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C . Testing shall be conducted after backfilling has been completed and before placement of permanent surface . D . Testing Procedure shall be as follows : 1 . Fill line slowly with water. Maintain flow velocity less than two feet per second . 2 . Expel air completely from the line during filling and again before applying test pressure . Air shall be expelled by means of taps at points of highest elevation . 3 . Apply initial test pressure and allow to stand without makeup pressure for two to three hours , to allow for diametric expansion or pipe stretching to stabilize . 4 . After this equilibrium period , apply the specified test pressure and turn the pump off. The final test pressure shall be held for one to three hours . 5 . Upon completion of the test, the pressure shall be bled off from a location other than the point where pressure is monitored . The pressure drop shall be witnessed by the resident project representative at the point where the pressure is being monitored and shall show on the recorded pressure read-out submitted to the Engineer. E . Allowable amount of makeup water for expansion during the pressure test shall conform to Chart 6 , Allowance for Expansion Under Test Pressure , Technical Report TR 31 /9-79 , published by the Plastic Pipe Institute ( PPI ). If there are no visual leaks or significant pressure drops during the ' final test period , the installed pipe passes the test. F . In any test of pipe laid disclosed leakage significant pressure drip greater than the allowed , the Contractor shall , at his/her own expense , locate and repair the cause of leakage and retest the line . The amount of leakage which will be permitted shall be in accordance with AWWA C600 Standards . G . All visible leaks are to be repaired regardless of the amount of leakage . ' K The Contractor must submit his plan for testing to the Engineer for review at least ten ( 10 ) days before starting the test. ' 1 . 10 CLEANING A . At the conclusion of the work, thoroughly clean all of the new pipelines to remove all dirt, stones, pieces of wood or other material which may have entered during the construction period . Debris cleaned from the lines shall be removed from the job site . If, after this cleaning, any obstructions remain, they shall be removed. END OF SECTION 02627 - 8 RlUtilities\UTILITY - ENGINEERING\WTP - North RO\N RO Brine Line Discharge - UCP#2208\BID DOCUMENTS North County RO\BID DOCUMENTS\02627 Water Mains High Density Ployethylene.doc