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Table 2.04.6-5 WDEO Overburden Suitabilitv Criteria <br />Parameter <br />Units <br />Suitable <br />Marginal <br />Unsuitable <br />pH <br />--- <br />5.5-8.5 <br />5.0-5.5 <br />8.5-9.0 <br /><5.0 <br />>9.0 <br />Electrical Conductivity <br />mmhos/cm <br />0-8 <br />8-12 <br />>12 <br />Saturation <br />% <br />25-80 <br /><25 <br />>80 <br />Texture <br />--- <br />clay, silty clay, silt <br />Sodium Adsorption Ratio <br />--- <br />0-10 <br />10-12 <br />10-15 <br />>12 <br />>15 <br />Selenium <br />ppm <br /><0.3 <br />>0.3 <br />Not established <br />Boron <br />ppm <br /><5.0 <br />>5.0 <br />Molybdenum <br />ppm <br /><1.0 <br />>1.0 <br />Not established <br />Nitrate as N <br />ppm <br />< 50 <br />> 50 <br />Aquifer restoration only <br />Acid -Base potential <br />T CaCO3/ 1000 T <br />> -5 <br />< -5 <br />Coarse Fragment <br />% vol <br /><25% <br />25-35 <br />>35 <br />Taken from Wyoming Department of Environmental Quality, Land Quality Division Guidance for overburden geochemical suitability <br />' For fine -textured soils only <br />