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1.0 INTRODUCTION <br /> This work plan presents a rationale and methodology for a tracer test at the Sunnyside <br /> Mine near Silverton, Colorado. The purpose of this tracer test is to determine if, and <br /> where, waters impounded behind underground bulkheads migrate to the surface. This <br /> work plan was developed in response to a request by the Colorado Mined Lands <br /> Division. This work plan applies a proven ground-water tracing methodology to the <br /> proposed underground water impoundment. <br /> sunny\wn\iraci\2251\Wo•kplan.693 <br /> N:l simo 1 HYDRO-SEARCH <br />