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~ • III IIIIIIIIIIIIIIII <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenl of Natural Resources <br />1713 Sherman 51., Room 215 I{l~` <br />Denver, Colorado 80203 Illr <br />Phone: 13031 8663567 <br />FAX: (703) 832-8106 <br />DEPARTMENT OF <br />July 29, 1994 NATURAL <br />RESOURCES <br />Mr. John Hardaway Roy ROmer <br />Manager of Environmental Affairs c°"e`"°` <br />Cripple Creek and Victor Gold Wmes S. LOChhead <br />Executive Director <br />V 1CtOr, (.'~ 80960 Michael B. Lang <br />Division Director <br />RE: Change in Design and Specification Chaagea to Iroa Clad <br />Tailings - Creation Project, Permit No. M-80-244 <br />Dear Mr. Hardaway: <br />The Division of Minerals and Geology has received your request for <br />changes to specifications for the soil liner. The gradation <br />specification changes were reviewed by Mr. Allen Sorenson, of the <br />Division. The changes would allow placement of up to 10 percent <br />(10°s), by dry weight, of materials over 3/4 of an inch in size. <br />Since the soil liner fill will only be screened to 3 inches maximum <br />size, the contractor must remove, by hand, rocks that exceed 2 <br />inches in size. <br />The Division has also reviewed the extensive geochemical analysis <br />report submitted which included results of detoxification using <br />calcium hypocholoride, acid base accounting, meteoric water <br />mobility tests and the total risk assessment using conservative <br />assumptions. The review was conducted by Dr. Harry Posey and <br />myself. <br />The Division is satisfied with the results and, at this time, <br />grants approval of the Iron Clad Tailings as soil liner. The <br />Division requests that all of the detoxification results be <br />submitted, when completed. <br />If you have additional questions or concerns, please contact me. <br />Sincerely, <br />tit ~~~'-~xQ~ <br />Berhan Keffelew <br />Environmental Specialist <br />cc: Bruce Humphries <br />M:\oss\gaw\soJ <br />