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(5) Double check valve with intermediate atmos heric vent. — A device having two <br />(2) spring loaded check valves separated by an atmospheric vent chamber. <br />(6) Hose Bibb vacuum breaker. — A device which is permanently attached to a <br />hose bibb and which acts as an atmospheric vacuum breaker. <br />(7) Pressure vacuum breaker. — A device containing one or two independently <br />operated spring loaded check valves and an independently operated spring <br />loaded air inlet valve located on the discharge side of the check or checks. <br />Device includes tightly closing shut-off valves on each side of the check valves <br />and properly located test cocks for the testing of the check valve(s). <br />(8) Reduced pressurerinci le backflow oreventer., — An assembly consisting of <br />two (2) independently operating approved check valves with an automatically <br />operating differential relief valve located between the two (2) check valves, <br />tightly closing shut-off valves on each side of the check valves plus properly <br />located test cocks for the testing of the check valves and the relief valve. <br />(9) Residential dual check. — An assembly of two (2) spring loaded, <br />independentlyoperating check valves without tightly closing shut-off valves <br />and test cocks. Generally employed immediately downstream of the water <br />meter to act as a containment device. <br />Backflow. Any unwanted flow of used or nonpotable water, or other substances from any <br />domestic, industrial, or institutional piping system back into the potable water <br />distribution system. <br />Backpressure. Pressure that can cause backflow to occur when a potable system is connected <br />to a nonpotable supply operating under a higher pressure than the distribution system <br />by means of a pump, boiler, elevation difference, air or steam pressure, or other means. <br />Backsi honage., The flow of water or other liquids, mixtures or substances into the <br />distribution pipes of a potable water supply system from any source other than its <br />intended source caused by the sudden reduction of pressure in the potable water supply <br />system. <br />Building safet department. The building safety department has the duty and power to <br />enforce all ordinances and laws regulating construction on private property by providing <br />services such as permit issuance, plan examination and inspection. The mission of the <br />building safety department is to protect the lives and safety of the residents and visitors <br />of the City of Paris, preserve quality of life and contribute to economic development and <br />viability of the community. <br />Compliance engine. The compliance engine is a web -based service used by the City of Paris <br />to track and maintain code compliance, reduce false alarm activity, and provide safer <br />communities through third -party inspection reporting and maintenance. <br />Cross -connection. A point in a plumbing system where it is possible for a nonpotable <br />substance to come into contact with the potable drinking water supply. Any actual or <br />