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next upstream manhole and/or flushing inlet cover at the public or private sewer <br /> system serving such drainage piping shall be protected from backflow of sewage <br /> by installing an approved type backwater valve. Fixtures above such elevation <br /> shall not discharge through the backwater valve, unless first approved by the <br /> Administrative Authority." <br /> "Section 9.86. Section 715.1 of the Plumbing Code is hereby amended <br /> to read as follows: <br /> "Section 715.1. (a) The building sewer, beginning two (2) feet (./6m) <br /> from any building or structure, shall be of such materials as may be approved by <br /> the Administrative Authority under the approval procedures set forth in Chapter 3 <br /> of this Code. Metallic piping shall not be used underground in those areas <br /> underlain by younger bay mud (see map published by Redwood City Building <br /> Division for approximate locations)." <br /> "Section 987. Section 719 of the Plumbing Code is hereby amended to <br /> read as follows: <br /> "Section 719.0. Cleanouts. <br /> "Section 719.1. Cleanouts shall be placed inside the building near the <br /> connection between the building drain and the building sewer or installed outside <br /> the building at the lower end of the building drain and extended to grade. <br /> ORD-001 20 <br /> FXS:rg <br /> 10/23/95 <br /> 11/13/95R <br />