(A) Sterilization. Sterilization of new water mains shall be in accordance with the current revision of AWWA C-651 “Standard for Disinfecting Water Mains”, as modified by these specifications after an approved pressure test on the main and appurtenances. The contractor shall ensure that the mains to be sterilized are isolated to prevent the chlorine solution from entering into the existing system. After the completion of the mains and approval of pressure test and flushing, a solution of calcium hypochlorite and water shall be injected into the system at a slow rate from the point where it connects with the existing system so that there will be an even distribution of the solution throughout the pipe. As the main is being filled, air shall be bleed off at hydrants, blow offs or taps located at highest elevation until all air is eliminated. Chlorine tablets affixed to the crown of the pipe may be used with approval from the engineer. The form of chlorine, disinfecting equipment and procedures shall be subject to the approval of the owner and the engineer. After the main has been filled, all air eliminated and the minimum residual chlorine content of 50 parts per million (ppm) has been attained, it shall be allowed to stand for 24 hours with the chlorinated water. All valves and hydrants in the new main shall be operated to assure full disinfection. At the end of the 24-hour test period, the minimum free chlorine residual at the pipe extremities shall be ten ppm. If this requirement is not met, the sterilization procedure shall be repeated. The new mains shall be thoroughly flushed after sterilization until extremities indicated the same chlorine residual as the water supply. Before the newly laid water mains are put into use, the owner shall collect two water samples 24 hours apart at 1,200 foot intervals and at the end of the pipe for bacteriological examination. If the tests are returned unsatisfactory or unsafe, the sterilization procedure shall be repeated until the test samples are returned safe.
(B) Restrained joints, kickers and clamping. Bracing for fittings and valves will be subject to the approval of the engineer prior to installation. Restrained joints and precast concrete kickers bearing against undisturbed earth shall be installed at all fittings providing bends in the pipeline and at hydrants. No special payment will be made for restrained joints or kickers. Cost of supplying and installing materials shall be incidental to the water main construction. Wood blocking shall not be used for kicker adjustment. The lengths of pipe requiring joint restraining locking lugs shall be in accordance with manufacturer’s recommendations.