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from the southeast to the northwest as reflected on Figure 11. The piezometric contour map of the <br />Twentymile Sandstone is presented as Figure 12. This gradient remains generally consistent with previous <br />years, according to 2013 measurements. <br />Water Quah <br />The 2013 field parameter data for No. 5 Mine well do not suggest any significant mining related water quality <br />impacts to the Trout Creek Sandstone. The water quality data for this Trout Creek Sandstone well is <br />summarized on Tables 5 and 6. A plot of field conductivity measurements is presented in Figure 13. Note <br />that conductivity values for the No, 5 Mine well appear elevated to levels seen in the early 1980's, but appear <br />to be in the same range as the former Okie Plaza well. This may be related to consistent pumping at this site. <br />WFM will continue to monitor this site and to determine the reason for this effect. <br />The field parameter data for the three Middle Sandstone wells (TR-4, TR -7a, 81 -01), again, suggest no <br />adverse impact or trend. Water quality data are summarized in Tables 7 through 12. Plots of field <br />conductivity for these Middle Sandstone Wells are presented in Figure 14. The conductivity measurements <br />recorded at well 8 1 -01 remain stabilize compared to historic values. Middle Sandstone wells TR-4 AND TR- <br />7A have exhibited some elevated values in 2013. Again, WFM will continue to monitor these sites to <br />determine the reason for this effect. <br />Wells TR -7A and TR4 have historically indicated a slight reduction in concentrations of major ions over <br />time. Historically, all three wells have shown a reduction in concentrations of iron which shows considerable <br />variation in concentrations. The general reduction in iron concentrations may be the result of better purging <br />of well bore volumes prior to sampling. <br />The 2013 field parameter data for the two Twentymile Sandstone wells (No. 9 Mine Well and Well 259), do <br />not suggest significant impact or trend. Water quality data for these Twentymile Sandstone wells are <br />summarized in Tables 13 through 16. Plots of field conductivity over time are presented in Figure 15. IN <br />2010 the 9 Mine Well exhibited a jump in conductivity, and has since stabilized at the higher level. Similarly, <br />Well 259 exhibited a jump in conductivity in 2011, stabilized through 2012, and again exhibited a drop in <br />conductivity in 2013. The reason for these fluctuations is unknown. <br />In summary, elevated conductivity values were detected in the Trout Creek and Middle Sandstones. However <br />the overall water quality of these, as well as the Twentymile Sandstone does not indicate adverse impacts <br />related to Mines 5 and 6. <br />Note that the 7 North Angle well pump has not resulted in discharge to Williams fork River since 2002. The <br />No. 5 Mine pump was the only active pumping performed at the mine in 2013. The No. 5 Mine pump was <br />turned off in late July 2013, and the site de- energized. No further pumping at this site is anticipated in the <br />near future. pump A plot of the measured discharge for this point is presented in Figure 16. Figure 17 is a <br />monthly tabulation of flow measurements for 2013. <br />Page 5 <br />1: \ Env \Empire\AH R\2013 \Test \Empire2013 AH R.doc <br />