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Mine personnel will be instructed that topsoil stockpiles are not to be disturbed or <br />contaminated. Signs will serve as continuing reminders to personnel that stockpile areas <br />are to be preserved and undisturbed. <br />Any topsoil stockpile remaining in place less than 90 days will not be revegetated. The <br />surface of each pile will be left in a roughened condition to retard wind and water <br />erosion. A self - contained V -ditch or berm will be constructed around the perimeter of <br />the stockpile to prevent loss of the topsoil resource. <br />Any topsoil stockpile which will remain in place 90 to 180 days will be stabilized by <br />utilizing an annual grain (barley, oats or wheat) cover crop if the first planting period is in <br />the fall or spring. For topsoil stockpiles created during the summer, these stockpiles will <br />be reseeded with warm season annual grains such as sorghum or sudan grass, which have <br />been shown to be very effective when planted under conditions where it is normally too <br />dry to plant cool season annual grains. The seeding rate for these species will be 70 <br />pound per acre broadcast. <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, and seeding rate for long -term topsoil <br />stockpiles is described in the Revegetation Plan, Section 2.05.4 (2)(e). <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 surfaces in a friable, <br />noncrusted condition and maintain the biological functions of the soil mycorrhizae. <br />Organic matter, soil nitrogen, and microorganism activity will be maintained or enhanced <br />by the seeding of deep rooted species or species with fibrous root systems. <br />Section 2.05.4(2)(d) Page 19 January 2012 <br />