Laserfiche WebLink
•- <br />~ • <br />• <br />John Hardaway -3- April 13, 1995 <br />available oxygen ~or deeper inf:ltration~ 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 waste 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 the ~CC & VG is presently mining and compiling ore and wazte rock, the <br />Division recommends that whatever protective measures design work needs to be done and <br />be completed az soon az possible. We remind you that the Cresson ores and waste with <br />which we are familiar have a poor ability to produce low permeabilities. We caution that <br />the old pits should be filled quickly and not partially; leaving the pits patt-filled with mine <br />waste could generate enough acid to release sufficient quantities of ferric iron to in essence <br />become acid self-generating. Whether this should be figured into the bond is something <br />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 />(~ ~ ~ ~ <br />Berhan Keffelew <br />Environmental Protection Specialist <br />cc: Bruce Humphries, DMG <br />Mike Long, DMG <br />James Komadina, CC & VG <br />M:\OSS1ammL1M116.bk <br />