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TABLE 79-2 • <br />CRITERIA FOR EVALUATING SOIL SUITABILITY <br />Parameter-Units Suitability Level2 <br />pH 5.0 - 8.5 <br />3 <br />Conductivity (mmhos/tm) 0.0 - 8.0 <br />Saturation percentage (X) 25 - BO <br /> <br />Sodium adsorption ratio 0 - 10 <br />Calcium carbonate pertentege 0 - 75 <br />s <br />Particle size All soil textures except: <br /> s, 7s, sic, c, and sc <br /> (greater than 40X) <br />Coarse fragments (X) 0 35X <br />ISecondery suitability criteria including depth to bedrock, depth to ground water, <br />consistence, organic matter content, and slope steepness were also utilized to <br />determine topsoil selvage depth. <br />2The threshold levels ere to be used es a guide in evaluating the suitability of • <br />soil material for reclamation. An evaluation should take into account the "total <br />system." Interactive parameters may either nullify or verify the significance of e <br />potential problem. <br />3The actual maximum acceptable salt level will depend on the plant species proposed <br />in the revegetetion plan and the potential for upward salt movement. <br />4Specific level depends upon clay mineralogy, soil texture, and saturation pertentege. <br />SThe specific percentage of clay or send allowed will depend upon clay mineralogy, <br />organic matter content, consistence, spoil characteristics, and size of sand fraction. <br />Texture codes used include S-send, is-loamy send, c-clay, sic silty clay, end sc-sandy <br />clay. <br />• <br />4 <br />