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<br />TABLE 3 <br />EPA METHOD 1312 TEST RESULTS <br />INCO SOt/AIR TREATED TAILINGS' <br />Parameter ExVad Concentration <br />(m9/9 <br />Arsenic <0.05 <br />Barium <0.01 <br />Cadmium <0.005 <br />Chromium <0.01 <br />Copper <0.01 <br />Iron 0.10 <br />Lead <0.05 <br />Mercury <0.003 <br />Manganese <0.01 <br />Selenium <0.1 <br />Silver <0.01 <br />Zinc <0.01 <br />' Source: Core Laboratories, t992. <br />continuous basis. In addkion, the operators will routinely sample the tailings slurry and analyze k <br />for WAD cyanide. <br />Monkoring of the tailings slurry prior to and fdlowing INCO SOZ/Air treatment as wek as the liquid <br />pods in the impoundment and sdution in the seepage collection pond will continue as required by <br />the MLRD at the time the INCO SOZ/Air process commences operation. All samples will be <br />colected, handled, and analyzed as set forth in Quality Assurance/Quality Control Protocols for the <br />Collection of SuAace and Ground Water Quality Data San Luis Gold Pr%ect Costilla County, <br />Colorado (John C. Halepaska and Associates, Inc., 1992). In addkion, tailings slurry samples will <br />continue to be collected and subjected to humidity cell tests on a quarterly basis. As discussed <br />previously, BMR has agreed to develop and implement a program, 'rf necessary, to mkigate potential <br />acid generating characteristics of the tailings slurry. However, based on humidity cell test data <br />available to date, k does not appear that mkigatlon will be necessary. <br />25301/RN0610.RPT INCO SO2/Air Technical Revision Page 11 <br />Juns 16, 1992 San Luis Mine <br />