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October 1999 Monthly Report <br /> Page 2 <br /> Sunnyside submitted completion certifications in October, 1997. <br /> Included with this report are monitoring results from samples taken at the Gold Prince <br /> and Longfellow/Koehler project sites in September. <br /> • Sunnyside Mine Pool Mitigation—Alkaline Solution Injection <br /> This project was not active in October of 1999 although 0.19 Mgallons were pumped <br /> through the Terry Tunnel bulkhead to lower the water level in the Terry Tunnel settling <br /> ponds in order to maintain a no discharge status. This was necessary due to inflows from <br /> a continuous storm pattern throughout the summer months with little evaporation <br /> occurring. Evaporation and infiltration are normally enough for pond level control. <br /> The water pool pH, at the American Tunnel bulkhead, was 4.84 and the bulkhead gage <br /> read 419 psi at the end of October. This would indicate that a rise in the mine pool <br /> occurred since the end of September(9 feet). Sunnyside will continue to monitor these <br /> parameters. <br /> The Terry Tunnel bulkhead was inspected on October 20,1999. The pressure gage read <br /> 22 psi, which agrees with The American Tunnel gage (within the accuracy of the gages). <br /> The pH of the water behind the Terry bulkhead was 11.95. This high result is most likely <br /> the result of stirring up lime behind the bulkhead while pumping to maintain a no <br /> discharge status from the Terry Tunnel settling ponds. During this inspection, the <br /> bulkhead valve was closed in anticipation that additional pumping, to maintain a no <br /> discharge status, would not be required for the remainder of 1999. <br /> "B List" Projects <br /> • Columbus Mine Portals— Mine Waste Dumps <br /> • London Mine Portals—Waste Dumps <br /> Work, permitting or arrangement for access is not planned until it becomes evident that <br /> the work plans for these projects require implementation. <br />