As used in this chapter
(a) "Air gap separation" means the unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet supplying water to a tank, plumbing fixture or other device and the flood level rim of the receptacle. An air gap separation is used to prevent either backflow or backsiphonage.
(b) "Atmospheric vacuum breaker" or "nonpressure-type backsiphonage preventer" means a device which prevents backsiphonage by creating an atmospheric vent when there is either a negative pressure or subatmospheric pressure in a water system. Such a device is used as protection for direct or indirect water connections to all types of polluted or contaminated liquids, where the preventer is not subjected to backpressures and is installed on the discharge side of the last control valve. This preventer should not be subjected to continuous flows for periods of more than twelve hours.
(c) "Backflow" means the flow of water or other liquids, mixtures or substances into the water distribution system from other than the intended liquids, mixtures or substances of the public water supply system.
(d) "Backsiphonage" means the flowing back of water or other liquids, mixtures or substances into a water distribution system due to negative pressure in the piping of the water distribution system.
(e) "Belt line," "main" and "commercial main" mean any pipe other than a supply pipe or service pipe used for the purposes of carrying water to or distributing it in the City.
(f) "Contaminant" means a substance that will impair the quality of the water to a degree that it creates a serious health hazard to the public, leading to poisoning or the spread of disease.
(g) "Cross-connection" means any actual or potential connection or structural arrangement within a water distribution system through which it is possible to introduce into the public water supply system any water, liquids, mixtures or substances, other than the intended water, liquids, mixtures or substances of the public water supply system.
(h) "Double check-valve assembly backflow preventer" means a device containing one or two independently operated spring loaded check valves and an independently operated spring loaded air inlet valve located on the discharge side of the check or checks. The device includes tightly closing shut-off valves on each side of the check valves and properly located test cocks for the testing of the check valve. It is used as protection for all direct or indirect water connections through which foreign substances might enter the system in such concentrations as to constitute a nuisance or be aesthetically objectionable. Examples of such substances are foods, beverages or other substances that do not constitute a health hazard.
(i) "Nontoxic substance" means any substance of a nonpoisonous nature that may create a moderate or minor hazard to the domestic water system.
(j) "Hazardous connections" means and includes:
(1) Connections to food processing lines, including, but not limited to, those carrying syrups, lard or beer;
(2) Connections to steam and steam boilers where the steam does not come in contact with toxic substances;
(3) McDaniel tees or steam clean-up connections in food plants, apartment house boilers, or pressing boilers where toxic compounds are not used; and
(4) Connections to enclosed circulating systems, such as radiant-heating systems and refrigerated-water systems, where toxic compounds are not used.
(k) "Pressure vacuum breaker backsiphonage preventer" means an assembly of two independently operating spring loaded check valves with tightly closing shut off valves on each side of the check valves, plus properly located test cocks for the testing of each check valve. It is used as a protection for direct or indirect water connections to all types of polluted or contaminated liquids, where the preventer is not subjected to backpressures. This device may be installed for use under continuous line pressure.
(l) "Reduced-pressure device backflow preventer" means an assembly consisting of two independently operating approved check valves with an automatically operating differential relief valve located between the two check valves, tightly closing shut-off valves on each side of the check valves, plus properly located test cocks for the testing of the check valves and the relief valve. It is used as protection for direct or indirect water connections where the device may be subject to back-pressures from toxic chemicals, sewage or other lethal substances.
(m) "Separate premises," when considering the expediency of permitting deduct meters or more than one consumer to secure water from the same service or supply pipe, means a separate dwelling or apartment, a building or structure used for a separate business or each distinct business in a business building or structure, provided that if deduct meters or two or more consumers are allowed or permitted on the same service or supply pipe, each such consumer shall be billed for and shall pay the monthly minimum, and provided, further, that where a separate business and a dwelling are used in connection by the same owner or by the same tenant and are on the same City lot or parcel of ground and are occupied by the same person and his or her family, the same shall constitute a separate premises.
(n) "Service pipe" means the pipe extending from the shut-off, stop box, curb cock or valve at or near the lot line to and beyond the property line of the consumer.
(o) "Supply pipe" means any pipe tapped into a main and extending thence to a point at or near the lot line of the consumer's premises where the shutoff, stop box, curb cock or valve is located.
(p) "Toxic substance" means any substance (liquid, solid or gaseous), including raw sewage and lethal substances, that when introduced into the water supply system creates or may create a danger to the health and well being of the consumer. Hazardous connections include, but are not limited to, flush valve toilets and direct connections to contaminated vessels or systems.
(Ord. 1174. Passed 4-24-90.)