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iii iiiiiiiiiiiu iii <br />999 <br /> <br />Table 9-4-2 <br />Criteria Used to Evaluate Topsoil <br />Substitutes) Suitabilityl, <br />Nucla Mine Montrose County, Colorado, <br />November, 1986 <br /> Marginally Unsuitable Except <br />Parameter Suitable Suitable with Amelioration <br />Texture Class2 Csl,sil,l cl, c,sic,sc sic, sc and c <br /> s~ifi ;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 /> <br />EC(mmhos/cm) "~ ~ 4 <br /><8 <br />8-12 <br />> 12 <br />SAR <8 ~4 8-14 > 14 <br />Saturation 25-80 ~ < 25 or <br />Percentage (%) > 8U <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 />Potential3 >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 />lfs-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 CaC03 required per acre furrow slice. <br />9-4-14 Revised 3/6/87 <br />