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<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 <br />used for each parameter are the same as those listed on the standards <br />table (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 />exc eedence 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 Number of Wells <br />pH (CDOH, irrigation) 2' <br />fluoride (CDOH, irrigation) -3 <br />iron (CDOH, irrigation) 3 <br />. manganese (CDOH, irrigation) 13 <br />In addition, a total of six samples (from five wells) had cadmium values <br />that were less than an elevated detection limit (20 ug/1 vs. a normal <br />detection limit of 3 ug/1) which was higher than the CDOH standard of 10 <br />ug/1. Likewise, the same six samples had lead values that were less <br />than an elevated detection limit (200 ug/1 vs. a normal detection limit <br />of 20 ug/1) which was higher than the CDOH standard of 100 ug/1. 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 />Elevated levels of iron and fluoride may be attributed to natural (i.e., <br /> not mining related) conditions, since elevated levels for those <br /> parameters are not found in Seneca II spoil wells. In the case of <br /> fluoride, the three wells (8P1, 11 and 19) t hat have elevated levels <br /> have histo rically displayed high levels. Those wells are also unique in <br /> displaying a sodium bicarbonate type water; with almost no calcium, <br /> magnesium, or sulfates; and with relatively high pH values. It is <br /> suspected that the high fluoride values are related to this type of <br />9 <br />