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D. Private Water System If there is an auxiliary water supply on or available to the <br /> ® premises that is a potential high hazard, including a fire protection system. <br /> E. Used Waters and Industrial Fluids If there is a used water or industrial fluid <br /> system on the premises that is a potential high hazard. <br /> F. Solar Heating Systems If there is a solar heating system on the premises, and <br /> chemicals are added to the solar heating system or the solar heating system is not <br /> used exclusively for once through heating (i.e. domestic hot water.) <br /> G. Chemically Contaminated Water Systems If chemicals are used as an additive, <br /> to the water, or the water is subjected to additional treatment, or water is used on <br /> the premises to transport chemicals or chemicals are used with water on the <br /> premises in compounding or processing. <br /> H. Sewers and Storm Drains Any premises used for handling sewage or storm <br /> water(e.g. treatment and processing facilities, pumping plants, gauging stations, <br /> lift stations, ejector plants.) <br /> I. Public Fire Hydrants As Temporary Water Services The Water System shall <br /> be protected by an approved RPZA on the outlet of any fire hydrant when it is <br /> used as a water supply, except when used to extinguish a fire. <br /> • J. Irrigation System If there is an irrigation system on the premises. <br /> 4.3 DCVA CONTAINMENT <br /> An approved DCVA may be the minimum backflow prevention required in the water <br /> service line if the owner can document that there are no potential high hazards on the <br /> premises. <br /> A. Buildings Any multi-story building, hotel, apartment house, public or private <br /> structure if a booster pump is used on the premises, or it is expected that a piping <br /> or equipment change might be made that could result in a cross connection to a <br /> low hazard. <br /> B. Establishments Any establishment containing chemical or biological pollutants. <br /> C. Interconnected Water Services If there is a potential for two or more water <br /> service lines being interconnected, and all water is used domestically, and only <br /> water from the Water System is available to the premises. <br /> D. Private Water Systems If there is an auxiliary water supply on or available to the <br /> ® 13 <br />