2009-05-12_REVISION - C1981025 (8)

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Sulfide (hydrogen sulfide, H2S) There has been no continuous or recent monitoring for sulfide at the downstream monitoring location on North Thompson Creek, thus there is no direct information to determine the relationship of downstream concentrations of sulfide with the Numeric Standard. However, there was baseline, but has been no other, monitoring for sulfide. This baseline monitoring results suggest that sulfide concentrations may be above the Numeric Standard downstream in North Thompson Creek, but that there is no effect from Outfall 001 discharges. The Numeric Standard for sulfide (S, undissociated H2S) is 0.002 mg/1. Sulfide was detected in North Thompson Creek upstream and downstream baseline sampling up to 0.1 mg/l. Sulfide was undetected in Mine No. 1 and Mine No. 3 mine water, the sources of Outfall 001 discharges. There is a distinct hydrogen sulfide odor from Spring No. 1 and the seep below Portal 1, but none has been reported for other locations. Mine water discharge inflows are aerated at the beginning of the treatment system and by the drop outlet at Outfall 001. No sulfur smell at these sites has been reported. Boron (B) The Numeric Standard for boron is 0.75 mg/l. There was baseline, but there has been no continuous or recent monitoring, for boron. There has been no monitoring of Outfall 001 discharges for Boron. Boron was detected in baseline upstream, downstream, and Mine No. 1 inflows, all at concentrations below the Numeric Standard. Thus boron Numeric Standards are likely not exceeded in North Thompson Creek. Chloride (Cl) Monitoring results suggest that the Numeric Standard for chloride is not exceeded in downstream flows. The Numeric Standard for chloride (Cl) is 250 mg/l. Chloride values from outfall 001 have ranged from 40.2 mg/l to 78.8 mg/l with an average of 55.9 mg/l. There are signs of slightly increased chloride values downstream of outfall 001. Sulfate (SO4) Monitoring results suggest that Outfall 001 discharges may have an effect on concentrations of sulfate in North Thompson Creek, but that downstream sulfate concentrations are below the Numeric Standard. The Numeric Standard for sulfate (SO4) is 250 mg/1. Sulfate values for outfall 001 have ranged from 236 mg/l to 420 mg/l, with an average of 307 mg/l. North Thompson Creek C-1981-025 Permit Renewal 05 12 May 2009 ,,25