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999 <br /> STATE OF COLORADO <br /> (VISION OF MINERALS AND GEOLOGY �W <br /> Department of Natural Resources <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 /> /,ne 25, 1996 Roy Romer <br /> Governor <br /> Mr. Bryce Romig James Lochhead <br /> Climax Molybdenum Company A"r Executive Director <br /> Climax Mine Michael B Long <br /> Climax,, CO 80429 Division Director <br /> RE: vl-Dam Seep Water Pump Station and Impoundment, <br /> Climax Mine and Mill, Permit No. M-77-493 <br /> `.-Ol <br /> Dear Mr. Romig: <br /> The Division has reviewed the preliminary design report and drawings for the above <br /> referenced Environmental Protection Facility, and has determined that the following <br /> items need to be addressed for the design report to meet the minimum requirements of <br /> Rule 7.3 of the Hard Rock/Metal Mining Rules and Regulations of the Mined Land <br /> Reclamation Board: <br /> 1. It is stated in the preliminary design report that the Office of the State <br /> Engineer specifies an inflow design flood for Robinson Lake equal to 75 percent of the <br /> probable maximum flood. Rule 5.A. (5) (b) of the State Engineer's Rules and Regulations <br /> for Dam Safety and Dam Construction specifies an inflow design flood equal to 100 <br /> percent of the probable maximum flood for Class I dams. Has Climax received a <br /> dispensation for an existing structure? Please provide clarification. <br /> 2. The Division concurs with the statement in the preliminary design report that the <br /> new containment dike would not be a jurisdictional structure because it is within the <br /> existing impoundment, however, the new containment dike will be considered an <br /> environmental protection facility. As such, technical specifications, e.g. , gradation, <br /> moisture content, and density specifications, etc. for the embankment soils, as well as <br /> a construction quality assurance plan, e.g. , bentonite amended soil mixing and blending <br /> protocols, geotechnical testing types and frequencies, etc. , must be submitted for <br /> Division review prior to construction of the dike. <br /> If you have any questions, please contact me. <br /> Sinc rely, <br /> Pen' C. Sorenson <br /> Reclamation Specialist <br /> C:\WP51\CLIMAX.R8N <br />