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Postmining Vegetation Types. As noted in the above section, a portion of the reclaimed <br /> area will be returned as dryland pasture. This area will receive thicker 15 inch topsoil <br /> replacement depths and will be seeded with Seed Mix #1 - Dryland Pasture/Rangeland Mix. <br /> The remaining areas will have 10 inch topsoil replacement depths and are generally <br /> adjacent to the old mine disturbance areas or native rangeland areas (see Tab 21 "Minesoil <br /> Reconstruction"). These areas, also seeded with Seed Mix #1, are to be reclaimed as <br /> rangeland and have no potential for irrigation. Drainage and riparian vegetation types <br /> will be established in sediment pond reclamation areas and any affected areas of the large <br /> drainages traversing the permit area. Seed Mix #2 - Reclaimed Drainage/Mesic Site Mix <br /> will be used in these areas. Enhancement of habitat will be carried out by selective <br /> plantings of species from Shrub and Tree Planting Lists #1 (Dry Sites) and #2 (Moist <br /> Sites). Refer to Exhibit 22-1 "Postmine Vegetation Map - Nucla Mine" for the location of <br /> the various types on the postmining landscape. <br /> Seedbed Preparation. Topsoil maintenance and replacement is discussed in Tab 21 "Minesoil <br /> Reconstruction". Upon completion of topsoil replacement necessary seedbed preparation <br /> prior to seeding will be carried out. Compacted areas will be deep ripped as necessary <br /> • prior to topsoil replacement. Seedbed preparation will include chisel plowing or disking <br /> to reduce compaction of replaced topsoil , break up clods and control weeds. Disking will <br /> be the preferred seedbed preparation method used prior to the seeding operation. Tillage <br /> or seedbed preparation operations will be kept to the minimum required to achieve the <br /> desired results. <br /> Seed Mixes and Planting Lists. The following seed mixes and shrub and tree planting lists <br /> are to be used in the various revegetation activities at the Nucla Mine as described in <br /> Postmine Vegetation Types. <br /> Seed Mix #1 - Dryland Pasture/Rangeland Mix. <br /> Species <br /> Drilled <br /> Rate lbs. <br /> Scientific Name Common Name PLS/acre* Seeds/ft2 <br /> 1. Agropyron dasystachyum Thickspike wheatgrass 3.00 10.5 <br /> • 2. Agropyron desertorum1 Desert wheatgrass 1 .00 4.5 <br /> 3. Agropyron smithii Western wheatgrass 2.00 5.2 <br /> 22-2 Revised 04/11/88 <br />