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measured at the hydrant outlet of not less than twenty (20) pounds per square inch during times of average daily consumption. Water supply may consist of reservoirs, pressure tanks, elevated tanks, water mains, or other fixed system capable of supplying the required fire flow, subject to the approval of the fire marshal. The precise location, number and type of fire hydrants connected to a water supply to be provided in accordance with this subsection shall be subject to the approval of the fire marshal. All hydrants shall be accessible to the fire department apparatus by roadways meeting the requirements of Section 503. No use of an existing building, or any portion thereof, for either a place of assemblage or a Group H occupancy, as defined in subsections 903.2.1 and 903.2.5, shall be initiated or expanded unless the building as a whole will comply with the requirements of this subsection 507.1 such as would apply to the new construction of such building for the same uses. For purposes of this section, an existing building or structure shall be deemed to have a value equal to the current cost of construction of a building or structure of the same size and type of construction. In determining such value, the fire marshal shall be guided by the most recent building valuation data published by the International Conference of Building Officials. In determining the fire flow requirements for any building, structure, or fire area, the fire marshal shall proceed in accordance with the standards set forth in that certain "Santa Ana Fire Department Guide for Determination of Fire Flows," of which not less than one (1) copy is on file in the office of the clerk of the council of the City of Santa Ana. (b) Subsection 507.3 of the California Fire Code is amended to read as follows: 507.3. Fire Flow Methods. An automatic sprinkler system must be installed in buildings hereafter constructed, or when additions, alterations, or repairs are such as to require the building to comply with all the requirements of the building code of the City of Santa Ana for new buildings, in either of the following circumstances: • The building would require a fire flow of more than two thousand five hundred (2,500) gallons per minute if such system were not installed; Ordinance No. NS -2810 Page 34 of 43