, B, and C horizons). In certain <br /> non-prime farmland situations, mixed ABC topsoil will be stored with second lift topsoil <br /> and utilized as subsoil or single lift replaced topsoil. The prime farmland topsoil <br /> stockpiles will be limited to soil materials salvaged from map units D70B and 30C. All <br /> topsoil stockpiles will be clearly distinguished and identified by approved signs. <br /> Stockpile designations 1TS, 2TS, and MTS will be utilized for first lift, second lift, and <br /> mixed single lift topsoil materials, respectively. Mine personnel are instructed that <br /> topsoil stockpiles are not to be disturbed or contaminated. The signs serve as continuing <br /> • reminders to personnel that stockpile areas are to be preserved and undisturbed. <br /> 21-27 Revised 08/19/88 <br />