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2 .2 .4 Brine Main Trenches Pine m T All pipe shall be laid to the depth and grades according to the Plans . The depth shall be measured from the established bench marks. Pipe Joints The ends of pipe, coupling grooves, gaskets and rubber rings shall be cleaned immediately before assembling. The assembly shall be made as recommended by the manufacturer. Lubricant for sealing gasket shall be as specified in ANSI 21 . 11 (AWWA C11142). Pipe shall not be deflected either vertically or horizontally in excess of that recommended by the manufacturer. Preventing Trench Water from Entering Pine When pipe laying is not in progress, the open ends of installed pipe shall be closed by approved means to prevent entrance of trench water into the line. Floating Pipe Whenever water is excluded from the interior of the pipe, adequate backfill shall be placed on the pipe or well pointing installed to prevent floating. Any pipe which has floated shall be removed from the trench and be re-laid as directed by the Engineer. ' All foreign matter or dirt shall be removed from the interior of pipe before lowering into position in the trench. Pipe shall be kept clean by means approved by the Engineer during and after I aying. Alignment and Grade The pipe shall be laid, as directed by the Engineer, on a firm soil cut true and even to afford bearing for the full length of the barrel of the pipe. Temporary support, adequate protection and maintenance of all underground and surface utility structures, drains, sewers, and other obstructions encountered in the progress of the work shall be furnished by the Contractor at his own expense under the direction of the Engineer. Unsuitable Conditions for Joining Pipe No pipe shall be laid in wet trench conditions which preclude proper bedding, or on frozen trench bottom, or when in the opinion of the Engineer the trench conditions or the weather are unsuitable for proper installation. 14