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• method known as LOWESS (Locally Weighted Scatter plot Smoothing). A <br />smoothness factor of 1 (on a scale of 0 to 1) was used, which gives <br />maximum smoothing. This plot is followed by a table listing historic TDS <br />values and percent milliequivalents for major ions. Finally, a <br />statistical report representing baseline (i.e., premining) data for each <br />well (when available) is presented in Appendix C1. On this statistics <br />report, "censored data" refers to analytical values that were below the <br />detection limit, which were censored from the min/max/mean calculations. <br />The time frame for baseline conditions is listed under "conditions <br />specified" at the bottom of each page. <br />- Alluvium. One well, YAAL14, monitors water quality in the Annand Draw <br />alluvium. TDS values for this well display an increasing trend. <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 displays 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 <br />slightly increasing TDS trend, but also did so prior to mining. Well 8 <br />is upstream of Well 3, and is upstream of the current mining area. It <br />displays an increasing TDS trend. Well 12 is the furthest upstream well. <br />It displays a level TDS trend. <br />- Wadge Overburden. Well YOV28 monitors overburden water quality in the <br />Annand Draw basin. It displayed an increasing TDS trend until 1998, but <br />now displays a decreasing trend. Wells YOV29 and 30 exist in the Sage <br />Creek basin. Well YOV29, prior to 1998, never had enough water for <br />sampling. However, subsequent water levels in this well had increased, <br />• and water samples were collected in 1998 and 1999. In May 2000 this well <br />5 <br />