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method known as LOWESS (Locally Weighted Scatter plot Smoothing). Unless • <br />otherwise noted, smoothness factor (SF) of 1 (on a scale of 0 to 1) was <br />used, which gives maximum smoothing. This plot is followed by a table <br />listing historic TDS values and percent milliequivalents for major ions. <br />Finally, a statistical report representing baseline (i.e., premining) <br />data for each well (when available) is presented in Appendix C1. On this <br />statistics report, "censored data" refers to analytical values that were <br />below the detection limit, which were censored from the min/max/mean <br />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 Annand Draw <br />alluvium. TDS values for this well display a stable trend (SF=0.5), with <br />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 Gras sy Creek below the confluence of the <br />NPDESil tributary. It displays an increasing TD S 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 stable <br />TDS trend (SF = 0.5). Well 8 is upstream of Well 3. It displays an <br />increasing TDS trend. Well 12 is the furthest upstream well, and is <br />upgradient o£ all mining. It displays an increasing TD5 trend. <br />- Wadge Overburden. We11 YOV28 monitors overburden water quality in the <br />Annand Draw basin. It displays a slightly increasing TDS trend. We11s <br />YOV29 and 30 exist in the Sage Creek basin. Well YOV29, prior to 1998, <br />never had enough water for sampling. However, subsequent water levels in <br />this well had increased, and three water samples were collected in 1998 <br />and 1999. In May 2000 this well went dry and continues to be dry. Well • <br />YOV30 displays a decreasing TDS trend. <br />5 <br />