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{' 1 <br />U <br /> <br />PARAMETER <br />SUITABLE MARGINALLY <br />SUITABLE UNSUITABLE EXCEPT <br />WITH AMEILORATION <br />Copper (ppm) 0.2-3029 <0.2 >30 <br />Nickel (ppm) <2.028 2-20 >20 <br />Selenium (ppm) <p,230 0.2-0.5 >0.5" <br />Arsenic (ppm) <2.032 >2.0 <br />Cadmium (pm) <533 >5 <br />Mercury (ppm) <0.534 >0.5 <br />Lead (ppm) <1035 10-100 >10025 <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 (1985a). <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 />• Revised 9/99 2.04.6-25 <br />