Laserfiche WebLink
• Lead (ppm) <7035 10-100 >70025 <br />Footnotes: <br />1. These suitability levels are to be used as a guide in evaluating the degree of suitability for <br />an overburden, interburden, underburden, or regraded spoil material for reclamation. The <br />evaluation should take into account the "total system". Interactive parameters may either <br />nullify or verify the significance of a potential problem. <br />2. This value is supported by MDSL (1983) and USDI-OSMRE (1985aj. <br />3. This value is supported by USDA (1979), MDSL (1983), and USDI-BLM (1977). <br />4. The low limit of this range is supported by USDA (1979) and USDA (1983}. USDI-BLM <br />(1977) recommends a lower tolerance limit of 3.5 whereas WDEO (1985) suggests 5.0. <br />5. The upper tolerance limit of this range is recommended by USDA (1979) and WDEO <br />(1985) whereas USDI-OSMRE (1985a) proposes 8.8. <br />• 6. The actual minimum or maximum acceptable salinity level will depend on the plant species <br />proposed in the revegetation plan, the potential for upward salt movement, and the particle <br />size. <br />7. The lower limit of 8 is recommended by Barrett et al. (1980), WDEO (1985), USDA <br />(1983),USDI-OSMRE (1985a), Schafer (1979, 1980), and USDI-BLM (1977). Both MDSL <br />(1983) and USDA (1979) indicate lower limits of 4 and 8 may be essential for certain plant <br />species. The upper limit of 12 is proposed by WDEO (1985) and USDI-OSMRE (1985a), <br />whereas USDA (1983) and USDI-BLM (1977) recommend 16, USDA (1979) proposes 9, <br />while MDSL (1983) and Schafer (1979, 1980) specify 8. <br />8. These values are recommended by USDI-OSMRE (1985a), MDSL (1983), and WDEO <br />(1985) with the exception that WDEO (1985) proposes an upper limit of 80. <br />9. Specific level depends upon clay mineralogy, soil texture, and saturation percentage <br />according to Dollhopf et al. (1985) and MDSL (1983). <br />• Revised 27 Aug 2002 26 <br />