Laserfiche WebLink
May 1999 Monthly Report <br /> Page 2 <br /> Sunnyside submitted completion certifications in October, 1997. <br /> • Sunnyside Mine Pool Mitigation—Alkaline Solution Injection <br /> This project was not active in May of 1999. The water pool pH, at the American Tunnel <br /> bulkhead, was 4.40 and the bulkhead pressure was 375 psi at the end of May, a change of <br /> +3 psi since the end of April. <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 May 1999 due to snow cover. It is <br /> planned to resume work on these projects in June of 1999. <br /> Cement Creek Diversion and Water Treatment <br /> Cement Creek diversion and water treatment was active continuously throughout May <br /> 1999. The flow of Cement Creek was below the treatment system's capacity and the <br /> entire flow (368 G.P.M. to 861 G.P.M.) was diverted for treatment. <br /> Notification was provided, according to the terms of the Consent Decree, of Sunnyside's <br /> intention to suspend diversion and treatment of Cement Creek on June 1, 1999. <br /> Treatment of the discharge from the American Tunnel will continue. <br />