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Soil Salvage Thickness. Soil is beneficial for increasing infiltration, improving the seedbed and rooting <br />medium for germination and plant establishment, enhancing nutrient cycling, and serving as a source <br />of seed, rhizomes, and root cuttings chat can promote species diversity. Soil thickness requirements <br />on mined lands are site-specific. The quality of soil and spoil materials, climatic factors. seeded plant <br />specie requirements, and concurrent reclamation practices all influence the optimal soil salvage and <br />replacement thickness fora specific mine site IPinchak et al.. 19851. Often, the quality of spoil <br />material to be covered by soil is the 'major controlling factor (Schuman and Power, 1980; Barth and <br />Martin, 19821. Together, the ultimate soil salvage and replacement thickness and resultant spoil <br />quality, will greatly influence productivity and longevity of the vegetation established on reclaimed <br />lands (Schuman et al., 1985). <br />The suggested salvageable thickness of soil material presented in this section is based on laboratory <br />~ data and extensive field observations, and represent only the suitable sources of soil material. No <br />unsuitable sources of soil will be salvaged and used during reclamation activities. Soil suitability was <br />determined from criteria presented in Tab 9, Soil Baseline Study, Table 2. Soil salvage thickness, <br />presented in Table 21-1, Soil Salvage Volume (Life-of-Minel, and Exhibit 9.1, Soil Types anti Soil <br />Salvage Map, were determined in one-half foot increments after considering soil loss attributed to <br />' brush clearing, slope steepness, and unsuitable inclusions lexcess clay, rock fragments, and shallow ~~ <br />6edrockl. The following sections summarize soil salvage thickness, volumes, and characteristics by <br />map unit for the Yoast soil salvage area. No discussion is presented for Map Units 34F and RO which <br />do not occur within the projected soil salvage area. ' <br />i 2D, 2E, 2F-Reutt Loam. The Routt loam map units occur on the steeply to very steeply sloping I, <br />mountain sideslopes. The soil profile is deep and well developed with a thick, dark colored surface ~~ <br />horizon and subsoil clay accumulation. This soil has a thicker surface horizon than Buckskin, a hiigher <br />subsoil clay content than Foidel, and a deeper subsoil clay zone than Cochetopa. <br />The recommended soil salvage thickness is based exclusively on the thickness of the surface mollic <br />epipedon and transitional horizons since subsurface clay levels are unsuitable. Soil salvage should be <br />terminated at the top of the argillic IBt1 horizon. <br />profiles is 20 inches (Addendum 8, Tab 91. <br />The mean in situ suitable soil thickness for 14 <br />The 20, 2E, and 2F map units consist of 70 percent Routt with 10 percent Routt variant and 5 <br />percent each of Buckskin variant, Cochetopa, Cochetopa variant, and Dunckley variant d <br /> <br />• <br />• <br />8 Revised 2199 <br />