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Technical Revision (TR 13 ) Request <br /> File M-77-378 <br /> Page 2 <br /> Proposed Reclamation Plan: <br /> - Regrade slopes by a combination o[ cut and fill. Slopes will <br /> range from 6 . 8 : 1 to 2 1/2 : 1 with 2 1/2 : 1 being the most <br /> predominate. <br /> - Pond surface will be graded at approximately a two percent <br /> grade towards the hillside. <br /> - Stabilization of the side-slopes and top is accomplished by <br /> placing a minimum of 1 foot of overburden material over the <br /> entire pond. <br /> - Revegetation is accomplished by a process of amendment , <br /> fertilization, seeding, maintenance and esta'Dlishment of <br /> secondary plant communities. <br /> - Earthwork is tentatively scheduled for 1992 . <br /> The following points should be considered when evaluating the two <br /> plans: <br /> - The factors of safety for slope failure will be increased by <br /> regrading the slopes. <br /> - The accepted plan has been tested on the flatter portion of <br /> the south slope of Tailings Pond #2 as part of test plot <br /> studies but it did not work on the steeper slopes. The <br /> steepest areas of the pond probably cannot be stabilized <br /> without slope reduction. <br /> - The proposed fill material to grade the top of the pond is to <br /> be coarse tailings material scalped Erom the tailings flow to <br /> the active tailings pond. Because the coarse material is a <br /> structural component of the active pond, this plan can not be <br /> implemented until the final stage of operation of the tailings <br /> facility. <br /> The Sunnyside Mine and Mayflower Mill is in a state of <br /> Temporary Cessation of operations and reclamation work cannot <br /> proceed on Tailings Pond #1 while the operation is inactive <br /> under the existing plan. <br />