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1 <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 material. <br /> 3. Under walks and pavements, use subbase material, or satisfactory <br /> excavated or borrow material, or combination of both. Place shoulders <br /> along edges of subbase course to prevent lateral movement with <br /> 1 <br /> 4. satisfactory excavated or borrow material. <br /> 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 /> 1 B. Backfill excavations as promptly as work permits, but not until completion of the <br /> following: <br /> 1. Acceptance of construction below finish grade including waterproofing <br /> i and perimeter insulation. <br /> 2. Inspection, testing, approval, and recording locations of underground <br /> utilities. <br /> ' 3. Removal of shoring and bracing, and backfilling of voids with satisfactory <br /> materials. <br /> t C. Remove vegetation, debris, unsatisfactory soil materials, obstructions, and <br /> deleterious materials from ground surface prior to placement of fills. Plow strip, <br /> or break-up sloped surfaces steeper than 1 vertical to 4 horizontal so that fill <br /> 1 material will bond with existing surface. <br /> D. When existing ground surface has a density less than that specified for particular <br /> area classification, break up ground surface, pulverize, moisture-condition to <br /> optimum moisture content, and compact to required depth and percentage of <br /> maximum density. <br /> 1 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 material <br /> compacted by hand operated tampers. <br /> 1 F. Before compaction, moisten or aerate each layer as necessary to provide <br /> optimum moisture content. Do not place backfill or fill material on surfaces that <br /> are muddy, frozen, or contain frost or ice. <br /> G. Place backfill and fill materials evenly adjacent to structures, without wedging <br /> against structures or displacement of piping or conduit. Compaction equipment <br /> used within 10 ft. of buried walls and soil supported structures shall not exceed <br /> 2000 lbs. <br /> 1 <br /> I <br /> 05/08 02200-4 05-4893 <br />