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® Climax Molybdenum <br />A Freeport- McMoRan Company <br />November 27, 2013 <br />Sent by Certified Mail <br />Mr. Eric Scott <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Re: Climax Mine, Robinson Seep Investigations — 2013 Results <br />Dear Mr. Scott; <br />1 Climax Mine <br />1 Highway 91 - Fremont Pass <br />Climax, CO 80429 <br />Phone (719) 486 -7718 <br />Fax (719) 486 -2251 <br />The attached report provides the results of our 2013 investigations to characterize and determine the causes of <br />increasing trends of certain water quality constituents in the vicinity of groundwater monitoring well EVMW- <br />1S below Robinson Lake. Climax irs�fed DBMS and Eagle River Water & Sanitation District <br />( ERWSD) of this issue in April of this year and outlined a plan to investigate the area in a letter to you dated <br />April 19, 2013. The investigation work in 2013 included reviewing all hydrogeological and chemical data <br />associated with the area, conducting site reconnaissance and collecting additional water quality data, <br />conducting subsurface drilling and sampling to further characterize groundwater conditions, and developing a <br />conceptual hydrogeochemical model of site conditions. <br />The report includes investigation results through November 2013. An increasing trend in constituent <br />concentrations of indicator parameters was observed through April 2013 in EVMW -IS. With the exception <br />of iron and manganese, concentrations of constituents decreased slightly in May and appeared to have <br />generally stabilized through September. Concentrations of iron and manganese collected from EVMW -1 S in <br />October and November were higher than those observed in previous months, while stable or slightly <br />decreasing trends in concentrations of other parameters continued. The recent trends for most water quality <br />indicator parameters in the Robinson Lake Seep and EVMW -IS, and the delineation of the extent of seepage <br />which identified a narrowing and closure of the seepage path north of the cutoff wall, indicate no immediate <br />threat to Eagle Park Reservoir water quality. However, contingencies have been identified and additional <br />work will be conducted to determine the potential causes for the continuing increases in iron and manganese. <br />Please feel free to contact me at 719- 486 -7584 if you have questions on the report. We will continue to <br />provide you and ERWSD with status reports as new information is obtained. <br />Sincerely, <br />Raymond Lazuk <br />Environmental Manager <br />attachment <br />c: Linn Brooks, ERWSD <br />RECEIVED <br />NOW ? 70,tJ <br />