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<br />5.48 <br />Page 6 <br /> <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 sUNey. <br /> <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 /> <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 /> <br />Sec. 38.39 Installation of Backflow Prevention Assemblies: <br /> <br />A. Where Backflow Prevention Assembly Are Required <br /> <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 /> <br />B. Installation and Permits <br /> <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 /> <br />Section 38.40 <br /> <br />Testing of Backflow Prevention Assemblies: <br /> <br />A. Customer-User Responsibilities: The customer-user shall have the following <br />responsibilities <br /> <br />1. Testing: It shall be the duty of the customer-user at any premises where <br />backflow prevention assemblies are installed to have certified inspections <br />and operational tests made immediately upon the installation, repair or <br />relocation of such assembly and at least once per year thereafter. <br /> <br />ATTY/ORD/ORD.305 <br />041608 <br /> <br />6 <br />