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• W W ; $ '���� ����r���� COLORADO OPERATIONS <br /> tttJ tl Henderson Mine&Mill <br /> ® P.O.Box 68 <br /> Empire,CO 80438 <br /> A Freeport-McMoRan ColvetIVE0 Phone(303)569-32211 <br /> Fax(303)569-2830 <br /> June 2, 2020 NOV 1 / 2020 <br /> Mr. Peter Hays ON OF REC <br /> Environmental Protection Specialist ,,'WAGAND TMy0m, <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> Re: Climax Molybdenum Company, Henderson Mill,Permit No. M-1977-342 <br /> Proposed Technical Revision No. 31, Additional 3 Dam Seepwater Return Line Clean-out Ports <br /> Dear Mr. Hays, <br /> The 3-Dam Seepwater Return Pipelines,which consist of two 10-inch HDPE lines routing seep water from the toe <br /> of 3-Dam to the main seep water collection system at the toe of 1-Dam and Ute Park Pump station,were installed <br /> in 2000 and included a total of ten installed cleanout access locations,five on each pipe. It was determined that <br /> six additional cleanout access locations,three per pipe,were required to allow for greater access of future <br /> cleaning and maintenance. In September of 2019 the Henderson Mill successfully installed the additional cleanout <br /> access locations. <br /> The purpose of this letter is to state that the new cleanout access locations were constructed in conformance with <br /> the design plans and specifications. Each new HDPE cleanout was installed with a molded tee with a riser pipe to <br /> the surface and all joints connected with HDPE electrofusion couplings.Once all cleanouts were installed, a 24- <br /> hour pressure test was conducted along with visual inspections of each new joint. The pressure test was finished <br /> on September 19, 2019. Before acceptance of the test,each new fused joint was visually inspected for leaks with <br /> no leaks being found in any of the new joints.The pressure gauge at the discharge of each pipeline was verified <br /> to continually hold pressure throughout the 24-hour test.Afterthe inspection and pressure test,the pipelines were <br /> deemed acceptable for continued use, and put back into service. <br /> Sincerely, <br /> A i7 <br /> Dillon Benbow, P.E. <br /> Chief Mill Engineer <br /> Climax Molybdenum Company <br /> Henderson Operations <br /> 51252 �c <br /> w <br /> FSS�ONA1 E��� <br />