Orange County NC Website
Browse       Search
STORMWATER REPAIRS TO WHITTED BUILDING <br /> HILLSBOROUGH,NC 03/26/13 <br /> C. Compact soil materials to not less than the following percentages of maximum dry unit weight <br /> according to ASTM D 698: <br /> 1. Under structures, building slabs, steps, and pavements, scarify and recompact top 12 <br /> inches (300 mm) of existing subgrade and each layer of backfill or fill soil material at 98 <br /> percent. <br /> 2. Under walkways, scarify and recompact top 6 inches (150 mm) below subgrade and <br /> compact each layer of backfill or fill soil material at 95 percent. <br /> 3. Under lawn or unpaved areas, scarify and recompact top 6 inches (150 mm) below <br /> subgrade and compact each layer of backfill or fill soil material at 90 percent. <br /> 4. For utility trenches, compact each layer of initial and final backfill soil material at 95 <br /> percent. <br /> 3.13 GRADING <br /> A. General: Uniformly grade areas to a smooth surface, free of irregular surface changes. Comply <br /> with compaction requirements and grade to cross sections, lines, and elevations indicated. <br /> 1. Provide a smooth transition between adjacent existing grades and new grades. <br /> 2. Cut out soft spots, fill low spots, and trim high spots to comply with required surface <br /> tolerances. <br /> B. Site Grading: Slope grades to direct water away from buildings and to prevent ponding. Finish <br /> subgrades to required elevations within the following tolerances: <br /> 1. Lawn or Unpaved Areas: Plus or minus 1 inch(25 mm). <br /> 2. Walks: Plus or minus 1 inch(25 mm). <br /> 3. Pavements: Plus or minus 1/2 inch(13 mm). <br /> C. Grading inside Building Lines: Finish subgrade to a tolerance of 1/2 inch (13 mm)when tested <br /> with a 10-foot(3-m)straightedge. <br /> 3.14 SUBBASE AND BASE COURSES <br /> A. Place subbase and base course on subgrades free of mud. <br /> B. On prepared subgrade,place subbase and base course under pavements and walks as follows: <br /> 1. Shape subbase and base course to required crown elevations and cross-slope grades. <br /> 2. Place subbase and base course 6 inches (150 mm) or less in compacted thickness in a <br /> single layer. <br /> 3. Place subbase and base course that exceeds 6 inches (150 mm)in compacted thickness in <br /> layers of equal thickness,with no compacted layer more than 6 inches (150 mm)thick or <br /> less than 3 inches(75 mm)thick. <br /> 4. Compact subbase and base course at optimum moisture content to required grades, lines, <br /> cross sections, and thickness to not less than 95 percent of maximum dry unit weight <br /> according to ASTM D 698. <br /> EARTHWORK 02300- 6 <br />