Laserfiche WebLink
• A self-coniained V-ditch or berm will be constructed around the perimeter of the stockpile, when necessary, <br />to prevent Toss 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 roused 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-term" 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 primarily by perennial plant establishment. The seed miMure, seeding <br />method, and seeding rate for long-term topsoil stockpiles is described in the Revegetation Plan, Tab 22, <br />Seetl 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 infiltration by maintaining the <br />upper soil surface in a friable, noncrusted condition. Organic matter, soil nitrogen, and micro-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 will 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 anticipated. 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 />continually estimated by atlding and subtracting acres and volumes since originally projected in 1999. SCC <br />has combined Tables 21-4A and 21-48 to reflect actual conditions reported in the Annual Reclamation <br />reports. Since 1999, future topsoil salvage and replacement projections are based on the PRO4 operations <br />plan and schetlule. Topsoil will not be replaced on temporary reclamation sites such as haul road ditches, <br />• cut slopes <br />PR04 <br />27 <br />Revised 09!04 <br />