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0 (2) The nature of contaminating material under the most critical <br />circumstances. <br />(3) The extent to which additions may be made to the plumbing system at a <br />later date which would affect the initial selection of the assembly. <br />(4) The frequency with which a water supply could be exposed to a hazardous <br />condition. <br />(5) The degree of protection of the water supply as provided by the local <br />plumbing code as enforced by the building inspections division. <br />(c) Decisions on selection of backflow prevention assembly. The director, <br />acting either personally or through a representative, will have the final approval authority <br />over the type of backflow prevention assembly to be used in each individual case. The <br />director may, in making this decision, obtain the advice and recommendation of the cross <br />connection control committee. <br />(d) All types of establishments listed below must provide for the containment <br />of contamination within their premises, either by an air gap separation between the meter <br />and the first tap or tee, or by having each of the internal plumbing facilities properly air <br />gapped. If the containment air gap separation is impractical, and reliance is placed instead <br />on individual internal air gaps or vacuum breakers in a customer's system, the director <br />may require additional protection in the form of either an R/P assembly, for customers <br />handling hazardous contaminants, or a D/C assembly, for customers handling pollutants. <br />(e) In some instances, the director may require a customer to use total <br />containment backflow prevention or to allow the backflow prevention assembly to be <br />installed on an internal branch line. An example of this would be for a combination fire <br />and domestic water service from the city water supply. The backflow prevention for the <br />domestic use would be installed immediately after the fireline tee. In such a case, the fire <br />line must be provided with its own separate backflow prevention. <br />(f) Type of device or assembly required. <br />A/G <br />Air Gap Separation <br />RPDA <br />Reduced Pressure Detector Assemblv <br />R/P <br />Reduced Pressure Backflow Prevention <br />Assembly <br />D/C <br />Double Check Valve Assembly <br />DCDA <br />Double Check Detector Assembly <br />PTVB <br />Pressure Type Vacuum Breaker <br />AVB <br />Atmospheric Vacuum Breaker <br />• Type of Use Device or Assembly <br />11 <br />