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1 <br />1 <br />3. Provide and maintain pumps, well points, sumps, suction and discharge lines, and <br />other dewatering system components necessary to convey water away from <br />excavations. <br />G. Stockpile satisfactory excavated materials where directed, until required for backfill or fill. <br />Place, grade and shape stockpiles for proper drainage. <br />H. Excavation for Trenches: Dig trenches to the uniform width required for particular item to <br />be installed, sufficiently wide to provide ample working room. Provide minimum 6 in. <br />clearance on each side of pipe or conduit. <br />1. Excavate trenches to depth indicated or required for indicated flow lines and <br />invert elevations. <br />2. Where rock is encountered, carry excavation 6 in. below scheduled elevation and <br />backfill with a 6 in. layer of crushed stone or gravel prior to installation of pipe. <br />3. For pipes or conduit 5 in. or less, excavate to indicated depths. Hand excavate <br />bottom cut to accurate elevations and support pipe or conduit on undisturbed soil. <br />4. For pipes or conduit 6 in. or larger, tanks and other work indicated to receive <br />subbase, excavate to subbase depth indicated, or, if not otherwise indicated, to 6 <br />in. below bottom of work to be supported. <br />5. Except as otherwise indicated, excavate for exterior water - bearing piping so top of <br />piping is minimum Y -6" below finished grade. <br />6. Grade bottoms of trenches as indicated, notching under pipe bells to provide solid <br />bearing for entire body of pipe. <br />Do not backfill trenches until tests and inspections have been made and backfilling <br />authorized by Engineer. <br />3.02 COMPACTION <br />' 12/04 <br />A. Areas to be compacted shall be moistened and compacted by either rolling, tamping or any <br />other approved method by the Engineer in order to obtain a minimum 90% standard <br />proctor density for the foundation, bedding, haunching, and initial backfill, and a <br />minimum of 85% standard proctor density for the final backfill. The Contractor shall <br />inspect all compacted areas prior to further construction operations to ensure that <br />satisfactory compaction has been obtained. All backfill adjacent to structures and pipes <br />shall be compacted to a density of not less than 100 percent of the maximum standard <br />proctor density. If density tests are required, such tests shall be made as directed by the <br />Engineer at the expense of the Contractor. The Contractor shall instruct the testing <br />laboratory to forward copies of all test reports to the Engineer. Written notice from the <br />Contractor shall precede completion of compaction operations by at least two working <br />days. <br />B. Moisture Control: Where subgrade or layer of soil material must be moisture conditioned <br />before compaction, uniformly apply clean water to surface of subgrade, or layer of soil <br />02200 -3 04 -4801 <br />