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October 1999 Monthly Report <br /> Page 3 <br /> • Mayflower Facility—Upland Hydrological Control <br /> During October, final grading, disturbance reclamation and seeding of the project area <br /> were completed. The site was inspected on October 19,1999 by DMG. DMG's inspection <br /> report dated November 11, 1999 confirms completion of the project according to the <br /> work plan and performance requirements of the Colorado Mined Land Reclamation Act. <br /> • Tailings Pond No. 4 Surface Drainage Modification <br /> The work plan for this project was under construction at month-end. Configuration of the <br /> toe drainage ditch had been completed using fill material to form the ditch dimensions for <br /> the liner. Approximately 800 feet of liner material had been placed by month-end. Project <br /> completion is anticipated to occur in early November 1999. <br /> • Tailings Pond No. 4 Upland Groundwater Diversion <br /> Sunnyside had been holding discussions with BLM to implement this project in exchange <br /> for an area to place material from their Lackawanna mill tailings remediation project. <br /> Since no contact has occurred since August to move the project forward, Sunnyside <br /> started moving stockpiled overburden material to prepare the site for the project and will <br /> complete as much of the project as possible before the weather changes. By excavating <br /> exploratory holes to determine potential depths and paths for the groundwater diversion <br /> structure, Sunnyside has located a thick (>15' in places) relatively impermeable clay <br /> seam that groundwater appears to follow (on top). It appears feasible that Sunnyside will <br /> be able to capture this groundwater flow and divert it around the tailings with a lined <br /> surface ditch after overburden material is removed. If weather permits, Sunnyside will <br /> complete this diversion ditch in 1999. <br /> It does not appear feasible to reach foundation rock along the entire length of the project <br /> area as originally envisioned. The clay seam appears to follow the bedrock and it is likely <br /> that any groundwater movement is on top of the clay seam. Interception at this point is <br /> feasible and will be an improvement over the existing conditions if not equivalent to a <br /> diversion structure on bedrock. Sunnyside plans to proceed with construction, modifying <br /> the concept to divert flows traveling along the clay-overburden contact. <br /> Cement Creek Diversion and Water Treatment <br /> Following notice, Cement Creek diversion and water treatment was suspended on June 1, <br /> 1999. Monitoring results through September had not revealed a reason to resume <br /> treatment. Sunnyside continued to evaluate whether resumption of Cement Creek <br /> diversion and treatment should occur through October. Due to unusual precipitation <br /> conditions that Sunnyside has observed in Cement Creek this summer and fall, Sunnyside <br />