§ 18-301 DEFINITIONS.
   For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   AIR GAP. A physical separation between the free flowing discharge end of a potable water supply line and an open or non-pressurized receiving vessel. An APPROVED AIR GAP shall be a distance at least double the diameter of the supply pipe when measured vertically above the overflow rim of the vessel, but in no case less than one inch.
   APPROVED DEVICE OR METHOD. A backflow prevention device or method accepted by the state’s Department of Environment and Conservation, Water Supply, and the city’s Water and Sewerage System.
   AUXILIARY INTAKE. Any piping connection or other device whereby water may be secured from any sources other than from the public water system.
   AUXILIARY WATER SUPPLY. Any water supply on or available to the premises other than water supplied by the public water system.
   BACKFLOW. The reversal of the intended direction of flow of water or mixtures of water and other liquids, gases or other substances into the distribution pipes of a potable water system from any source.
   BACK PRESSURE. A pressure in downstream piping, higher than the supply pressure.
   BACK SIPHONAGE. Negative or sub-atmospheric pressure in the supply piping.
   BACKFLOW PREVENTION ASSEMBLY. A device designed to prevent backflow.
   BYPASS. Any system of piping or other arrangement whereby water may be diverted around a backflow prevention assembly, meter or any other city controlled device.
   CONTAMINATION. The introduction or admission of any foreign substance that degrades the quality of a potable water supply or creates a health hazard.
   CROSS-CONNECTION. Any physical arrangement whereby public water supply is connected, directly or indirectly, either inside or outside of a building, with any other water supply whether public or private, sewer, drain, conduit, pool, storage reservoir, plumbing fixture or other device which contains or may contain contaminated water, sewage or other waste, liquid, gas or solid, of unknown or unsafe quality which may be capable of contaminating the public water supply as a result of backflow caused by the manipulation of valves, because of ineffective check valves or back pressure valves, or because of any other arrangement.
   CROSS-CONNECTION COORDINATOR. That person who is vested with the authority and responsibility for the implementation of the cross-connection control program and for the enforcement of the provisions of this chapter.
   CUSTOMER. Any natural or artificial person, business, industry or governmental entity that obtains water, by purchase or without charge, from the city’s Water System.
   DOUBLE CHECK DETECTOR ASSEMBLY. A specially designed assembly composed of a line size approved double check valve assembly, with a bypass containing a water meter and approved double check valve assembly specifically designed for such application. The meter shall register accurately for very low rates of flow up to three gallons per minute and shall show a registration for all rates of flow. This ASSEMBLY shall only be used to protect against non-health hazards and is designed primarily for use on fire sprinkler systems.
   DOUBLE CHECK VALVE ASSEMBLY.
      (1)   An assembly of two internally loaded check valves, either spring loaded or internally weighted, installed as a unit between two tightly-closing resilient seated shutoff valves and fitted with properly located resilient seated test cocks.
      (2)   This type of device shall only be used to protect against non-health hazard pollutants.
   FIRE SYSTEM CLASSIFICATIONS PROTECTION. The classes of fire protection systems, as designated by the American Water Works Association Manual M14 for cross-connection control purposes based on water supply source and the arrangement of supplies, are as follows.
      (1)   CLASS 1. Direct connection to the public water main only; no pumps, tanks or reservoirs; no physical connection from other water supplies; no antifreeze or other additives of any kind; all sprinkler drains discharging to the atmosphere, dry well or other safe outlets.
      (2)   CLASS 2. Same as Class 1, except booster pumps may be installed in connection from the street mains.
      (3)   CLASS 3. Direct connection to public water supply mains in addition to any one or more of the following: elevated storage tanks; fire pumps taking suction from above ground covered reservoirs or tanks; and pressure tanks.
      (4)   CLASS 4. Directly supplied from public water supply mains, similar to Class 1 and Class 2, with an auxiliary water supply dedicated to Fire Department use and available to the premises, such as an auxiliary supply located within 1,700 feet of the pumper connection.
      (5)   CLASS 5. Directly supplied from public water supply mains and interconnection with auxiliary supplies such as pumps taking suction from reservoirs exposed to contamination, or from rivers, ponds, wells or industrial water systems; where antifreeze or other additives are used.
      (6)   CLASS 6. Combined industrial and fire protection systems supplied from the public water mains only, with or without gravity storage or pump suction tanks.
