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TABLE 6-3
<br />
<br />IContinuedl •
<br />Footnotes;
<br />' These suitability levels are to be used as a guide in evaluating the degree of suitability for an
<br /> overburden, underburden, or regraded spoil material for reclamation. The evaluation should take into
<br /> account the "total system". Interactive parameters may either nullify or verify the significance of a
<br /> potential problem.
<br />' This value is supported by MDSL (19941 and USDI-OSMRE (19851.
<br />° This value is supported by USDA (19791, MDSL (19941, and USDI-BLM (19971.
<br />° The low limit of this range is supported by WDEO 119851. USDA (7979) and USDA 11983) recommend
<br /> a lower tolerance limit of 4.5 whereas USDI-BLM 11977) suggests 3.5.
<br />° The upper tolerance limit of this range is recommended by USDA (1979) and WDEO (1985) whereas
<br /> USDI-OSMRE (7985) proposes 8.8.
<br />° The actual minimum or maximum acceptable salinity level will depend on the plant species proposed in
<br /> the revegetation plan, the potential for upward salt movement, and the particle size.
<br />~ The lower Iimii of 8 is recommended by Barrett et al. (19801, WDEO (19851, USDA (1983), USDI-
<br /> OSMRE (79851, Schafer (1979, 19801, and USDI-8LM (19771. Both MDSL (1994) and USDA (1979)
<br /> indicate lower limits of 4 and 6 may be essential for certain plant species. The upper limit of 12 is
<br /> proposed by WDEO 11985) and UDSI-OSMRE 119851, whereas USDA (1983) and USDI-BLM (1977)
<br /> recommend 16, USDA 11979) proposes 9, while MDSL (1994) and Schafer (1979, 1980) specify 8.
<br />° These values are recommended by USDI-OSMRE (19851, MDSL (19941, and WDEO (19851 with the
<br /> exception that WDEO (1985) proposes an upper limit of 80 and MDSL 11994) 90.
<br />° Specific level depends upon clay mineralogy, soil texture, and saturation percentage according to •
<br /> Dollhopf et al. (1985).
<br />10 These values are similar to those recommended by Barrett et al. (1980), MDSL (19941, WDEO (19851,
<br /> USDA (79831. USDI-OSMRE (1985), Schafer (1979, 1980), and USDI-BLM (19771.
<br />" Proposed by USDI-OSMRE (1985).
<br />1z The specific percentage of. clay or sand will depend upon clay mineralogy, size of send fraction, and
<br /> saturation percentage. Abbreviations include: s -sand, M-Cos -medium to course sand, Is -loamy
<br /> sand, sl -sandy loam, si -silt, sil -silt loam, sicl -silty clay loam, sic -silty clay, scl -sandy clay
<br /> loam, cl -clay loam, sc -sandy clay, c -clay.
<br />'~ Very similar to recommendations by Schafer 11979, 1980), USDI-OSMRE (19851, USDA 119831. WDEO
<br /> 119851, USDA 119791.
<br />'• Similar to USDI-OSMRE (19851, USDA (7979) proposes greater than 60% clay.
<br />'S Recommended by MDSL (1994), WDEO 119851, and USDI-OSMRE (19851. Schafer 11979, 79801
<br /> proposes 8. The lower limit recommended by Barth et al. 11987).
<br />16 The actual maximum acceptable molybdenum concentration will depend upon the plant species
<br /> proposed in the revegation plan seed mix and their potential for molybdenum accumulation. The depth
<br /> of replaced topsoil must also be evaluated.
<br />'~ Recommended by MDSL 11994). Barth et al. (1981) and Sutton et al. (1981) recommend 2.0.
<br />•
<br />24 Revised 01102
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