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19 . Section 405. 3 . 1 is amended so that the <br /> sentence of such section reads as <br /> follows • There shall be at least 24 inches <br /> clearance in front of each lavatory, water <br /> closet or bidet to any wall, fixture or door <br /> in any position of swing. <br /> 20 . Section 409. 3 is amended by addition of a <br /> new final sentence to read as follows : The <br /> discharge shall be through an approved air <br /> gap in accordance with section 802 . 2 1 . <br /> 21 . Table 605. 4 is amended by deletion of <br /> references to PB pipe and tubing. <br /> 22 . Table 605. 5 is amended by deletion reference <br /> to PEX, PEX-AL-PEX, and PB pipe and tubing. <br /> 23 . Section 605. 18 is deleted in its entirety. <br /> 24 Section 608. 1 is amended by addition of a <br /> new final sentence to read as follows : All <br /> commercial installations shall have a <br /> reduced pressure principle backflow <br /> preventer as the minimum type of backflow <br /> prevention device . <br /> 25 . Section 610. 1 is amended by addition of a <br /> new number 5 to read as follows : <br /> 5 . When the disinfection of potable water <br /> lines involves the use of 50 pounds or more <br /> of chlorine, the contractor shall notify the <br /> City Public Works Department and receive <br /> approval prior to starting the disinfection <br /> process . <br /> 26 Section 701 . 8 is deleted in its entirety. <br /> 27 Section 705. 14 is amended by addition of a <br /> new subsection 705 . 14 . 7 to read as follows : <br /> 705 14 7 Expansion Joints All expansion <br /> joints shall be installed so as to be <br /> accessible at all times . <br /> 28 Table 706. 3 is amended by deletion of <br /> reference to quarter bends <br /> 29 . Section 709. 1 is amended by deletion of <br /> reference to Table 710 . 1 (2) . <br /> 6 <br />