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Maintenance checklists are provided for the following types of facilities/structures: <br /> • Closed Detention Systems <br /> • Control Structure/Flow Restrictor <br /> • Catch Basin <br /> The following are additional inspection and maintenance requirements applies to the <br /> orifice extension element to protect the orifice from buildup of sediment and <br /> biological material: <br /> • Inspection monthly and after rain events exceeding 1" in 24 hours. <br /> • Annually remove orifice and extension to check and clean any buildup of <br /> sediment and biological material in stones. <br />