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a� SIT <br /> Attachment LK <br /> Page LK-5 <br /> Permit No. CO-0044768 <br /> (8) Character of spent material. <br /> (9) Designed to operate with the simplest and least frequent operation and maintenance requirements. <br /> (10) Climate and access. <br /> Work Plan -- <br /> 19 <br /> (1) Evaluate baseline water quantity and quality at M-02,portals and other seeps. <br /> (2) Collect and bench scale test for passive bio treatment systems. <br /> (3) Open portals for evaluation of discharge conditions. <br /> (4) Determine quantity and quality to be treated by passive bio treatment system. <br /> (5) Examine surface subsidences for run on control. <br /> (6) Design run on control practices. <br /> (7) Design lined flow around ditches. <br /> (8) Design passive bio treatment system. <br /> (9) Investigate favorable location for onsite relocation of mine wastes. <br /> (10)Record historical buildings and artifacts that will be affected by this project. <br /> (11)Obtain permits,if needed,from San Juan County and Corps of Engineers. <br /> (12)Install downstream sedimentation controls to prevent pollution during reclamation <br /> (13)Start and complete as much of the onsite mine waste mitigation work as possible. <br /> 1997 and on <br /> (1) Implement BMP run on controls where practicable <br /> (2) Stabilize historical buildings that will remain on site <br /> (3) Continue relocation of mine wastes. <br /> (4) Dewater settling pond and remove sediments. <br /> (5) Submit a completed design for a passive bio treatment system to WQCD. <br /> (6) Construct flow around ditches. <br /> (7) Reclaim and revegetate waste areas using cap for areas where relocation is not possible. <br /> (8) At the completion of the studies and reclamation work, SGC will provide$200,000 to a fund as directed <br /> by WQCD, which funds will be utilized to fund water quality improvements of remedial projects to <br /> address impacts of past muting activities in the Upper Animas Basin. <br /> (9) Calculate loading reduction due to the waste removal/run on controls. <br /> Analysis <br /> The headwaters of North Mineral Creek currently have a low pH and are laden with heavy metals. Removal <br /> and consolidation of the mine dumps(including pH stabilisation)will isolate this material from direct contact with ram <br /> waters, snow melt and flows from intermittent streams and neutralize the acid generation process already in progress. <br /> These Best Management Practices will improve the conditions of the headwaters of Mineral Creek <br /> Should a passive bio treatment system be installed by another Party(which installation is not part of this project) <br /> it may provide an effective approach to treatment of long term acid mine drainage and may reduce the need for and <br /> expense of active chemical treatment and minimize sludge disposal requirements <br />