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Water Quality Monitonng Plan Climax Molybdenum Company <br /> Version:R4 Permit No. M-1977-493 <br /> 5.2.2 Additional Data Evaluation <br /> This section applies to the POC wells and the existing internal monitoring sites in the Tenmile Creek <br /> Watershed (GW#1 and TM-MW-001 D) and in the Arkansas River Watershed (ARK-MW-002S and ARK- <br /> MW-002D). Additional data evaluation for wells in the Eagle River Watershed is described in Section 6.3. <br /> 5.2.2.1 Trend Evaluation <br /> Climax will routinely evaluate indicator parameter water quality trends for the groundwater monitoring sites <br /> identified above on an annual basis, and report findings in the Annual Report to DRMS. This trend <br /> evaluation will be performed by viewing and presenting the data graphically and evaluating any observable <br /> visual trend. Evaluation of trends can be complicated by seasonal changes in precipitation and recharge, <br /> and by delayed response to events. Therefore, the evaluation will consider short-term changes (such as <br /> seasonal effects) in determining whether a trend in water quality exists. In other words, if seasonal peaks <br /> occur in concentrations, the evaluation should be performed to determine if there are trends in the peak <br /> concentrations. <br /> If graphical trends do not suggest declining water quality, no further action is required and monitoring will <br /> continue on a quarterly basis, access and weather conditions permitting. However, if a trend is observed <br /> that does suggest increasing concentrations in parameters, Climax will evaluate downgradient data, <br /> consider potential sources or causes of the trend, and if necessary develop a plan for increased monitoring <br /> frequency or further actions. <br /> 5.2.2.2 Outlier Identification <br /> Outlier results can and do occur in environmental monitoring. The general practice will be to not remove <br /> outliers from the water-quality database, but to consider them in the visual and statistical trend evaluations. <br /> However, Climax will perform outlier testing using Rosner's outlier or other applicable test, considering the <br /> size of the available sample set and the validity of statistical tests for the circumstance, and report the <br /> results in its annual monitoring report. Test results identified as"outlier"will be maintained in the monitoring <br /> database, but may be excluded in trend or statistical analyses. <br /> 5.2.2.3 Notification and Consultation <br /> Upon determination that declining quality trends are being observed, Climax will notify DRMS of the <br /> evaluation findings. Climax will consult with the DRMS to determine the appropriate actions to be taken. <br /> 5.3 Reporting <br /> Climax will report all data collected for the indicator parameter list and the results of data analyses <br /> performed thereon under this monitoring plan in its Annual Reclamation Report to DRMS. Climax will report <br /> the data collected every three years for the expanded baseline parameter list in its Annual Reclamation <br /> Report to DRMS. <br /> EPP—Appendix C May 2018 28 <br />