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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. <br />Two wells, YSALI and 3, monitor water quality in the Sage Creek <br />alluvium. Well I 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 an increasing TDS. <br />- Wadge Overburden. Well YOV30 displays an increasing 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, with the peak value occurring in <br />2005. Mining of this seam began in November 2002. Well YWCU33 now <br />monitors the Wolf Creek underburden water quality in the Sage Creek <br />basin. It displays a decreasing TDS trend with the peak value occurring <br />in August 2003. <br />Comparison of Ground Water QualitV to Water Use Standards. SCC has <br />compiled a list of ground water standards for agricultural uses (Table <br />5). This list is composed of Colorado Department of Health ground water <br />standards (CDPHE, Reg. 41, May 2006). <br />Table 6 provides a comparison of ground water quality to agricultural <br />standards. This Paradox database generated table does not include the <br />units of concentration (mg /l or ug /1) for each parameter. The units used <br />for each parameter are the same as those listed on the standards table <br />(Table 5) and are also the same as those used in the water quality <br />reports. The frequency column on Table 6 indicates, in this order: <br />4 <br />