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(a) AVBs provide minimal protection and are approved for very low hazard application only. AVBs protect against backsiphonage only and are prohibited where there is potential for backpressure.
(b) The assembly shall be installed a minimum of six inches above the highest use outlet or overflow level downstream from the assembly.
(c) Shutoff valves downstream from the assembly are prohibited.
(d) AVBs shall be allowed only for those applications where there is less than 12 hours per day continuous use.
(e) AVBs shall not be installed in an area subject to flooding or where damage may occur from water discharge.
(f) AVBs shall be allowed for point-of-use protection only in accordance with the plumbing code. AVBs are not recognized as adequate protection by the director, so additional protection may be required.
Atmospheric Vacuum Breaker
Notes:
(1) No control valves or shutoffs allowed downstream.
(2) Install assembly at no more than 60 inches above ground level.
(3) Install assembly at least six inches above highest downstream use piping.
(4) No pumps or backpressure source allowed.
(5) No chemical addition into system allowed.
(Ord. 12274, § 1, passed 11-28-1995)
(a) Air gap separations provide maximum protection from backflow hazards and may be utilized at premises where a substance is handled that would be hazardous to health if introduced into the potable water system.
(b) An air gap separation shall be at least twice the diameter of the supply pipeline measured vertically above the top rim of the receiving vessel, in no case less than one inch. If splashing is a problem, tubular screens may be attached or the supply line may be cut at a 45 degree angle. The air gap distance is measured from the bottom of the angle. Hoses shall not be allowed.
(c) Air gap separations shall not be altered in any way without prior approval from the director, and shall be available for inspection at all reasonable times.
(d) Side walls, ribs or similar obstructions do not affect air gaps when spaced from the inside edge of the spout opening a distance greater than three times the diameter of the effective opening for a single or a distance greater than four times the effective opening for two intersecting walls.
(e) In cases where there are three or more side walls, ribs or similar obstructions extending from the water surface to or above the horizontal plane of the spout opening other than as specified in subsection (d) above, the air gap shall be measured from the top of the wall.
(f) The effective opening shall be the minimum cross-sectional area at the seat of the control valve or the supply pipe or tubing which feeds the assembly or outlet. If two or more lines supply one outlet, the effective opening shall be the sum of the cross-sectional areas of the individual supply lines or the area of the single outlet, whichever is smaller.
Air Gap Separation
Notes:
(1) Provides maximum protection.
(2) The vertical, physical separations must be at least twice the diameter of the inlet pipe but never less than one inch.
(Ord. 12274, § 1, passed 11-28-1995)
An approved double-check valve assembly shall be the minimum protection for fire sprinkler systems using piping material that is not approved for potable water use and/or that does not provide for periodic flow-through during each 24-hour period, unless a variance has been issued in writing from the director. An RP assembly shall be installed if any solution other than the potable water can be introduced into the sprinkler system.
(Ord. 12274, § 1, passed 11-28-1995)
(a) Every person provided water service by the city directly or indirectly shall during the hours of 8:00 a.m. through 5:00 p.m. permit the director to enter their premises and buildings for the purpose of inspecting pipes and fixtures and the manner in which the water is used to determine compliance with this division.
(b) If any water user refuses access to a premises during said times for inspection by an inspector, the water user shall install a reduced pressure principle assembly at the service connection to that premises.
(c) Any temporary or permanent obstruction to safe and easy access to the premises to be inspected shall be promptly removed by the water user at the written or verbal request of the director and shall not be replaced. The costs of clearing such access shall be borne by the user.
(d) A person commits an offense if the person knowingly fails to install a reduced pressure principle assembly in accordance with this subsection (d) after receiving notice from the director to do so.
(Ord. 12274, § 1, passed 11-28-1995)
(a) The director may, without prior notice, suspend water service to any premises when such suspension is necessary to stop an actual or threatened backflow which:
(1) Presents or may present imminent and substantial danger to the environment or to the health or welfare of persons; or
(2) Presents or may present imminent and substantial danger to the city’s public water supply.
(b) As soon as is practicable after the suspension of service, the director shall notify the owner or person in charge of the premises of the suspension in person or by certified mail, return receipt requested, and shall order such person to correct the cross-connection which allowed the backflow to occur. When time permits, the director should also notify the owner or person in charge prior to suspending water service.
(c) If the person fails to comply with an order issued under subsection (b) above, the director may take such steps as the director deems necessary to prevent or minimize damage to the public water supply or to minimize danger to persons.
(d) The director shall not reinstate suspended services until:
(1) The person presents proof, satisfactory to the director, that the backflow has been eliminated and its cause determined and corrected;
(2) The person pays the city for all costs the city incurred in responding to the backflow or threatened backflow; and
(3) The person pays the city for all costs the city will incur in reinstating service.
(e) A person whose service has been suspended may appeal such enforcement action to the director, in writing, within ten days of notice of the suspension in accordance with § 12.5-119 of this chapter.
(f) A person commits an offense if the person reinstates water service to premises suspended pursuant to this section, without the prior approval of the director.
(g) The city may obtain a lien against the property to recover its response, abatement and remediation costs pursuant to the procedure set out in § 12.5-120 of this chapter.
(h) The remedies provided by this section are in addition to any other remedies set out in this chapter. Exercise of this remedy shall not be a bar against, nor a prerequisite for, taking other action against a violator.
(Ord. 12274, § 1, passed 11-28-1995)
(a) The director may terminate the city-provided water supply of any water user who violates the following conditions:
(1) Refusing the director reasonable access to the water user’s premises for the purpose of inspection;
(2) Hindering or denying the director access to backflow prevention assemblies;
(3) Failing to install a reduced pressure principle assembly as required by § 12.5-570;
(4) Failing to install and maintain backflow prevention assemblies in compliance with this division; or
(5) Failing to install, maintain and operate their piping and plumbing systems in accordance with the plumbing code.
(b) The director will notify a water user of the proposed termination of its water supply. The water user may petition the director for a reconsideration and hearing pursuant to § 12.5-119 of this chapter.
(c) Exercise of this enforcement option by the director shall not be a bar to, nor a prerequisite for, taking any other action against the water user.
(d) The director shall not reinstate suspended services until:
(1) The person presents proof, satisfactory to the director, that the backflow has been eliminated and its cause determined and corrected; and
(2) The person pays the city for all costs the city will incur in reinstating service.
(e) A person commits an offense if the person reinstates water service to premises terminated pursuant to this section, without the prior approval of the director.
(Ord. 12274, § 1, passed 11-28-1995)
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