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potable water. Sufficient flushing water and pigging shall be introduced into the piping to produce a discharge that is clear with no evidence of silt or foreign matter is visible. Contractor to provide means of discharging and disposing of water at Contractor's expense. C. Pressure testing ductile iron piping systems: 1. The test pressure for the water piping, irrigation quality water piping, and force main piping systems constructed of ductile iron shall be 150 psi and this pressure shall be maintained for a period of not less than two hours. Tests shall be made between valves and as far as practicable and as approved by the Engineer. Potable water from the distribution system shall be used. Pressure shall not vary more than five (5) psi for piping during the test periods or as approved by the Engineer. Allowable leakage shall be computed on the basis of AWWA C-600. 2. All leaks evident at the surface shall be uncovered and repaired regardless of the total leakage as indicated by the test, and all pipes, valves and fittings and other materials found defective under the test shall be removed and replaced at the Contractor's expense. Tests shall be repeated until leakage has been reduced below the allowable amount. 3. In the judgment of the Engineer, should it not be practical to follow the foregoing procedures exactly for any reason, modifications in the procedure shall be made as approved by the Engineer. In any event, the Contractor shall be responsible for the ultimate water tightness of the piping within the preceding requirements. 3.03 DISINFECTION A. The Contractor shall furnish and install suitable temporary connections to the piping, all necessary pressure pumps, hose, pipe connections, meters, gauges and other similar equipment, and all labor required, all without additional compensation for the disinfection of all required piping systems. Disinfection shall be conducted on the following systems: 1. Water main piping and valves. B. Conform to AWWA Standards and as modified herein. C. Maintain disinfectant for a minimum of 8 hours in such a manner that the entire system will be filled with water containing a minimum chlorine concentration of 50 ppm at any point. D. After the disinfecting agents have been permitted to remain for the specified contact periods, the water lines, and valves shall be thoroughly flushed with water until the residual chlorine tests are Tess than 2 PPM in each instance. 01025-35 Technical Specifications F•\Public Works\ENGINEERING DIVISION PROJECTS\0530B 13th Street SW at 58th Ave Bridge\Admin\bid documents\Master Contract Documents\Technical Specifications.doc