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City of Everett <br /> EVERETT Reviewed for Permit 10/20/2021 <br /> WASHINGTON <br /> 2 Water Treatment System Design and Components <br /> Water will be collected from the various sources within the work area and conveyed to <br /> the designated storage system using portable sump pumps and temporary overland <br /> pipes. The Storage tanks, along with the CESF Treatment System will be configured to <br /> allow a number of different operational modes, based on the water volumes, sources <br /> and quality being collected on a given day. The main tanks will store up to 50,000 <br /> gallons and the adjacent CESF system will have an operational flow rate of 500 GPM. <br /> 2.1 Chitosan Enhanced Sand Filtration System <br /> 2.1.1 CESF Pump <br /> The CESF system requires a pump that can deliver a minimum operational flow rate of <br /> 500 gpm at 12 feet of total dynamic head in order to produce up to 60 pounds per <br /> square inch (psi) of pressure to the sand filter. A 6" Diesel pump will be selected for filter <br /> system applications (depending on the desired flow rate) and will be set up at the far <br /> end of the storage tank inlet. A valve on the inlet side of the water quality monitoring <br /> box, along with the pump RPMs will control the overall filter system flow rate. A <br /> pressure compensating valve on the outlet side of the sand filters will control the overall <br /> filter system pressure across the sand filter bed. The pump will be manually started and <br /> stopped. <br /> 2.1.2 Water Quality Monitoring Box <br /> The Water Quality Monitoring Box (WQMB) used for this project will meet Washington <br /> Department of Ecology standards in BMP C-250 for chemical storm water treatment as <br /> well as the DOE General Use Level Designation for StormKlear 1% and includes the <br /> following: <br /> • Water tight, lockable, secure structure <br /> • 6" flanged inlet and outlet ports w/ sampling stations <br /> • Lighted interior <br /> 7 <br />