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available) is presented in Appendix Cl. On this statistics report, <br />"censored data" refers to analytical values that were below the <br />detection limit, which were censored from the min/max/mean calculations. <br />The time frame for baseline conditions is listed under "conditions <br />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. <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. <br />Two wells, YSAL1 and 3, monitor water quality in the Sage Creek <br />alluvium. Well 1 is the furthest downstream well. It recently displays a <br />decreasing TDS trend (SF 0.5), with the peak value occurring in October <br />2007. Well 3 is upstream of Well 1, and is located along Sage Creek, <br />just below the discharge from NPDESI2. It displays a slightly increasing <br />TDS, but with the peak TDS value occurring in 1997. <br />- Wadge Overburden. Well YOV30 displays a stable TDS trend. <br />- Wadge Coal. Well YW30 displays a recently increasing TDS trend. <br />- Wadge Underburden. Well YWU30 recently displays a decreasing TDS <br />trend (SF 0.5) with the peak value occurring in 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 (SF 0.5), with the peak value <br />occurring in 2005. Mining of this seam began in November 2002. Well <br />YWCU33 now monitors the Wolf Creek underburden water quality in the Sage <br />Creek basin. It displays a decreasing TDS trend with the peak value <br />occurring in August 2003. <br />4 <br />L <br />E <br />E