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compaction has been obtained. All backfill adjacent to structures and <br />pipes, shall be compacted to a density of not less than 100 percent of the <br />maximum density as determined by AASHTO T -99. Density tests are <br />required, such tests shall be made as directed by the Engineer at the <br />expense of the Contractor. The Contractor shall instruct the testing <br />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 <br />permit compaction to specified density. <br />3.03 BACKFILL AND FILL <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 satisfactory <br />excavated or borrow material, or combination of both. Place <br />shoulders along edges of subbase course to prevent lateral <br />movement with satisfactory excavated or borrow 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 is <br />indicated under piping or conduit; shape to fit bottom 90 degrees of <br />cylinder. <br />B. Backfill excavations as promptly as work permits, but not until completion <br />of the following: <br />1. Acceptance of construction below finish grade including <br />waterproofing and perimeter insulation. <br />2. Inspection, testing, approval, and recording locations of <br />underground utilities. <br />3. Removal of shoring and bracing, and backfilling of voids with <br />satisfactory materials. <br />C. Remove vegetation, debris, unsatisfactory soil materials, obstructions, <br />and deleterious materials from ground surface prior to placement of fills. <br />Plow strip, or break -up sloped surfaces steeper than 1 vertical to 4 <br />horizontal so that fill material will bond with existing surface. <br />D. When existing ground surface has a density less than that specified for <br />particular area classification, break up ground surface, pulverize, <br />moisture - condition to optimum moisture content, and compact to required <br />depth and percentage of maximum density. <br />E. Place backfill and fill materials in layers of 8 in. loose depth for material <br />compacted by heavy compaction equipment, and 4 in. in loose depth for <br />' material compacted by hand operated tampers. <br />December 2006 02200 -4 06 -5723 <br />