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• statistics report is followed by a Dlot of TDS versus time for the entire period <br />of record. The regression line oa this plot is generated by a method known as <br />LOWESS (Locally Weighted Scattexplot Smoothing). A smoothness factor of 1 (oa a <br />stela of 0 to 1) was used, which gives maximum smoothing. Finally, this plot ie <br />Followed by a table listing historic TD9 values and percent milliequivaleata for <br />major ions. <br />- Alluvium. One wall, YAALld, monitors water quality in the Aaaaad Draw <br />alluvium. TDS valves for this well display an iacreaeing tread. <br />Trio walla, Y6AL15 and 16, monitor water quality is the Grassy creek alluvium. <br />Nall 15 is located on brassy Creek below the confluence of the NPDE511 <br />tributary. It dieDlays as inereaeing TDS tread. well 16 is located immediately <br />below NPDE811 on a Oraeey Creak tributary. It 81eDlays a 8acreaeiag TDS tread. <br />Four wells; YSAL1, 3, S, sad 12; monitor water quality is the Sage Creak <br />alluvium. Nell 1 ie the Furthest flowaetreem well. It 8isplnye a nearly level <br />• TDS trend. Well 3 ie upstream of Nell 1, and is located along gage Creak, suet <br />below the discharge from NPDESII. it flisplaye a slightly iaeransiag TDS treafl, <br />but also did eo prior to miaiag. Well 8 ie upetraem of Well 3, and ie upstream <br />of the current miaiag area. It 8leplaye as iacreaeing TDS trend. Well 11 ie <br />the furthest upstream well. It displays n decreasing TDS trend. <br />- Waflge Overburden. Well YOV28 moaitora overburden water quality is the Aaaaad <br />Draw baeia. It displayed as iacreaeing TDS tread until 1998, but saw fliaplays a <br />flecreaeiag trend. Wells YOV29 aa8 30 exist is the Sage Creek basin. Well 29, <br />prior to 1998, never haft enough water for sampling. However, eubeequent water <br />levels in this well had increased, and water ea~lea were collected is 1998 end <br />1999. Ia August 2000 this well went flry. Well 30 displays a decreasing TD8 <br />treafl. <br /> - Wedge Coal. Well YW2B monitors coal seam water quality in the Anaand Drew <br /> baeia. It displays a level TDS treafl. Wells YW29 sad 30 exist is the Sage <br /> Creek baeia. Well 29 disDlsys a decreasing TDS trend. Well 30 has reeeatly <br />• displayed a slightly increasing TDS tread. <br />5 <br />