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• New Horizon 2 Mine Topsoil Management Plan <br />This section has been revised for TR-57 in 2008, which addresses the topsoil replacement for <br />the whole permit area, including the change in handling procedures due to the determination of <br />prime farmland in the southwestern portion of the permit in early 2008. <br />The New Horizon 2 Mine topsoil management plan, based upon the detailed soil survey <br />contained in Section 2.04.9, was developed to insure that the most suitable topsoil within the <br />disturbance area is salvaged. The management plan evaluates the topsoil resources and <br />describes salvage depths and techniques, storage, redistribution, and maintenance or testing <br />procedures necessary to restore the disturbed areas to the desired postmine land use. <br />Evaluation of Topsoil Resources <br />The soils found in the New Horizon 2 Mine permit area are typical of soils found in the semi-arid <br />Colorado Plateau Physiographic Province, Canyon Land Section. The soils within the New <br />• Horizon 2 Mine disturbance area prior to mining consist of irrigated cropland, irrigated <br />pastureland (which included hayland), rangeland, or wildlife habitat. Irrigated pasture soils are <br />predominantly moderately deep (20 to 40 inches) to deep (40 to 60 inches) and have developed <br />in local eolian, alluvial and slopewash colluvial materials. Most of the hayland soils are Ustollic <br />Haplargids, Ustic Calciargids, Ustic Haplocalcids or Ustic Haplocambids. The rangeland soils <br />are typically shallow (10 to 20 inches) and have developed in residuum from sandstone. The <br />rangeland soils are Lithic Haplargids, shallow Typic Haplargids, Lithic Ustollic Calciorthids, <br />shallow Typic Haplocalcids, and Lithic Ustic Torriorthents. Also found in the study area are <br />Aquolls and Endoaquepts. These somewhat poorly to poorly drained soils provide wildlife <br />habitat and occur on drainage channels, swales, and low areas and have formed from alluvium <br />and slopewash. <br />The best sources of topsoil material within the New Horizon 2 Mine disturbance area are the <br />7013, D7013, 30C (1988 - 1996 disturbance areas), 98A, 98D and 98E (1999 proposed <br />disturbance area), soil mapping units. These units (98D and 98E) occupy about 52 percent of <br />the proposed 1999 disturbance area. Soil units 98A and 98E were determined to be "prime <br />is (Revised Nov 2008) 2.05.4(2)(d)-12