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<br />• • <br />Bruce Humphr_. - 2 - I :~, .._ <br />i <br />borderline between SM and SC classifications, and that SM type soil;may have <br />permeabilities as high as 5 x 10_q cm/sec, which is the value supplhed by <br />SRK. <br />If Battle Mountain Gold has not performed any more sophisticated pe meability <br />tests on the type 2 material, these tests should be required. If a propriate <br />permeability studies have been performed, the results need to be su plied to <br />the Division for review. I would recommend "falling head" type per eability <br />tests be performed on the drain layer material, both in the field, end in a <br />lab, and with sufficient frequency to determine an accurate permeao~lity for <br />the material. <br />ACS/yob <br />Enclosure(s) <br />cc: Jim Pendleton <br />Harry Posey <br />Jim Stevens <br />Larry Oehler <br />2807E <br />