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• Sandstone Well is summarized on Tables 5 and 6. A plot of field conductivity <br />measurements is presented in Figure 13. <br />The data for the three Middle Sandstone Wells which are monitored for water quality <br />show no adverse impact or trend. Water quality data are summarized in Tables 7 <br />through i2. Plots of field conductivity for these Middle Sandstone Wells are presented <br />in Figure 14. Wells TR-7A and TR-4 indicate slight reduction in concentrations of <br />major ions over time. All three wells show reduction in concentrations of iron which <br />shows considerable variation in concentrations. The general reduction in iron <br />concentrations may be the result of better purging of well bore volumes prior to <br />sampling plus a switch to dissolved concentration analysis. <br /> <br />The water quality data for the two Twentymile Sandstone Wells, No. 9 Mine Well and <br />Well 259 show no significant impact or trend. Water quality data are summarized in <br />Tables 13 through 16. Plots of field conductivity over time are presented in Figure 15. <br />While the field conductivity appears to be increasing slightly in the #9 Mine well, this <br />does not appear to be significant in light of the water quality. <br />In summary, the water quality of all three sandstone aquifers do not indicate any <br />significant trends or adverse impacts related to mining at Mines 5 and 6. <br />• <br />C-81.044 1995AHR Page 5 <br />