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- 6 - <br /> c. It is likely that long term seepage of tailings leachate into the <br /> local ground water will occur. How has AMAX addressed this n <br /> concern? Also, the relationship between ground water and surface <br /> water, particularly in the Ten Mile drainage is probably not <br /> adequately characterized in the original permit. Such <br /> information will be important relative to long term tailings <br /> stability and long term leachate production. <br /> d. It is also probable that regardless of the final type of <br /> reclamation implemented, long term water quality monitoring and <br /> water treatment will be necessary. How does AMAX plan to <br /> accommodate this issue? <br /> e. File documents indicate that industrial spills have occurred, <br /> possibly in the Eagle River drainage. How did these situations <br /> occur, and how is AMAX preventing future such occurrences? <br /> f. How is sludge from the water treatment plant discarded? Also, <br /> provide a detailed characterization of the sludge material . <br /> Open Pit Area <br /> 1 . What will be the beneficial end use for the open pit area? <br /> 2. The existing reclamation plan for the open pit area does not involve <br /> much active reclamation. Rather, reclamation of the pit area relies <br /> upon natural weathering and erosion processes. These factors will <br /> aid the reclamation process; however, quarry reclamation methods have <br /> progressed considerably since 1977. Blasting techniques, chemical <br /> applications (to accelerate weathering processes) and some <br /> revegetation may be possible on bench or ledge areas given a creative <br /> approach to the revised reclamation plan. The amendment should <br /> re-examine the open pit reclamation plan and perhaps we can develop a <br /> more technologically advanced program. <br /> 3. Subsidence processes may have a significant impact on any plan to <br /> reclaim the open pit area. The amended plan should attempt to <br /> project the magnitude of future subsidence. How will subsidence of <br /> existing workings affect the long term surface configuration in the <br /> pit area? <br /> 4. The existing reclamation plan indicates that the open pit area will <br /> become a lake. It is further indicated that ground water degradation <br /> will not occur as a result of this lake. How will the development of <br /> such a lake increase local seepage rates and is it correct to assert <br /> that no water quality degradation will occur? Will the lake become <br /> acidic? <br /> How does the quality of water presently retained in the pit area <br /> compare to background water quality? <br />