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Wadge Underburden. <br />Well YWU30 displays a decreasing TDS trend with the peak values occurring <br />in December 1990 and August 2007. <br />Wolf Creek Coal and Underburden. <br />As of September 2002, Well YWC33 monitors the Wolf Creek coal water <br />quality in the Sage Creek basin. This well displays a decreasing TDS <br />trend, with the peak value occurring in 2005. The May 2017 value is the <br />lowest on record. Mining of this seam began in November 2002. Well YWCU33 <br />now monitors the Wolf Creek underburden water quality in the Sage Creek <br />basin. It had displayed a decreasing TDS trend from 2002 to 2014, however <br />over the past few years the trend has been increasing with the peak value <br />occurring in May 2017. <br />Comparison of Ground Water Quality to Water Use Standards. <br />SCC has compiled a list of ground water standards for agricultural uses <br />(Table 5). This list is composed of Colorado Department of Health ground <br />water 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/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 reports. <br />The frequency column on Table 6 indicates, in this order: uncensored, <br />that is, the number of exceedances above the Method Detection Limit (MDL) <br />/ the number of exceedances between the MDL and the Practical Quantitation <br />Level (PQL) / censored, that is, the number of sample values below the <br />MDL but the MDL was higher than the standard / the total number of samples. <br />Below is a summary of standards that were exceeded in the 2017 water year. <br />Given in parenthesis is the source and use of each standard. <br />5 <br />