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<br />Attendant Booth Additions 31 20 00 - 7 <br />Orange County, North Carolina AUGUST 2025 <br />TRC PN: 670493 <br /> <br />2. Remove and replace, or scarify and air dry otherwise satisfactory soil <br />material that exceeds optimum moisture content by 2 percent and is too <br />wet to compact to specified dry unit weight. <br />3.12 COMPACTION OF SOIL BACKFILLS AND FILLS <br />A. Place backfill and fill soil materials in layers not more than 8 inches in loose <br />depth for material compacted by heavy compaction equipment, and not more <br />than 4 inches in loose depth for material compacted by hand-operated tampers. <br />B. Place backfill and fill soil materials evenly on all sides of structures to required <br />elevations, and uniformly along the full length of each structure. <br />C. Compact soil materials to not less than the following percentages of maximum <br />dry unit weight according to ASTM D 698: <br />1. Under structures, building slabs, concrete slabs, and pavements, scarify <br />and recompact top 12 inches of existing subgrade and each layer of <br />backfill or fill soil material at 98 percent of its respective maximum dry <br />density and within 2+/- % of its optimum moisture content. <br />2. Under lawn or unpaved areas, scarify and recompact top 6 inches below <br />subgrade and compact each layer of backfill or fill soil material at 90 <br />percent. <br />3. For utility trenches, compact each layer of initial and fi nal backfill soil <br />material at 90 percent in unpaved areas and 98 percent under pavement. <br />3.13 GRADING <br />A. General: Uniformly grade areas to a smooth surface, free of irregular surface <br />changes. Comply with compaction requirements and grade to cross sections, <br />lines, and elevations indicated. <br />B. Site Grading: Slope grades to direct water away from buildings and to prevent <br />ponding. Finish subgrades to required elevations within the following <br />tolerances: <br />1. Lawn or Unpaved Areas: Plus or minus 1 inch. <br />2. Pavements: Plus or minus 1/2 inch. <br />C. Grading inside Building Lines: Finish subgrade to a tolerance of 1/2 inch when <br />tested with a 10-foot straightedge. <br />3.14 SUBBASE AND BASE COURSES <br />A. Place subbase and base course on subgrades free of mud, frost, snow, or ice. <br />Docusign Envelope ID: D6604BD6-B857-409E-B157-28C713186997