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Longfellow Koehler Project <br /> Page 7 <br /> (1) installation of a passive bio treatment system; <br /> (2) reduction of acidity in the headwaters by isolating or limiting abilities of waters to <br /> react with pyrite and other sulfide minerals; <br /> (3) reduction of exposure to waste material by snowmelt, rainwater and intermittent <br /> streams; and <br /> (4) visually reclaim area to accepted reclamation standards. <br /> SGC will be relieved from responsibility for Operation and Maintenance of the project, <br /> and will be released from permit liability at the end of the fourth anniversary of the consent decree. <br /> The operation and maintenance of this site will become the responsibility of other parties <br /> once these commitments have been met. <br /> Contingency Plans <br /> Should the concept of a passive bio treatment system not be practical after engineering <br /> studies, SGC will evaluate other passive treatment systems. If another system can be more effective <br /> and cost efficient, SGC will advise the Water Quality Control Division prior to installation. <br /> Prior to draining of the pond,the pH will be raised to minimize the metal content of the pond <br /> water. <br /> Downstream sediment catchments will be installed to minimize downstream effects during <br /> remediation. <br /> If a favorable onsite location cannot be found for onsite relocation of mine wastes the mine <br /> wastes will be trucked to SGC's Tailings Pond#4 at the Mayflower Mill. Under SGC's MLR permit <br /> (M-77-378)this material can be consolidated into Tailings Pond #4. <br />