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Water Quality Monitoring Plan Climax Molybdenum Company <br /> Version R4 Permit No. M-1977-493 <br /> 5.2.1.1 Notification and Consultation <br /> The following steps outline the procedure that will be taken if a result is confirmed to have exceeded an <br /> NPL. <br /> 1) Climax will verbally notify DRMS that an exceedance has occurred. Written notification will be <br /> provided within 5 days of receiving the analytical results for the second, confirmation sample. <br /> Notification will include, at a minimum, the following information: <br /> a) The constituent identified to be in excess of established limit; <br /> b) The location at which the exceedance was identified; <br /> c) Analytical data, including the date the samples were collected and the concentrations at which <br /> the constituent was measured; and <br /> d) Increased monitoring measures being undertaken. <br /> Notifications will be submitted to the following location: <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, Colorado 80203 <br /> 2) The increased monitoring proposal will address a modified sampling frequency for the POC well <br /> and may also include an increase of the frequency of sampling of upgradient internal monitoring <br /> locations and the adjacent surface water in the vicinity of the POC well (the Arkansas River, the <br /> East Fork of the Eagle River, Eagle Park Reservoir, or Tenmile Creek) for DRMS review and <br /> approval. The proposal will include a schedule for reporting and follow up discussions with DRMS. <br /> 3) If the results of the additional monitoring data indicate that quality of the adjacent surface water <br /> may be affected, Climax will notify DRMS and initiate timely discussions with DRMS and the <br /> affected reservoir company, if applicable, on the appropriate actions to be implemented. <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 /> EPP—Appendix C March 2018 27 <br />