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999 <br /> li STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources P IV,7 TA <br /> 1313 Sherman St., Room 215 <br /> Denver,Colorado 80203 <br /> Phone:(303)866-3567 <br /> FAX:(303)832-8106 601 <br /> DEPARTMENT OF <br /> NATURAL <br /> RESOURCES <br /> October 28, 1996 Roy Romer <br /> Governor <br /> James S.Lochhead <br /> Mr. Bryce Romig /' Executive Director <br /> Climax Molybdenum Company //ice Michael B.Long <br /> Climax Mine Division Director <br /> Climax, CO 80249 <br /> RE: 4-Dam Seep Water Return System Modifications, <br /> Submittal of detail for passage of containment <br /> through 4-dam, Climax Mine, ermi o. M-77-493 <br /> Dear Mr. Romig: <br /> Thank you for the submittal of the above referenced design details. If <br /> the Division and Climax Molybdenum Company can agree to one modification, <br /> then the Division can accept the leak collection and conveyance system <br /> proposed for the 4-Dam seep water return pipeline. It is the Division's <br /> opinion that the clay barrier to be located at Station 16+80 should be <br /> augmented at its upstream face with a layer of geomembrane that is <br /> continuous with the geomembrane in the pipeline trench. The 4 inch and <br /> 8 inch pipes would then have to be booted through the geomembrane. Such <br /> a design modification would provide continuous geomembrane containment for <br /> possible leakage from the 8 inch pipeline with the exception of the <br /> section of pipeline that passes through the 4-Dam embankment. <br /> If you have any questions, please contact me. <br /> Sincerely, <br /> Allen C. Sorenson <br /> Reclamation Specialist <br /> C:\WP51\CLIMAX2.4DM <br />