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• • iii iuiiiiiniiiiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Nalu rat Resources <br />13U Sherman St., Room 215 <br />Denver, Colorado 80201 <br />Phane~ 1303) 866-3567 <br />FA%: (703) R32-R106 <br />DATE: May 27, 1995 <br />TO: Bruce Humphries <br />FROM: Berhan KEFFELEW <br />RE: Sggested Changes to commitments 29,30,31&36. <br />~I~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5 Lochhead <br />Exec Wive Director <br />bl¢hael B. Long <br />Division Director <br />The following changes could make the above numbered commitments <br />more inforceable than the way they were written during the approval <br />process for Amendements 5&6 for permit # M-80-244. <br />(9)(29)IF free or wad cyanide is detected in the effluent from the <br />Arequa Gulch undedrain in concentrations that exceed baseline <br />levels which are undetectable in the 24" perforated pipe and <br />4"sprig water collection pipe which carry the ground water flow <br />below the leach pad facility and .03mg/1 WAD cyanide for the <br />discharge from the solid 24"in pipe which will carry surface water <br />or in any of the ground water monitoring wells in Wilson and Arequa <br />GULCH which are undetectable or below detection limits in all but <br />well CRMW-3A&B in AREQUA Gulch which showed a .03WAD cyanide the <br />office will conclude that heap leach containment has been lost. <br />If WAD cyanide contaminated effluent that exceed.5mg/1 inters the <br />leak detection system trenches or if the rate of solution in the <br />sumps exceed one (1)GPD per acre for the entire watershed that will <br />contribute flow to each trench the office will conclude that heap <br />leach containment has been lost.The operator shall notify the <br />office within 24 hours inthe event of any of these <br />occurrences.Further, the operator shall immediately cease <br />application of leaching solution to the heap leach and initiate <br />detoxification with in one week.Detoxification shall continue until <br />an acceptable remedy has been approved by the OMLR and implemented <br />by the permittee.All fluid volumes collected from the leak <br />detection sumps shall be inventoried by sump weekly and reported to <br />the OMLR in writing once a month. <br />