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November 2002. Well YWCU33 now monitors the Wolf Creek underburden water <br />quality in the Sage Creek basin. It displays a decreasing TDS trend. <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 the number of <br />exceedances out of the total number of samples (i.e., 1/2 indicates one <br />exceedance 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 (CDPHE, irrigation) 2/2 <br />Iron (CDPHE, irrigation) 1/2 <br />Manganese (CDPHE, irrigation) 4/6 <br />pH (CDPHE, irrigation) 1/1 <br />In addition, a total of one sample had a cadmium value that was less <br />than an elevated detection limit (30 ug/1 vs. a normal detection limit <br />of 3 ug/1), which was higher than the CDPHE standard of 10 ug/l. The <br />cause of these elevated detection limits was a decision by the <br />laboratory to dilute the samples prior to analyses in order to reduce <br />the effects of interferences (primarily, high salinity). <br />The high fluoride values at Wells YWC33 and YWCU33 are most likely a <br />natural condition associated with a sodium bicarbonate type water. It is <br />suspected that the high fluoride values are related to this type of <br />5