For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
APPROVED AIR GAP (AG). A physical separation between the free-flowing discharge end of a potable water supply pipeline and an open or non-pressurized receiving vessel. An APPROVED AIR GAP shall be at least twice the diameter of the supply pipe measured vertically above the overflow rim of the vessel and in no case less than 1 inch (2.54 cm), and in accord with Oregon Plumbing Specialty Code.
ATMOSPHERIC VACUUM BREAKER (AVB). A non-testable device consisting of an air inlet valve or float check, a check seat and an air inlet port(s). This device is designed to protect against a non-health hazard or a health hazard under a backsiphonage condition only. Product and material approval is under the Oregon Plumbing Specialty Code.
BACKFLOW. The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from any sources other than its intended source, and is caused by backsiphonage or backpressure.
BACKFLOW PREVENTER. A device, assembly or method to prevent backflow into the potable water system.
BACKFLOW PREVENTION ASSEMBLY. A backflow prevention assembly such as a pressure vacuum breaker backsiphonage prevention assembly, spill-resistant pressure vacuum breaker backsiphonage prevention assembly, double check valve backflow prevention assembly, double check-detector backflow prevention assembly, reduced pressure principle backflow prevention assembly, or reduced pressure principle-detector backflow prevention assembly and the attached shutoff valves on the inlet and outlet ends of the assembly, assembled as a complete unit.
BACKPRESSURE. An elevation of pressure downstream of the distribution system that means a drop in distribution system pressure below atmospheric would cause, or tend to cause, water to flow opposite of its intended direction.
BACKSIPHONAGE. Pressure (partial vacuum), that would cause, or tend to cause, water to flow opposite of its intended direction.
CHECK VALVE. A valve, which allows flow in only 1 direction.
CONTAMINANT. Any physical, chemical, biological, or radiological substance or matter in water that creates a health hazard.
CONTINGENCY PLAN. A document setting out an organized, planned and coordinated course of action to be followed in the event of a loss of capacity to supply water to the distribution system or in case of a fire, explosion or release of hazardous waste which could threaten human health or the environment.
CROSS CONNECTION. Any actual or potential unprotected connection or structural arrangement between the city or user's potable water system and any other source or system through which it is possible to introduce into any part of the potable system any used water, industrial fluid, gas, or substances other than the intended potable water with which the system is supplied. Bypass arrangements, jumper connections, removable sections, swivel, or change-over devices, and other temporary or permanent devices through which, or because of which, backflow can occur are considered to be cross connections.
DEGREE OF HAZARD. Either pollution (non-health hazard) or contamination (health hazard) and is determined by an evaluation of hazardous conditions within a system.
DEPARTMENT. The Oregon Department of Human Services (DHS).
DOUBLE CHECK-DETECTOR BACKFLOW PREVENTION ASSEMBLY (DCDA). A specially designed assembly composed of a line size approved double check valve assembly assembled with a bypass containing a specific water meter and an approved double check valve assembly. The meter shall register accurately for only very low rates of flow up to 3 gallons per minute and shall show a registration for all rates of flow. This assembly is designed to protect against a non-health hazard.
DOUBLE CHECK VALVE BACKFLOW PREVENTION ASSEMBLY (DC). An assembly of 2 independently acting approved check valves, including tightly closing resilient seated shutoff valves attached at each end of the assembly and fitted with properly located resilient seated test cocks. This assembly is designed to protect against a non-health hazard.
PERSON. Any individual, corporation, association, firm, partnership, municipal, state or federal agency, or joint stock company and includes any receiver, special master, trustee, assignee, or other similar representative thereof.
POINT OF DELIVERY (POD). The point of connection between the city water system and the user's water system. Beyond the point of delivery, the Oregon Plumbing Specialty Code applies. See SERVICE CONNECTION.
POLLUTANT. A substance that creates an impairment of the quality of the water to a degree which does not create a hazard to the public health, but which does adversely affect the aesthetic qualities of the water.
POTABLE WATER. Water which has sufficiently low concentrations of microbiological, inorganic chemical, organic chemical, radiological or physical substances so that individuals drinking such water at normal levels of consumption, will not be exposed to disease organisms or other substances which may produce harmful physiological effects.
POTENTIAL CROSS CONNECTION. A cross connection that would most likely occur, but may not be taking place at the time of an inspection.
PREMISE. Real estate and the structures on it.
PREMISE ISOLATION. The practice of protecting the city water supply from contamination or pollution by installing backflow prevention assemblies at, or near, the point of delivery where the water supply enters the premise. Premise isolation does not guarantee protection to persons on the premise.
PRESSURE VACUUM BREAKER BACK- SIPHONAGE PREVENTION ASSEMBLY (PVB). An assembly consisting of an independently operating, internally loaded check valve and an independently operating loaded air inlet valve located on the discharge side of the check valve. This assembly is to be equipped with properly located resilient seated test cocks and tightly closing resilient seated shutoff valves attached at each end of the assembly. This assembly is designed to protect against a non-health hazard or a health hazard under backsiphonage conditions only.
PUBLIC WATER SYSTEM. The city water system.
REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION ASSEMBLY (RP). An assembly containing 2 independently acting approved check valves, together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. The unit shall include properly located resilient seated test cocks and tightly closing resilient seated shutoff valves at each end of the assembly. This assembly is designed to protect against a non-health hazard or a health hazard.
REDUCED PRESSURE PRINCIPLE-DETECTOR BACKFLOW PREVENTION ASSEMBLY (RPDA). A specifically designed assembly composed of a line size approved reduced pressure principle backflow prevention assembly with a bypass containing a specific water meter and an approved reduced pressure principle backflow prevention assembly. The meter shall register accurately for only very low rates of flow up to 3 gallons per minute and shall show a registration for all rates of flow. This assembly is designed to protect against a non-health hazard or a health hazard.
SERVICE CONNECTION. The piping connection by means of which water is conveyed from a distribution main of the city system to a user's premise. For the city, the portion of the service connection that conveys water from the distribution main to the user's property line, or to the service meter, where provided, is under the jurisdiction of the city.
(Ord. 2007-11-04, passed 11-13-2007)