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<br /> 12 <br />' <br />' 1 This liner, as proposed, does not <br /> 2 include that. It's a single-layer synthetic <br />' 3 b <br />t <br />d <br />b <br />' <br /> mem <br />rane over a compac <br />e <br />earth <br />ase. 4 <br />he <br />' 4 single-layer synthetic membranes virtually all leak <br /> 5 at some point or another. Whether the leak is large <br /> 6 enough and acute enough to be a health hazard is <br /> 7 something which I think we need assistance to <br /> e monitor and to guard against, so if it does become a <br /> 9 health hazard, by which I mean a groundwater hazard, <br /> to th <br /> at we can take steps to control it. <br /> 11 Staff inquired into leak detection <br /> 12 underneath the tailings deposition on the responses <br />' 13 on the adequacy and were told, I think correctly, <br /> 14 that placing individual detection points underneath <br />' 15 the tailings would be probably ineffective, that the <br /> <br /> 16 plume coming down from any given leak woaild be <br /> 17 sufficiently unlikely to intercept detection points, <br /> 18 that it would probably not be a useful exercise. <br /> 19 In that case, the only real Forotection <br />' 20 that we could look for is a double liner with what's <br /> 21 called a drainage netting in between -- i.t's fairly <br /> d l <br />k d <br />t <br />ti <br />i <br />t <br />d <br />i <br />th <br />b <br />i <br />-- <br /> 22 ness <br />an <br />ea <br />e <br />ec <br />on <br />n <br />an <br />ard <br />e <br />us <br />s <br />n <br /> 23 the layer between the two synthetic linens. <br /> 24 The backup that we have in the project, <br /> 25 as proposed, is this compacted soil. These are <br />r AGREN, BLANDO & BILLINGS <br /> <br />