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CMC — Henderson Operations <br />DRMS Annual Water Monitoring Report <br />May 2013 <br />3.2.2 Surface Water Sampling Location: WFR -20 <br />WFR -20 is located upgradient of the Henderson Mill in the Williams Fork River and serves as an <br />indicator of background surface water quality. The limited data suggest an increase in specific <br />conductance during the October 2012 monitoring event. This data point appears to be an outlier <br />and will continue to be assessed as future monitoring data becomes available. No other <br />anomalies were observed. <br />Tabular data for WFR -20 is presented in Table 2. <br />3.2.3 Surface Water Sampling Location: WFR -40 <br />WFR -40 is located downgradient of the Henderson Mill in the Williams Fork River. No <br />anomalies were observed. <br />Tabular data for WFR -40 is presented in Table 2. <br />4.0 Groundwater Studies at the Mill <br />A Technical Memorandum has been prepared summarizing the work that has been completed to <br />date in accordance with Section 3.2.6.1 of the GWMP to evaluate the need for additional POC <br />wells at MLGW -7, below 3 -Dam and in the Potato Gulch drainage area. These potential <br />additional locations are being assessed to ensure adequate lateral coverage in areas downgradient <br />of the tailing storage facility. The Technical Memorandum is appended to this report as <br />Appendix A, Climax Molybdenum Company, Henderson Operations Groundwater Monitoring <br />Point of Compliance (POC) Technical Memorandum. <br />5.0 Conclusion <br />This report concerning the summary of annual water monitoring data collected for each POC <br />well and non -POC long -term surface water monitoring location meets the conditions of the <br />Henderson GWMP reporting requirements. In accordance with the GWMP, Henderson has <br />provided a summary of the 2012 annual water monitoring data, a comparison to NPLs, evaluation <br />of water quality trends, and outlier identification for each permit- required parameter for POC and <br />non -POC surface water locations. Additionally, a Technical Memorandum has been provided to <br />indicate the progress of the ground water investigation at the Henderson Mill. <br />5 of 5 <br />