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perpendicular to the slope of the hillside. This placement will serve to • minimize the erosion potential of these soils. Rotocleared soils have a large amount of viable, native plant materials capable of revegetating an area without seeding. Therefore, of the rotocleared topsoils replaced within any given year, approximately 50 percent will not be seeded and approximately 50 percent will be seeded with the permanent rangeland seed mixture at a rate of about 10 P.L.S. per square foot. This procedure will be followed until site specific results at the mine determine that either all replaced, livehandled Rotocleared soils require seeding or that seeding is optional. The plant material incorporated into these soils by the Rotoclear also acts as a suitable mulch. Therefore, no additional mulching will be required on these areas (see 9.3). Operationally, the principal management guideline that will be adhered to in order to realize the greatest revegetation success from the livehandled Rotocleared soils is to limit equipment disturbance within the shortest time frame possible. After soil is replaced in areas that will not be seeded, and at the discretion of PSM personnel, the "seedbed" may be firmed through use of an imprinter or other suitable non-tilling implement. When seeded, surface roughening will be undertaken on these areas as described under Contour Furrowing and Land Imprinting below. If the • revegetation monitoring program (see 4.9.9) shows inadequate plant establishment, interseeding or transplanting may be undertaken. Stockpiled Rotocleared Topsoil Rotocleared soils that have been stockpiled will be seeded after they have been replaced on lands that have been final graded. Rotocleared plant materials incorporated into the soil during salvage operations will serve adequately as mulch, so additional mulching will not be required. The permanent rangeland seed mixture will be planted using one of two basic operational procedures. The main difference in the two operational procedures is the type of surface roughening that is employed. Surface roughening can be established using either a contour furrower or land imprinter. The operational steps to revegetate using these types of surface roughening are described below. Contour Furrowing When contour furrowing is used as the surface roughening feature the • following steps will be taken to revegetate redistributed Rotocleared topsoils that have been stockpiled. After topdressing, the area will be Renewal-3 9.9-19 June 13, 1997