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~l Ta61e 9-s-2 <br />Criteria for Evaluating Soil Suitability <br />1 <br />Parameter-Units Threshold Suitability Level <br />2 <br />pH Lift 1 <6.1->7.8 <br />Lift 2 <5.0, >8.4-8.9 <br />Conductivity (mmhos/cm) Lift 7 > 4.0 <br />Lift 2 > 4.0-72.03 <br />Saturation percentage (@) > BO@ <br />< 25~ <br />4 <br />Sodium adsorption ratio Lift 1 >4 <br />Lift 2 > 10-14 <br />Calcium carbonate percentage Lift 1 > 15 <br />Lift 2 >30 <br />Selenium (ppm) > 2 ppm <br />Particle sizes A71 soil textures except: <br />Lift 1 s, 7s, sc, sic, c <br />Lift 2 s, >40-509c <br />6 <br />Coarse fragments (g) Lift 1 > 15P,6 <br />Lift 2 >354 <br />1 The threshold levels are to be used as a guide in evaluating the suitability of a soil <br />material for reclamation. An evaluation should take into account the "total system". <br />Interactive parameters may either nullify or verify the significance of a potential <br />problem. <br />2 Specific single and double lift topsoil salvage procedures and suitability criteria will <br />be-evaluated separately by soil type (prime or non-prime farmland) and land use (premine <br />rangeland, irrigated pastureland, and irrigated hayl and or cropland). <br />3 The actual maximum acceptable salt level will depend on the plant species proposed in <br />the revegetation plan and the potential for uDwa rd salt movement. <br />4 Specific level depends upon clay mineralogy, soil texture, and saturation percentage <br />according to Dol lhopf et a1 „ 7983. <br />s The specific percentage of clay or sand allowed will depend upon clay mineralogy, <br />organic matter content, consistence, soil lift, spoil characteristics, and size of sand <br />fraction. <br />6 These values may vary depending upon the plant species proposed for revegetation in <br />specific locations (e.g., a soil with a high coarse fracment content throughout its <br />profile may be completely salvaged if used for rangeland versus cropland postmine land <br />use). <br />9-s-17 Revised 08/19/88 <br />