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14.16.050 When such a condition becomes known, the operations services director shall deny or immediately discontinue service to the premises by providing for a physical break in the service line until the customer has corrected the conditions in conformance with state and city statutes relating to plumbing and water supplies and the regula- tions adopted pursuant thereto. C. An approved backflow prevention device shall also be installed on each service line to a cus- tomer's water system in all cases, before the first branch line leading off the service line wherever the following conditions exist: I. In the case of premises having an auxiliary water supply which is not or may not be of safe bacterio- logical or chemical quality and which is not acceptable as an additional source by the operations services direc- tor, the public water system shall be protected against backflow from the premises by installing a backflow prevention device in the service line appropriate to the degree of hazard. 2. In the case of premises on which any indus- trial fluids or any other objectionable substance is han- dled in such a fashion as to create an actual or potential hazard to the public water system, the public system shall be protected against backflow from the premises by installing a backflow prevention device in the service line appropriate to the degree of hazard. This shall in- clude the handling of processed waters and waters origi- nating from the utility system which have been subject to deterioration in quality. 3. In the case of premises having (a) internal cross- connections that cannot be permanently corrected and controlled, or (b) intricate plumbing and piping ar- rangements or where entry to all portions of the prem- ises is not readily accessible for inspection purposes, making it impracticable or impossible to ascertain whether or not dangerous cross - connections exist, the public water system shall be protected against backflow from the premises by installing a backflow prevention device in the service line. D. The type of protective device required under subsections (C)(1), (2) and (3) of this section shall de- pend upon the degree of hazard which exists as follows: 1. In the case of any premises where there is an auxiliary water supply as stated in subsection (C)(I) of this section and it is not subject to any of the following rules, the public water system shall be protected by an approved air -gap separation or an approved reduced pressure principle backflow prevention device. 2. In the case of any premises where there is water or substance that would be objectionable but not hazardous to health, if introduced into the public water (Pleasanlon Snpp. No 3, 1 -10) 388 system, the public water system shall be protected by an approved double check valve assembly. 3. In the case of any premises where there is any material dangerous to health which is handled in such a fashion as to create an actual or potential hazard to the public water system, the public water system shall be protected by an approved air -gap separation or an approved reduced pressure principle backflow preven- tion device. Examples of premises where these condi- tions will exist include chemical manufacturing plants, hospitals, mortuaries and plating plants. 4. In the case of any premises where there are "uncontrolled" cross - connections, either actual or poten- tial, the public water system shall be protected by an approved air -gap separation or an approved reduced pressure principle backflow prevention device at the service connection. 5. In the case of any premises where, because of security requirements or other prohibitions or restric- tions it is impossible or impractical to make a complete in -plant cross - connection survey, the public water sys- tem shall be protected against backflow or back - siphonage from the premises by the installation of a backflow prevention device in the service line. In this case, maximum protection will be required; that is, an approved air -gap separation or an approved reduced pressure principle backflow prevention device shall be installed in each service to the premises. 6. In the case of premises with cross - connections to sewage lines, pumps, flushers, etc., the public water system shall be protected by an approved air -gap separation or an approved reduced pressure prin- ciple backflow prevention device. Examples include sewage treatment plants and pumping stations. 7. In the case of tanker and spray tanks of forty -nine gallons or more, air -gap separation or an ap- proved reduced pressure principle backflow prevention device is required. E. Any backflow prevention device required in this chapter shall be of a model and size approved by the operations services director. The term "approved back- flow prevention device" means a device that has been manufactured in full conformance with the standards established by the American Water Works Association (AWWA) entitled: AWWA C506 -78 Standards for Reduced Pressure Principle and Double Check Valve Back - flow Prevention Devices: and, have met completely the laboratory and field performance specifications of the Foundation for Cross-