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• bl <br />(T <br />bl <br />5) <br />d <br />t <br />d <br />d <br />t l <br />th th d i h <br /> ar <br />e <br />an <br />s <br />an <br />s <br />a <br />e <br />a are a <br />so <br />e same as <br />ose use <br />n t <br />e <br /> water quality reports. The f requency 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 # of Wells / # of Excursions <br />pH (CDPHE, irrigation) 3/6 <br />Fluoride (CDPHE, irrigation) 2/4 <br />Iron (CDPHE, irrigation) 4/7 <br />Lead (CDPHE, livestock) 1/1 <br />Manganese (CDPHE, irrigation) 13/24 <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 CDPHE <br />standard of 10 ug/1. Likewise, four 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 CDPHE <br />standard of 100 ug/1. The cause of these elevated detection limits was <br />a decision by the laboratory to dilute the samples prior to analyses in <br />order to reduce the effects of interferences (primarily, high salinity). <br />Spoil Well 61 slightly exceeded the lead standard, 100 ug/1, with a <br />value of 110 ug/1 in May 2007. This was a transitory excursion. All <br />values before this event, and the one value in October 2007, were all <br />less than the standard. <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 two wells (8P1 and 11) that have elevated levels have <br />• historically 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 />7 <br />