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A statistical report representing baseline (i.e., premining) data for <br />each well (when available) is presented in Appendix Cl 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 TDS trend with <br />the peak value occurring in May 2008. <br />One well, YGAL16, monitors water quality in the Grassy Creek alluvium. <br />This well is located immediately below NPDESII 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 YSAL3, monitor water quality in the Sage Creek <br />alluvium. Well 1 is the furthest downstream well for the Yoast Mine. It <br />displays an increasing TDS trend, with the peak value occurring in <br />October 2007. Well 3 is upstream of Well 1, and is located along Sage <br />Creek, just below the discharge from NPDESI2. It displays an increasing <br />TDS trend with the peak value occurring in May 2011. <br />- Wadge Overburden. Well YOV30 displays an increasing TDS trend. <br />However, the peak values occurred in September 1992 and September 2014. <br />- Wadge Coal. Well YW30 displays an increasing TDS trend, with the peak <br />value occurring in May 2014. <br />- Wadge Underburden. Well YWU30 displays a decreasing TDS trend with <br />the peak values occurring in December 1990 and August 2007. <br />- Wolf Creek Coal and Underburden. As of September 2002, Well YWC33 <br />monitors the Wolf Creek coal water quality in the Sage Creek basin. This <br />well displays a decreasing TDS trend, with the peak value occurring in <br />2005. Mining of this seam began in November 2002. Well YWCU33 now <br />4 <br />