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The water system shall be made available for private fire protection systems which incorporate, or may have access to any water supply other than that provided through the water system, by the following methods only:

A. An elevated tank or standpipe supplied at the top, and with sufficient air-gap above the overflow. Such elevated tank or standpipe may then be connected to the fire protection system piping without a by-pass or interconnection between the fire protection system piping and the supply connection from the water system main;

B. Construction of a ground storage tank or reservoir supplied at the top, and with sufficient air-gap above the overflow. A pump taking its suction from such ground storage tank or reservoir may be installed for pumping to an elevated tank and/or directly to the fire protection system pipe;

C. Two independent systems of piping without any by-pass or interconnection whatsoever, one being supplied from the water system and the other from the independent water supply;

D. Approved backflow prevention device(s) may be used to protect the potable water supply from contamination by other sources. (Ord. 1237-86 § 53, 1986.)