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- Wadge Coal. Well YW30 displays an increasing TDS trend. With the peak <br />value occurrinf 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 />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 Quality 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 2008). <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 /1 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 />uncensored, that is, the number of exceedances above the Method <br />Detection Limit (MDL) / the number of exceedances between the MDL and <br />the Practical Quantitation Level (PQL) / censored, that is, the number <br />of sample values below the MDL but the MDL was higher than the standard <br />/ the total number of samples. Below is a summary of standards that were <br />exceeded. Given in parenthesis is the source and use of each standard. <br />4 <br />