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exceedences out of the total number of samples (i.e., 1/2 indicates one <br />exceedence 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 <br />boron (CDOH, irrigation) <br />pH (CDOH, irrigation) <br />fluoride (CDOH, irrigation) <br />iron (CDOH, irrigation) <br />manganese (CDOH, irrigation) <br /># of Wells / # of Excursions <br />1/2 <br />1/2 <br />1/3 <br />3/5 <br />9/17 <br />In addition, a total of six samples (from four 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 <br />10 ug/1. Likewise, samples from the same wells had lead values that were <br />less than an elevated detection limit (200 ug/1 vs. a normal detection <br />limit of 20 ug/1), which was higher than the CDOH standard of 100 ug/1. <br />The 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 may be attributed to natural (i.e., not mining <br />related} conditions, since elevated levels for that parameter are not <br />normally found in spoil wells at the adjacent Seneca ZI Mine. The two <br />bedrock wells (WW14 and WTC201) that often exhibit high levels may have <br />higher than usual concentrations of iron pyrite in the rock. Well WTC201 <br />(Trout Creek Sandstone, shop well) often displays high iron values, but <br />does not display an increasing trend. Wadge coal well WW14 started <br />displaying high iron values in 2998 and displays an increasing trend. <br />The high levels of iron displayed in the one alluvial well (WHAL7-2) may <br />be the result of organic matter and plant debris present in the alluvium <br />(Hem, 1989, pg. 77). All wells with high iron values exist within the <br />Seneca II-W permit boundary. <br />L _J <br /> <br />• I <br />10 <br />