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• indicate three distinct water qualify zones. The Perched aquifer is low in TDS (total <br />dissolved solids), conductivity, fluoride, SAR (sodium absorption ratio) and moderate to <br />high in sulfate and pH. The A-Groove and B-Groove aquifers are similar in water quality <br />with moderate TDS, conductivity, SAR, but high fluoride. Although similar, the B-Groove <br />aquifer generally has slightly higher levels of TDS, conductivity, SAR and fluoride. <br />High TDS, conductivity, SAR, magnesium, potassium, and moderate pH characterize <br />the Dissolution Surface aquifer, and until 1993 fluoride levels were moderate. In late <br />1993, a significant increase in the concentration of fluoride was noted in the down-dip <br />Dissolution Surface well. Figure 6-2 illustrates fluoride results of WQ sampling. <br />Sodium and boron WQ results indicated a similar increase but at a lesser rate. <br />n <br />U <br />Alkalinity, bicarbonate and TDS data indicated an increase late in 1993. See Figure 6- <br />3 for illustration of bicarbonate results. Other WQ parameters indicated increased <br />concentrations in late 1993 but lower than the period of record highs, i.e. magnesium, <br />chloride and hardness. Figure 6-4 illustrates chloride results. In late 1993, WQ <br />changed significantly and was characteristic of a mixture with mine water. Most WQ <br />parameters peaked in early 1994 and declined from late 1994 to mid 1995 as a result <br />of water used during recompletion in July 1994, from the A-Groove. In mid 1995-1998 <br />• 43 <br />