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r J 1 I I 1 - ] I ",J- '" J I .J .J ,J J J J J J The primary line and grade will be performed as specified in Special Conditions Section 100. No deviation from the required line or grade will be allowed except with the consent of the ENGINEER. Trench excavation and bedding preparations shall proceed ahead of pipe placement as will pennit proper placement and joiriing of the pipe lPld fittings at the prescribed grade and alignment without unnecessary hindrance~ - Every reasonable precaution shall be taken to prevent foreign materials from entering the pipe while it is being placed in the line. Pipe and m.anhole materials shall be carefully lowered into laying position by the use of suitable restraining devices. Under no circumstances shall the pipe be dropped or dumped into the trench. Before being lowered into laying position, the CONTRACTOR shall make a thorough visual inspection of each pipe section and appurtenant units to detect damage, foreign matter needing removal, or unsound conditions that may need corrective action or be cause for rejection. Inspection procedure shall be as approved by the ENGINEER, with special methods being required as he deems necessary to check out suspected _ defects more definitely. The CONTMCTOR shall inform the ENGINEER of any defects discovered andthe ENGINEER will prescribe the required corrective actions or order rejection and prompt removal from the site. Immediately before placement, the joint surfaces of each pipe section and fiuing shall be inspected for the presence of foreign matter, coating blisters, rough edges or projections, and any imperfections so detected shall be corrected by cleaning, trinuning, or repair as needed. All pipe shall be laid using grade boards or laser, furnished and set by the CONTRACTOR according to the grade stakes established by the ENGINEER or his . representative. No pipe shall be laid unless there is a minimum offour grade boards set to check the proper grade and alignment ahead. The CONTRACTOR shall provide and use a suitable grade rod to insure the p~oper grade of the pipe. Grade Boards shall be no more than 25 feet apart. The CONTRACTOR 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 CONTRACTOR shall provide competent workmen to operate the laser equipment. At the 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 connections, 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 downgrad'e 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 effectively closing the open ends of each pipe section before it is lowered into laying position, and -- 400-3