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Groundwater Monitoring & Response Plan 3.2 Monitoring Schedule Once installed, pressure transducers will remain in place throughout the year. Each pressure transducer will be programmed to record pressure readings at least every six hours; the recording frequency may be increased during active dewatering if needed to refine model predictions. The stored data record for each well will be downloaded and examined immediately prior to commencement of dewatering to assess initial conditions and identify any natural trends in local groundwater levels. The pre - operational data will be plotted on charts showing water levels over time. During active dewatering, the data record will be closely monitored, downloaded and examined at least weekly. The data will be incorporated into the pre - operational water level plots and input to the numerical model as necessary to forecast changes to private wells in the vicinity of the Pit. If a pressure transducer cannot be installed in the McGarry well, water levels in the well will be estimated on the basis of pressure transducer readings for the monitoring wells and periodically confirmed with manual measurements using a hand -held water level indicator. Staff gage readings for the Animas River will be periodically recorded as needed to support model calibration and refinement. 3.3 Water Level Monitoring Equipment The following equipment and supplies will be used to conduct the water level monitoring program: • Electronic pressure transducers with data logging capabilities and direct -read cables • Telemetry system for each well, if used • Electronic hand -held water level indicator • Calibrated staff gage • Deionized or distilled water and decontamination equipment (e.g. Alconox detergent or equivalent, 10% bleach solution, bucket, brush, chemical free paper towels.) • Logbook Western Water & Land, Inc. 5