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CMC — Henderson Operations <br />DRMS 2014 Annual Water Monitoring Report <br />May 2015 <br />Tabular data for MLGW-15 along with applicable NPLs is presented in Table 2. Accompanying <br />graphs are provided in Trend Evaluations 21-24. <br />2.2.3 Point of Compliance Sampling Location: MLGW-17 <br />MLGW-17 is a shallow alluvial well located downgradient of 3 -Dam. No apparent trends, <br />deviations or exceedances were observed in 2014. <br />Tabular data for MLGW-17 along with applicable NPLs is presented in Table 2. Accompanying <br />graphs are provided in Trend Evaluations 25-28. <br />2.2.4 Point of Compliance Sampling Location: MLGW-ACR <br />MLGW-ACR is the drinking water parameter POC location located in the Aspen Creek Ranch <br />Area. Henderson continues to investigate and gather data for manganese and iron for the <br />potential development of a future ambient NPLs. No apparent trends, deviations or exceedances <br />were observed in 2014. <br />Tabular data for MLGW-ACR along with applicable NPLs is presented in Table 2. <br />Accompanying graphs are provided in Trend Evaluations 29-32. <br />2.2.5 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. No apparent trends or anomalies were observed <br />in 2014. <br />Tabular data for WFR-20 is presented in Table 2 with accompanying Trend Evaluations 33-36. <br />2.2.6 Surface Water Sampling Location: WFR-40 <br />WFR-40 is located downgradient of the Henderson Mill in the Williams Fork River. A dissolved <br />manganese value of 304 gg/L was noted in the December, 2014 monitoring event and identified <br />as a statistical outlier based upon analysis via Rosner's method. Henderson will continue to keep <br />an eye on the incoming data. No other apparent trends or anomalies were observed in 2014. <br />Tabular data for WFR-40 is presented in Table 2 with accompanying Trend Evaluations 37-40. <br />3.0 Conclusion <br />This report summarizing annual water monitoring data collected for each POC well and non - <br />POC long-term surface water monitoring location meets the conditions of the Henderson GWMP <br />reporting requirements. In accordance with the GWMP, Henderson has provided a summary of <br />2014 water monitoring data, a comparison to NPLs (where applicable), evaluation of water quality <br />trends, and outlier identification for each permit -required parameter for POC and non -POC surface <br />water locations. <br />6 of 7 <br />