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• 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 a stable TDS trend. <br />J <br />• <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 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 of each standard. <br />Parameter <br />pH (CDOH, irrigation) <br />fluoride (CDOH, irrigation) <br />iron (CDOH, irrigation) <br />manganese (CDOH, irrigation) <br /># of We11s / # of Excursions <br />3/3 <br />3/5 <br />3/6 <br />12/22 <br />In addition, a total of four samples (from three wells) 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, the same four samples had lead values <br />that were less than an elevated detection limit (200 ug/1 vs. a normal <br />detection limit of 20 ug/1), which was higher than the CDOH standard of <br />100 ug/1. The cause of these elevated detection limits was a decision <br />by the laboratory to dilute the samples prior to analyses in order to <br />reduce the effects of interferences (primarily, high salinity). <br />9 <br />