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D . Testing shall be conducted after backfilling has been completed and before placement of permanent surface . E . Allowable amount of makeup water for expansion during the pressure test of the pipe shall conform to Plastic Pipe Institute ( PPI ) Handbook of Polyethylene Pipe ; Inspection , Tests , and Safety Considerations , unless otherwise approved by the Engineer. The Operating Safety Considerations , Post Installation , Hydrostatic Testing , Monitored Make-up Water Test, Table 111 , is on Pages 24 and 25 of the Handbook. F . In any test of pipe laid disclosed leakage or significant pressure drop greater than the allowed , the Contractor shall , at its own expense , locate and repair the cause of leakage and retest the line . The amount of leakage that may be permitted shall be in accordance with AWWA Standard Specifications . G . All visible leaks are to be repaired regardless of the amount of leakage . H . The Contractor must submit his plan for testing to the Engineer-of- Record and Utility Inspector for review at least ten ( 10) days before starting the test. 10 . 03 DISINFECTING POTABLE WATER PIPELINES A. Before being placed in service , all potable water pipelines shall be disinfected in accordance with AWWA Standard Specifications C-651 -99 , or latest revision . The location of the chlorination and sampling points will be as shown on the drawings . The Contractor shall uncover and backfill taps for chlorination and sampling , as required . B . 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introduce chlorine in approved dosages in accordance with Table 10- 1 through a tap at one end , while water is being withdrawn at the other end of the line . The chlorine solutions shall remain in the pipeline for no less than 24 hours . C . The use of chlorine tablets is strictly prohibited . D . Following the chlorination period , all treated water shall be flushed from the lines at their extremities and replaced with water from the distribution system . The Contractor's lab shall then make bacteriological sampling and analysis of the replacement water in full accordance with AWWA Standard Specifications C-651 , or latest revision . The Contractor will be required to re-chlorinate , if necessary. The line shall not be placed in service until all the requirements of the State and County Environmental Health Departments are met. E . Special disinfecting procedures shall be used in connections to existing mains where the method outlined above is not practical . 10 - 3