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3. Provide and maintain pumps, well points, sumps, suction and discharge <br />lines, and other dewatering system components necessary to convey <br />water away from excavations. <br />G. Stockpile satisfactory excavated materials where directed, until required for <br />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 room. <br />Provide minimum 6 in. clearance on each side of pipe or conduit. <br />1. Excavate trenches to depth indicated or required for indicated flow lines <br />and invert elevations. <br />a 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 prior to <br />installation of pipe. <br />3. For pipes or conduit 5 in. or less, excavate to indicated depths. Hand <br />excavate bottom cut to accurate elevations and support pipe or conduit <br />on undisturbed soil. <br />I` <br />iv <br />4. For pipes or conduit 6 in. or larger, tanks and other work indicated to <br />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 piping <br />so top of piping is minimum 3' -6" below finished grade. <br />6. Grade bottoms of trenches as indicated, notching under pipe bells to <br />provide solid bearing for entire body of pipe. <br />I. 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 rolling, <br />tamping or any other approved method by the Engineer in order to obtain the <br />desired density. The Contractor shall inspect all compacted areas prior to further <br />construction operations to ensure that satisfactory compaction has been <br />obtained. All backfill adjacent to structures and pipes, shall be compacted to a <br />density of not less than 100 percent of the maximum density as determined by <br />AASHTO T -99. Density tests are required, such tests shall be made as directed <br />by the Engineer at the expense of the Contractor. The Contractor shall instruct <br />the testing laboratory to forward copies of all test reports to the Engineer. <br />B. Remove and replace, or scarify and air dry, soil material that is too wet to permit <br />compaction to specified density. <br />06/07 02200 -3 03 -4197 <br />