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Monitoring will be performed on the treated water to demonstrate that the filtration <br /> process is working properly and to document the quality of water discharged throughout <br /> each day of operation. The effectiveness of the filter system will be monitored on a <br /> daily basis and recorded on the Filtration System Operations Log by the operator. The <br /> testing and monitoring intervals indicated on the daily log are based on the minimum <br /> requirements in the Department of Ecology BMP C-250 document. In the case of any <br /> out of compliance discharge, the system operator will notify the project Environmental <br /> Manager immediately. <br /> 3.3.2 Automatic Data Logging <br /> The control box collects data points every 15 min. during discharge and include pre- <br /> treatment effluent turbidity and pH, sand filtration effluent turbidity and pH, and the <br /> system flow rate. <br /> City of Everett <br /> EVERETT Reviewed for Permit 10/20/2021 <br /> WASHINGTON <br /> 3.4 Maintenance, Emergency Prevention and Safety <br /> 3.4.1 Freeze Protection <br /> During cold weather the sand filter transfer lines should be drained for freeze <br /> protection. The Chitosan acetate and Water Quality Control box should also be <br /> protected from freezing by maintaining 120v power and running the heater. During <br /> extended periods of extreme cold weather the filter system must be drained to prevent <br /> catastrophic damage to the unit. <br /> 3.4.2 Storage Tanks and Connection Lines <br /> The configuration of the storage and any pre-treatment tanks are set up to collect the <br /> majority of the heavy suspended solids. Sediment build up on the sand filter media is <br /> also back washed with clean treatment system filtrate and routed back to the storage <br /> pond. Over a period of time, sediment will accumulate and require management. <br /> Sediment buildup of more than 25% of the active water level in the storage pond or pre- <br /> treatment should trigger the sediment to be removed. Chitosan will not persist in the <br /> backwash sediments due to its natural and rapid biodegradation, the end products of <br /> which are carbon dioxide and water. <br /> 3.4.3 CESF Pumps <br /> 13 <br />