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Table 9-4-2 <br /> Criteria Used to Evaluate Topsoill <br /> (or Topsoil Substitutes) Suitability , <br /> Nucla Mine, Montrose County, Colorado, <br /> November, 1986 <br /> Marginally Unsuitable Except <br /> Parameter Suitable Suitable with Amelioration <br /> Texture Class2 'sl ,siiJl cl , c,sic,sc sic, sc and c <br /> scl,;fifs ,lvfs, and sicl with with >50% c; s <br /> sicl with <35%c 35-50%c, ls ,lcs <br /> pH 5.6-8.4 5.0-5.5 or < 5.0 or <br /> 8.5-8.9 > 8.9 <br /> EC(mmhos/cm) <8 8-12 > 12 <br /> SAR <8 z i° 8-14 > 14 <br /> Saturation 25-80 < 25 or <br /> Percentage (%) > 80 <br /> Coarse <20 20-35 > 35 <br /> Fragments(%) <br /> Calcium Carbonate 0-15 15-30 > 30 <br /> Equivalent (%) <br /> Acid Base 0-150 150-300 < 0 or <br /> Potential >300 <br /> Iron (ppm) 2-150 1-2 or < 1 or <br /> 150-300 > 300 <br /> Manganese (Mn) 2-60 1-2 or < 1 or <br /> 60-70 > 70 <br /> 1These suitability levels are to be used as a guide in evaluating the relative <br /> quality of a soil (or soil substitute) material for reclamation. An evaluation <br /> should take into account the "total system". Interactive parameters may either <br /> nullify, verify or intensify the significance of a potential problem. Actual <br /> minimum or maximum acceptable parameter levels will highly depend upon the plant <br /> species proposed in the revegetation plan and the proposed postmining land use. <br /> 2Texture Class symbols include: s-sand, lcs-loamy coarse sand, is-loamy sand, <br /> Ifs-loamy fine sand, lvfs-loamy very fine sand, sl-sandy loam, 1-loam, sil-silt <br /> loam, scl-sandy clay loam, cl -clay loam, sicl-silty clay loam, sc-sandy clay, <br /> sic-silty clay, c-clay. <br /> 3Units are tons of CaCO3 required per acre furrow slice. <br /> 9-4-14 Revised 3/6/87 <br />