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_12_ <br />TABLE 6. (pace 2) <br />• <br />September 16, 1982 <br />Chenical Parameter Justification <br />Sodium Adsorption Ratio (SAR) an indicator of the irrigation potential of water; <br /> an indicator of the dispersing character of the <br /> clay fraction of rock materials; an indicator of <br /> the infiltration capacity of rock materials. <br />Major Ammonia (NH3) a major component of amrsnnium-nitrate explosives <br />Ions commonly used at surface mines in the western U.S. <br />Bicarbonate (HCOj) a predominant anion in mine drainage at the Edna <br /> Mine, concentration increased above background levels <br /> (Skogerbce, et al., 1979); needed to evaluate ion <br /> balances. <br />Calcium (~a+?) a predominant cation in mine drainage at the Edna <br /> Mine, rnncentration increased above background levels <br /> (Skogerbce, et a1., 2979); concentrations may <br /> increase in waters near surface mines in the western <br /> U.S. (Everett, 1979); needed to evaluate ion <br /> balances; needed to calculate SAR. <br />Carbonate (C03} an indicator of proper monitor well completion and <br />• reliability of ground water quality data. <br />Chloride (CI ) a major component of chemical dust suppressants <br /> commonly used at coal mines in the western U.S. <br />Magnesium (lQg+2) a predominant cation in mine drainage at the Edna <br /> Mine, concentration increased above background levels <br /> (Skogerbce, et a1., I979); concentrations may <br /> increase in waters near surface mines in the wester. <br /> U.S. (Everett, 2979); needed to evaluate ion <br /> balances; needed to calculate SA;c. <br />Nitrate-Nitrite a major component of amrnonium-nitrate explosives <br />commonly used at surface mines in the western U.S.; <br />an indicator of spoils material suitability as a <br />plant growth aedium; a common constituent of <br />fertilizers spread on reclaimed areas. <br />Phosphate (POg3 as P) a common constituent of fertilizers spread on <br />reclaimed areas. <br />Sodium (Na ) a predominent cation in mine drainage at tie Edna <br />Mine, concentration increased above background levels <br />(.McWhorter, et a1., Z975); concentrations may <br />increase in waters near surface mines in the westez-n <br />• U.S. (Everett, 1979); needed to evaluate ion <br />balances; needed to calculate SAR. <br />