Any backflow prevention assembly required by this chapter shall be a model approved by the public works director. A double check valve assembly or a reduced pressure principle backflow prevention assembly will be approved if it has successfully passed performance tests of the University Of Southern California Foundation For Cross Connection Control And Hydraulic Research, or other testing laboratories satisfactory to the state and the city public works department. Backflow prevention assemblies which are already in service as of the effective date of this chapter but are not listed shall be permitted to remain in service provided they:
A. Were listed on the current approved cross connection control assembly list at the time they were installed;
B. Are properly maintained;
C. Are commensurate with the degree of hazard; and
D. Are tested and successfully pass the test annually.
When these assemblies are moved or require more than minimum maintenance, they shall be replaced by an assembly that is on the current list of approved assemblies. To maintain their approval status, all assemblies must be delivered to the job site and be installed with the shutoff valves #1 and #2 and test cocks which are supplied by the device manufacturer. (Ord. 452, 1-7-2014)