(A) The extent of cross-connection control protection must be commensurate with the degree of hazard present. The best known protection is the air gap separation when properly maintained or the reduced pressure principle backflow device since both offer a high degree of reliability.
(B) All approved reduced pressure backflow valves and double check valves must meet the specifications as set for the University of Southern California Manual of Cross-Connection Control (latest edition), and shall have been fully tested in the laboratory and in the field. Several recognized testing laboratories are available to perform this testing and can provide the necessary certification of testing reliability of the device. A list of approved devices has been established and can be furnished upon request.
(Ord. 86-4, passed 12-1-1986)