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500-4 I'; I 'I) Immediately before placement, the joint surfaces of each pipe section and fitting shall be i~spected for the presence of foreign matter, coating Dlisters, rough edges or projections, and an~ .imperfections so. detected shall be corrected by cleaning, trimming, or repair as needed. All pipe shall be laid usinq grade boards, furnished and set by the Contractor accordinq to ~he grade stakes established by the ENGINEER or his representative. No ,pipe shall be laid unless there is a minimum of four grade boards set to check the proper grade and al'ignment ahead. The Cont.ractor shall provide and use a suitable grade rod to insure the proper grade of the pipe. Grade Boards shall be no more than 25 feet apart. The Contrac- tor may use laser equipment in lieu of grade boards and strings to set. pipe grade and alignment. However, the Contractor shall check the grades at. a frequency not. to exceed 100 feet, The Contraotor shall provide competent workmen to operate the laser equipment. ' At"that time of pipe placement, the bedding conditions shall be such as to provide uniform and continuous support for the pipe between bell holes. Bell holes shall be excavated as necessary to make the joint connectionsf but they shall be no larger than would be adequate. No 'pipe material-- shall be laid in water nor when the trench or bedding conditions are otherwise unsuitable or improper. Unless otherwise permitted by the ENGINEER, bell and spigot pipe shall be laid with the bell ends facing upgrade and the laying shall start at-the downg+ade end and proceed upgrade. When placement or handling precautions prove inadequate, in ,the ENGINEER'S opinion, the Contractor shall provide and install suitable plugs or caps .ffeotively o~osing the open ends of each pipe section before it is lowered into laying position, .and they shall remain so covered until 'removal is necessary for connec- tion of an adjoining unit. As each length of bell and spigot pipe is placed in laying position, the spigot. end shall ,be centered in the bell and the pipe forced hom~ and brought to. corr~ct line and grade. The pipe shall be secured in place with approved backfill material, which shall be thoroughly compaQted around the pipe as described in section 302.7. The joint areas shall remain exposed and precautions shall be taken to p~event the soil' from enterinq the joint space, until ~e joint seal is effected. Whenever existing utility structures or branch connections leading to main sewers or t.o main drains, or other conduits, ducts, pipes, or structures present obstructions to the grade and aliqnment of the pipe, they shall be permanently supported, removed, relocated or reconstructed ~y the Contractor involved. In those instance~ where their relocation or reconst.ruction is I); II Ii I: II, i, , I} 1:1 I~ J, II I~ II! ,Ii) 1\ It;: II; 1'1; j IJ