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July 1999 Monthly Report <br /> Page 2 <br /> Sunnyside submitted completion certifications in October, 1997. <br /> Included with this report are monitoring results from the Gold Prince and <br /> Longfellow/Koehler projects. <br /> • Sunnyside Mine Pool Mitigation—Alkaline Solution Injection <br /> This project was not active in July of 1999 although 0.41 Mgallons of stormwater were <br /> pumped through the Terry Tunnel bulkhead to lower the water level in the Terry Tunnel <br /> settling ponds in order to maintain a no discharge status. This was necessary due to <br /> inflows from a continuous storm pattern in July with little evaporation occuring. <br /> Evaporation and infiltration are normally enough for pond level control. <br /> The results from the bulkhead sample taken in June are included with this report. <br /> The water pool pH, at the American Tunnel bulkhead, was 5.09 and the bulkhead gage <br /> read 398 psi at the end of July. This would indicate that a rise in the mine pool occurred <br /> since the end of June (7 feet). Sunnyside will continue to monitor these parameters. <br /> "B List" Projects <br /> • Columbus Mine Portals—Mine Waste Dumps <br /> • London Mine Portals—Waste Dumps <br /> Work, permitting or arrangement for access are not planned until it becomes evident that <br /> the work plans for these projects require implementation. <br /> • Mayflower Facility—Upland Hydrological Control <br /> Most of July was spent constructing access roads, defining water courses and finding <br /> locations along these water courses for capture and diversion structures in Drainages A <br /> and B. Even though significant construction time was lost due to storms, diversion points <br /> were defined in both drainages and the interception structure for drainage A was poured <br /> by month end. Significant sub-surface stormwater runoff flows were found in both <br /> drainages. <br />