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D. Testing shall be conducted after backfilling has been completed and <br /> before placement of permanent surface. <br /> E. Allowable amount of makeup water for expansion during the pressure test <br /> of the pipe shall conform to Plastic Pipe Institute (PPI) Handbook of <br /> Polyethylene Pipe; Inspection, Tests, and Safety Considerations, unless <br /> otherwise approved by the Engineer. The Operating Safety <br /> Considerations, Post Installation, Hydrostatic Testing, Monitored Make-up <br /> Water Test, Table III, is on Pages 24 and 25 of the Handbook. <br /> F. In any test of pipe laid disclosed leakage or significant pressure drop <br /> greater than the allowed, the Contractor shall, at its own expense, locate <br /> and repair the cause of leakage and retest the line. The amount of <br /> leakage that may be permitted shall be in accordance with AWWA <br /> Standard Specifications. <br /> G. All visible leaks are to be repaired regardless of the amount of leakage. <br /> H. The Contractor must submit his plan for testing to the Engineer-of-Record <br /> and Utility Inspector for review at least ten (10) days before starting the <br /> test. <br /> 13.03 DISINFECTING POTABLE WATER PIPELINES <br /> A. Before being placed in service, all potable water pipelines shall be <br /> disinfected in accordance with AWWA Standard Specifications C-651-99, <br /> or latest revision. The location of the chlorination and sampling points will <br /> be as shown on the drawings. The Contractor shall uncover and backfill <br /> taps for chlorination and sampling, as required. <br /> B. The general procedure for chlorination shall be first to flush all dirty or <br /> discolored water from the lines, and then introduce chlorine in approved <br /> dosages in accordance with Table 10-1 through a tap at one end, while <br /> water is being withdrawn at the other end of the line. The chlorine <br /> solutions shall remain in the pipeline for no less than 24 hours. <br /> C. The use of chlorine tablets is strictly prohibited. <br /> D. Following the chlorination period, all treated water shall be flushed from <br /> the lines at their extremities and replaced with water from the distribution <br /> system. The Contractor's lab shall then make bacteriological sampling <br /> and analysis of the replacement water in full accordance with AWWA <br /> Standard Specifications C-651, or latest revision. The Contractor will be <br /> required to re-chlorinate, if necessary. The line shall not be placed in <br /> service until all the requirements of the State and County Environmental <br /> Health Departments are met. <br /> E. Special disinfecting procedures shall be used in connections to existing <br /> mains where the method outlined above is not practical. <br /> 13 - 3 <br />