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, 602.102 Continued. � � �' ,� � � l � � �� �' � �' � 600-2 Granular Backfill ------ Placed beloW the surface base course, if any, as the second stage of baekfill, to minimize trench settlement and provide support for surface improvements. In each case above, unless otherwise indicated, the lower limits of any particular zone shall be the top surface of the next lower course as construeted. The upper limits of each zone are established to define variable needs for material gradation and compaction or void eontent taking into consideration the sequence of construetion and other conditions. The material use and zone designations deseribed above shall only serve to fulfill the objectives and shall not be eonstrued to restrict the use of any particular material in other zones where the gradation requirements are met. 603.000 CONSTRUCTION Trench Excavation All work shall be done by open trench excavation except jacked or augured pipe designated on the plans or as direeted by the Engineer. TOPSOIL shall be stripped from the trench and stockpiled to be used over all disturbed areas to be seeded or sodded. Stripping, stockpiling and respreading topsoil will be considered inc idental to the project. TRENCH EXCAVATION shall be dug to the alignment and depth shown on the plans and only 100 feet in advance of the pipe laying. The trench sha71 be braced and drained so that workmen may work safely and efficiently therein. TRENCH WATER shall be drained from the trench into natural drainage channels or storm sewers and shall be considered incidental to construction. Draining trench water irto sanitary sewers will not be permitted. BRACID AND SHEETED TRENCHES shall be put in place and maintained as may be required to support the side of the excavation and to prevent any movement which may in any way endanger personnel or injure or delay the work or endanger adjacen� buildings or other structures. Where sheeting and bracing are used� the trench width sha11 be increased accordingly. Trench sheeting shall remain in place until pipe has been laid, tested for defects and repaired if necessary, and the earth around it compaeted to a depth of one foot (1') over the top of the pipe. Tt shall be the Contraetor�s responsibility for compliance therein. EXCAVATED MATERIAL shall be piled in a manner that will not endanger the work and that will avoid obstructing sidewalks, driveways and drainage. Gutters shall be kept clear or other satisfaetory provi9ions made for street drainage. � � , r i i �