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• rapid (about 1.0 to 6.0 inches per hour), and cation exchange capacity low to moderately low (5 to <br />10 milli-equivalents per 100 grams). Since the overburden contains a mixture of soft, slightly hard, <br />hard, and extremely hard rock fragments, the spoil will generally possess acceptable root growth <br />and water holding characteristics. <br />The chemical properties of the overburden/interburden are also quite favorable. Sodicity and <br />salinity levels are low to moderate in the New Horizon 2 permit area and should pose no severe <br />problem to successful reclamation. Salinity levels in the upper four feet of regraded spoil will likely <br />be comparable to premining values. <br />New Horizon Mine Topsoil Management Plan <br />The New Horizon Mine topsoil management plan, based upon the detailed soil survey contained <br />in Section 2.04.9, was developed to insure that the most suitable topsoil within the disturbance <br />area is salvaged. The management plan evaluates the topsoil resources and describes salvage <br />depths and techniques, storage, redistribution, and maintenance or testing procedures necessary <br />to restore the disturbed areas to the desired postmine land use. <br /> <br />Evaluation of Toasoil Resources. The soils found in the New Horizon 2 Mine permit area are <br />typical of soils found in the semi-arid Colorado Plateau Physiographic Province, Canyon Land <br />Section. The soils within the New Horizon 2 Mine disturbance area support either pastureland, <br />hayland, or wildlife habitat. Hayland soils are predominantly moderately deep (20 to 40 inches) to <br />deep (40 to 60 inches) and have developed in local eolian, alluvial and slopewash colluvial <br />materials. Most of the hayland soils are Ustollic Haplargids, Ustic Calciargids, Ustic Haplocalcids <br />or Ustic Haplocambids . The pastureland soils are typically shallow (10 to 20 inches) and have <br />developed in residuum from sandstone. The pastureland soils are Lithic Haplargids, shallow <br />Typic Haplargids, Lithic Ustollic Calciorthids, shallow Typic Haplocalcids, and Lithic Ustic <br />Torriorthents. Also found in the study area are Aquolls and Endoaquepts. These somewhat <br />poorly to poorly drained soils provide wildlife habitat and occur on drainage channels, swales, and <br />low areas and have formed from alluvium and slopewash. <br />The best sources of topsoil material within the New Horizon 2 Mine disturbance area are the 706, <br />D70B, 30C (1988 - 1996 disturbance areas), 98D and 98E (1999 proposed disturbance area), soil <br />(xevieea is xo~ az> 2.05.4(2)(d)- 7 <br />