13.10.010 Definitions.
“Approved backflow prevention assembly” or “backflow assembly” or “assembly” means an assembly to counteract back pressure or prevent back siphonage. This assembly must appear on the list of approved assemblies issued by the Oregon Health Division.
Types:
1. Air Gap. A physical separation between the free-flowing discharge end of a potable water supply piping and/or appurtenance and an open or non-pressure-receiving vessel, plumbing fixture or other device. An “approved air-gap separation” shall be at least double the diameter of the supply pipe measured vertically above the overflow rim of the vessel, plumbing fixture or other device, in no case less than one inch.
2. Reduced Pressure Principle Backflow Prevention Assembly or Reduced Pressure Principle Assembly or RP Assembly or RP. 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 inlet and outlet ends of the assembly.
3. Reduced Pressure Principle Detector Backflow Prevention Assembly or Reduced Pressure Detector or RPDA. An assembly composed of a line-size approved, reduced pressure principle assembly with a bypass containing a specific water meter and an approved reduced pressure principle backflow prevention assembly in accordance with OAR 333-061-0070. The meter shall register accurately in cubic feet for very low rates of flow.
4. Double Check Detector Backflow Prevention Assembly or Double Check Detector Assembly or DCDA. An assembly composed of a line-size approved double check assembly with a bypass containing a specific water meter and an approved double check valve assembly in accordance with OAR 333-061-0070. The meter shall register accurately in cubic feet for very low rates of flow.
5. Double Check Valve Backflow Prevention Assembly or Double Check Assembly or Double Check or DC. 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.
6. Pressure Vacuum Breaker Backflow Prevention Assembly or Pressure Vacuum Breaker or PVB. An assembly which provides protection against back siphonage, but does not provide adequate protection against back pressure backflow. The assembly is a combination of a single check valve with an air inlet valve and can be used with downstream shut-off valves. In addition, the assembly has suction and discharge shut-off valves and test cocks which allow the full testing of the assembly.
“Auxiliary water supply” means any water source other than the public water system, including irrigation water sources.
“Back pressure” means any elevation of pressure in the downstream piping system above the supply pressure at the point of consideration which would cause, or tend to cause, a reversal of the normal direction of flow and the introduction of fluids, mixtures or substances from any source other than the intended source.
“Back siphonage” means the flow of water or other liquids, mixture or substances into the distribution pipes of a potable water supply system from any source other than its intended source caused by a sudden reduction of pressure in the potable water supply system.
“Backflow” means the flow in the direction opposite to the normal flow or the introduction of any foreign liquids, gases, or substances into the city’s water system.
“Boresight” or “boresight to daylight” means providing adequate drainage for backflow prevention assemblies installed in vaults through the use of an unobstructed drain pipe.
“BPA” means any backflow prevention assembly approved by city rules, regulations or ordinances, or OAR 333-061-0070.
“City” means the city of Talent, Oregon, or its designee.
“City water system” means the system, owned and operated by the city of Talent, for providing piped water for human consumption to the public.
“Confined space” means an area that has limited entry and exit, is large enough for a person to enter, and was not designed for continuous occupancy.
“Contamination” means the entry or presence in a public water supply system of any substance which may be harmful to health or the quality of the water.
“Cross-connection” means any unprotected actual or potential (direct or indirect) connection or physical arrangement through which it is possible to introduce into any part of the drinking water system any used water or substance other than the intended potable water.
“Degree of hazard” means the low or high hazard classification that shall be attached to all actual or potential cross-connections.
1. High Hazard. The classification assigned to an actual or potential cross-connection where a substance which, if allowed to backflow into the city water system, could cause illness or death.
2. Low Hazard. The classification assigned to an actual or potential cross-connection that could allow a substance which, if allowed to backflow into the city water system, could be objectionable but not dangerous to one’s health.
“Mobile units” means any mobile equipment that uses water obtained through the city water system. Mobile units include but are not limited to carpet-cleaning vehicles, water-hauling vehicles, street-cleaning vehicles that use water, portable toilet-hauling and water-service vehicles and septic tank cleaning vehicles that use water.
“Nonresidential use” means all uses not specifically included in residential uses defined below.
“Point of use isolation” means the appropriate backflow prevention within the consumer’s water system at the point where the actual or potential cross-connection exists.
“Premises” means any property to which water is provided, including but not limited to all improvements, mobile homes, and any other structures thereon.
“Premises isolation” means the appropriate backflow prevention at the service connection between the public water system and the water user.
“Public works” means the public works department of the city of Talent responsible for operation and maintenance of the Talent public water system.
“Representative of the city” means a person designated by the city of Talent to perform cross-connection control duties that shall include, but not be limited to, cross-connection inspections and water-use surveys.
“Residential use” shall include, but is not limited to, single-family dwellings, duplexes, multiplexes, housing and apartments where the individual units are each on a separate meter; or where two or more units are served by one meter and the units are full-time dwellings.
“Service connection” means the portion of the water system that conveys water from the distribution main to the outlet side of the meter, or the inlet side of the BPA, whichever occurs first.
“Tester” means a person certified as a backflow prevention assembly tester and registered with the Oregon State Department of Health.
“Used water” means water supplied by the city water system to a water user’s system which has passed through a service connection or meter. [Ord. 649 § 1.]