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Mr. Peter Hays, DRMS <br /> May 24,2022 <br /> (d) No monitoring or analyses beyond that described above were performed for this situation <br /> since the water from the system was contained on-site and did not impact any natural water <br /> body. <br /> (e) As of May 20, 2022 a formal root cause analysis has yet to be completed, though it is <br /> underway. The preliminary cause for this incident appears to be that over time fatigue of <br /> the vent has caused degradation of the internal working of the mechanism causing it not <br /> functioning properly under the higher pressures seen during 2 pump operation of the barge. <br /> To rectify this situation, the valve will be replaced and preventative maintenance programs <br /> will be put in place to inspect and functionally test the vent mechanisms on a regular basis. <br /> If you have any additional questions or concerns, please feel free to contact me at 720-942-3631 or Miguel <br /> Hamarat at 720-942-3255. <br /> Sincerely, <br /> e�qf­­_ <br /> Geoff Niggeler <br /> Chief Environmental Engineer <br /> Climax Molybdenum Company <br /> Henderson Operations <br /> CC (via email): <br /> M. Hamarat, Climax <br /> Page 2 <br />