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DESIGN AND CONSTRUCTION STANDARDS AND SPECIFICATIONS <br />The last drainage structure in a stormwater only system prior to connection to any facility which may <br />contain sanitary sewage shall include a gas trap in accordance with Standard Drawing 413 or 414. <br />No connections of roof drains to side sewers or laterals shall be allowed without prior approval of the <br />Director. Downspouts may be discharged to the ground surface, using splash blocks or other means. <br />Stormwater runoff shall not be connected directly to sanitary side sewers. Projects that discharge <br />stormwater to the combined sewer system shall connect to the sewer main using a separate storm side <br />sewer. Stormwater runoff shall be discharged to a floatable material separator with gas trap, per Standard <br />Drawing 413 or 414, prior to the connection to the combined system sewer main. <br />6-10.2 (2) COMBINED SEWER CONVEYANCE SIZING <br />New combined sewer mains will be sized by Public Woks staff based on internal design standards and <br />modeling methodologies. <br />Stormwater only elements of the combined sewer system shall be designed in accordance with Section 4- <br />2.2 <br />SANITARY SEWERS 6-17 <br />