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�, � �' � ,� 500-3 � � � •� �� •y,.� '� ►1� 503. 1 503.2 503.3 � •: .�_:�._ ..� . . _ The inspeetion and respon�ibility of materials xill be as specified in Standard Specification� Section 3a3.1• .�_� :•: •� • :}•�_;�. . _ .} Excavation. preparatioa of trench and restoration is desaribed in Sec:tion 600 of the Standard Speaifioations. p e Manhole ,�p,¢, Cateh Basin Plaeement Pracedure The primary line and grade will be performed as specified ' � � . No deviation from the required line or grade will be allowed except with the conseat of the Engineer. , �, �' � �. Trench excavation and bedding preparations shall proceed ahead of pipe placement as Will permit proper plaaement and joining of the pipe and fittings at the preseribed 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, The pipe, manhole and catch basin materials shall be carefully loNered 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 loNered 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 far rejection. Inspection procedure shall be as approved by the Engineer, with special methods being required as he deems necessary to eheck out suspected defeets more definitely. The Contractor shall inform the Engineer of any defeets discovered and the Engineer will prescribe the required corrective actions or order rejection,and prompt remavaJ. from the site. Immediately before placement, the joint surfaces of each pipe section and fitting shall be inspected for the presence of foreign matter, coating blisters, rough edges or projections, and any imperfections so detected shall be correeted by eleaning, trimming, or repair as needed. All pipe shall be layed using grade boards, furnished and set by the � Contractor according to the grade atakes established by th� 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 alignment ahead. The Contractor 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 Contractor may use laser equipment in lieu of grade boards and strings to set pipe grade and alignment. Hoaever, the Contractor shall check the grades at a frequeney not to exceed 100 feet. The Contractor shall provide competent workmen to operate the laser equipment. � �