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`. <br /> <br />John Hardaway -3- April 13, 1995 <br />through the overburden material and when that soil is relatively saturated at depth, the <br />available oxygen (for deeper infiltration) will be reduced This was agreed to during the <br />introductory meeting held to discuss the submission at the Division. ". <br />If capping is chosen to be the protective measure that will employed, the Division <br />recommends generally, that the cap be a composite cap, that it be adequately protective <br />both of the wazte and of the topsoil, that it be sized in consideration of the local <br />environment (temperature, precipitation, and topography). Upland diversion, bactericides, <br />and alkaline amendments are measures that should be considered for the overall system. <br />Knowing that CC & VG is presently mining and compiling ore and waste rock, the <br />Division recommends that whatever protective meazures, design work that needs to be <br />done, must be completed az soon az possible. We remind you that the Cresson ores and <br />waste with which we are familiar have a poor ability to produce low permeabilities. We <br />caution that the old pits should be filled quickly and not partially; leaving the pits part- <br />filled with mine waste could generate enough acid to release sufficient quantities of ferric <br />iron to in essence become acid self-generating. Whether this should be figured into the <br />bond is something the Division is willing to discuss further. <br />Please provide your response with the appropriate financial warranty calculations within 60 <br />days of the receipt of this letter. <br />If you have additional question or concerns please contact me. <br />Sincerely, <br />~=~~~J" <br />Berhan Keffelew <br />Environmental Protection Specialist <br />cc: Bruce Humphries, DMG / <br />Mike Long, DMG <br />Harry Posey, DMG <br />James Komadina, CC & VG <br />M:\OSS\am,,,\nbtO6.bk <br />