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1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br />64 <br />1 description of what is actually handled in the <br />2 impoundment here, it's best, I think, to talk about <br />3 what our liner or containment system is. We did a <br />4 very extensive evaluation of what the subsoil and <br />5 substrate materials are on the property. <br />6 We have done material testing in terms <br />7 of what is the permeability of the materials and <br />8 what the permeabilities that are available by <br />9 reworking those materials on the site. <br />l0 The drainage system should be considered <br />11 as involving the tailings themselves. The tailings, <br />12 as Anne said, have the ability to reduce the <br />13 permeability following deposition. From all our <br />14 test programs, we believe that the permeability of <br />15 the material which is in direct contact with the <br />16 drainage member will be as low as l0 to the minus <br />17 6 centimeters per second. It will be equivalent to <br />18 1 foot per year. <br />19 So the tailings is in contact with the <br />20 drainage member itself and there are 3 feet of that <br />21 material where the drainage network within it is to <br />22 the entire line system. <br />23 You can't ignore the tailings as having <br />24 a very positive proponent in reducing the potential <br />25 solution migration out of the base of that tailings <br />AGREN, BLANDO & BILLINGS <br />