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(5) <br /> <br />(c) Low Hazard: <br /> (1) <br /> <br /> (2) <br /> <br /> (3) <br /> <br />Examples: Food stuff, nontoxic <br />chemicals, nonhazardous chemicals, <br /> <br />etc. <br /> <br /> The contaminant would only degrade the <br /> quality of the water aesthetically. <br /> <br /> A health hazard would not exist. <br /> <br /> A low probability exists of the <br /> occurrence of backflow primarily by back <br /> siphonage. <br /> <br /> (4) The contaminant would not disrupt service <br /> of piped water. <br /> <br /> (5) Examples: Food stuff, nontcxic <br /> chemicals, nonhazardous chemicals, etc. <br /> <br />Section 38-183. Standards for backflow prevention devices. <br /> <br /> Devices for the prevention of backflow shall be tested <br />and certified to meet the standards of the below-listed <br />agencies: <br /> <br />American Society of Sanitary Engineers (ASSE). <br /> <br />American Water Works Association (AWWA). <br /> <br />American National Standards Institute (ANSI]. <br /> <br />University of Southern California Foundation for <br />Cross-Connection Control. <br /> <br />Commonwealth of Virginia State Board of Health. <br /> <br />Section 38-184. <br /> <br />Location and installation requirements for <br />protective devices. <br /> <br /> (a) Backflow prevention devices shall be accessibly <br />located, preferably in the same room with the fixture they <br />serve. In all cases, installation will be in accordance with <br />the director's specifications. <br /> <br /> (b) Atmospheric vacuum breakers shall be installed with <br />the critical level at least six (6) inches above the flood <br />level rim of the fixture they serve and on the discharge side <br />of the last control valve to the fixture. <br /> <br /> (d) Reduced-pressure principle backflow preventers and <br />double-check valve assembly shall be installed a minimum of <br />twelve (12) inches above existing ground level in an easily <br /> <br /> <br />