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the ground-water flow system reaches equilibrium. Thus, it is probable that these <br /> waters will be the first waters from the flooded workings to reach Cement Creek. <br /> A major focus of the test protocol is to ensure that concentrations of the tracer are <br /> approximately uniform in key areas of the flooded workings. Too low a tracer <br /> concentration in mine waters could result in mine waters that escape detection when <br /> mixed with the local ground-water regime. Alternatively, too high a concentration <br /> could result density settling of the tracer solution in the mine, thus potentially <br /> interfering with the ability of the tracer solution to exit the mine workings. <br /> The required amount of sodium bromide for each 100 foot elevation interval is <br /> attached (Table 1 ). The table is based on a 1 ppm mine water concentration. The <br /> bromide concentration will be somewhat greater than 1 ppm in the areas where <br /> bromide tracer has been sprayed on mine walls. However, sufficient tracer will be <br /> sprayed on mine walls to allow the total average concentration of bromide in the <br /> flooded workings to be 1 ppm. Hence, the concentration of bromide in the area of <br /> inoculation will be at least 1 ppm even if significant convection currents develop <br /> within the mine. <br /> It may also be useful to distribute the tracer throughout the American Tunnel. This <br /> can be accomplished most easily before the tunnel is blocked by spraying the walls. <br /> The spraying will result in release of tracer into the water flowing out of the tunnel. <br /> sunny\wp\traci\2251\Workplan.693 1 1 <br /> Hal simon HYDRO-SEARCH <br />