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9/2/2020 <br /> <br />31 20 00 EARTH MOVING Page 11 of 13 <br />3.16 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 Rough Grading: Slope grades to direct water away from buildings and to prevent ponding. <br />Finish subgrades to elevations required to achieve indicated finish elevations, within the <br />following subgrade tolerances: <br />1. Turf or Unpaved Areas: Plus or minus 1 inch. <br />2. Walks: Plus or minus 1 inch. <br />3. Pavements: Plus or minus 1/2 inch. <br />C. Grading inside Building Lines: Finish subgrade to a tolerance of 1/2 inch when tested with a 10- <br />footstraightedge. <br />3.17 SUBSURFACE DRAINAGE <br />A. Subdrainage Pipe: Specified in Section 33 46 00 "Subdrainage." <br />3.18 SUBBASE AND BASE COURSES UNDER PAVEMENTS AND WALKS <br />A. Place subbase course on subgrades free of mud, frost, snow, or ice. <br />B. On prepared subgrade, place subbase course under pavements and walks as follows: <br />1. Shape subbase course to required crown elevations and cross-slope grades. <br />2. Compact subbase course at optimum moisture content to required grades, lines, cross <br />sections, and thickness to not less than 98 percent of maximum dry unit weight according <br />to ASTM D 698. <br />C. Pavement Shoulders: Place shoulders along edges of subbase course to prevent lateral movement. <br />Construct shoulders, at least 12 inches wide, of satisfactory soil materials and compact <br />simultaneously with each subbase layer to not less than 98 percent of maximum dry unit weight <br />according to ASTM D 698. <br />3.19 DRAINAGE COURSE UNDER CONCRETE SLABS-ON-GRADE <br />A. Place drainage course on subgrades free of mud, frost, snow, or ice. <br />B. On prepared subgrade, place and compact drainage course under cast-in-place concrete slabs-on- <br />grade as follows: <br />1. Install subdrainage geotextile on prepared subgrade according to manufacturer's written <br />instructions, overlapping sides and ends. <br />DocuSign Envelope ID: 7D9ACD4F-8F6C-42B6-9ADB-C60032DB6D03