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i~ <br /># of Wells / # of Excursions <br />Boron (CDOH, irrigation) 1/2 <br />pH (CDOH, irrigation) 4/4 <br />Iron (CDOH, irrigation) 3/5 <br />Manganese (CDOH, irrigation) 8/15 <br />In addition, a total of six samples (from WOV14, 16, 17 and WW14) had <br />cadmium values that were less than an elevated detection limit (30 ug/1 <br />vs. a normal detection limit of 3 ug/1), which was higher than the CDOH <br />standard of 10 ug/1. Likewise, the same samples had lead values that <br />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 by <br />the laboratory to dilute the samples prior to analyses in order to <br />reduce 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 II 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. We11 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 1998 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 />High manganese values may, in part, be due to recharge from the spoil <br />aquifer, although high values are often common, especially in alluvial <br />material (Hem, 1989, pgs. 86-89). It should be noted that, while the <br />CDOH uses a standard of 0.2 mg/1, the EPA states that this standard is <br />used to protect crops grown in soils with a pH value lower than 6.0. In <br />. soils with a higher pH (as are found in the Seneca II-W region), a more <br />