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<br />1 <br />r <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />Prediction of the post mining hydrologic conditions was <br />based on calculations of the time necessary to flood the Orchard <br />Valley mine and on information obtained from the flooded Farmer's <br />mine. It was estimated that natural flooding after mine <br />abandonment would be very slow. However, the mine flooding, or <br />flooding of particular mine sectors, could be accelerated by <br />using other water resources available to CWI (from the Stevens <br />Gulch well field) or by selective flooding of certain mine <br />sectors. <br />It is believed that during the Orchard Valley mine life <br />under the current permit to mine, no water will be discharged out <br />of the mine. <br />Water quality in the flooded mine will be similar to the <br />quality of water flowing into the mine. Over a long period of <br />time it is assumed that water in the flooded mine will have a <br />slight increase in sulfate concentrations and in total dissolved <br />solids. <br />,e ,r • <br />May 31, 1985 <br />~~~ ~~, ~..i ~ l,t.,,o~ <br />Vladimir Straskraba <br />Principal Hydrologist <br />14 inuen cF:~~ ci~~si cnvr, <br />