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Memo to Wally Erickson 2 March 14, 2001 <br /> resolution. Sunnyside Gold has already committed to the submittal of such a report in the TR-025 <br /> application. <br /> • Equilibration of hydrostatic pressure behind the bulkhead and a level that does not exceed design <br /> criteria. <br /> • Demonstration that the chemistry of the impounded water, e.g. sulfate concentration and pH, will <br /> not degrade the bulkhead concrete. <br /> • Demonstration that the effectiveness of the bulkhead seal and low-pressure grouting has been <br /> maximized in terms of leakage limitation. <br /> Once acceptable performance of American Tunnel Bulkhead No. 2 has been demonstrated and accepted <br /> by the Division of Minerals and Geology, American Tunnel Bulkhead No. 3 may be installed. <br /> American Tunnel Bulkhead No. 3 will be provided with a sampling port that will allow measurement of <br /> hydrostatic pressure behind the bulkhead and will allow samples of the impounded water to be collected <br /> for analysis. <br /> cAwindowApersonahsunnyside tr25.doc <br />