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Table 6-9 <br /> Criteria for Evaluating Overburden, Interbuiiden <br /> Underburden and Regraded Spoil Suitability , <br /> Nucla Mine, Montrose County, Colorado <br /> November, 1986 <br /> Parameter Marginally Unsuitable Except <br /> Units Suitable Suitable With Amelioration <br /> pH > 5.52 4.5 - 5.44 <4.5 <br /> <8.53 8.6 - 9.05 > 9.0 <br /> Salinity (mmhos/cm)6 5 8 9 - 127 >12 <br /> Saturation <858 >85 <br /> Percentage (%) > 258 <25 <br /> Sodium Adsorption 51110 12 - 18 >1811 <br /> Ratio < 1410 15 - 22 >2211 <br /> Exchangeable Sodium9 s1512 16 - 18 >1813 <br /> Percentage (%) < 1812 19 - 22 >2213 <br /> Acid Base Potential14 < -5.014 >-5.0 <br /> Iron (ppm) < 30015 >300 <br /> Manganese (ppm) <- 7016 >70 <br /> Molybdenum (ppm)17 < 0.518 0.6 - 2.0 > 2.0 - 819 <br /> Nickel (ppm) < 2020 >20 <br /> Zinc (ppm) < 7021 >70 <br /> 1 These suitability levels are to be used as a guide in evaluating the <br /> degree of suitability for an overburden, interburden, underburden or <br /> regraded spoil material for reclamation. The evaluation should take <br /> into account the "total system". Interactive parameters may either <br /> nullify or verify the significance of a potential problem. <br /> 2 This value is sup <br /> ported by DSL (1983) and OSM (1985) . <br /> 3 This value is sup <br /> ported by SEAM (1979) , DSL (1983) and BLM (1977) . <br /> 4 The low limit of this range is supported by SEAM (1979) and USDA <br /> (1983) . BLM (1977) recommends a lower tolerance limit of 3.5 whereas <br /> DEQ (1985) suggests 5.0. <br /> The upper tolerance limit of this range is recommended by SEAM (1979) <br /> and DEQ (1985) whereas OSM (1985) proposes 8.8. <br /> 6 The actual j n MUM or maximum accepta le salinity level will depend on <br /> the plant species proposed in the revegetation plan, the potential for <br /> upward salt movement and the particle size. <br /> 6-43 Revised 11/01/86 <br />