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• <br /> <br />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,sil,l,cl, c,sic,sc sic, sc and c <br />scl,lfs,lvfs, and sicl with with >50~ c; s <br />sicl with <35°oc 35-50Yc, ls,lcs <br />pH <br />EC(mmhos/cm) <br />SAR <br />Saturation <br />Percentage (/) <br />Coarse <br />Fragments(%) <br />Calcium Carbonate <br />Equivalent (%) <br />Acid Base3 <br />Potential <br />Iron (ppm) <br />i9anganese (Mn) <br />5.6-8.4 <br /><g <br /><g <br />25-80 <br /><20 <br />0-15 <br />0-150 <br />2-150 <br />2-60 <br />5.0-5.5 or <br />8.5-8.9 <br />8-12 <br />8-14 <br />20-35 <br />15-30 <br />150-300 <br />1-2 or <br />150-300 <br />1-2 or <br />60-70 <br />< 5.0 or <br />> 8.9 <br />> 12 <br />> 14 <br />< 25 or <br />> 8U <br />> 35 <br />> 30 <br />< 0 or <br />>300 <br />< 1 or <br />> 300 <br />< 1 or <br />> 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, ls-loamy sand, <br />lfs-loamy fine sand, lvfs-loamy very fine sand, sl-sandy loaiti, 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 />