(A) Fill and sterilize all new water mains, services, leads and appurtenances in accordance with AWWA C 651. Each section of water main shall be complete and thrust block shall have been in place for not less than ten days prior to being tested.
(B) Fill the new mains with water from the utility distribution system. All air shall be expelled from the mains as they are filled. Tap the water main at high points, if necessary, to assure removal of all air.
(C) The line shall be subjected to leakage test under a hydrostatic pressure in accordance with AWWA C 605-94. The hydrostatic pressure shall be 1½ times the working pressure at the point of testing and shall be maintained within a maximum variation of 5 psi for a period of two hours. Leakage measurements shall not be started until a constant test pressure has been established. The determination of actual leakage shall be made after the line has been returned to the original test pressure at the end of the test duration. The line leakage shall be measured by means of a water meter installed on the supply side of the pressure pump, or method as approved by the engineer.
(1) No pipe installation will be accepted if the leakage is greater than that determined by the following formula:
L = 0.000135ND(P)½
in which L is the allowable leakage, in gallons per hour; N is the number of joints in the length of pipeline tested; D is the nominal diameter of the pipe, in inches; and P is the average test pressure during the leakage test, in pounds per square inch gage.
(2) Where the leakage rate exceeds the permissible maximum, the contractor shall locate and repair the leak. The leakage test shall be repeated until the amount of leakage is less than the amount specified.
(3) All leaks discovered within one year from the date of final acceptance of the work by the owner shall be repaired and retested by the contractor.
(D) Flush all water mains and fire hydrants prior to disinfection. Flush mains with a flushing velocity of at least 2½ feet per second. Flush water mains and hydrants until the water discharged is clear.
(E) Disinfect all new water mains prior to placing the mains in service in accordance with AWWA C 651-92.
(F) Before system is place in service, contractor shall obtain two successive water samples 24 hours apart and have them tested for bacteriological analysis by a state-approved certified laboratory. If samples do not prove satisfactory, the system shall be rechlorinated and resampled until safe water is obtained.
(Ord. 2002-5-1, passed 5-14-02)