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h1r. Gilbert F. Rindahl August 12, 1981 Page -2- c. There should be certification by a professional engineer for all cyanide leaching facilities as. to design and construction. 2. Much more detail is also needed on the tailings disposal system to be used in connection with the mill. The following items should be addressed in detail: a. What is the difference between the "proposed tailings ponds" and the "proposed tailings areas"? If the ponds ~~ are to be a first stage with the tailings then moved [o the areas as the ponds are mucked out periodically, this process should be described in detail. b. The design, locations, placement specifications and field controls for the spent tailings should be described and illustrated. This would include, for example, acid drainage potential, liner thicknesses and compositions for tailings ponds and areas, heavy metal contamination, lift heights if tailings are mucked, degree of compaction or use of compaction proctors, use of containment berms, etc. gad c. How will the tailings be sampled (e.g. grab samples)and ~ Pt',•y for what constituents, prior to placement) 5°~ d. The tailings ponds should be described in detail. For a example, what backup systems have been instituted; what is rfceEi,~ls°~the reserve capacity of the ponds; to what storm are they r"~,<<°" designed; details of pond dam construction; etc. 2 e. There should be certification by a professional engineer for ail tailings disposal facilities as to design and construction. ~f. If the existing tailings ponds are to be used in the operation, their use should be described in detail. ~Jp E~1 ~~ 3. How will toxic materials be handled on site (e.g., security, storage, ~~r.'1`' fencing, dry storage methods, etc.)? 4. ty The actual 9 acres of affected land, including all facilities associated ~a~~-~~M with the operation, should be outlined on all maps. Adjacent land- owners should be shown. X5. All roads that are constructed or significantly improved and enlarged should be shown on the map, included in the affected land, and reclaimed. x6. All parts of the affected land with topsoil should have this topsoil stripped and stockpiled, with the stockpiles stabilized with an appropriate perennial grass cover crop for this altitude. The stock- piles should be protected from erosion, and the protective means should be described and illustrated. 7. All sediment control structures for protection of Gaines Gulch should i„~~~'Cµl, be shown on the map. The design and function of such structures should d be given in the text.