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TABLE 2 <br />Crfterla for Evaluating Soll Sultablllty • <br />Parameter•Unlts' Sultablllty Level' <br />pH 5.0 - 8.5 <br />Conductivity (mmhos/cm)' 0.0 - 8.0 <br />Saturation percentage {%) 26 - 80 <br />Sodium adsorption ratio` 0 - 10 <br />Calcium carbonate percentage 0 - 15 <br />Particle sizes All soil textures except: s, Is, sic, c, <br />and sc (greater than 40% clay) <br />Rock fragments (%) 0 - 35% <br />' Secondary suitability criteria including depth to bedrock, depth to groundwater, consistence, organic <br />matter content, and slope steepness were also used to determine soil salvage depths. <br />x The threshold levels are to be used as a guide in evaluating the suitability of a soil material for <br />reclamation. An evaluation should take into account the "total system " Interactive parameters may either <br />nullify or verify the significance of a potential problem. <br />' The actual maximum acceptable saR level will depend on the plant species proposed in the revegetation <br />plan and the potential for upward salt movement. A higher limit, i.e., 12.0 mmhos/cm may be acceptable <br />for saR-tolerant species. • <br />` Specific level depends upon clay mineralogy, soil texture, and saturation percentage according to <br />Dollhopf, 1983. <br />s The spec'rfic percentage of clay or sand allowed will depend upon clay mineralogy, organic matter content, <br />consistence, spoil characteristics, and size of sand fraction. <br />16 • <br />