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t <br /> tributaries between. Dilution of seepage along such a route should be very adequate to dilute any high <br /> sodium seep water. <br /> In light of the SGC consultants report (M. Logsdon report) which recommends a mine pool pH of 8.5 <br /> or less, the target pH of the reservoir of 9-10 seems high. However, Mr. Perino indicated that <br /> Sunnyside's experience with water treatment shows that Zn precipitates most effectively above a pH <br /> of 9.4. Thus, the target pH of 9-10 is understandable. <br /> The target pH of the alkaline injection solution of 12 seems unachieveable if lime is used. However, <br /> as the company intends to overdose the solution with lime, and assuming that good mixing will occur, <br /> the excess lime should dissolve, and the target pH of the mixture should be achieved. <br /> I am still awaiting a return call regarding the potential solubility of some of the metals, but favor <br /> approving the application without comment. The addition of alkaline fluid to the mine pool can only <br /> help neutralize the acid waters as long as good mixing occurs. If I learn anything that would affect <br /> my interpretation, I will forward that to you. <br /> cc: Bruce Hunphries <br /> Wally Erickson <br /> C:\SGCTR-19.REV <br /> 2 <br />