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_�'4< <br />Climax Molybdenum <br />A Freeport- McMoRan Company <br />March 20, 2014 <br />Via Email and UPS Tracking #: 1Z 804 847 03 77985614 <br />Mr. Peter Hays <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203 <br />COLORADO OPERATIONS <br />Henderson Mine <br />1746 County Road 202 <br />Empire, CO 80438 <br />Phone (303) 569 -3221 <br />Re: Mill Groundwater Quality Assessment for MLGW -7 Low pH, Permit No. M- 1977 -342 <br />Dear Mr. Hays: <br />Henderson Mill is providing the attached Groundwater Quality Assessment in response to low pH <br />measurements at point of compliance (POC) monitoring well MLGW -7 and per the commitments made in <br />the September 12, 2013 letter to you on this issue. <br />Based on the recommendations provided by AJAX and Clear Creek Associates, Henderson intends to: <br />• Work to establish pH NPLs at MLGW -7 and other POC wells that appropriately bracket naturally <br />occurring conditions using statistical methods consistent with those utilized in the development of <br />past ambient NPLs. <br />• Return to the triannual monitoring frequency and indicator parameter list specified in the <br />Groundwater Monitoring Plan. <br />If you have any additional questions or concerns, please feel free to contact me at (720) 942 -3255 or <br />Bryce Romig (720) 942 -3231. <br />Sincerely, <br />MX7� �4�� <br />Miguel Hamarat <br />Chief Environmental Engineer <br />Climax Molybdenum Company <br />Henderson Operations <br />cc (via email): <br />B. Romig, Climax <br />S. Deely, Freeport- McMoRan <br />N. Hall, Freeport- McMoRan <br />L. Decker, Gallagher & Kennedy <br />