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<br />5.4B <br />Page 3 <br /> <br />B. Backflow: The undesirable reversal of flow in a potable water distribution system <br />as a result of cross connection. <br /> <br />C. Backpressure: A pressure. higher than the supply pressure. caused by a pump, <br />elevated tank, boiler. or any other means that may cause backflow. <br /> <br />D. Backsiphonage: Backflow caused by negative or reduced pressure in the supply <br />piping. <br /> <br />E. Backflow Prevention Assembly: An assembly or means designed to prevent <br />backflow. <br /> <br />F. City: The City of Redwood City <br /> <br />G. Contamination: An impairment of a potable water supply by the introduction or <br />admission of any foreign substance that degrades the quality and creates a <br />health hazard. <br /> <br />H. Cross Connection: A connection or potential connection between any part of a <br />potable water system and any other environment containing other substances in <br />a manner that, under any circumstances would allow such substances to enter <br />the potable water system. Other substances may be gases, liquids, or solids, <br />such as chemicals, waste products, steam, water from other sources (potable or <br />non-potable), or any matter that may change the color, add odor. or in any way <br />change the quality of the potable water system. <br /> <br />I. Customer-User: Any person or organization with whose premise contains a <br />customer water system and who receives water or water service from the City's <br />water system and whose name appears on the water bill for water serving that <br />premise. <br /> <br />J. Director: Director of Public Works Services for the City or authorized <br />representative. <br /> <br />K. Hazard, Degree of: The term is derived from an evaluation of the potential risk to <br />public health and the adverse effect of the hazard upon the potable water <br />system. <br /> <br />L. Industrial-Fluids Systems: Any system containing a fluid or solution that may be <br />chemically, biologically, or otherwise contaminated or polluted in a form or <br />concentration, such as would constitute a health, system, pollution, or plumbing <br />hazard, if introduced into an approved water supply. This may include, but not <br />be limited to, polluted or contaminated waters; all types of process waters and <br />used waters originating from the public potable water system that may have <br />deteriorated in sanitary quality; chemicals in fluid form; plating acids and alkalies; <br />circulating cooling water connected to an open cooling tower; and I or cooling <br /> <br />ATTY/ORD/ORD.305 <br />041608 <br /> <br />3 <br />