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i <br />Parameter-Units <br />pH <br />Conductivity (mmhos/cml' <br />Saturation percentage <br />a <br />Sodium adsorption ratio <br />Calcium carbonate percentage <br />6 <br />Particle size <br />TABLE 9-2 <br />Criteria for Evaluating Soil Suitability <br />z <br />Suitability Level <br />Rock fragments percentage <br />ABP, tons CaC03 per 1000 tons of topsoil <br />Boron Ippm) <br />Copper lppml <br />Zinc Ippm) <br />Molybdenum Ippm) <br />Selenium Ippm) <br />5.0-6.5 <br />0.0-B.0 <br />26-80 <br />0-10 <br />0-15 <br />All soil textures except: <br />sand, loamy sand, silty clay, clay, <br />and sandy clay <br />Igreaterthan 40 percent clay) <br />0-35 <br />greater than Imore positive) than -15 <br />0.5-5 <br />0.5-30 <br />1.0-70 <br />0.0-1.0 <br />0.0-0.1 <br />1Secondary suitability criteria including depth io bedrock, depth to ground water, consistence, organic <br />matter content, and slope steepness were also utilized to determine <br />topsoil salvage depths. <br />2The range of given values constitute suitable levels for the particular soil parameters. The ttveshold <br />levels are to be used es a guide in evaluating the suitability of a soil material for reclamation. An . <br />evaluation should take into account the "total system". Interactive parameters may either nullify or <br />verify the significance of a potential problem. <br />3The actual maximum acceptable salt level will depend on the plant species proposed in the <br />revegetation plan end the potential for upward salt movement. <br />4Specific level depends upon clay mineralogy, soil texture, and saturation percentage <br />according to Dollhopf, 1983. <br />• <br />16 <br />