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AWWA Standard C605, "Underground Installation of Polyvinyl Chloride (PVC) Pressure Pipe and Fittings for Water". Engineer shall be present during all testing, and final inspections. No hydrostatic testing against existing system valves shall be allowed until the section to be tested has been bacteriologically cleared. 2 .02 The new water system shall remain disconnected (connecting valve to be locked in the closed position) from existing water lines except for the temporary jumper connection. All water used to fill and test the new water system shall be obtained through the temporary jumper connection. Flushing shall only be conducted in accordance with the plans. 2 .03 The general procedure for chlorination shall be first to flush all dirty or discolored water from the lines, and then introduce chlorine in approved dosages in accordance with Table 11 - 1 through a tap at one end, while water is being withdrawn at the other end of the line. The chlorine solution shall remain in the pipeline for no less than 24 hours. 2 .04 Following the chlorination period, all treated water shall be flushed from the lines at their extremities and replaced with water from the distribution system. Bacteriological sampling and analysis of the replacement water shall then be made in the presence of the Engineer in full accordance with the AWWA Standard C-651 . The Contractor will be required to re-chlorinate, if necessary. The line shall not be placed in service until the requirements of the State and County Public Health Department are met. 2 .05 The Contractor shall make all arrangements necessary with an independent commercial laboratory approved by the Department of Health and Rehabilitative Service (HRS) for the collection and examination of samples of water from disinfected water mains. These samples shall be examined for compliance with HRS requirements. Sampling shall be made daily and continuously until two successive examinations are found satisfactory. Should three examinations be found unsatisfactory, the line shall be flushed and disinfected again. Certified copies of all laboratory analyses shall be provided to the Owner. The cost of all sampling, flushing, and disinfecting shall be included in the contract price and no additional charge shall be made to the Owner for this work. County personnel shall operate all valves and be present to determine volume of water used for flushing. (continued on next page) e 02519 — Testing and Disinfecting Water System 02519 - 2