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Cadmium (Cd) <br />There has been no continuous or recent monitoring for cadmium at the downstream <br />monitoring location on North Thompson Creek, thus there is no direct information to <br />determine the relationship of downstream concentrations of cadmium with the Numerical <br />Standazd. However, monitoring results suggest that downstream levels of cadmium are <br />below the Numeric Standard, and that there is no contribution of cadmium to North <br />Thompson Creek from Outfa11001 dischazges. The Numeric Standard for cadmium (Cd, <br />chronic, total recoverable) is 3.38 ug/1. Cadmium was undetected in baseline upstream, <br />downstream, Mine No.l and Mine No. 3 samples, and, as might be expected, has been <br />undetected in Outfa11001 discharges. <br />Chromium III and Chromium VI (Cr) <br />There has been no downstream or Outfa11001 monitoring for chromium. Baseline <br />monitoring results indicate that there may be an effect on chromium in North Thompson <br />Creek from Outfa11001 dischazges, but that the Numeric Standazd for chromium is not <br />exceeded in downstream flows. The Numeric Standazd for chromium III (chronic) is 117 <br />ug/1(water hazdness of 175). The Numeric Standazd for chromium VI (chronic) is 11 ug/1. <br />Total chromium was detected in baseline upstream samples up to 1 ug/1. Chromium was <br />undetected in six locations in Mine No. 1, and was detected at 6 ug/1 at one location. <br />Chromium was undetected in samples from Mine No. 3.Outfa11001 discharges have not <br />been tested for chromium, but as chromium was detectable in a baseline Mine No. 1 grab <br />sample, chromium may be present in Outfa11001 dischazges. If so, the concentration <br />would be less than the Numeric Standard of 6 ug/1. <br />Copper (Cu) <br />The Numeric Standazd for copper is 14.42 ug/1. Monitoring results suggest that there is an <br />increase in the concentration of copper in North Thompson Creek and that levels of <br />copper in downstream flows exceed the Numeric Standazd; however, not as a result of <br />Outfall 001 dischazges. On September 8, 2002, copper concentrations rose from an <br />upstream value of 30 ug/1, a value already above the Numeric Standazd, to a downstream <br />value of 40 ug/1. The concentration of copper at 20 ugfl in Outfa11001 was above the <br />Numeric Standard, but below even the upstream value. In a July 17, 2001 sample, copper <br />was undetected. Concentrations of copper were 4,120 ugl1, relatively high, in baseline <br />Portal 2 mine water on June 22, 1982. The reason for the rise in the concentration of <br />copper on September 8, 2002 is unknown. <br />Iron, potentially dissolved (Fe, pd) <br />The Numeric Standazd for potentially dissolved iron is 300 ugfl (chronic). Monitoring <br />results suggest that downstream concentrations of potentially dissolved iron are below the <br />Numeric Standard, and that Outfa11001 discharges aze not elevating concentrations from <br />upstream values. <br />26 <br />