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is by no means exhaustive. The wide use of bromide as a ground-water tracer <br /> demonstrates that its use is accepted practice. <br /> 5.0 LACK OF DENSITY SETTLING <br /> Density settling will not be a problem if bromide is introduced into the mine workings <br /> as proposed (Simon Hydro-Search, Inc. and Tracer Research Corporation, 1993). The <br /> average proposed concentration of bromide in the mine workings is 1 part per million <br /> (ppm). Davis et al. (1980) state that density settling will not be a problem with <br /> chloride if it is introduced in concentrations of less than 3000 ppm of Cl-. Due to the <br /> heavier atomic weight of bromide, the corresponding value of bromide would be 1300 <br /> ppm of Br- (which is 1700 ppm of NaBr). The proposed method of bromide <br /> innoculation will not result in concentrations approaching this value. <br /> 6.0 BROMIDE WILL DISSOL VE IN MINE WA TERS <br /> Based upon well established solubilities, the introduced bromide tracer will rapidly <br /> dissolve as water levels rise behind the bulkheads in the Sunnyside Mine. <br /> The bromide tracer will be introduced into the mine in a manner which distributes the <br /> bromide throughout the mine workings and will not result in an anomalously high <br /> concentration in any one area (Simon Hydro-Search, Inc. and Tracer Research <br /> Corporation, 1993). The average concentration of dissolved bromide will be <br /> approximately one milligram per liter. <br /> I:\ADMIN\WP\DIANE\BROMIDE.RPT 4 <br /> N11 HYDRD-SEARCHAC. A Tetra Tech Company <br />