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Climax Molybdenum <br />A Freeport-McMoRan Company <br />November 6, 2015 <br />Certified Mail # 7015 0640 0007 5449 4769 <br />Mr. Peter Hays <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />COLORADO OPERATIONS <br />Henderson Mine and Mill <br />P.O. Box 68 <br />Empire, CO 80438 <br />Phone (303) 569-3221 <br />Fax (303) 569-2830 <br />RECEIVED <br />NOV 12 2016 <br />MOON 67Zirt24 <br />Re: Climax Molybdenum Company, Henderson Mill, Permit No. M-1977-342 <br />Technical Revision No. 24, Droptower 13 & 14 Removal and RCP to HDPE TDL <br />Pipe Replacement <br />Dear Mr. Hays, <br />Climax Molybdenum Company (CMC) is hereby submitting the final as -built drawings for the <br />approved replacement of reinforced concrete TDL pipe with high-density polyethylene TDL <br />pipe, and for the removal of Droptowers 13 and 14. Please find enclosed with this letter, two as - <br />built sets of drawings and two Engineer of Record certifications by W.W. Wheeler & Assoc. and <br />Baur & Assoc. for piping and structural designs, respectively. Please note that there was an <br />overlap of efforts between Technical Revision 22 (TDL Refurbishment, Droptower 15 & 16 <br />Removal) and this Technical Revision (TR -24), which explains the common drawings and <br />certifications. <br />If you have any additional questions, concerns or require more information regarding this <br />project, please feel free to contact me at (720) 942-3518 or Miguel Hamarat (720) 942-3255. <br />Regards, <br />lz <br />Tim Haynes <br />Sr. Environmental Engineer <br />Freeport-McMoRan Copper & Gold <br />Climax Molybdenum Company <br />Henderson Mill <br />19302 County Road 3 <br />Parshall, CO 80468 <br />720-942-3518 <br />tim havnes(affmi.com <br />CC: M. Hamarat (CMC) <br />✓ Compliance <br />✓ NO Violations <br />