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• presented in Figure 14. The conductivity measurements recorded at well 81-01 <br /> continue to stabilize at values near those typically observed for the other Middle <br />Sandstone wells (TRH AND TR-7A). Wells TR-7A and TR-4 indicate slight reduction <br />in concentrations of major ions over time. Historically, all three wells show reduction in <br />concentrations of iron which shows considerable variation in concentrations. The <br />general reduction in iron concentrations may be the result of better purging of well bore <br />volumes prior to sampling plus a switch to dissolved concentration analysis. <br />The 1997 field parameter data for the two Twentymile Sandstone wells (No. 9 Mine Well <br />and Well 259), suggest significant impact or trend. Water quality data for the <br />Twentymile Sandstone wells are summarized in Tables 13 through 16. Plots of field <br />• conductivity over time are presented in Figure 15. Measurements during 1997 <br />appeared normal. <br />In summary, the water quality of all three sandstone aquifers does not indicate any <br />significant trends or adverse impacts related to mining at Mines 5 and 6. <br />COAL <br />FLOWS <br />Plots of the measured discharges for the two #5 Mine discharge points are presented in <br />Figure 16. Figure 17 is a monthly tabulation of meter readings for 1997. While in <br />temporary cessation, the mine is being flooded and pumps are being run only <br />• C-91-044 1997AHR Page 6 <br />