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TABLE 79-2 • <br />CRITERIA FOR EVALUATING SOIL SUITABILITY <br />Parameter-Unitsl <br />Suitability Level2 <br />pH <br />5.0 - 8.5 <br />3 <br />Conductivity (mmhos /cm) <br />0.0 - 8.0 <br />Saturation percentage (X) <br />25 - 80 <br />Sodium adsorption ratio <br />0 - 10 <br />Calcium carbonate percentage <br />0 - 15 <br />Particle sizes <br />All soil textures except: <br />s, 1s, sic, c, and sc <br />(greater than 40%) <br />Coarse fragments (X) <br />0 - 35% <br />1Secondary 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 are to be used as 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 a <br />potential problem. <br />3 The actual maximum acceptable salt level will depend on the plant species proposed <br />in the revegetation plan and the potential for upward salt movement. <br />4 Specific level depends upon clay mineralogy, soil texture, and saturation percentage. <br />5 The specific percentage of clay or sand 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 sand, c-clay, sic-silty clay, and sc -sandy <br />clay. <br />• <br />L7 <br />