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quality data collected during the past two years, along with sampling <br />remarks. This is followed by a plot of TDS versus time for the entire <br />period of record. The regression line on this plot is generated by a <br />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 Grassy Creek below the confluence of the <br />NPDESII tributary. It displays an increasing TDS trend (SF=0.5), with <br />the peak TDS value occurring in 2002. Well 16 is located immediately <br />below NPDESII on a Grassy Creek tributary. It displays an increasing TDS <br />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 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 />Annand Draw basin. It displays a stable TDS trend. Wells YOV29 and 30 <br />4 <br />