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ORDINANCE NO. NS- 1727 PAGE SIX (5,500) gallons per minute Shall be added to, altered, or changed in the character of its occupancy if such addition, alteration, or change would increase the fire flow required for such building. No building shall hereafter be constructed, and no additions, alterations, or repairs shall be made to an existing building within any twelve- month period which exceed twenty-five (25) percent of its value, and no existing building shall be changed in the character of its occupancy so as to increase the fire flow required for such building, unless fire hydrants and appurtenant water supply capable of delivering the fire flow that will be required for such building, with a residual pres- sure measured at the hydrant outlet of not less than twenty (20) pounds per square inch during times of average daily consumption, are located in accord- ance with the following distance limitations: 1. In any case where this requirement applies solely by reason of additions, alterations, or repairs to an existing building; and in the case of new construction of a building designed for Group R, Division 3 occupancy, as defined in the building code of the City of Santa Ana, or building or structure accessory thereto: the required hydrant or hydrants must be located within five hundred (500) feet of all portions of the exterior walls of the building to be pro- tected. Such required hydrant or hydrants may be located either on a public street or on the site of the premises to be protected. 2. In all other cases: The required hydrant or hydrants shall be located on the site of the premises to be protected, except that any re- quired hydrant may be located on a public street if such location is within one hundred fifty (150) feet of all portions of the exterior walls of the building to be protected. Where more than one fire hydrant is located on the site of the premises to be protected, or where a combination of hydrants located on such site and a public street are used to meet the distance require- ments, the required fire flow in gallons per minute may be divided between such hydrants provided: