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The following minimum size and spacing criteria shall govern the design of extensions to the water supply system:
A. Main Size: In a commercial area a ten inch (10") diameter water main shall be the minimum standard diameter of public water main to be installed. An eight inch (8") diameter water main may be used in a commercial area only where it completes a closed gridiron and where the water main is of short distance and closely interconnected. In a residential area an eight inch (8") water main shall be the minimum standard diameter of water main installed. A six inch (6") diameter water main shall be used only where it completes a closed gridiron and in no case for runs of over six hundred feet (600') between interconnections. Certain public water mains that are not required to provide water for fire suppression and which may never be extended may be reduced in size to meet customer demands provided the written approval of the public works director is first obtained. If larger public water mains are required to serve a new development or future development, then the applicants requesting the water extension involved shall install such larger water mains at their expense.
B. Water Main Valves: Valves shall be located on public water mains so that the maximum shutoff lengths do not exceed five hundred feet (500') in commercial areas and eight hundred feet (800') in residential areas. All such valves so required shall be of the same diameter as the public water mains they are appended to.
C. Fire Hydrants And Branches: Whenever possible gridironing of public water mains shall be planned so that not more than one fire hydrant will be installed on a six inch (6") diameter water main between intersecting mains, and not more than two (2) fire hydrants installed on an eight inch (8") diameter water main between intersecting mains. In industrial, warehouse, institutional, shopping center or other high value areas within or without the principal business district, there shall be one or two (2) fire hydrants at each street intersection, depending upon the character of the area, with intermediate fire hydrants placed so that they are not over three hundred feet (300') apart. In general, depending upon the area's characteristics, the average area to be served by each fire hydrant shall be from eighty thousand (80,000) to ninety thousand (90,000) square feet. In residential areas there shall be one fire hydrant installed at each street intersection with intermediate fire hydrants located so that said fire hydrants are spaced not over five hundred feet (500') apart. In general, depending upon the area's characteristics, the average area to be served by each fire hydrant shall not exceed one hundred ten thousand (110,000) square feet. Fire hydrant branches shall have a minimum diameter of six inches (6"). In all cases a valve shall be installed on each fire hydrant branch and in no case shall the valve be of smaller diameter than the fire hydrant branch. Branch valves shall be located not more than eighteen inches (18") from the branch feeder main. (Ord. 354, 2-21-1984)