AIR GAP: A physical separation sufficient to prevent backflow between the free flowing discharge end of the potable water system and any other system. Physically defined as a distance equal to twice the diameter of the supply side pipe diameter but never less than one inch (1").
APPROVED BACKFLOW PREVENTION ASSEMBLY: A backflow prevention assembly that has passed rigorous testing by the University Of Southern California Foundation For Cross Connection Control And Hydraulic Research or other state approved organization.
ATMOSPHERIC VACUUM BREAKER: A device which prevents back siphonage by creating an atmospheric vent when there is either a negative pressure or subatmospheric pressure in a water system.
AUXILIARY WATER SUPPLY: Any water supply on or available to the premises, other than the purveyor's public water supply, will be considered as an auxiliary water supply.
BACK PRESSURE: A condition in which the owner's system pressure is greater than the supplier's system pressure.
BACK SIPHONAGE: The flow of water or other liquids, mixtures or substances into the distribution pipes of a potable water supply system from any source other than its intended source caused by the sudden reduction of pressure in the potable water supply system.
BACKFLOW: The flow of water or other liquids, mixtures or substances, under positive or reduced pressure in the distribution pipes of a potable water supply from any source other than its intended source. The undesirable flow of water in the reverse direction. Backflow can occur under two (2) conditions: back siphonage and back pressure.
CERTIFIED BACKFLOW TESTER: A person who has been certified and has a license to test backflow prevention assembly from the American Water Works Association (AWWA), American Backflow Prevention Association (ABPA) or other state approved entity that can certify backflow testing procedures.
CONSUMER: The owner or user of water from the public water system.
CONTAMINATION: The presence of any 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.
CROSS CONNECTION: Any actual or potential connection between the public water supply and a source of contamination or pollution.
CROSS CONNECTION CONTROL SPECIALIST: A person who is certified in conducting surveys, identifying cross connections and specializing in proper backflow protection.
DOUBLE CHECK VALVE ASSEMBLY: An approved backflow prevention assembly of two (2) independently operating spring loaded check valves with tightly closing resilient seated shutoff valves on each side of the check valves, plus properly located test cocks for the testing of each check valve.
OWNER: Any person; whether individual, corporation, company, association, partnership, municipality, public utility, or other public body or institution; who has legal title to, or license to operate or habitat in, a property upon which a cross connection inspection is to be made or upon which a cross connection is present.
PLAN OF ACTION: A detailed plan the property owner must submit for approval to the Ely municipal water department within thirty (30) days of receiving the follow up letter summarizing the on site survey. The plan of action must state the specific time line the owner needs to save funds for and install the required backflow prevention assembly.
POLLUTION: The presence of any foreign substance, that if permitted to get into the public water system, will degrade its quality so as to constitute a moderate hazard. Or impair the usefulness or quality of the water to a degree which does not create an actual hazard to the public health but which does adversely and unreasonably affect such water for domestic use.
REDUCED PRESSURE PRINCIPLE ASSEMBLY: An approved backflow prevention assembly consisting of two (2) independently operating spring loaded check valves with an automatically operating differential relief valve located between the two (2) check valves, tightly closing resilient seated shutoff valves on each side of the check valves, plus properly located test cocks for the testing of the check valves and the relief valve. (Ord. 658, 7-11-2013)