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<br />TABLE 6. (page 2) <br /> <br />Saturation Percentage an indicator of the general plant growth medium <br />- potential of rock materials; an indicator of <br />the water holding capacity, expected <br />percolation rate, and clay swelling capacity of <br />rock materials; used to evaluate the accuracy <br />of reported SAR values. <br />Sodium Adsorption Ratio (SAR) an indicator of the irrigation potential of <br />water; an indicator of the dispersing character <br />of the clay fraction of rock materials; an <br />indicator of the infiltration capacity of rock <br />materials. <br />Major Ions: <br />Ammonia (NH3) a major component of ammonium-nitrate <br />explosives commonly used at surface mines in <br />the western U. S. <br />Bicarbonate (HC031 a predominant anion in mine drainage at the <br />Edna Mine, concentration increased above <br />background levels (Skogerboe, et a1., 1979); <br />needed to evaluate ion balances. <br />Calcium (Ca+2) a predominant cation in mine drainage at the <br />Edna Mine, concentration increased above <br />background levels (Skogerboe, et a1., 1979); <br />concentrations may increase in waters near <br />surface mines in the western U.S. <br />(Everett, 1979); needed to evaluate ion <br />balances; needed to calculate SAR. <br />Carbonate (C03) an indicator of proper monitor well completion <br />and reliability of ground water quality data. <br />Chloride iCl-) a major component of chemical dust suppressants <br />commonly used at coal mines in the western U. S. <br />Magnesium (Mg+2) a predominant cation in mine drainage at the <br />Edna Mine, concentration increased above <br />background levels (Skogerboe, et al., 1979); <br />concentrations may increase in waters near <br />surface mines in the western U.S. <br />(Everett, 1979); needed to evaluate ion <br />balances; needed to calculate SAR. <br />