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�5t� <br /> 0Z_ <br /> ® Climax Molybdenum COLORADO endersonlMine <br /> A Freeport-McMoRan Company 1746 County Road 202 <br /> Empire, CO 80438 <br /> Phone (303)569-3221 <br /> July 28, 2017 RECEIVED <br /> Delivered via UPS: 1Z 804 847 02 7551 2086 CAUL 31 2017 <br /> DMSION OF RECLAMATION <br /> Mr. Peter Hays MINING AND SAFEtY <br /> State of Colorado <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> f/ 11� <br /> Re: Mine Groundwater NPL Exceedance Notification, Permit No. M-1977-342 <br /> Dear Mr. Hays- <br /> Henderson Mine is providing this written notification of an NPL exceedance for pH at groundwater point of <br /> compliance (POC) well MNGW-1, downgradient of the Henderson Mine, in accordance with Section 5 3 of <br /> the Henderson Groundwater Management Plan. This written notification is follow-up to the verbal <br /> notification that was made to you via voicemail on July 281h, 2017. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on July 5th, 2017, with a pH value <br /> of 6 4 standard units (s.u.). This exceeded the numeric protection limit (NPL) of 6.5-8.5. As required by <br /> the Groundwater Management plan, a follow-up pH measurement was taken within 30 days on July 20th <br /> 2017, resulting in a pH of 6.1 s.u. <br /> These results do not appear to be anomalous, or obvious outliers If you have any additional questions or <br /> concerns, please feel free to contact me at 720-942-3518. <br /> Sincerely, <br /> �.� f , <br /> Tim Haynes <br /> Chief Environmental Scientist <br /> Climax Molybdenum Company <br /> Henderson Operation <br /> cc (via email). <br /> M. Hamarat, Climax <br /> A. Ungers, Climax <br />