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Technical Revision 25, Rev. 1 Schwartzwalder Mine <br /> 3.2.3 Geological and Geochemical Conditions <br /> Section 8 of the Revised EPP presents geological conditions, and Section 14 of the Revised EPP presents <br /> geochemical conditions. <br /> 3.2.4 Monitoring and Sampling <br /> Water levels will be monitored in the clean water, treated water, and reactor tanks in the following <br /> manner: <br /> • Water levels within the two, 20,000-gallon storage (treated water)tanks (which are connected via <br /> a 4" pipeline) are monitored with a pressure transducer connected to the programmable logic <br /> controller(PLC). The PLC maintains the levels within the tanks to a determined height by <br /> speeding up or slowing down booster pumps that draw from these storage tanks and provide <br /> pressure for the RO system. <br /> • Water levels within the reactor tank will be monitored by a pressure transducer connected to the <br /> PLC. Water level control is accomplished by a throttling valve. <br /> • Water levels within the clean water tank will be monitored by a pressure transducer connected to <br /> the PLC. <br /> The treated water tanks and the reactor tank will not be sampled routinely. However, the clean water tank <br /> will be sampled as required by Cotter's discharge permit CO-0001244. Sampling will occur from a <br /> sampling port within the NWTP building immediately upstream of the clean water tank, except for pH. <br /> pH will be measured by a probe in the clean water tank or in the discharge pipe immediately downstream <br /> of the clean water tank. <br /> 3.2.5 Pollution Control Measures <br /> The reactor tank and the 20,000-gallon treated water tanks are, or will be, placed within secondary <br /> containment that is sufficient to completely contain spills from these tanks. Furthermore, the treated <br /> water tanks and the clean water tank are situated within a bermed area on the mesa, which will prevent <br /> spills from reaching the mine access road. The reactor tank is situated in an area where released water <br /> would be contained within the Sump 10 area, if a spill overtopped the secondary containment. <br /> Because of berms and topography, spills from the treated water and reactor tanks will not enter Ralston <br /> Creek. Although no secondary containment is provided for the clean water tank, berms constructed on the <br /> mesa and topography will also prevent this water from flowing directly into Ralston Creek. Therefore, the <br /> combination of monitoring systems (Section 3.2.4), secondary containment, berms, and topography will <br /> prevent environmental and human health impacts associated with the operation of the clean water, reactor, <br /> and treated water tanks. <br /> Mine Permit M-1977-300 <br /> Cotter Corporation(N.S.L.) 15 June 2017 <br />