For the purpose of this chapter the following definitions shall apply unless the context clearly indicates or requires a different meaning.
"AIR GAP SEPARATION." A physical break between a supply pipe and a receiving vessel. The air gap shall be at least double the diameter of the supply pipe measured vertically above the top rim of the vessel, and in no case less than one inch.
"APPROVED CHECK VALVE." A check valve that seats readily and completely. It must be carefully machined to have free-moving parts and assured watertightness. The face of the closure element and valve seat must be of bronze composition or other noncorrodible material which will seat tightly under all prevailing conditions of field use. Pins and bushings shall be of bronze or other noncorrodible, nonsticking material, machined for easy, dependable operation. The closure element (that is, the clapper) shall be internally weighted or otherwise internally equipped to promote rapid and positive closure in all sizes where this feature is obtainable.
"APPROVED DOUBLE CHECK VALVE ASSEMBLY." An assembly of at least two independently acting approved check valves including tightly closing shutoff valves on each side of the check valve assembly and suitable leak detector drains plus connections available for testing the watertightness of each check valve. Unless otherwise authorized by the Director of Public Works, a pressure relief valve, rated at no more than 50 psi greater than the water service pressure, shall be installed on the downstream side of the double check valve assembly.
"APPROVED REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION DEVICE." A device incorporating two or more check valves and an automatically operating differential relief valve located between the two checks, two shutoff valves, and equipped with necessary appurtenances for testing. The device shall operate to maintain the pressure in the zone between the two check valves less than the pressure on the public water supply side of the device. At cessation of normal flow the pressure between the check valves shall be less than the supply pressure. In case of leakage of either check valve, the differential relief valve shall operate to maintain this reduced pressure by discharging to the atmosphere. When the inlet pressure is two pounds per square inch or less, the relief valve shall open to the atmosphere thereby providing an air gap in the device. To be approved, these devices must be readily accessible for maintenance and testing and installed in a location where no part of the device will be submerged. Unless otherwise authorized by the Director of Public Works, a pressure relief valve rated at no more than 50 psi greater than the water service pressure shall be installed on the downstream side of the reduced pressure principle flow prevention device.
"APPROVED WATER SUPPLY." Any water supply approved by or under the public supervision of the Director of Public Works. In determining what constitutes an approved water supply, the Director shall have the final judgment as to its safety and potability.
"AUXILIARY WATER SUPPLY." Any water supply on or available to the premises other than the village water supply.
"WATER SUPPLY OF VILLAGE." An approved water supply sold and delivered to consumers' premises through the waterworks system of the village.
"CONSUMER." Any person to whom water is sold and furnished from the village water supply by the village.
"CONTAMINATION." An impairment of the quality of the village water supply by the presence of any foreign substance (organic, inorganic, radiological, or biological) to a degree which creates a hazard to the public health through poisoning or through the spread of disease.
"CROSS CONNECTION." Any unprotected connection between any part of the village waterworks system used or intended to supply water for drinking purposes and any source or system containing water or substances that are not or cannot be approved as safe, wholesome, and potable for human consumption.
"DIRECTOR." The Director of Public Works of the village or his authorized representatives.
"PERSON." Any natural person, firm, association, organization, partnership, trust, or association of persons, joint venture, corporation, or company.
"PREMISES." Integrated land area, including improvements thereon, undivided by public thoroughfares or water distribution mains of the village where all parts of the premises are operated under the same management and for the same purpose.
"PROTECTIVE DEVICE." Any of the following devices:
(1) Air gap separation;
(2) Approved reduced pressure principle backflow prevention device; or
(3) Approved double check valve assembly.
"SERVICE CONNECTION." The terminal end of a service connection from the village water supply at its point of delivery to the consumer. If a meter is installed, "SERVICE CONNECTION" means the downstream end of the meter. No unprotected takeoffs from the service line ahead of any meter of backflow protective device located at the point of delivery to the consumer shall be permitted.
(Ord. 1015-87, passed 9-2-87)