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3.0 TRACER TEST RA T/ONALE <br /> The purpose of the tracer test is to "label" waters which have passed through the <br /> Sunnyside Mine so that such waters can be identified if they discharge to the surface <br /> via springs, seeps, or from mine portals. <br /> Bromide was selected as the tracer because: <br /> background ground-water concentrations of bromide have been <br /> measured at less than 0.01 ppm allowing for low concentrations of the <br /> tracer to be used; <br /> bromide is conservative (i.e., not significantly affected by precipitation, <br /> adsorption, absorption, or biological activity); <br /> laboratory analytical techniques can reasonably detect bromide to 0.01 <br /> ppm using an ion chromatographic technique (see Section 4.5); and <br /> Bromide is not a regulated ground-water constituent and is considered <br /> benign at the proposed concentrations of tracer in the mine water. <br /> The quantity of bromide in solution is intended to be at least 25 times the measured <br /> natural background levels of bromide. This concentration will allow for detection of <br /> the bromide even if there is significant dilution between the mine workings and the <br /> surface. However, the average concentration of bromide in waters impounded in the <br /> mine will be approximately one part per million (although local concentrations will be <br /> higher). <br /> sunny\wp\traci\2251\Workplan 693 6 <br /> NNl simon HYDRO-SEARCH <br />