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• reduction in iron concentrations may be the result of better purging of well bore volumes <br />prior to sampling plus a switch to dissolved concentration analysis. The water quality data <br />for the two Twentymile Sandstone Wells, No. 9 Mine Well and Well 259 show no <br />significant impact or trend. Water quality data are summarized in Tables 16 through 18. <br />Plots of field conductivity over time are presented in Figures 18A and 18B. While the field <br />conductivity appears to be be increasing slightly in the #9 Mine well, this does not appear <br />to be significant in light of the water quality. In summary, the water quality of all three <br />sandstone aquifers do not indicate any significant trends or adverse impacts related to <br />mining at Mines 5 and 6. <br /> <br /> <br /> <br />