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600-2 I I I I: I Granular Bedding - - - - - - Place below the pipe midpoint, prior to pipe installation, to facilitate proper shaping and achieve uniform pipe support. Granular Backfill - - - - - - Placed below the surface base course, if any, as the second stage of backfill, to minimize trench settlement and provide support for surface improvements. All work shall be done by open trench excavation except jacked or augured pipe designated on the plans'or as directed by the ENGINEER. . In each case above, unless otherwise indicated, the lower limits I of any particular zone shall be the top surface of the next lower course as constructed. The upper limits of each zone are established to define variable needs for material gradation and I compaction or void content taking into consideration the, sequence of construction and other conditions. The material use and zone designations described above shall only serve to ful- I fill the objectives and shall not be construed to restrict the use of any particular material in other zones where the grada- tion re9Uireme~ts are met. I I', 'II! '.'1 ,II ) 1'1 Iii :.,.J 1"1 J II ,J I! I} 603.000 CONSTRUCTION Trench Excavation TOPSOIL shall be stripped f~om the trench and stockpiled to be used over all disturbed areas to be, seeded or sodded. stripping, stockpiling,an4 respreadinq topsoil will be con- sidered incidental 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 l~yinq. The trench shall be braced and drained so that workmen may work safely and efficiently th&rein. ' 'T.RENCH'WATER shall be drained from the trench into natural drainage channels or storm'sewers and shall be considered incidental to construction. Draining trench water into sanitary sewers will no~ be permitted. . ' BRACED AND SHEETED ~NCHES 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 adjacent buildings or other structures. Where sheeting and bracing are used, the trench width shall 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 oompaoted to a depth of one foot (1') over the top of the pipe. It shall be the CONTRACTOR's responsibility' fo~ complianoe therein.