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<br />Review of Abatement #'8 Response <br />August 4, 1993 <br />Page 7 <br />SUMMARY: <br />The interstitial (liquid) component of the tailings that were depc~eited before <br />cytox was applied have not been adequately sampled. <br />The logical premises for leaching the tailings with simulated rainwater rather <br />than rainwater plus sulfuric acid needs to be explained. seuming the <br />explanation ie satisfactory, I see no reason for further leach to te. <br />The acid/base accounting testa show a net positive acid production p~tential over <br />acid neutralization potential. Whether this will produce a high ate of acid <br />production under the environment that will prevail following closurl needs to be <br />explained. <br />The accelerated weathering testa produced a few metals concentrati ne exceeding <br />surface water standards for the Rio Grande River. These result need to be <br />explained in context of the environment that will prevail following losure. The <br />Division needs certain assurance that surface water which will f ow over the <br />tailings following closure will not produce surface or groundwate that cannot <br />meet surface and groundwater standards. <br />cc: Mike Long <br />Jim Pendleton <br />Bruce Humphries <br />Jim Stevens <br />M:\MIN\HHP\BMGAEW .MEM <br />