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<br />Janet Binns <br />Page 4 <br />May 14, 1998 <br />Calcium (mg/I) 403 468 <br />Sodium (mg/I) 175 71 <br />Magnesium (mg/1) 211 254 <br />Potassium (mg/I) N/A N/A <br />Sulfate (mg/I) 1790 1860 <br />Bicarbonate (mg/I) 613 636 <br />Total Dissolved Solids (mg/1) 3060 3210 <br />Compazison of water sampling results from well 008-77-58 to spoil water quality data indicate a <br />distinct and recognizable movement of spoil water 500 feet downgradient to well 008-77-58. <br />Increased concentrations in the spoil water of calcium, magnesium, sulfate, and bicazbonate <br />cause slightly elevated levels of the same constituents in 008-77-58 over the baseline conditions. <br />A decreased spoil water concentration of sodium, likely due to cation exchange, appeazs to cause <br />a decrease in sodium concentration in the well water when compazed to the baseline condition. <br />Although changes in the quality of the water in the monitoring well aze evident, due to dilution <br />and dispersion, it is apparent that water quality downgradient is not impacted to the degree that <br />any current o~future uses will be impaired. Given the large degree of change of water quality <br />over 500 feet, it can be assumed that insignificant changes will occur at any appreciable distance <br />down gradient from the pit. <br />Bedrock Water Quantity <br />Figure 4 of the 1997 Annual Hydrology Report for Mine No. 3 indicates the water level in well <br />008-79-58 has recovered to the eazly 1979 elevation of 6716 feet M.S.L. and shows a seasonal <br />vaziation of 5 feet. Figure 5 indicates the water level in well 008-79-6, 2500 feet northwest of <br />008-77-58, has been nearly static at approximately 6660 feet M.S.L. with a variation of about 5 <br />feet seasonally. Water level a[ the time of installation of this well indicates the formation was <br />likely already dewatered to some degree by mining activities, so direct correlation to true <br />baseline conditions is not possible. Water levels in both wells aze between 4-16 feet from the <br />surface on average, which indicates neazly complete recovery for this portion of the Twentymile <br />Pazk ground water basin. <br />