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CMC — Henderson Operations <br />DRMS 2014 Annual Water Monitoring Report <br />May 2015 <br />However, field parameters continue to be measured on a monthly basis. No other apparent <br />trends, deviations or exceedances were observed in 2014. <br />Tabular data for MNGW-1 along with applicable NPLs is presented in Table 1. Accompanying <br />graphs are provided in Trend Evaluations 1-4. <br />2.1.2 Surface Water Sampling Location: BG -20 <br />BG -20 is located upgradient of the Henderson Mine in Butler Gulch and serves as an indicator of <br />background surface water quality. No apparent trends or anomalies were observed in 2014. <br />Tabular data for BG -20 is presented in Table 1 with accompanying Trend Evaluations 5-8. <br />2.1.3 Surface Water Sampling Location: CC -10 <br />CC -10 is also located upgradient of the Henderson Mine in the West Fork of Clear Creek and <br />serves as another indicator of background surface water quality. No apparent trends or anomalies <br />were observed in 2014. <br />Tabular data for CC -10 is presented in Table 1 with accompanying Trend Evaluations 9-12. <br />2.1.4 Surface Water Sampling Location: CC -30 <br />CC -30 is located downgradient of the Henderson Mine in the West Fork of Clear Creek. No <br />apparent trends or anomalies were observed in 2014. <br />Tabular data for CC -30 is presented in Table 1 with accompanying Trend Evaluations 13-16 <br />2.2 Henderson Mill <br />The Henderson Mill monitoring locations include POC wells MLGW-ACR, MLGW-7, MLGW- <br />15 and MLGW-17 as well as surface water locations WFR-20 and WFR-40. Graphical trends <br />are presented as Trend Evaluations 17-40 of this report. <br />2.2.1 Point of Compliance Sampling Location: MLGW-7 <br />MLGW-7 is a shallow alluvial well nested with MLGW-15 located downgradient of 1 -Dam. <br />Monthly monitoring being conducted at MLGW-7 for an expanded parameter set as part of <br />ongoing groundwater quality assessments concluded at the end of 2014. However, field <br />parameters continue to be measured on a monthly basis. No apparent trends, deviations or <br />exceedances were observed in 2014. <br />Tabular data for MLGW-7 along with applicable NPLs is presented in Table 2. Accompanying <br />graphs are provided in Trend Evaluations 17-20. <br />2.2.2 Point of Compliance Sampling Location: MLGW-15 <br />MLGW-15 is a deeper well nested with MLGW-7 located just downgradient of 1 -Dam. <br />Henderson noted a potential slight increasing trend in conductivity values which will continue to <br />be monitored in 2015. No other apparent trends, deviations or exceedances were observed in <br />2014. <br />5 of 7 <br />