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NPDESII tributary. It recently displays a decreasing TDS trend (SF=0.5), <br />with the peak TDS value occurring in 2002. Well 16 is located <br />immediately below NPDESII on a Grassy Creek tributary. It displays an <br />increasing TDS trend. <br />Three wells; YSAL1, 3, and 12; monitor water quality in the Sage Creek <br />alluvium. Well 1 is the furthest downstream well. It recently displays a <br />stable TDS trend (SF 0.5), with the peak value occurring in October <br />2007. Well 3 is upstream of Well 1, and is located along Sage Creek, <br />just below the discharge from NPDESI2. It displays a slightly increasing <br />TDS, but with the peak TDS value occurring in 1997. Well 12 is the <br />furthest upstream well, and is upgradient of all mining. It displays an <br />increasing TDS trend (SF = 0.5). <br />- Wadge Overburden. Well YOV28 monitors overburden water quality in the <br />Annand Draw basin. It displays a stable TDS trend. Wells YOV29 and 30 <br />exist in the Sage Creek basin. Well YOV29, prior to 1998, never had <br />enough water for sampling. However,, subsequent water levels in this well <br />had increased, and three water samples were collected in 1998 and 1999. <br />In May 2000 this well went dry and continues to be dry. Well YOV30 <br />displays a stable TDS trend. <br />- Wadge Coal. Well YW28 monitors coal seam water quality in the Annand <br />Draw basin. It displays a stable 'I'DS trend. Wells YW29 and 30 exist in <br />the Sage Creek basin. Well YW29 displays a stable TDS trend. Well YW30 <br />displays a recently increasing TDS trend. <br />- Wadge Underburden. Well YWU28 monitors underburden water quality in <br />the Annand Draw basin. It displays an increasing TDS trend. Wells YWU29 <br />and 30 exist in the Sage Creek basin. Well YWU29 displays a stable TDS <br />trend. Well YWU30 recently displays a decreasing TDS trend (SF 0.5) with <br />the peak value occurring in August 2007. <br />- Wolf Creek Coal and Underburden. As of September 2002, Well YWC33 <br />monitors the Wolf Creek coal water quality in the Sage Creek basin. <br />This well displays a stable TDS trend. Mining of this seam began in <br />4