2011-08-08_REVISION - M1977493 (36)

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• • Water Quality Monitoring Plan Climax Molybdenum Company Version: R1 Permit No, M- 1977 -493 Internal monitoring sites have been established as an additional protective measure to detect potential changes in water quality above both Clinton and Eagle Park Reservoirs. As discussed in Section 3, these sites will include the following locations: • At least one new groundwater monitoring well (EVMW -2) will be constructed between the north abutment of 1 Dam and Eagle Park Reservoir (Figure 3); • Spring and seep sampling in the area above Eagle Park Reservoir as identified on Figure 3; • A surface water sampling site in Clinton Creek, above Clinton Reservoir (Figure 5); and • A surface water sampling site in the East Interceptor ditch above Clinton Reservoir (Figure 5). 52.2 Monitoring Schedule Internal monitoring sites upgradient of Eagle Park and Clinton Reservoirs will be monitored initially to establish baseline conditions but also at a frequency to detect potential seasonal variation in water quality. The new internal monitoring sites will be established during the 2011 field season so that subsequent sample collection can occur at least several times before snow conditions restrict further site access. Monitoring and data analysis for internal sites will be performed four times per year, weather and access conditions permitting (typically June, August, October and December). 5.2.3 Data Analysis After the baseline data have been collected and quality assurance /quality control (QA/QC) completed, in accordance with the procedures outlined in Section 6, Climax will calculate the mean and standard deviation for each parameter at each sampling location. These statistical parameters will be used in subsequent statistical evaluations of the data. Following the baseline period, Climax will review the monitoring results from internal sites to determine whether the most recent sampling results are consistent with the baseline data, or if the results might be considered to contain one or more outliers. If Climax determines that the recent sampling results may not be consistent, they may elect to collect an additional sample for inclusion in the dataset to be used for trend analyses. If a statistically significant trend of water - quality degradation is present, Climax will promptly notify the DRMS and the relevant reservoir company. The following sections detail the procedures that will be followed to evaluate the data. 5.2.3.1 Visual and Statistical Trend Evaluation Climax will routinely evaluate water quality trends, and report findings in the Annual Reclamation Report, a copy of which will be made available to the reservoir companies. Evaluation of trends can be complicated by seasonal changes in precipitation and recharge, and by delayed response to events. It is expected that water quality in the reservoirs will respond quickly to changes in the quantity and /or quality of runoff water, and respond slowly to changes in the quantity and /or quality of groundwater. Before long -term changes can be identified, short - term changes (such as seasonal effects) need to be recognized and considered. EPP — Appendix C August, 2011 19