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April 1999 Monthly Report <br /> Page 2 <br /> • Sunnyside Mine Pool Mitigation—Alkaline Solution Injection <br /> This project was not active in April of 1999. The water pool pH, at the American Tunnel <br /> bulkhead, was 4.43 and the bulkhead pressure was 372 psi at the end of April, a change <br /> of+1 psi since the end of March. <br /> Sunnyside will continue to monitor these parameters to determine if the pool is <br /> approaching physical equilibrium. <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 /> • Mayflower Facility— Upland Hydrological Control <br /> • Tailings Pond No. 4 Surface Drainage Modification <br /> • Tailings Pond No. 4 Upland Groundwater Diversion <br /> There was no activity on these projects during April 1999 due to snow cover. It is <br /> planned to resume work on these projects in the spring of 1999. <br /> Cement Creek Diversion and Water Treatment <br /> Cement Creek diversion and water treatment was active continuously throughout April <br /> 1999. The flow of Cement Creek was below the treatment system's capacity and the <br /> entire flow (500 G.P.M. to 889 G.P.M.)was diverted for treatment. <br /> The April 1999 monitoring results for; dissolved metals in the AT-004 discharge; Cement <br /> Creek diverted for treatment (CC-1B); American Tunnel flow before treatment (AT- <br /> INFEL); and Cement Creek below the AT-004 discharge point (cc-20) are attached to <br /> this report. <br />