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1 <br />0 <br />E. Shoring and Bracing: <br />1. Establish requirements for trench shoring and bracing to comply <br />with local codes and authorities having jurisdiction. <br />2. Maintain shoring and bracing in excavations regardless of time <br />period excavations will be open. Carry down shoring and bracing <br />as excavation progresses. <br />F. Dewatering: <br />1. Prevent surface water and subsurface or ground water from flowing <br />into excavations. <br />2. Do not allow water to accumulate in excavations. <br />3. Provide and maintain pumps, well points, sumps, suction and <br />discharge lines, and other dewatering system components <br />necessary to convey water away from excavations. <br />G. Stockpile satisfactory excavated materials where directed, until required <br />for backfill or fill. Place, grade and shape stockpiles for proper drainage. <br />H. Excavation for Trenches: Dig trenches to the uniform width required for <br />particular item to be installed, sufficiently wide to provide ample working <br />room. Provide minimum 6 in. clearance on each side of pipe or conduit. <br />1. Excavate trenches to depth indicated or required for indicated flow <br />lines and invert elevations. <br />2. Where rock is encountered, carry excavation 6 in. below scheduled <br />elevation and backfill with a 6 in. layer of crushed stone or gravel <br />prior to installation of pipe. <br />3. For pipes or conduit 5 in. or less, excavate to indicated depths. <br />Hand excavate bottom cut to accurate elevations and support pipe <br />or conduit on undisturbed soil. <br />4. For pipes or conduit 6 in. or larger, tanks and other work indicated <br />to receive subbase, excavate to subbase depth indicated, or, if not <br />otherwise indicated, to 6 in. below bottom of work to be supported. <br />5. Except as otherwise indicated, excavate for exterior water - bearing <br />piping so top of piping is minimum T -6" below finished grade. <br />6. Grade bottoms of trenches as indicated, notching under pipe bells <br />to provide solid bearing for entire body of pipe. <br />Do not backfill trenches until tests and inspections have been made and <br />backfilling authorized by Engineer. <br />3.02 COMPACTION <br />A. Areas to be compacted shall be moistened and compacted by either <br />rolling, tamping or any other approved method by the Engineer in order to <br />obtain the desired density. The Contractor shall inspect all compacted <br />areas prior to further construction operations to ensure that satisfactory <br />December 2006 02200 -3 06 -5723 <br />1 <br />