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Any topsoil stockpile which will remain in place less than 90 days will not be <br /> revegetated. The surface of each pile will be left in a roughened condition to retard <br /> wind and water erosion. A self-contained V-ditch or berm will be constructed around the <br /> perimeter of the stockpile to prevent loss of the topsoil resource (see Sediment and Water <br /> Control Facility Plan section of Tab 13). <br /> Any topsoil stockpile which will remain in place 90 to 180 days will be stabilized by <br /> utilizing an annual grain (wheat or barley) cover crop. The seeding rate will be 20 <br /> pounds (PLS) per acre drilled or 40 pounds (PLS) per acre broadcast (see Tab 22, <br /> Revegetation Plan, Seed Mixes and Plant Material Lists section, Seed Mix No. 4). <br /> Protection and maintenance of "long-term" topsoil stockpiles will begin when a stockpile <br /> is temporarily or fully completed and no more additions or withdrawals of topsoil are to <br /> be made within a 180 day time period. Topsoil stockpiles will be stabilized primarily by <br /> perennial plant establishment. The seed mixture, seeding method, and seeding rate for <br /> long-term topsoil stockpiles is described in the Revegetation Plan, Tab 22, Seed Mixes and <br /> Plant Material Lists section, Seed Mix No. 3. <br /> • <br /> Establishing vegetative cover will aid in overall stabilization and erosion control of <br /> stockpiles. Vegetative cover will aid in reducing runoff and raindrop impact and will <br /> increase moisture infiltration by maintaining the upper soil surface in a friable, <br /> noncrusted condition. Organic matter, soil nitrogen, and microorganism activity will be <br /> maintained or enhanced by the seeding of deep rooted species or species with fibrous root <br /> systems. <br /> The height of stockpiles will be restricted to less than 20 feet, when possible, to <br /> prevent excessive wind erosion, soil compaction, and anaerobic reducing conditions at the <br /> stockpile bases. All topsoil stockpiles will be short term (i.e., three years or less) <br /> which will also be beneficial to microorganism populations. <br /> Topsoil Replacement. Topsoil will be replaced only when the approved postmine contours <br /> are achieved and when no additional disturbance is anticipated. Topsoil will not be <br /> replaced on temporary reclamation sites such as haul road ditches, cut slopes and fill <br /> slopes; pond embankments and spillways; and diversion ditches. Temporary reclamation <br /> . sites will be seeded and stabilized as described in Tab 22, Revegetation Plan. Topsoil <br /> will be replaced within the aforementioned areas once final reclamation is achieved. <br /> 21-28 Revised 08/19/88 <br />