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• 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 exceeden.ces 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 />n..,-~.~„~,.,- <br />pH (CDOH, irrigation) <br />Fluoride (CDOH, irrigation) <br />Iron (CDOH, irrigation) <br />Manganese (CDOH, irrigation) <br /># of Wells / # of Excursions <br />3/3 <br />3!6 <br />3/5 <br />12/23 <br />In addition, a total of two samples (SBAL68 AND SSP62) 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/:L. Likewise, the same two 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 cau~;e of these elevated detection limits was a decision <br />by the laboratory Y:o dilute the samples prior to analyses in order to <br />reduce 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, three of the wells (8P1, 11 and 19) that have elevated levels <br />have 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 />suspected that the high fluoride values are related to this type of <br />water chemistry (Hem, 1969, pg. 121). All three wells exist within the <br />Seneca II permit boundary. <br />In the case of iron, the one Wadge Underburden well (7) exhibiting high <br />levels may have higher than usual concentrations of iron pyrite in the <br />9 <br />