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f <br /> a) a wetpond or constructed wetland in series with a vegetated swale <br /> b) a wetpond or constructed wetland in series with a SMI StormFilter (see+he <br /> additional criteria for SMI StormFili.ers) <br /> 17. All storm water facilities shall be designed in accordance with City standards, and <br /> should be designed and initially constructed to meet the requirements of all I <br /> planned future expansion on the site. If the storm wafer facilities are not designed <br /> and constructed initially for all phases of the project, the runoff control ' <br /> requirements for future phases of the project shall be those standards in effect at <br /> the time of application for each building permit. <br /> 13. SMI Storm Filter: The Cit}�will allow the use of a Stormwater Management, Inc. <br /> (SMI) StormFilter to help meet the City's storm water treatment standards, <br /> provided the design and construction of the SMI Storm Filter meet the following <br /> criteria: <br /> �,.; The Storm Filter must be preceded by a pretreatment wetvaulUtank <br /> containing at least 30% of the 6-month, 24-hour storm runoff volume from the <br /> contrihuting developed drainage area. <br /> b) The Storm Filter must treat at least the 6-month, 24-hour storm. <br /> c) The Storm Filter shall be designed using a maximum flow rate of 7.6 gpm per <br /> cartridge. Flows exceeding the dec,ign flow shall be bypassed around the system, <br /> but should c�enerally pass :tirough the pretreatment wetvaulUtank. <br /> d) The Storm Filter media shall target d;ssolved pollutants and nutrients as well <br /> as total suspended solids. As more effective media become available in the future, <br /> the Storm Filter shall be upgraded, during routine cartridge replacement, to utilize <br /> these improved media. <br /> e) The Storm Filter shall be designed with a minimum of 2.3 feet of head <br /> differential between the inverts of the inlet and outlet of the filter. Downstream <br /> hydraulic calculations will be performed to demonstrate that downstream <br /> conditions will not reduce the hydraulic potential across the filter due to backwater <br /> effects. <br /> f) Routine maintenance of the Storm Filter is required. A detailed operation and <br /> maintenance plan for the system must be prepared for approval by the City. A <br /> certificate of system maintenance must be submitted to the City annually. <br /> g) Maintenance and operation of the Storm Filter on this site shall be adapted, in <br /> the future, to reflect the current kno�vledge regarding this emerging technology. <br /> �6 <br />