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pH Trend <br />There was a significant increase in pH over time in the Wild Irishman mine-waste leachate. pH <br />rose from pH 5.5 after 5 minutes to pH 6.6 after 18 hours. (+1.1 pH units). This indicates net-acid <br />neutralization in the leachate over time. <br />Specific Conductance Trend <br />The leachate had low specific conductance with measurements of 33.5 µS/cm after 5 minutes, <br />rising to 113 µS/cm after 18 hours. <br />Sulfate <br />The sulfate concentration was low with concentrations of 13 mg/L after 5 minutes and 30 mg/L <br />after 18 hours. <br />Selected Major-Element Trends <br />Wild Irishman leachate had low calcium concentration that ranged from 2.8 mg/L in the 5-minute <br />leach to 12.4 mg/L after 18 hours. <br />Selected Trace-Metal Trends <br />Following are summaries of selected trace-element trends portrayed in the time study (5-minute <br />vs. 18-hour) of the Wild Irishman mine-waste leachate. <br />Aluminum (AI).-This leachate had aluminum concentration that ranged from 20.1 µg/L in the <br />5-minute leachate and decreased to 2.6 µg/L after 18 hours. There was a net aluminum loss in <br />the leachate over time. <br />Cadmium (Cd).-Minor concentration of cadmium was found in the leachate with values of <br />0.16 µg/L after 5 minutes, increasing to 0.43 pg/L after 18 hours. <br />Copper (Cu). Minor leachate copper concentration was found and the concentration <br />increased slightly over time. Values ranged from 0.50 µg/L in the 5-minute leachate to 0.55 <br />µg/L after 18 hours. <br />Iron (Fe).-No iron was found in the Wild Irishman leachate at the ICP-MS detection limit. <br />Both the 5-minute and 18-hour leachates were <50 µg/L. <br />Manganese (Mn).-Moderate concentration of manganese was found in the leachate. The 5- <br />minute concentration was 281 µg/L and increased to 661 µg/L after 18 hours. <br />Mercury (Hg).-Mercury was not detected in the Wild Irishman leachate. <br />Nickel (Ni).-Nickel was found in the leachate with a 5-minute concentration of 0.60 µg/L, <br />increasing to 1.0 µg/L after 18 hours. <br />Lead (Ph).-Low concentration of lead was found and lead concentration decreased over time <br />from 2.6 pg/L after 5 minutes to 1.3 µg/L after 18 hours. <br />Zinc (Zn).-Moderate concentration of zinc was found in the Wild Irishman leachate, and the <br />zinc concentration increased over time. 5-minute concentration was 6.0 gg/L, increasing to <br />43.8 µg/L after 18 hours. <br />Hageman_SIR_2508.doc 22 7/21/20042:50 PM