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the storage facilities must be maintained in a potable condition.) <br /> Class 4 - A fire protection system that is the same as a Class 1 or Class 2 system; except <br /> that an auxiliary water supply is on or available to the properties, or there is an auxiliary <br /> water supply designated by the Utilities Department within a radius of 1,700 feet from a <br /> pumper connection to the fire protection system. (Note - Connection to an auxiliary water <br /> supply cannot exist in a Class 4 fire protection system.) <br /> Class 5 - A fire protection system that is connected to an auxiliary water supply which <br /> could be exposed to a high hazard (e.g. nonpotable reservoirs, rivers, ponds, wells, <br /> industrial water), or that uses additives (e.g. antifreeze, wetting agents, "Foamite"), or that <br /> does not maintain a minimum pressure of 20 psig on the inlet side of a booster pump as <br /> defined for a Class 2 fire protection system. <br /> Class 6 - A fire protection system that is connected to a water service line from the <br /> Water System if the water service line is not used exclusively for fire protection. <br /> 4.7 BACKFLOW PREVENTION ON FIRE PROTECTION SYSTEMS <br /> The Water System shall be protected by an approved method of backflow prevention in <br /> water service lines to fire protection systems, regardless of backflow prevention <br /> requirements in other water services on the premises. <br /> A. Classes 1 & 2 An approved DDCVA is required as the minimum backflow <br /> prevention in the water service line to a Class 1 or Class 2 fire protection system, <br /> if the owner can document that there are no potential high hazards on the <br /> premises, and all fire protection system water storage vessels are maintained in a <br /> potable condition. An approved DRPZA is required in the water service line to the <br /> fire protection system if there is a potential high hazard on the premises. <br /> B. Class 3 An approved DDCVA is required as the minimum backflow prevention <br /> in the water service line to a Class 3 fire protection system, if the owner can <br /> document that there are no potential high hazards on the premises, and all fire <br /> protection system water storage vessels are maintained in a potable condition. An <br /> approved DRPZA is required in the water service line to a Class 3 fire protection <br /> system if the industrial or domestic water system could potentially be subjected to <br /> a high hazard. <br /> C. Classes 4. 5 & 6 An approved DRPZA is required in the water service line to a <br /> Class 4 or Class 5 fire protection system. <br /> D. Retrofit Of Existing Systems This applies to an existing fire protection system <br /> which is modified, extended, or enlarged. Such systems include a modification or <br /> 15 <br /> n <br />