   GENERAL MANAGER. General manager of the city’s Water and Sewerage System.
   HAZARD, DEGREE OF. A term derived from evaluation of the potential risk to public health and the adverse effect of the hazard upon the public water system.
   HAZARD, HEALTH. A cross-connection or potential cross-connection involving any substance that could, if introduced in the public water supply, cause death, illness or spread disease.
   HAZARD, NON-HEALTH. A cross-connection or potential cross-connection involving any substance that would not be a health hazard, but would constitute a nuisance or be aesthetically objectionable if introduced into the public water supply.
   HAZARD, PLUMBING. A cross-connection in a customer’s potable water system plumbing that is not properly protected by an approved air gap or backflow prevention assembly.
   INDUSTRIAL FLUID. Any fluid or solution that may be chemically, biologically or otherwise contaminated or polluted in a form or concentration that could constitute a health, system, pollution or plumbing hazard if introduced into the public water supply. This shall include, but is not limited to: polluted or contaminated water; all types of process water or used water originating from the public water system and that may have deteriorated in sanitary quality; chemicals; plating acids and alkalis; circulating cooling water connected to an open cooling tower; cooling towers that are chemically or biologically treated or stabilized with toxic substance; contaminated natural water systems; oil, gases, glycerin, paraffin, caustic and acid solutions, and other liquids or gases used in industrial processes, or for fire purposes.
   INTER-CONNECTION. Any system of piping or other arrangement whereby a public water supply is connected directly with a sewer, drain, conduit or other device which does, or may, carry sewage or other liquid or waste which would be capable of imparting contamination to the public water supply.
   POLLUTION. The presence of a foreign substance in water that degrades its quality so as to constitute a health or non-health hazard or impair the usefulness of water.
   POTABLE WATER. Water that is safe for human consumption as prescribed by the state’s Department of Environment and Conservation.
   PRESSURE VACUUM BREAKER. An assembly consisting of one or two independently operating spring loaded check valve(s) and an independently operating spring loaded air inlet valve located on the discharge side of the check valve(s), with tightly closing shutoff valve(s) on each side of the check valves and properly located test cocks for testing the check valves.
   PUBLIC WATER SUPPLY. The city’s Water System, which furnishes potable water to the city for general use and which is recognized as the public water supply by the state’s Department of Environment and Conservation, Water Supply.
   PUBLIC WATER SYSTEM. A water system furnishing water to the public for general use which is recognized as a public water supply by the state.
   REDUCED PRESSURE PRINCIPLE ASSEMBLY. An assembly consisting of two independently acting approved check valves together with hydraulically operating, mechanically independent, pressure differential relief valve located between the check valves and below the first check valve. These units shall be located between two tightly-closing resilient seated shutoff valves as an assembly and equipped with properly located resilient seated test cocks.
   REDUCED PRESSURE PRINCIPLE DETECTOR ASSEMBLY. A specially designed assembly composed of a line-size approved reduced pressure principle backflow prevention assembly with a bypass containing a water meter and approved reduced pressure principle backflow prevention assembly specifically designed for such application. The meter shall register accurately for very low rates of flow up to three gallons per minute and shall show registration for all rates of flow. This ASSEMBLY shall only be used to protect against non-health hazard or a health hazard.
   SERVICE CONNECTION. The point of delivery to the customer’s water system; the terminal end of a service connection from the public water system where the water department loses jurisdiction and control over the water. SERVICE CONNECTION shall include connections to fire hydrants and all other temporary or emergency water service connections made to the public water system.
   STATE. The State of Tennessee or the state’s Department of Environment and Conservation, Bureau of Environment, Division of Water Supply.
   WATER SYSTEM. The water system operated by the city, whether located inside or outside the corporate limits thereof, shall be considered as made up of two parts, the utility system and the customers system:
      (1)   The utility system shall consist of the facilities for the production, treatment, storage and distribution of water, and shall include all those facilities of the water system under the complete control of the Water Department, up to the point where the customer’s system begins (i.e., the water meter); and
      (2)   The customer system shall include those parts of the facilities beyond the termination of the Water Department distribution system that are utilized in conveying water to point of use.
(2011 Code, § 18-301) (Ord. 06-45, passed 9- -2006)