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1 <br />1 <br />1� <br />�J <br />I <br />5. Except as otherwise indicated, excavate for exterior <br />water - bearing piping so top of piping is minimum 3' -6" below <br />finished grade. <br />6. Grade bottoms of trenches as indicated, notching under pipe <br />bells to provide solid bearing for entire body of pipe. <br />Do not backfill trenches until tests and inspections have been made <br />and 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 <br />to obtain the desired density. The Contractor shall inspect all <br />compacted areas prior to further construction operations to ensure that <br />satisfactory compaction has been obtained. All backfill adjacent to <br />structures and pipes, shall be compacted to a density of not less than <br />100 percent of the maximum density as determined by AASHTO T -99. <br />Density tests are required, such tests shall be made as directed by the <br />Engineer at the expense of the Contractor. The Contractor shall <br />instruct the testing laboratory to forward copies of all test reports to <br />the Engineer. <br />B. Remove and replace, or scarify and air dry, soil material that is too wet <br />to permit compaction to specified density. <br />3.03 BACKFILL AND FILL <br />09/03 <br />A. Place specified soil material in layers to required subgrade elevations: <br />1. In excavations, use satisfactory excavated or borrow material. <br />2. Under grassed areas, use satisfactory excavated or borrow <br />material. <br />3. Under walks and pavements, use subbase material, or <br />satisfactory excavated or borrow material, or combination of <br />both. Place shoulders along edges of subbase course to prevent <br />lateral movement with satisfactory excavated or borrow <br />material. <br />4. Under steps, use subbase material. <br />5. Under building slabs, use drainage fill material. <br />6. Under piping and conduit, use subbase material where subbase <br />is indicated under piping or conduit; shape to fit bottom 90 <br />degrees of cylinder. <br />B. Backfill excavations as promptly as work permits, but not until <br />completion of the following: <br />02200 -4 03- 4138.A -R <br />