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the Sage Creek basin. Well YW29 displays a stable TDS trend. Well YW30 • <br />recently displays a slightly increasing TDS trend. <br />- Wadge Underburden. We11 YWU28 monitors underburden water quality in <br />the Annand Draw basin. It displays a level TDS trend. Wells YWU29 and 30 <br />exist in the Sage Creek basin. Well YWU29 has recently displayed a <br />slightly increasing TDS trend. Well YWU30 displays a decreasing TDS <br />trend. <br />- Wol£ Creek Coal and Underburden. As of September 2002, Well YWC33 <br />monitors the Wolf Creek coal water quality in the Sage Creek basin. <br />Mining of this seam began in November 2002. Well YWCU33 now monitors the <br />Wolf Creek underburden water quality in the Sage Creek basin. Only two <br />samples from each well have been collected so far. <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 (CDOH, Reg. 41, March 1999). <br />Table 6 provides a compari son 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 the number of <br />exceedences out of the total number of samples (i.e., 1/2 indicates one <br />exceedence out of two samples). Below is a summary of standards that <br />were exceeded. Given in parenthesis is the source and use of each <br />standard. <br />Parameter # of Wells / # of excursions <br />Fluoride (CDOH, irrigation) 1/1 <br />Iron (CDOH, irrigation) 1/2 <br />Manganese (CDOH, irrigation) 3/4 . <br />6 <br />