(A) The type of protection required shall depend on the degree of hazard which exists as follows:
(1) An approved fixed air gap shall be installed where the public water supply system may be contaminated causing a severe health hazard.
(2) An approved fixed air gap or an approved reduced pressure zone principal backflow prevention device shall be installed where the public water supply system may be contaminated causing a system or health hazard.
(3) An approved fixed air gap separation or an approved reduced pressure zone principal backflow prevention device shall be installed where the public water supply system may be polluted with substances that could cause a pollution hazard dangerous to health.
(B) The type of protection required under this article shall be an approved fixed air gap separation or an approved reduced pressure zone principal backflow prevention device.
(C) Where a public water supply or an auxiliary water supply is used for a fire protection system reduced pressure zone principal backflow preventers shall be installed between the fire sprinkler systems connected to the public water supply system when:
(1) The sprinkler system contains antifreeze or chemical additives or both.
(2) Water maybe pumped into the system from another source or from a nonpotable water supply, or both, or when water can be connected to the sprinkling system.
(D) All backflow prevention devices, methods, installation and maintenance required by this subchapter shall be approved by the Superintendent. Approval shall be based on the Research Foundation for Cross Connection Control of the University of Southern California, American Water Works Association, American Society of Sanitary Engineering or American National Standards Institute or certified by the National Sanitation Foundation to be in compliance with applicable industry specifications. A manufacturer's maintenance manual shall be available on-site.
(Ord. O-97-06, passed 10-27-97)