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SECTIONFIVE water Management Systems <br /> 5.3.1.1 Operation and Maintenance <br /> The drains operate freely and convey water through the drains and main collection pipe to the 5 <br /> Dam concrete seepage collection ponds. The drains were inspected in 2012 and portions of the <br /> main collection pipe were replaced in 2013 (see above). <br /> Remote video inspections will be conducted every 5 years and may also be conducted if <br /> evidence exists the main line has become compromised; otherwise little other maintenance is <br /> anticipated. <br /> 5.3.U Instrumentation <br /> Historically there has not been instrumentation installed specifically within the subdrain system, <br /> although flows have been measured at the Mayflower pump station for many years. The <br /> measured flow rate potentially includes minor surface runoff that contributes to the seepage <br /> collection ponds,but generally reflects the seepage collected within the subdrain system. <br /> New flow monitoring instrumentation was installed during the 2013 collector pipe replacement. <br /> Instrumentation consisting of"Montana flumes"was installed to separately measure the flows <br /> from the right abutment groin, the left abutment groin, and the center portion of the dam. The <br /> three measured flows sum to the total seepage flows collected within the subdrain system. The <br /> flows pumped from the Mayflower pump station continue to be monitored. <br /> The "Montana flumes"are coupled with electronic pressure transducers to measure flow rate, <br /> which is then stored in a local data logger,transmitted wirelessly through a radio signal, and <br /> stored on a server. The flow rate data is collected hourly and recorded in a database that is <br /> monitored periodically. However,the center portion flow will only be measured during non- <br /> freezing months due to fixed invert elevations. Visual monitoring for changes in clarity will also <br /> be performed periodically as part of normal operation of the tailing storage facility. <br /> L\PROJECTS\22243088 MAYFLOWER_EVAL_DES\SUS_001120 WORD PROC\OSM MANUALWERSION 1 IUMYFLOWER O&M PLAN-FINAL-1 1 DOCX 5-5 <br />