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4.0 PROTOCOL FOR PLACEMENT OF TRACER <br /> 4. 1 Introduction <br /> The following procedure is intended to provide general guidelines for performing the <br /> tracer work that is proposed for the Sunnyside Mine. The procedure is divided into <br /> five sections: (1 ) background assessment, (2) tracer inoculation, (3) monitoring after <br /> placement of bulkheads, (4) sample collection protocol, and (5) sample analysis. The <br /> procedures, wherever possible, are written in observance of the difficult logistical <br /> problems associated with travel in and around the mine through parts of the year. <br /> 4.2 Background Assessment <br /> Selected springs, creeks, and mine tunnel discharges will be monitored for bromide <br /> content before the proposed portals are installed. The objective of the background <br /> assessment is to learn the maximum range of the natural variability of bromide in the <br /> vicinity of the mine. It is critically important to know this information to confidently <br /> assess when changes in concentration of bromide at the sample locations represent <br /> seepage from the mine rather than natural variation in background concentration. The <br /> better the background is defined, the greater the sensitivity of the test. Only samples <br /> collected before the tracer is brought to the site can unequivocally be assumed to <br /> represent the true background. After the tracer is at the site a large variety of factors <br /> can result in low levels contamination in the water samples. Accordingly, the most <br /> su11ny\wp\traci\2251\Workp1an 693 8 <br /> N0 simon HYDRO-SEARCH <br />