21 - Cross Connection Control Program Ordinance - Backflow

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ix. Residential Dual Check: An assembly of two (2) spring loaded, independently operating check valves without tightly closing shut-off valves and test cocks. Generally employed immediately downstream of the water meter to act as a containment device. (5) Backpressure: Pressure that can cause backflow to occur when a potable system is connected to a nonpotable supply operating under a higher pressure than the distribution system by means of a pump, boiler, elevation difference, air or steam pressure, or other means (6) Backsiphonage: 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. (7) Building Safety Department: The Building Safety Department has the duty and power to enforce all ordinances and laws regulating construction on private property by providing services such as permit issuance, plan examination and inspection. The mission of the Building Safety Department is to protect the lives and safety of the residents and visitors of the City of Paris, preserve quality of life and contribute to economic development and viability of the community. (8) Compliance Engine: The Compliance Engine is a web -based service used by the City of Paris to track and maintain code compliance, reduce false alarm activity, and provide safer communities through third party inspection reporting and maintenance. (9) Cross -Connection: A point in a plumbing system where it is possible for a nonpotable substance to come into contact with the potable drinking water supply. Any actual or potential connection between the public water supply and a source of contamination or pollution. (10)Manual M14: The American Water Works Association's Recommended Practice for Backflow Prevention and Cross -Connection Control, current edition. (11)TCEQ: The Texas Commission on Environmental Quality. (12)Water Purveyor: The Water Purveyor has the responsibility to supply potable water to the city's customers and has the authority to take or cause to be taken the necessary measures to ensure the public drinking water distribution system is protected from any actual or potential backflow hazards. (13)Water Service Entrance: That point in the owner's water system beyond the sanitary control of the water purveyor; generally considered to be the outlet end of the water meter and always before any unprotected branch. b. Purpose Within distribution systems there exist points called cross -connections where nonpotable water can be connected to potable sources. These cross -connections can provide a pathway for backflow of nonpotable water into potable sources. Backflow can occur either because of reduced pressure in the distribution system (termed backsiphonage) or the presence of increased pressure from a nonpotable source (termed backpressure). Backsiphonage may be caused by a variety of circumstances, such as main breaks, flushing, pump failure, or emergency firefighting water drawdown. Backpressure may occur when heating/cooling, waste disposal, or industrial manufacturing systems are connected to potable supplies and the pressure in the external system exceeds the pressure in the distribution system. Both situations act to change the direction of water, which normally flows from the distribution system to the customer, so that nonpotable and potentially contaminated water from industrial, commercial, or residential sites flows back into the distribution system through a cross -connection. During incidents of backflow, these