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decreased since then. Well 27, the lower well, displays an overall <br />increasing TDS trend, however, TDS values peaked in 1998. <br />Well 61 is located in the southwest portion of the permit area. It <br />displays a decreasing TDS trend. Well 62 is located above NPDES 004. <br />It displays an increasing 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 (CDOH, Reg. 41, November 2004). <br />Table 6 provides a comparison of ground water quality data this year to <br />agricultural standards. This Paradox database generated table does not <br />include the units of concentration (mg/1 or ug/1) for each parameter. <br />The units used for each parameter are the same as those listed on the <br />standards table (Table 5) and are also the same as those used in the <br />water quality reports. The frequency column on Table 6 indicates the <br />number of exceedences out of the total number of samples (i.e., 1/2 <br />indicates one exceedence out of two samples). Below is .a summary of <br />standards that were exceeded. Given in parenthesis is the source and <br />use o£ each standard. <br />De r~e mo4~or <br />pH (CDOH, irrigation) <br />Fluoride (CDOH, irrigation) <br />Iron (CDOH, irrigation) <br />Manganese (CDOH, irrigation) <br /># of Wells / # of Excursions <br />3/4 <br />3/5 <br />4/6 <br />12/22 <br />In addition, a total of three samples from three sites had cadmium <br />values that were less than an elevated detection limit (30 ug/1 vs. a <br />normal detection limit of 3 ug/1), which was higher than the CDOH <br />standard of 10 ug/1. Likewise, £our samples from four sites had lead <br />values that were less than an elevated detection limit (200 ug/1 vs. a <br />normal detection limit of 20 ug/1), which was higher than the CDOH <br />standard of 100 ug/1. The cause of these elevated detection limits was <br /> <br /> <br /> <br />8 <br />