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' ' S ' Alternative Reclamation Plan <br />i~i <br />SI-lB AGRA Project E92-7075 <br />Page IO <br />any of the extremely aggressive introduced cool season grasses that so often overwhelm all other <br />components, even in seed mixes that seem to contain a large proportion of native species). In <br />the wetland areas, if some areas are too wet to support tractor and drill, the area will be <br />broadcast seeded, at rates twice those shown in Table E-2. <br />' Mulchine <br />The preferred means of providing the protective cover necessary to shelter germinating seeds <br />is use of a cover crop. Cover crop species and periods during which they may be profitably <br />' planted are listed in Table E-3. Use of cover crop is preferred because 1) it results in a stronger <br />vertical surface structure than other mulching methods, providing much superior protection from <br />' erosive and desiccating effects of wind, 2) it provides more organic matter and often better <br />surface cover than other forms of mulch, and 3) it reduces the possibility of introduction of <br />additional weed seed. These cover crops will be sown using a drill equipped with coulter wheels <br />' and furrow openers spaced between 10 and 16 inches. If the seedbed is not ready to plant <br />between April 1 and October 1, then use of a straw mulch will be undertaken. Two (2) tons of <br />t clean long-fiber straw will be spread and crimped into the soil surface prior to seeding. In areas <br />to be broadcast seeded, seeding will precede application of mulch which will be either <br />hydromulched with 1600 lbs. of thermally produced wood fiber mulch, or covered with 2 tons <br />of clean long-fiber straw. In either case, the applied mulch will be anchored with 100 Ibs/acre <br />of Psyllium-based tackifier. <br />Temporary Surface Stabilization <br />' Certain areas, such as overburden and topsoil stockpiles, roadcuts, or fills, will require <br />establishment of a vegetation cover to protect the surface from erosion until disposition of the <br />underlying material in final reclamation. Following completion of earthmoving, such temporary <br />t areas will be drill seeded with a cover crop as indicated in Table E-3, followed by drilling of <br />the seed mix indicated in Table E-4. If a cover crop cannot be used, the azea will be seeded <br />' with the mix indicated in Table E-4 and then mulched as indicated in Mulching above, either <br />with straw or hydraulically-applied wood fiber, and anchored with tackifier. On the Interim <br />Wasterock Storage Pile, topsoil will be placed at depths of 4 to 8 inches to support a vegetation <br />' cover capable of controlling erosion. As overburden is removed from this pile, soil will be <br />salvaged for replacement on the original surface beneath the pile and subsequent revegetation <br />to grassland. <br />L, A G R A <br />' Earth & Environmental Group <br />