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-12- <br /> TABLE 28: Criteria to Establish Overburden Suitability.* <br /> Surface <br /> (potential root zone ) Aquifer Restoration <br /> Parameter Suitable Unsuitable <br /> Suitable Unsuitable <br /> PH 5.0-9.0 5.0 5.0-90 <br /> 9.0 < 5.0 <br /> EC (Conductivity) <8.0 1/ > 9.0 <br /> 8.0 <br /> mmhos/cm Depends on pre- <br /> mining water <br /> quality and <br /> overburden <br /> quality <br /> Saturation 25-30 < 80 <br /> Percentage > 25 <br /> Texture < 500% clay > 50ro clay <br /> < 85b sand >85% sand <br /> SAR < 10 10 1/ <br /> Depends on <br /> pre-mining <br /> water quality <br /> and overburden <br /> quality <br /> Selenium < 2.0 ppm ,> 2.0 ppm <br /> Depends on <br /> pre-mining <br /> water quality <br /> and overburden <br /> Boron 5.0 ppm quality <br /> 5.0 ppm Depends on <br /> pre-,,,i n i na <br /> water oual i Tv <br /> and overburden <br /> Nitrate/Nitrogen quality <br /> V < 50 ppm S 50 ppm <br /> Molybdenum 7 .0 ppm 1 .0 ppm <br /> Copper 2/ <br /> Lime /, 30 0 >30% <br /> Acid-base Pot. -5 tons <br /> 3/ < -5 tons 1 <br /> tons <br /> Ca'03 equi v- ''aCO3 equi v- ^� -� <br /> al ent/1000 al ent/1000 CaCO3 eau-iv- <br /> al tons tons ent/10Oo <br /> tons <br />