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1.0 EXECUTIVE SUMMARY <br /> In September 1993 a work plan was submitted for applying a proven ground-water <br /> tracing methodology to a proposed underground water impoundment at the Sunnyside <br /> Mine located in San Juan County, Colorado (Simon Hydro-Search, Inc. and Tracer <br /> Research Corporation, 1993). The work plan specified the use of bromide as a <br /> ground-water tracer. This report provides details of the suitability of the use of <br /> bromide as a tracer which include: <br /> • The use of bromide is accepted practice for ground-water tracing, <br /> • bromide is stable, (it does not break down or change into something <br /> else), <br /> • bromide is not removed by absorption or adsorption by clays or other <br /> geologic materials, <br /> • bromide will not be attenuated nor slowed down by ion exchange, <br /> • bromide will not be affected by biological activity, <br /> • bromide will not be precipitated, and <br /> • bromide, if introduced as recommended in the work plan, will not be <br /> affected by density settling. <br /> In consideration of the above characteristics the use of bromide as a ground-water <br /> tracer is considered a reliable means of establishing whether water which reaches the <br /> surface has passed through the underground workings of the Sunnyside Mine. <br /> 1:\ADMIN\WP\DIAN E\BRO MID E.RPT 1 <br /> NOR HYDRO-SEARCH,I G A Tetra Tech Company <br />