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Water Quality Monitoring Plan Climax Molybdenum Company <br /> Version. R4 Permit No. M-1977-493 <br /> 5.2 Data Analysis <br /> 5.2.1 POC Groundwater Monitoring Sites NPL Evaluation <br /> This section presents the data analysis and reporting procedures established for POC wells: ARwell and <br /> ARK-MW-001 D in the Arkansas River Watershed; EVMW-3S, EVMW-3D and EV-MW-004 in the Eagle <br /> River Watershed; and GW#2 and TM-MW-002D in the Tenmile Creek Watershed. The data evaluation for <br /> the POC wells involves a comparison against NPLs, as provided in Tables 5-1 through 5-7. <br /> For POC wells, the first step in evaluating the results of individual sampling events will be a simple <br /> comparison against the NPL. If a sample result exceeds the NPL, field forms will be reviewed and the <br /> laboratory will be contacted to check for potential errors. If the initial data quality review does not reveal <br /> any errors, the DRMS will be notified and the well will be resampled within 30 days of the receipt of the <br /> analytical data. If the second analytical result does not exceed the NPL, sampling will continue at the <br /> normally scheduled frequency. If the second sample confirms the first result, additional data evaluation <br /> including outlier tests and data distribution and trend analyses will be performed, along with the additional <br /> steps presented below. <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 /> EPP—Appendix C May 2018 27 <br />