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2 - 39 <br />2.3.3 TOPSOIL HANDLING <br />• Topsoil will be stockpiled in the vicinity of the disturbed area through placement by the <br />equipment utilized for removal. Placement will be in 12 inch lifts if the volume of material <br />warrants. Additional machinery such as dozers will be utilized in the stockpile area in order to <br />achieve the design configuration discussed in Section 2.3.4. <br />2.3.4 TOPSOIL STOCKPILE DESIGN AND MANAGEMENT <br />Topsoil will be stockpiled separately at the location shown in Fgure 2.2.2. The existing <br />stockpile will be enlarged to accommodate the additional material resulting from any new <br />disturbances. The base area of the topsoil stockpile is planned for approximately 17,000 square <br />feet. Maximum stockpile height will vary; however, 2 horizontal to 1 vertical side slopes will be <br />utilized. <br />Multiple passes of placing equipment will be adequate for slope stability on this small <br />• structure. The topsoil stockpile has been sited in consideration of potential surface water runoff <br />originating from precipitation events, and potential disturbance from normal operations. A <br />sedimentation control ditch will be constructed around the perimeter of the topsoil stockpile. <br />This ditch will be of such a size to allow for cleaning as required. Sediment removed from the <br />ditch will be placed back on the stockpile. A small sedimentation basin will be constructed down <br />gradient of this ditch. Calculations showing that the sedimentation basin (SAE - 2) will be able to <br />retain the volume of a 25 year 24 hour precipitation event are contained in Appendix M. The <br />stockpile will be top graded to prevent concentrated water flow. <br />During storage the topsoil stockpile will be stabilized with the temporary revegetation <br />mixture (5 Ib/ac Western Wheat grass • Arriba, 5 Ib/ac Streambank Wheat grass • Sodar, and 5 <br />• Ib/ac Thickspike Wheat grass - Critana). <br />Mo Volume 1 4~29~96 <br />