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~a <br />Parameter # of Wells / # of Excursions <br />Boron (CDOH, irrigation) 1/2 <br />pH (CDOH, irrigation) 2/2 <br />Fluoride (CDOH, irrigation) 1/1 <br />Iron (CDOH, irrigation) 5/6 <br />Manganese (CDOH, irrigation) 7/14 <br />In addition, a total of six samples (from three wells) 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/1. Likewise, samples from the same wells 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 CDOH <br />standard of 100 ug/1. The cause of these elevated detection limits was a <br />decision by the laboratory to dilute the samples prior to analyses in <br />order to 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. 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 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 hig h values are often com mon, especially in alluvial <br /> material (Hem, 1989, pgs. 86-89). Of the seven wells displaying high <br /> values, only three (WHAL7-2, WOV14 and WW14) are indicating an <br /> increasing trend (all exist in the permit area). It should be noted <br /> that, while the CDOH uses a standard of 0. 2 mg/1, the EPA states that <br />