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0 <br /> Ten Mile Tailing Impoundment and Dam: The Ten Mile tailing impoundment, No. 3 Dam, and <br /> ancillary facilities such as Ten Mile barge and Ten Mile Tunnel are monitored visually by Climax <br /> personnel. <br /> Mayflower Tailing Impoundment and Dam: The Mayflower tailing impoundment, No. 5 Dam, <br /> and ancillary facilities such as the riser/decant system are monitored visually by Climax <br /> personnel. Visual monitoring is more extensive at Mayflower because of its function as the water <br /> treatment system. <br /> Mayflower Seepwater Collection and Return Svstem (Mavflower Pump Station): The Mayflower <br /> seepwater collection and return system'at the Mayflower pump station is monitored visually. <br /> The pump station contains both stand-by pumps and a stand-by generator set should mechanical <br /> or power failures occur. When the system is serviced or otherwise shut down, the decant risers <br /> on the impoundment can be closed to prevent discharge until the system is reactivated. <br /> Treated Water pH Control Station: Sulfuric acid is pumped from the storage tank through the <br /> acid pump located in the Mayflower pump station. pH measurements are taken continuously, <br /> • and the pump adjusted accordingly on a constant feedback loop. As with the Mayflower pump <br /> station, the pH control facility is monitored visually and by a telemetric alarm. The system is set <br /> to a high (pH: 8.8) and a low (pH: 6.7) alarm which automatically makes a radio call after 20 <br /> minutes. During this 20 minute period, the system works in a self-correcting mode. This remote <br /> alarm triggers at the mill control room and on site radio channel#1. A second alarm is triggered at <br /> the 55 minute mark if the pH does not self-adjust, and discharge is terminated and water diverted <br /> to the clear water pond. If the pH self-adjusts during the 55 minute period, the clock is reset and <br /> the system returns to normal operation. <br /> Interceptor Canal Svstem: The east and west interceptor canal systems are checked by a two <br /> man crew from Climax. Debris and snow accumulations are cleaned from the system as needed. <br /> Dust Suppression: Visual monitoring of the tailing impoundments is conducted daily as a <br /> general part of other maintenance routines at Climax. As discussed, Coherex is applied to the dry <br /> beach areas of the tailing impoundments in the late Spring when visual observation indicates that <br /> tailing dust may begin blowing. The application period varies depending upon snow conditions <br /> at the Site. Coherex is applied on a one-time basis. Spot applications are made periodically <br /> during the snow-free season as conditions dictate. With the completion of capping of the <br /> Mayflower and Robinson impoundments, only the Ten Mile tailing impoundment and No. 3 <br /> • Dam remain as potential sources of blowing tailing. <br /> 35 <br />