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(11) schools with any of the above hazardous activities; <br /> and <br /> (12) any other commercial or industrial facility that is <br /> deemed by the Utility to pose a contamination <br /> hazard. <br /> Sec . 17-70 . Irrigation systems . <br /> (a) A reduced pressure backflow preventer, an air-gap, or <br /> an approved pressure type vacuum-breaker device shall <br /> be required for the following hazards: <br /> (1) lawn-irrigation systems; <br /> (2) similar lawn-care systems; and <br /> (3) garden hose spigots placed below lawn grade. <br /> Sec. 17-71 . Residential. <br /> (a) A reduced pressure backflow preventer shall be required <br /> for the following hazards : <br /> (1) residents with hot water heat (boilers) ; such <br /> boilers should have, as per the Indiana Plumbing <br /> Code, an expansion tank and or safety valves to <br /> prevent expansion problems; and <br /> (2) any residence with a private auxiliary water supply <br /> connected to the public supply through the user' s <br /> private water supply system. <br /> Sec. 17-72 . Fire service. <br /> No hazardous line shall be attached to any fire hydrant or <br /> other fire service line without an approved backflow <br /> prevention device. Permanent fire service lines shall <br /> incorporate a double check valve assembly in 100% water <br /> systems or a reduced pressure backflow preventer in chemical <br /> systems . Where domestic service is tapped into a fire line, <br /> the domestic tap shall be subject to all the provisions of <br /> this ordinance. <br /> Sec. 17-73 . Pre-existing facilities. <br /> In general, pre-existing backflow preventers will not be <br /> allowed simply because they were approved before the <br /> enactment of this ordinance. The Utility will review the <br /> operation and hazard of each facility with backflow <br /> preventers and determine acceptability based on operability <br /> and present hazard. If the backflow preventers are found <br />