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3.5.4 Regrading Boxcut Spoils <br /> Boxcut spoils are produced when beginning a new pit or lengthening an existing pit. Because mining <br /> advances eastward from K dip pits and into L & M pits, which are continuations of K pit, no new boxcuts <br /> are anticipated during the permit term. <br /> Additionally, boxcut spoils may be produced as a result of lengthening the existing pits. This could occur <br /> in all pits at the Trapper Mine during the proposed permit period. When a pit is lengthened, care will be <br /> taken to regrade the spoils to insure that the final grades blend into the natural topography of the sur- <br /> rounding areas (refer to the Postmining Topography Map, Map M12, and Section 3.5.3). Alterations to <br /> 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 pits, <br /> the spoils will be recontoured to provide a smooth transition from the regraded areas to the undisturbed <br /> areas. Boxcuts are required occasionally in the ends of the pits to lengthen the pits and will result in more <br /> coal being recovered. The north ends of the pits are where the depth of the coal and the amount of spoil <br /> material is the greatest. The postmining topography map, Map M12, illustrates the final grading of boxcut <br /> 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 /> MAY 21 2013 slaW— <br /> 3-44 <br />