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CMC—Henderson Operations <br /> DRMS 2017 Annual Water Monitoring Report <br /> May 2018 <br /> course of the rehabilitation work, the well contractor noted that the well was constructed as a <br /> straight-cased well, with inflow to the well only possible through the bottom. This style of well <br /> construction can inhibit water flow-through by the aquifer. Following the rehabilitation work, <br /> and resumed steady use of the well seemed to mitigate iron and manganese level concerns. <br /> Henderson will continue to monitor this data to determine whether iron-reducing bacteria <br /> rebounds within this well system. No other apparent trends, deviations or exceedances were <br /> observed in 2017. <br /> Tabular data for MLGW-ACR along with applicable NPLs is presented in Table 2. <br /> Accompanying graphs are provided in Trend Evaluations 21-24. <br /> 2.2.3 Point of Compliance Sampling Location: MLGW-15 <br /> MLGW-15 is a deeper well nested with MLGW-7 located just downgradient of 1-Dam. No <br /> apparent trends, deviations or exceedances were observed in 2017. <br /> Tabular data for MLGW-15 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-17 <br /> MLGW-17 is a shallow alluvial well located downgradient of 3-Dam. No apparent trends, <br /> deviations or exceedances were observed in 2017. <br /> Tabular data for MLGW-17 along with applicable NPLs is presented in Table 2. Accompanying <br /> 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 2017. <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. No <br /> apparent trends or anomalies were observed in 2017. <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 /> 2017 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 />