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• 0 to 1) was used, which gives maximum smoothing. Finally, this plot is followed by a <br />table listing historic TDS values and percent milliequivalents for major ions. <br />Alluvium. Cme well, YAAL14, monitors water quality in the Armand Draw alluvium. TDS <br />values for thrs well display an increasing trend. <br />Two rolls, YGAL15 and 16, monitor rater quality in the Grassy Creek alluvium. Well 15 is <br />located immediately belOr NPDESII on a Grassy Creek tributary. Zt displays an increasing <br />TDS trend, even before Chia year when mining began in this basin. Well 16 is located on <br />Grassy Creek below the Confluence of the NPDESII tributary. It di splays a decreasing TDS <br />trend. <br />Four wells; YSAL1, 3, B, and 12; monitor rater quality in the Saqe Creek alluvium. No <br />mining has occurred yet in this basin. <br />Wedge Overburden. 'Well YOV2E monitors overburden rater quality in the Armand Draw basin. <br />It displays an increasing TDS trend. Wells YOV29 and 30 exist in the Sage Creek bee in. <br />• Well 29 .historically never had enough water for sampling. Norevet, rater levels in this <br />cell have been increasing, and the first water savq>le ever wag collected this year. <br />Monitoring. at.Well 30 was resumed this year after Doing .discontinued in 1994. <br />Wedge Coal. Well YW2B monitors coal seam rater quality in the Armand Drar basin. It <br />displays a level TDS trend. Wells YW29 and 30 exis t, in the Sage Creek basin. Monitoring <br />at these iro rolls was resumed this year after being discontinued in 1994. <br />Wedge Underburden. Well YWU2B monitors Underburden rater quality in the Armand Drar <br />basin. It displays a decreasing TDS trend. Wells YWU29 and 30 exist in the Sage Creek <br />basin. Monitoring at these two cells ras resumed this year after being discontinued in <br />1994. <br />Wolf Creek Coal and Underburden. Well YWC31 monitors the Wol£ Creek coal rater quality in <br />the Sage Creak basin. Well YWCU31 monitors the Wolf Creek Underburden rater quality in <br />the Sage Creek basin. This cell is normally dry. Mani to ring at these tao cells ras <br />resumed this year after being discontinued in 1994. <br /> <br />5 <br />