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999 <br /> 5TATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY PFUT <br /> w <br /> Department of Natural Resources <br /> ik <br /> 1313 Sherman St.,Room 215 <br /> Denver,Colorado 80203 <br /> Phone:(303)866-3567 <br /> FAX-(303)832-8106 <br /> DEPARTMENT OF <br /> NATURAL <br /> RESOURCES <br /> Roy Romer <br /> Z <br /> Governor <br /> cember 20, 1994 <br /> James S.Lochhead <br /> Executive Director Director <br /> Mr. Larry Perino <br /> Michael B Long <br /> Sunnyside Gold Corporation <br /> Division Director <br /> P.O. Box 177 <br /> Silverton, CO 81433 <br /> Re: Groundwater Tracer Requirement., Sunnyside Mine, Technical Revision TR-014, <br /> Permit No. M-77-378 <br /> Dear Mr. Perino: <br /> As you are aware, the tracer requirements incorporated into technical revision TR-014 <br /> were discussed at a meeting held last week at the offices of the Water Quality Control <br /> Division (WQCD) . WQCD's position on the introduction of a tracer into the Sunnyside <br /> Mine, is that Sunnyside Gold Corporation must insure that any tracer discharged to <br /> surface water will not result in a violation of numeric or narrative stream standards. <br /> This includes the prevention of any discharge of toxic pollutants in toxic amounts. <br /> Rule 3.1.6 of the Mineral rules and Regulations of the Mined Land Reclamation Board <br /> requires that disturbances to the prevailing hydrologic balance be minimized by <br /> measures including compliance with applicable federal and Colorado water quality laws <br /> and regulations. Based on testing commissioned by Sunnyside Gold, it appears that <br /> addition of Sodium Bromide to the American Tunnel discharge would increase whole <br /> effluent toxicity by increasing the reproductive effects on Ceriodaphnia, i.e. , result <br /> in a discharge of toxic pollutants in toxic amounts. <br /> It is unfortunate that an effective, non-toxic tracer could not be found for this <br /> project. The information from a tracer monitoring program could have proven <br /> invaluable as a mechanism to determine groundwater movement patterns in the local <br /> system. However, given the foregoing discussion, the Division of Minerals and Geology <br /> will waive the tracer requirements of TR-014, and will rely on the other aspects of <br /> the approved monitoring program to determine hydrologic impacts resulting from <br /> flooding the Sunnyside Mine. <br /> If you have any questions, please contact me. <br /> Sincerely , <br /> Allen C. orenson <br /> Reclamation Specialist <br /> cc: Pat Nelson, WQCD <br /> C:\WP51\SGC6 <br />