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L • <br />Memo to Berhan Keffelew <br />Cresson Mine Spec Changes <br />page 2 <br /> <br />(the drainage valley that extends from the crest between the <br />Wilson Creek drainage and Arequa Gulch from the vicinity of <br />the haul road to the soil stockpile as the road crosses that <br />hill crest). <br />The proposal, field approved by Golder Associates pending <br />concurrence by the Office of MLR, accepted the same poorly <br />sorted 3/4-inch to 3/8-inch granular material for use in <br />backfilling the secondary underdrain. The compressive <br />strength of this material will be roughly equivalent to the <br />originally specified material and the permeability of the <br />poorly sorted material will exceed that of the well sorted <br />originally specified product. <br />cc: Bruce Humphries <br />Al Sorenson <br />Jim Dillie <br />Doc: M:\MIN\CRESSON\BEDAPPR.WPS <br />JP/JP <br />