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TAILINGS POND #1 <br /> File No. M-77-378 <br /> RECLAMATION PLAN: <br /> The ultimate goal of the reclamation plan for Tailings Pond #1 is <br /> to increase site geotechnical stability to acceptable levels, <br /> eliminate migration of tailings from surface erosion by wind and <br /> water and establish a self sustaining vegetative cover on the pond. <br /> The plan incorporates five steps to achieve this. <br /> I . Resloping Sides of Pond <br /> The side-slopes of the pond will be reconfigured to slopes <br /> ranging from approximately 2 . 5 : 1 to approximately 6 . 8 : 1 with <br /> the 2 . 5 : 1 slope being the most predominant. The selection of <br /> slopes will be based on a geotechnical study of the pond by <br /> Western Technologies, Inc. in 1991 . Slope reduction will be <br /> accomplished either by cutting or filling various sections. <br /> The slope encroaching on Hwy 110 will be moved back to give an <br /> approximate 20 foot clearance between the pond and the highway <br /> to give drainage ditch area for the highway and to protect Lh� <br /> toe of the pond from gouging by heavy equipment maintairiir,jr <br /> the road. <br /> II . Regrading Top of Pond: <br /> The top of the pond will be sLopcE(3 ,.(- o-O,note drainage towards <br /> the hillside and eliminate ponding of snowmelt and runoff <br /> waters . An approximate 2% grade toward the hillside will be <br /> the construction goal although depending on fill volume <br /> available, several bench levels or steps might be required. <br /> These benches or steps , if required, will have 2 . 5 : 1 or less <br /> slope connections. The material for filling the interior pone <br /> area will be made up of material generated by flattening tfi�_, <br /> side-slopes and any other material from the Sunnyside Mine <br /> property approved by the Division (in the past or future) for <br /> consolidation into the pond prior to reclamation . <br /> III . Overburden Covering: <br /> The entire pond area (approximately 27 acres) will be covered <br /> with a layer of overburden. This layer will be a minimum of <br /> 12 inches thick but will range in thickness from 12 inches to <br /> 18 inches because, given the nature of the material , in order <br /> to place a minimum of 12 inches the average thickness will <br /> exceed this minimum. <br /> The overburden will be borrowed from the designated borrow <br /> northeast of Tailings Pond #4 . This area was approved as a <br /> borrow source in TR11 and borders areas previously approved in <br /> the Consolidated Permit and TR09. <br />