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• • <br />a. Cast iron valve boxes are required on all gate valves less than or equal <br />to sixteen inches. Valve vaults are required on all valves larger than <br />sixteen inched. <br />b. All valves shall be sized to equal to the size of the water main on which <br />it is located. <br />Valves <br />a. Spacing -set at maximum distances along the line as follows: <br />(1) ~ 10" & Smaller -1000 feet <br />(2) 12" 8c Larger - 2000 feet <br />(3) The total number of valves at any water line- intersection shall <br />equal the total number of lines leading out from the <br />intersection point minus one. <br />b. Location <br />(1) Normally, locate valves at street intersections along the street <br />right-of--way lines projected across the water line where <br />possible. Tapping sleeve and valves are excluded from this <br />requirement. <br />(2) For all future construction, isolate fire hydrants and flushing <br />valves from the service main with a valve located in the fire <br />hydrant or flushing valve branch. This valve shall not be <br />located in the slope or flowline of roadside ditches. <br />(3) Intermediate valves, not located on the projection of the right- <br />of-way line, shall be located on lot lines of 5 feet from fire <br />hydrants but shall not be set in driveways. <br />(4) Locate valves a minimum of 10 feet horizontally from sanitary <br />sewer crossings. <br />(5) Valves located near reducers shall be located on the smaller <br />diameter pipe. <br />(6) All water mains shall be valved within the streetright-of-way. <br />Valves shall not be placed under or within 2 feet of ultimate. <br />pavement where known without prior approval of the Planning <br />Department. <br />(7) Valves shall be placed at the end of all water mains that are to <br />be extended in the future and the main shall be extended a <br />minimum of one pipe joint past the valve. <br />a Valve Type <br />(1) ~ 12" & smaller -Resilient seated, corrosion resistant, Gate <br />valves, meeting AWWA C509, counter-clockwise opening <br />with mechanical joints <br />(2) 16" & larger -Butterfly valves meeting AWWA C504, with <br />corrosion resistant coating. All Butterfly valves shall be <br />installed in a vault of adequate size & construction. <br />4. Fire Hydrants and Flushing Valves <br />a. Spacing <br />(1) Single family residential development - 500 foot maximum <br />~~g• <br />Water System Design Criteria Page 4 of 12 <br />