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SECTION 3400 <br /> WATERMAIN DESIGN STANDARDS <br /> A. DESIGN CRITERIA <br /> 1. The minimum size of watermain shall be 8 inches. (Hydrant leads can be 6"). <br /> 2. Watermain pipe shall be ductile iron in accordance with AWWA C151. <br /> 3. The minimum bury depth of watermain shall be 7' - 6" to top of pipe. <br /> 4. The minimum size of water service lines and corporations shall be 1 inch. Three- <br /> quarter inch by 1-inch corporations may be used when tapping mainlines. Water <br /> service pipe shall be Type K, seamless copper water tubing, soft annealed temper <br /> and conform to the requirements of ASTM B 88. When water service lines <br /> exceed 200-feet, the service line and corporation shall be 11/". <br /> 5. No be constmeted,alt wotetiflait* <br /> 6. Water looping outside of the Right of Way shall be HDPE, valved at each end <br /> with no connection/services in between. <br /> 7. HDPE watermain shall have location tracer wire placed with it. The location wire <br /> shall be 8-gauge plastic jacket type TW or THW. Splices shall be made using 3M <br /> cast kits and shall not occur more frequently than one per 250 feet of pipe. <br /> Tracer wires shall run up along the outside of the valve box and be threaded <br /> through a hole in the top part of the valve box drilled for that purpose. See <br /> Standard Plate 3408. <br /> 8. Temporary dead-end mains shall be equipped with a fire hydrant for flushing <br /> purposes. <br /> 9. Hydrants shall be spaced so that all portions of a building or residence to be <br /> protected are within a 250 foot radius of a hydrant. (Final review will be made by <br /> the Fire Chief and City Engineer) <br /> 10. Each hydrant lead shall be equipped with a resilient seated valve for shut-off <br /> purposes and installed in accordance with the standard detail. <br /> 11. Valves shall be placed throughout the distribution system so that each portion <br /> may be isolated with the least interruption of service. Valves shall be placed at <br /> each roadway intersection or the intersection of watermains. (Final review will be <br /> made by the Water Superintendent and City Engineer) <br /> Elk River Design Standards-March 2006 3400- 1 <br /> 117 <br />