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I • calculations. The time frame for baseline conditions is listed under <br />"conditions specified" at the bottom of each page. <br />- Alluvium. One well, YAAL14, monitors water quality in the Armand Draw <br />alluvium. TDS values for this well display an increasing trend (SF=0.5), <br />with the peak TDS occurring in 1998. <br />Two wells, YGAL15 and 16, monitor water quality in the Grassy Creek <br />alluvium. Well 15 is located on Grassy Creek below the confluence of the <br />NPDESII tributary. It displays an increasing TDS trend. Well 16 is <br />located immediately below NPDESII on a Grassy Creek tributary. It <br />displays an increasing TDS trend. <br /> Four wells; YSAL1, 3, 8, and 12; monitor water quality in the Sage Creek <br /> alluvium. Well 1 is the furthest downstream well. It displa ys an <br /> increasing TDS trend. Well 3 is upstream of Well 1, and is located along <br /> Sage Creek, just below the discharge from NPDESI2. It displays a stable <br /> TDS trend since 1998 (SF = 0.5) Well 8 is upstream of Well 3. It <br /> displays an increasing TDS trend. Well 12 is the furthest upstream well, <br /> and is upgradient of all mining. It displays a stable TDS trend (SF = <br /> 0.5). <br />- Wadge Overburden. Well YOV28 monitors overburden water quality in the <br />Armand 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. We11~YOV30 <br />displays a decreasing TDS trend. <br />- Wadge Coal. Well YW28 monitors coal seam water quality in the Armand <br />Draw basin. it displays a slightly increasing TDS trend. Wells YW29 and <br />30 exist in the Sage Creek basin. Well YW29 displays a stable TDS trend. <br />Well YW30 recently displays a stable TDS trend. <br />5 <br />