(A) All backflow prevention devices shall be fully approved by the Foundation for Cross-Connection Control and Hydraulic Research, and listed as acceptable by the state as to manufacture, model, size and application. The method of installation of backflow prevention devices shall be approved by the cross-connection control office prior to installation and shall comply with installation criteria set forth by the state’s Cross-Connection Control Manual. Installation shall be at the sole expense of the owner or occupant of the premises.
(B) The type of protective assembly required by this chapter shall depend upon the degree of hazard that exists as follows:
(1) A backflow prevention assembly shall be installed on each fire service line at or near the property line or immediately inside the building being served, but in all cases, before the first branch line leading off the service line wherever any of the following conditions exist:
(a) Class 1 fire protection systems generally shall require a double check detector assembly; provided, however, that, a reduced pressure principle detector assembly shall be required where:
1. Underground fire sprinkler pipelines are parallel to and within ten feet horizontally of pipelines carrying waste water or significantly toxic wastes;
2. Premises have unusually complex piping systems;
3. Pumpers connecting to the system have corrosion inhibitors or other chemicals added to the tanks of the fire trucks;
4. The piping system(s) has corrosion inhibitors or other chemicals added to prevent freezing; or
5. An auxiliary water supply exists within 1,700 feet of any likely pumper connection.
(b) Class 2, Class 3, Class 4, Class 5 and Class 6 fire protection systems shall require an air gap or a reduced pressure principle detector assembly, as determined by the Cross-Connection Coordinator.
(c) Where a fire sprinkler system is installed on the premises, a minimum of a double check detector assembly shall be required.
(d) Where a fire sprinkler system uses chemicals, such as liquid foam, to enhance fire suppression a reduced pressure principle detector assembly shall be required.
(e) The Cross-Connection Coordinator may require internal or additional backflow prevention devices where it is deemed necessary to protect potable water supplies within the premises.
(2) In the case of any premises with an auxiliary water supply as set out in § 18-309(C) of this chapter, and not subject to any of the following rules, the public water system shall be protected by an air gap separation or a reduced pressure principle backflow prevention assembly.
(3) In the case of any premises where there is water or substances that would be objectionable but not hazardous to health if introduced into the public water system, a double check valve assembly shall protect the public water system.
(4) In the case of any premises where there is any material dangerous to health that is handled in such a fashion as may create an actual or potential hazard to the public water system, the public water system shall be protected by an air gap separation or a reduced pressure principle backflow prevention assembly. Premises where such conditions may exist include, but is not limited to, sewage treatment plants, sewage pumping stations, chemical manufacturing plants, hospitals, mortuaries and plating plants.
(5) In the case of any premises where there are uncontrolled cross-connections, either actual or potential, the public water system shall be protected by an air gap separation or a reduced pressure principle backflow prevention assembly at the service connection.
(6) In the case of any premises where, because of security requirements or other prohibitions or restrictions it is impossible or impractical to make a complete cross-connection survey, the public water system shall be protected against backflow from the premises by either an air gap separation or a reduced pressure principle backflow prevention assembly on each service line to the premises.
(7) In the case of any premises where toxic substances are present that could pose an undue health hazard, the general manager or his or her designated representative may require an air gap at the service connection to protect the public water system. In making this determination, the general manager or his or her designated representative shall consider the degree of hazard.
(2011 Code, § 18-310) (Ord. 06-45, passed 9- -2006)