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7 The lower limit of 8 is recommended by Barrett (1980) , DEQ (1985) , <br /> USDA (1983) , OSM (1985) , Schafer (1979, 1980) , and BLM (1977) . Both <br /> DSL (1983) and SEAM (1979) indicate lower limits of 4 and 6 may be <br /> essential for certain plant species. The upper limit of 12 is <br /> proposed by DEQ (1985) and OSM (1985) , whereas USDA (1983) and BLM <br /> (1977) recommend 16, SEAM proposes 9, while DSL (1983) and Schafer <br /> (1979, 1980) specify 8. <br /> 8 These values are recommended by OSM (1985) , DSL (1983) , and DEQ (1985) <br /> with the exception that DEQ (1983) proposes an upper limit of 80. <br /> 9 Specific level depends upon clay mineralogy, soil texture and <br /> saturation percentage according to Dollhopf et al . (1983) and DSL <br /> (1983) . <br /> 10 These values are similar to those recommended by Barrett (1980) , DSL <br /> (1983) , DEQ ( 1985) , USDA (1983) , OSM (1985) , Schafer (1979, 1980) , and <br /> BLM (1977) . <br /> 11 Proposed by OSM (1985) . <br /> 12 These values are similar to those recommended by Barrett (1980) , DSL <br /> (1983) , Schafer (1979, 1980) , OSM (1985) , and BLM (1977) . SEAM (1979) <br /> proposes 12. <br /> 13 Proposed by OSM (1985) . <br /> 14 This value is supported by DEQ (1985) and Smith (1974) . Units are <br /> tons of CaCO3 required per acre furrow slice. <br /> 15 Confirmed by Barth (1986) . These iron levels may not be toxic but may <br /> cause significant nutrient imbalance. <br /> 16 This value is supported by Sutton et al . (1981) . Schafer (1980) <br /> proposes 60. <br /> 17 The actual maximum acceptable molybdenum concentration will depend <br /> upon the plant species proposed in the revegetation plan seed mix and <br /> their potential for molybdenum accumulation. The depth of replaced <br /> topsoil must also be evaluated. <br /> 18 Recommended by DSL (1983) . <br /> 19 Presented by Peabody (1985) from data extrapolated from Neuman and <br /> Munshower ( 1983) . A value of 2 assumes 100% legumes with 2 feet of <br /> topsoil while a value of 8 assumes 100% grasses with 2 feet of <br /> topsoil . An upper limit of 1.0 is proposed by DSL (1983) and DEQ <br /> (1985) . A limit of 0.85 is proposed by Neuman and Munshower (1983) <br /> for a site with no topsoil . <br /> 20 This value is supported by Barth et al . (1981) . <br /> 21 This value is supported by Barth et al . (1981) and Sutton et al . <br /> (1981) . <br /> 6-44 Revised 11/01/86 <br />