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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 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 /> 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 /> optimum moisture content, and compact to required depth and percentage of <br /> maximum density. <br /> E. Place backfill and fill materials in layers of 6 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 /> 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 /> 3.04 GRADING <br /> A. Grading Outside Building Lines: Grade areas adjacent to building lines to drain <br /> away from structures and to prevent ponding and as follows: <br /> 1. Finish to within not more than 0.10 ft. above or below required subgrade <br /> elevations. <br /> 2. Walks: Shape surface to line, grade and cross-section, with finish surface <br /> not more than 0.10 ft. above or below required subgrade elevation. <br /> 3. Pavements: Shape surface to line, grade and cross-section, with finish <br /> surface 1/2 in. above or below required subgrade elevation. <br /> B. Grading Surface of Fill under Building Slabs: Grade smooth and even, free of <br /> voids, compacted as specified, and to 1/2 in. below required elevation. <br /> 08/12 02200-4 11-4179 <br />