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W. W. WHEELER <br />& ASSOCIATES, INC. <br />Water Resources Engineers <br />3700 S. INCA STREET I ENGLEWOOD, CO 60 1 1 0-3405 <br />303-76 1 -41 30 1 FAX 303-76 1 -26D2 <br />TECHNICAL MEMORANDUM <br />March 19, 2014 <br />To: Ray Lazuk <br />Climax Molybdenum Company <br />From: Jeremy Wells, P.E. and Michael Stonefelt, P.E. <br />W. W. Wheeler & Associates, Inc. <br />Re: Climax Mine Interceptor Evaluation <br />No: 1051.27.02 <br />1.0 INTRODUCTION <br />WWW.WWWHEELER.COM <br />Wheeler has completed an evaluation of the existing conditions of the Climax Mine fresh water <br />interceptor systems. The purpose of the evaluation was to determine whether the interceptor <br />systems have sufficient hydraulic capacity to safely pass the runoff expected from a storm event <br />with a 10 -year return period (frequency). This evaluation fulfills the requirements as set forth in <br />TR -18 for the Colorado Division of Reclamation, Mining, and Safety (DRMS) as stated: <br />"... Climax proposes to conduct a comprehensive inspection of the interceptor systems during the <br />upcoming snowmelt runoff period in the spring of 2012. The data collected from the initial <br />inspection, subsequent field surveys, if warranted, and hydrologic analyses will then be used to <br />determine that the systems can safely pass a 10 -yr/ 24 -hr rainfall event." <br />The interceptor systems that were included in this analysis are the Chalk Mountain Interceptor, <br />East Interceptor, and West Interceptor. The evaluation involved four distinct phases, as <br />described below. <br />Phase I: Wheeler performed a field reconnaissance of the interceptor systems during the 2012 <br />snowmelt runoff period. The intent of this phase was to observe the interceptor systems in <br />rA1 000\1 051\1 051.27.02_ interceptor\ documents\ 14mar19tm_lazuk_interceptoreval uation.docx <br />