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3.8 <br />3.3 TOPSOIL PLACEMENT <br />• Prior to placement of topsoil on regraded areas, the regraded material will be conditioned <br />with dozer-mounted scarifiers in order to minimize the interface between topsoil and subsoil and <br />to promote establishment of vegetation and maximize slope stability. Topsoil will be placed in <br />lifts of approximately 4" to 8" in thickness by rubber-tired scrapers. The entire affected surface <br />will subsequently be graded and leveled to achieve the final desired contour of the topsoil layer <br />as shown on Figure 3.1-1. <br />The placement of topsoil will be in a manner that will allow for the even distribution of <br />materials throughout the disturbed area from which topsoil was previously removed and which <br />exhibited salvable material prior to disturbance. The portion of disturbed land located on the <br />canyon floor is primarily associated with road construction and a sedimentation pond. <br />• Topsoil will be placed only when in a moderately dry condition in order to minimize clodding <br />and compaction, which can result from multiple passes with scrapers or other equipment. <br />Placement of topsoil will be inspected as necessary to assure proper depth and soil densities <br />(80 to 95 pounds per cubic foot dry density) are achieved. <br />Disturbances created after the initial mine site construction will have topsoil replaced in <br />depths approximating the depth that existed prior to disturbance. Topsoil will be replaced on the <br />office area to its original depth of two feet, since this area is in an AVF. <br />As shown on Figure 2.2-2, topsoil along the McClave to Munger Road, Glendive and Rivra, <br />existed in 24 inch and 12 inch depths prior to disturbance. No attempt to recreate the exact <br />depth for each area will be made. Rather, the entire road will have topsoil replaced to a depth of <br />18" to approximate premine conditions. <br />C~ <br />~ Volume 1 4.29-96 <br />