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Ionic Constituents <br />The monitoring wells showed some fluctuation in ionic concentrations this water yeaz. <br />The fluctuations were not consistent as far as the constituents that fluctuated or the wells <br />that showed fluctuations. The majority of the fluctuations were within historic ranges <br />observed for the wells over the last nine water yeazs. Notable changes aze further <br />described below. <br />Ammonia <br />Ammonia concentrations for wells 17-B and 95-1 remained very low and within historic <br />ranges during the 2004 water year. Well 95-1 exhibited a significant rise in ammonia <br />concentrations during the 2000 water yeaz from I.50 mg/L in the second calendar quarter <br />of 2000 to 8.3 mg/L during the first calendaz quarter of 2001. The ammonia <br />concentrations for well 95-1 returned to lower levels in water year 2003 and remained low <br />this year. <br />Bicarbonate <br />Bicarbonate concentrations at well 17-B remained within its historic range this water year. <br />Well 17-B exhibited an initial rise, followed by a drop in concentration during the late <br />winter, followed by a rise through the summer. This appeazs to be a consistent trend for <br />this well. Bicarbonate concentrations at well 95-1 decreased over this water yeaz and <br />reached aten-year low during the third calendar quarter of 2004. If, as noted last year, <br />there was a slowly moving concentration of bicazbonate ions downgradient through the <br />mine over the past several years, the concentration has passed below well 95-1. <br />Calcium <br />Calcium concentrations were elevated during the dry period during the first quarter and <br />fell during the second quarter this water yeaz within the wells. This may be the result of <br />increased concentrations during the drought and decreased concentrations during the <br />rechazge from a significant snow event and corresponding rechazge upgradient. Well 17- <br />B exhibited consistent concentrations between 4.8 and 13.3 mg/L this water yeaz. Well <br />95-1 showed wide fluctuations in calcium concentrations during water yeazs 1997 and <br />1998, with generally consistent concentrations since. The first sampling during October <br />2003 revealed a "spike" in calcium concentrations that did not persist through to the <br />December 2003 sampling. This may have been an artefact of sampling or a widely spaced <br />spike, not unlike that during the third calendar quarter of 1997. <br />Chloride <br />Chloride concentrations in wells 17-B have remained low for the past five water yeazs, <br />near or below detectable limits. Chloride wncentrations were elevated in well 95-1 during <br />Carbon Junct:lon Mine Page to <br />Mnud Hydrobgk P.epartfur Wager Ymr2004 <br />