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4 (2.9 feet) would produce a suitable alkaline spoil (see Section 2.04.6, Table 2.04.6 -10). Partial <br />mixing of alkaline and acidic materials is anticipated during cast blastingfre, dozer pushing, <br />and shovel, and truck fleet handling due to the thinness of Units 2 and 4 and the <br />stratification of alkaline and acidic strata. Normal overburden /interburden handling operations -n-ray <br />also effectively bury the acid - forming strata. <br />Typical overburden /interburden handling operations are described in Section 2.05.3, Operation <br />Plan and Section 2.05.4(2)(c), Backfilling and Grading <br />Once topsoil is removed, soft upper overburden (Bench 1 or Unit 1 material) is normally removed <br />by the truck- shove+shovel and truck fleet and taken to the back of the previous pit for backfilling <br />using the same temporary road around the end of the pit. A significant amount of this Bench 1 <br />material is atypically placed immediately below the Eift A Topsoil, Lift B Topsoil or Mixed <br />topsoil O a" areasand subsoil. The amount of Bench 1 placed varies per area. The Cornbi <br />thickness of topsoil and Bench 1 Sdbsoil Substitute will be approximately 4 feet thick. The <br />exception to this is the WlFeproperty on the west side of the permit, where the Combined thiekness <br />vv'" be at least 3.5 feet thick. The Bench 1 material thickness does decreal- --tward and <br />VVF6 w 11 attempt to titilize all the suitable Bench 1 to get the required thicknesses Specified above. <br />, and these thicknesses are shown on Map 2.05.4 -4. Some of this Bench 1 will be used as subsoil, <br />see Mar) 2.05.4 -7. <br />Lower overburden (Bench 2) is usually cast blasted, dozed and loaded /hauled with <br />shove'itr Ecsshovel and trucks and placed in the previous mined out pit for backfilling purposes. <br />As the overburden trucks dump off the backfill spoil dump, large dozer(s) will final grade the truck <br />dump area into the final pre topsoiled contours. This overburden is always buried beneath several <br />feet of Bench 1 in reclamation. <br />The regraded spoil will be mechanically loosened and mixed by ripping, chiseling, or approved <br />alternate forms of scarification. Rocks discovered during scarification on Irrigated Cropland will be <br />removed. The major advantages of scarification are related to the physical properties of the spoil. <br />The topsoil and spoil are scarified to decrease compaction, increase aeration and water movement, <br />August 2013 (PR -08) 2.05.4(2)(d) -4 <br />