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r <br />C. Remove vegetation, debris, unsatisfactory soil materials, obstructions, and <br />deleterious materials from ground surface prior to placement of fills. Plow strip, <br />3.03 BACKFILL AND FILL <br />rA. <br />Place specified soil material in layers to required subgrade elevations: <br />material will bond with existing surface. <br />1. <br />In excavations, use satisfactory excavated or borrow material. <br />2. <br />Under grassed areas, use satisfactory excavated or borrow material. <br />r <br />3. <br />Under walks and pavements, use subbase material, or satisfactory <br />rE. <br />Place backfill and fill materials in layers of 8 in. loose depth for material <br />excavated or borrow material, or combination of both. Place shoulders <br />compacted by heavy compaction equipment, and 4 in. in loose depth for material <br />rcompacted <br />along edges of subbase course to prevent lateral movement with <br />r <br />F. Before compaction, moisten or aerate each layer as necessary to provide <br />satisfactory excavated or borrow material. <br />optimum moisture content. Do not place backfill or fill material on surfaces that <br />4. <br />Under steps, use subbase material. <br />5. <br />Under building slabs, use drainage fill material. <br />6. <br />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 of the <br />following: <br />1. Acceptance of construction below finish grade including waterproofing <br />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 />' <br />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 />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 />' <br />optimum moisture content, and compact to required depth and percentage of <br />maximum density. <br />rE. <br />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 />rcompacted <br />by hand operated tampers. <br />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 05/08 02200 -4 05 -4893 <br />