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i• <br />2.3.3 Topsoil Handling <br />Topsoil will be stockpiled in the vicinity of the disturbed area through placement <br />by the equipment utilized for removal. Placement will be in 12-inch lifts if the volume of <br />material warrants. Additional machinery such as dozers will be utilized in the stockpile <br />area in order to 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 Figure 2.2-2. The <br />existing stockpile will be enlarged to accommodate the additional material resulting from <br />any new disturbances. The base area of the topsoil stockpile is planned for <br />approximately 12,000 square feet. Maximum stockpile height will vary; however, 2 <br />horizontal to 1 vertical side slopes will be utilized. <br />Multiple passes of placing equipment will be adequate for slope stability on this <br />• <br />small structure. The topsoil stockpile has been sited in consideration of potential <br />surface water run-off originating from precipitation events, and potential disturbance <br />from normal operations. A sedimentation control ditch will be constructed around the <br />perimeter of the topsoil stockpile. This ditch will be of such a size to allow for cleaning <br />as required. Sediment removed from the ditch will be placed back on the stockpile. A <br />silt fence was constructed down gradient of this ditch. Calculations showing that the silt <br />fence (SAE-2) will be able to treat the run-off from a 10 year 24 hour precipitation event <br />are contained in Appendix M. The stockpile will be top graded to prevent concentrated <br />water flow. <br />2-39 <br />During storage, the topsoil stockpile wilt be stabilized with the temporary <br /> <br />revegetation mixture as shown in Table 3.4-2. <br />M`Clane <br />Volume 1 <br />Rev 6/04 <br />