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06/09/2008 <br /> sewage pumping stations, chemical manufacturing plants, <br /> hospitals, mortuaries, and plating plants. <br /> c. In the case of any premises where there are cross connections, <br /> either actual or potential. <br /> d. In the case of any premises where, because of security <br /> requirements or other prohibitions or restrictions, it is impossible or <br /> impractical to make a complete in-plant cross connection survey. <br /> 2. In the case of any premises where there is water or substance that would <br /> be objectionable but not hazardous to health, if introduced into the public <br /> water system, the public water system shall be protected by an approved <br /> double check valve assembly. <br /> 3. In the case of any premises where, in the opinion of the Director, an <br /> undue health threat is posed because of the presence of extremely toxic <br /> substances, the Director may require an air gap at the service connection <br /> to protect the public water system. This requirement will be at the <br /> discretion of the Director and is dependent of the degree of hazard. <br /> Sec. 38.39 Installation of Backflow Prevention Assemblies: <br /> A. Where Backflow Prevention Assembly Are Required <br /> In addition to the requirements of Article VII (Plumbing Code) of Chapter 9 of this <br /> Code and all amendments thereto, an approved backflow prevention assembly <br /> shall be installed on each service line to a customer-user's water system at or as <br /> near possible the terminal end of the service connection from the City water <br /> system or immediately inside the building being served; but in all cases, before <br /> the first branch line leading off the service line. <br /> B. Installation and Permits <br /> Every backflow prevention assembly installed for the purpose of eliminating a <br /> cross-connection shall be so installed with all applicable City permits, in <br /> accordance with City standards, and at a location approved by the Director. The <br /> approval required hereunder shall be in addition to all applicable requirements of <br /> Title 17 of the California Administrative Code and Article VII (Plumbing Code) of <br /> Chapter 9 of this Code and all amendments thereto. <br /> Section 38.40 Testing of Backflow Prevention Assemblies: <br /> A. Customer-User Responsibilities: The customer-user shall have the following <br /> responsibilities <br /> ATTY/ORD/ORD.305 ORD.2331 <br /> 041608 6 FORMERLY MUFF#802 <br />