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Iron, potentially dissolved (Fe, pd) <br />The Numeric Standard for potentially dissolved iron is 300 ug/1 (chronic). Monitoring <br />results suggest that downstream concentrations of potentially dissolved iron are below the <br />Numeric Standard, and that Outfall 001 discharges have not elevated concentrations from <br />upstream values. <br />Iron (total recoverable) (Fe, trec) <br />Monitoring results suggest that downstream concentrations of total recoverable iron are <br />below the Numeric Standard, and that Outfall 001 discharges are not worsening the <br />quality (total iron) of water in North Thompson Creek. The Numeric Standard for iron, <br />total recoverable, is 1000 ug/1 (chronic). The measured concentrations for total <br />recoverable iron have ranged from 30 ug/1 to 680 ug/l, with an average of 290 ug/l. <br />Lead (Pb) <br />There has been no monitoring for lead at the downstream monitoring location on North <br />Thompson Creek, thus there is no direct information to determine the current relationship <br />of downstream concentrations of lead with the Numeric Standard. However, monitoring <br />information suggests that there is potential for a rise in lead concentrations between <br />upstream and downstream sampling locations, but that any such rise may not be as a <br />result of Outfall 001 discharges. The Numeric Standard for lead (Pb) (chronic) is 4.6 ug/l. <br />Lead was detected at 2 ug/1 in upstream baseline sampling of August 1981. <br />Concentrations of up to 17 ug/l of lead were detected in baseline September 1978 Mine <br />No. 1 inflow samples, up to 68 ug/1 in baseline Mine 3 inflows. However, lead was <br />undetected in an Outfall 001 sample of July 17, 2001, the last time it was checked. Lead <br />was detected in a September 1978 baseline Spring 1 sample at a concentration of 22 ug/l, <br />in a baseline Spring 2 sample at a concentration of 18 ug/1, and a baseline Mine No. 2 <br />mine water sample at 26 ug/l. <br />Manganese (Mn) <br />Monitoring results suggest that downstream manganese concentrations are below the <br />Numeric Standard, but that Outfall 001 discharges are higher in manganese than <br />upstream and downstream concentrations. The Numeric Standard for manganese is 50 <br />ug/1. On September 25, 2005, manganese concentrations were at 40 ug/1 at both upstream <br />and downstream monitoring points. The measured concentration of manganese at outfall <br />001 has ranged from 20 ug/l to 400 ug/l, with an average of 180 ug/l. The average <br />baseline concentration of manganese in Spring I was 429 ug/l. The average baseline <br />concentration of manganese in Spring 2 was 565 ug/l. <br />Mercury (Hg) <br />There has been no continuous or recent monitoring for mercury at the downstream <br />monitoring location on North Thompson Creek, thus there is no direct information to <br />North Thompson Creek C-1981-025 <br />Permit Renewal 05 <br />12 May 2009 <br />27