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<br /> <br /> <br />To insure that flood waters are not impacted by the ore stockpile at <br />the ore sorter, Cotter has implemented operating procedures to insure that no <br />ore will be stored closer than 70 feet from the boundary of the 100 year flood <br />plain. <br />2.2.3 Surface Water Quality <br />A series of tests applicable to Ralston Creek has been completed by <br />Cotter for the purpose of identifying any source which may contribute to the <br />elevated Ra-226 or uranium concentrations. The results are summarized below. <br />A. Ralston Creek Flow Data <br />The contribution of mine water flow to the total flow of Ralston Creek <br />• was between 23% - 29% for the years 1976 through 1978. Although this is a <br /> yearly average, monthly flows varied depending on runoff. The variability in <br />flow can have significant effect on various chemical constituents. <br />B. Trace Metal Analysis <br />Five areas of passible contamination were monitored. <br />1. Ralston Creek at the Long Lake headgate. <br />2. Raw and treated mine water at the Schwartzwalder mime. <br />3. Bottom sediments from Ralston Reservoir. <br />4. Survey of upper Ralston Creek drainage basin. <br />5. Ralston Creek during runoff event. <br />The Ralston Creek Valley upstream from the Schwartzwalder mine is host <br />to a number of mineral occurrences including uranium minerals, base metal <br />sulfides, and their oxidized derivatives. <br /> <br />2-10 <br />