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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. <br />One well, YAAL14, monitors water quality in the Annand Draw alluvium. TDS <br />values for this well display an increasing TDS trend with the peak value <br />occurring 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 with the peak value <br />occurring in May 2011. <br />Two wells, YSAL1 and YSAL3, monitor water quality in the Sage Creek <br />alluvium. Well YSALl is the furthest downstream well for the Yoast Mine. <br />It displays an increasing TDS trend, with the peak value occurring in <br />October 2007. Well YSAL3 is upstream of Well YSAL1, and is located along <br />Sage Creek, just below the discharge from NPDESI2. It displays an <br />increasing TDS trend with the peak value occurring in May 2011. <br />Wadge Overburden. <br />Well YOV30 displays an increasing TDS trend. However, the peak values <br />occurred in September 1992 and September 2014. <br />Wadge Coal. <br />Well YW30 displays an increasing TDS trend, with the peak value occurring <br />in May 2014. <br />4 <br />