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COLORADO OPERATIONS <br /> ® Climax Molybdenum Henderson Mill <br /> A Freeport-McMoRan Company 19302 CR 3 <br /> Parshall, CO 80468 <br /> Phone (303)569-3221 <br /> September 5, 2018 VV ® <br /> Delivered via UPS: 1Z 804 847 03 7341 2141 <br /> vp 06?Qr8 <br /> —'��r. Peter Hays QIVISIONOFP <br /> State of Colorado MINING,401f T�y, <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> Re: Mill 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 MLGW-7, down gradient of the Henderson Mill Tailing Storage Facility, in <br /> accordance with Section 5.3 of the Henderson Groundwater Management Plan. This written notification is <br /> follow-up to the verbal notification that was made to you in person on August 30th, 2018. <br /> MLGW-7 was sampled during a normally scheduled monitoring event on August 91h, 2018, with a pH value <br /> of 6.2 standard units (s.u.). This exceeded the numeric protection limit(NPL) of 6.5-8.5 As required by the <br /> Groundwater Management plan, a follow-up pH measurement was taken within 30 days on August 22nd <br /> 2018, resulting in a pH of 6.2 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 720-942-3384. <br /> Sincerely, <br /> '4 V <br /> A7\,^ <br /> Alex Ungers <br /> Environmental Scientist <br /> Climax Molybdenum Company <br /> Henderson Operation <br /> cc(via email): <br /> M. Hamarat, Climax <br /> A. Hilshorst, Climax <br />