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• 3.5.4 Reoradina Boxcut Spoils <br />Boxcut spoils are produced when beginning a new pit or lengthening an existing pit. One dragline <br />boxcut will be opened in K-ridge area during the permit term.. Topsoil removal in this area (Map M10 <br />series) will be sufficient to allow the boxcut spoils to be regraded without contamination of adjacent soils. <br />The boxcut spoils will be regraded so that the final grades blend into the natural topography of the <br />surrounding areas. Map M12 shows the approximate postmining contours for these areas. Regrading <br />will begin as soon as practical, usually when three spoils rows are available to regrade (Section 3.5.2). <br />Additionally, boxcut spoils may be produced as a result of lengthening the existing'pits. This could <br />occur in all pits at the Trapper Mine during the proposed permit period. When a pit is lengthened, care <br />will be taken to regrade the spoils to insure that the final grades blend into the natural topography of the <br />surrounding areas (refer to the Postmining Topography Map, Map M12, and Section 3.5.3). Alterations <br />to the regrading program will be made to insure that the regraded area resembles the undisturbed <br />topography of the surrounding areas. <br />At the end of each pit, additional topsoil is salvaged to provide an ample buffer zone. This is required to <br />prevent any contamination of soil materials. In areas where boxcut spoils will occur at the end of the <br />pits, the spoils will be recontoured to provide a smooth transition from the regraded areas to the <br />undisturbed areas. Boxcuts are required occasionally in the ends of the pits to lengthen the pits and will <br />• result in more coal being recovered. The north ends of the pits are where the depth of the coal and the <br />amount of spoil material is the greatest. The postmining topography map, Map M12, illustrates the final <br />grading of boxcut spoils created by extending the pits. <br />The slopes of the regraded areas will be similar to the slopes encountered on the pre-mined land and are <br />also approximated on Map M12, Postmining Topography. <br /> <br />344 Revision: <br />Approved-