For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
APPROVED BACKFLOW PREVENTION ASSEMBLY or BACKFLOW ASSEMBLY or ASSEMBLY. An assembly to counteract back pressures or prevent backsiphonage. This ASSEMBLY must appear on the list of approved assemblies issued by the State Health Division.
AUXILIARY SUPPLY. Any water source or system, other than the public water system, that may be available in the building or on the premises.
BACKFLOW. The flow in the direction opposite to the normal flow or the introduction of any foreign liquids, gases or substances into the water system of the city’s water.
BORESIGHT or BORESIGHT TO DAYLIGHT. Providing adequate drainage for backflow prevention assemblies installed in vaults through the use of an unobstructed drain pipe.
CONTAMINATION. The entry into or presence in a public water supply system of any substance which may be deleterious to health and/or quality of the water.
COUNCIL. The City Council of Myrtle Point.
CROSS-CONNECTION. Any physical arrangement where a public water system is connected, directly or indirectly, with any other water system or auxiliary system, sewer, drain conduit, swimming pool, storage reservoir, plumbing fixture, swamp cooler or any other device which contains, or may contain, contaminated water, sewage or other liquid of unknown or unsafe quality which may be capable of imparting contamination to the public water system as a result of backflow. Bypass arrangements, jumper connections, removable sections, swivel or changeover devices or other temporary or permanent devices through which, or because of which, backflow may occur are considered to be CROSS-CONNECTIONS.
DEGREE OF HAZARD. The low or high hazard classification that shall be attached to all actual or potential cross-connections.
DOUBLE CHECK VALVE BACKFLOW PREVENTION ASSEMBLY or DOUBLE CHECK ASSEMBLY or DOUBLE CHECK. An assembly which consists of two independently operating check valves which are spring-loaded or weighted. The assembly comes complete with a shut-off valve on each side of the checks, as well as test cocks to test the checks for tightness.
HEALTH HAZARD. An actual or potential threat of contamination of a physical or toxic nature to the public potable water system or the consumer’s potable water system that would be a danger to health.
HIGH HAZARD. The classification assigned to an actual or potential cross-connection that potentially could allow a substance that may cause illness or death, to backflow into the potable water supply.
LOW HAZARD. The classification assigned to an actual or potential cross-connection that potentially could allow a substance that may be objectionable, but not hazardous to one’s health, to backflow into the potable water supply.
PLUMBING HAZARD. An internal or plumbing-type cross-connection in a consumer’s potable water system than may be either a pollutional or a contamination-type hazard. This includes, but is not limited to, cross-connections to toilets, sinks, lavatories, wash trays, domestic washing machines and lawn sprinkling systems. Plumbing-type cross-connections can be located in many types of structures including homes, apartment houses, hotels and commercial or industrial establishments.
POINT-OF-USE ISOLATION. The appropriate backflow prevention within the consumer’s water system at the point at which the actual or potential cross-connection exists.
POLLUTIONAL HAZARD. An actual or potential threat to the physical properties of the water system or the potability of the public or the consumer’s potable water system but which would not constitute a health or system hazard, as defined. The maximum degree of intensity of pollution to which the potable water system could be degraded under this definition would cause a nuisance or be aesthetically objectionable or could cause minor damage to the system or its appurtenances.
POTABLE WATER SUPPLY. Any system of water supply intended or used for human consumption or other domestic use.
PREMISES. Any piece of property to which water is provided, including all improvements, mobile structures and structures located on it.
PREMISES ISOLATION. The appropriate backflow prevention at the service connection between the public water system and the water user.
REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION ASSEMBLY or REDUCED PRESSURE PRINCIPLE ASSEMBLY or RP ASSEMBLY. An assembly containing two independently acting approved check valves together with a hydraulically-operated, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. The assembly shall include properly located test cocks and tightly closing shut off valves at the end of the assembly.
SYSTEM HAZARD. An actual or potential threat of severe danger to the physical properties of the public or consumer’s potable water system or of a pollution or contamination which would have a detrimental effect on the quality of the potable water in the system.
THERMAL EXPANSION. Heated water that does not have the space to expand.
(Ord. 1195, passed 8-3-1998)