Laserfiche WebLink
• Aself-contained V-ddch or berm will be constructed around the perimeter of the stockpile, when necessary, <br />to prevent loss of the topsoil resource (see Sediment and Water Control Facility Plan section of Tab 13). The <br />berms, ditches, and sediment traps will typically be used when stockpiles are located on steep slopes, where <br />vegetation establishment is delayed, or where runoff from the pile is not routed through a sediment pond. <br />Any topsoil stockpile which will remain in place less than 90 days will not be revegetated. The surface of <br />each pile will be left in a roughened condition to retard wind and water erosion. <br />Any topsoil stockpile which will remain in place 90 to 180 days will be stabilized by utilizing an annual grain <br />(wheat or barley) cover crop. The seeding rate and method is described in Tab 22, Revegetation Plan, Seed <br />Mixes and Planting Lists section. <br />Protection and maintenance of "long-tens" topsoil stockpiles will begin when a stockpile is temporarily or fully <br />completed and no more additions or withdrawals of topsoil are to be made within a 180 day time period. <br />Topsoil stockpiles will be stabilized pdmarily by perennial plant establishment. The seed mixture, seeding <br />method, and seeding rate for long-term topsoil stockpiles is described in the Revegetation Plan, Tab 22, <br />Seed Mixes and Planting Lists section. <br />• Establishing vegetative cover will aid in overall stabilization and erosion control of stockpiles. Vegetative <br />cover will aid in reducing runoff and raindrop impact and will increase moisture infittra5on by maintaining the <br />upper soil surface in a friable, noncrusted condition. Organic matter, soil nitrogen, and miao-organism <br />activity will be maintained or enhanced by the seeding of deep rooted species or species with fibrous root <br />systems. <br />The height of stockpiles wilt be restricted to less than 20 feet, when possible, to prevent excessive wind <br />erosion, soil compaction, and anaerobic reducing conditions at the stockpile bases. <br />Topsoil Replacement. Topsoil will be replaced only when the approved postmine contours are achieved and <br />when no additional disturbance is anticpated. The topsoil salvage and replacement schedule for the II-W <br />Mine Area is presented on Table 21-4A. The Topsoil removal and replacement schedules have been <br />centinualty estimated by adding and subtratfting acres and volumes since odginaly projected in 7999. SCC <br />has combined Tables 27-4A and 21-46 to reflect actual conditions reported in the Annual ReGamation <br />reports. Since 7999, future topsoil salvage and replacement projections are based on The PRO4 operations <br />plan and schedule. Topsoil will not be replaced on temporary reclamation sites such as haul road ditches, <br />cut slopes <br />PR04 27 Revised 09104 <br />