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in order to reduce the effects of interferences (primarily, high salmi tyl. A review of <br /> October 1999 lab data revels no such detectron limit problems fox cadmium or lead, <br /> indicating that the laboratory, as requested by $CC, no longer dilutes the sample to a <br /> point where the detection limit exceeds the cater quality use standard. <br />In the COMG•e review of Ne 1998 AHR, a request was made to explazn the potential sources <br />of elevated levels for certain metals, Chlorrdes, fluorides, and sulfates. Elevated <br />levels of iron, selenium, chlorides, and fluorides may be attributed to natural (i.e., not <br />mining cola tedl condi bona, since elevated levels for those parametara are not normally <br />found in spoil rolls at the adjacent Seneca II Mine. <br />In the case o£ fluorides, the one call (WW171 that had an elevated level last year did not <br />shoe an elevated level this yeaz. In Fact, only one value over 2 mg/1 has ever been <br />observed at this well. As mentioned in Nrs years ARR for Seneca II, elevated fluoride <br />values are often associated with sodium bicarbonate type water, as ie the case with WW17. <br />Only two cells at Seneca II-W display elevated thlorrde values. Well WOV16 has <br />historically displayed only two values over 100 mg/1, and displays no increasrnq trend. <br />Well WRAL7-7 does display an increasing chloride trend. It i9 suspected that the <br />magnesium chloride Goad treatment may be the cause, since this well axis to only about <br />twenty feet from the haul road. If this is the case, then elevated chloride values will <br />be temporary and rill subside after mine shutdown. Besides, water from this alluvial <br />aquifer is not being used for irrigation. <br />Elevated selenium levels were noted at fro wells last year (WDAL11 and WOV161. These reie <br />the first elevated values noted at si Ner cell, but did not xeoccus Nis year. One <br />elevated value was noted this year at Well WOV4-1. This roe from the first sample ever <br />collected at this well and represents pxemining renditions. <br />In the case of iron, the three bedrock wells (WWlG, WWC4, and WTC201) exhibiting high <br />levels may have high Nan usual concentrations of iron pyrite in Ne rock. Well WTC201 <br />!Trout Creek Sancta tone, shop well) often displays high iron values, but does not display <br />an increasing trend. Wedge coal xall WWl< etazted displaying high iron values in 1998 and <br />displays an increasing trend. Wolf Creak coal roll WWCC hm displayed three high iron <br />values. It is located in a premining area. The high levels of iron displayed in the fro <br />alluvial walla (WRAL7-Z and WSALiC) may be the result of organic matter and plant debrra <br />9 <br />