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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. <br />A statistical report representing baseline (i.e., premining) data for <br />each well (when available) is presented in Appendix C1 of the 2010 AHR. <br />On this statistics report, "censored data" refers to analytical values <br />that were below the detection limit, which were censored from the <br />min /max /mean calculations. The time frame for baseline conditions is <br />listed under "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 an increasing trend. However, <br />the peak value occurred in May 2008. <br />One well, YGAL16, monitors water quality in the Grassy Creek alluvium. <br />This well is located immediately below NPDES11 on a Grassy Creek <br />tributary. It displays an increasing TDS trend. However, the peak value <br />occurred in May 2011. <br />Two wells, YSAL1 and 3, monitor water quality in the Sage Creek <br />alluvium. Well 1 is the furthest downstream well for the Yoast Mine. It <br />recently displays a decreasing TDS trend (SF 0.5), with the peak value <br />occurring in October 2007. Well 3 is upstream of Well 1, and is located <br />along Sage Creek, just below the discharge from NPDESI2. It displays an <br />increasing TDS. However, the peak value occurred in May 2011. <br />- Wadge Overburden. Well YOV30 displays an increasing TDS trend. <br />However, the peak values occurred in September 1992 and June 2011. <br />- Wadge Coal. Well YW30 displays a recently increasing TDS trend. <br />However, the peak value occurred in June 2011. <br />3 <br />