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Following backfilling of the south portion of the BNER, dewaterin,g of the existing <br />;pond will `be accomplished °by ,pumping to the river. The weathered claystone <br />borrow material on the excavation floor will then be disking in ,preparation for <br />moisture conditioning. Geotechnical data from other,pits in the area indicate that <br />the weathered claystone is a suitable borrow material. The diner keyway <br />surrounding the perimeter of the excavation will then be .excavated to the <br />approximate dimensions shown in Exhibit �F, Sheet -2. Once the borrow material <br />is within the moisture specification ;(0 to +3% -of optimum moisture content), the <br />compacted clay liner will then ,be constructed by making passes with scrapers. <br />The scraper is expected to provide significant compaction energy to bring each <br />lift to 95% standard proctor maximum dry density. <br />Topsoil Replacement/ Revegetation <br />Topsoil will be replaced to an approximate depth of 1 ft for the areas shown in as <br />topsoil /revegetation areas in Exhibit F Sheet 1. An existing topsoil stockpile in <br />excess of 40,000 yd occurs just west of the south half of the BNER and will be <br />used for replacement. <br />Seeding and Fertilizing <br />The ,proposed seeding areas are shown on Exhibit F — Sheet -1. The <br />recommended seeding method is ,by drill and seeding rates assume this method. <br />The species composition of the seed mixture recommended for reclamation is <br />shown in Table E-3 below. <br />Table ,E -3. Recommended Seed Mixture <br />SPECIES ,(VARIETr <br />RATE — PURE <br />NATIVE/ <br />W/C <br />LIVE SEED (PLS) <br />INTRODUCE <br />SEASO <br />LBS /AC <br />D <br />N <br />Thickspike wheatgrass <br />8.0 to 10.0 <br />Native <br />Cool <br />(Critana) <br />Sideoats grama (Vaughn) <br />5.0 to 7.0 <br />Native <br />Warm <br />Switchgrass (Nebraska -28) <br />4.0 to 6.0 <br />Native <br />Warm <br />Alfalfa (Nomad) <br />3.0 to 5.0 <br />Introduced <br />NA <br />TOTAL <br />20.0 to 28.0 <br />Based on this seed mixture, an application rate of approximately 20.0 to 28.0'Ibs <br />�P,LS /ac will be used. Topsoil should'be disked.priorto seeding. It is <br />recommended that fertilizer'be utilized for reclamation. A standard application of <br />fertilizer will be used and applied at a rate of 250 Ibs /ac as shown in Table'E -4. <br />