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STORMWATER REPAIRS TO WHITTED BUILDING <br /> HILLSBOROUGH,NC 03/26/13 <br /> C. Pavement Shoulders: Place shoulders along edges of subbase and base course to prevent lateral <br /> movement. Construct shoulders, at least 12 inches(300 mm)wide, of satisfactory soil materials <br /> and compact simultaneously with each subbase and base layer to not less than 95 percent of <br /> maximum dry unit weight according to ASTM D 698. <br /> 3.15 DRAINAGE COURSE <br /> A. Place drainage course on subgrades free of mud. <br /> B. On prepared subgrade, place and compact drainage course under cast-in-place concrete slabs- <br /> on-grade as follows: <br /> 1. Place drainage course 6 inches(150 mm)or less in compacted thickness in a single layer. <br /> 2. Place drainage course that exceeds 6 inches(150 mm)in compacted thickness in layers of <br /> equal thickness,with no compacted layer more than 6 inches (150 mm)thick or less than <br /> 3 inches(75 mm)thick. <br /> 3. Compact each layer of drainage course to required cross sections and thicknesses to not <br /> less than 98 percent of maximum dry unit weight according to ASTM D 698. <br /> 3.16 FIELD QUALITY CONTROL <br /> A. Testing Agency: Owner will engage a qualified independent geotechnical engineering testing <br /> agency to perform field quality-control testing. <br /> B. Allow testing agency to inspect and test subgrades and each fill or backfill layer. Proceed with <br /> subsequent earthwork only after test results for previously completed work comply with <br /> requirements. <br /> C. Footing Subgrade: At footing subgrades, at least one test of each soil stratum will be performed <br /> to verify design bearing capacities. Subsequent verification and approval of other footing <br /> subgrades may be based on a visual comparison of subgrade with tested subgrade when <br /> approved by Architect. <br /> D. Testing agency will test compaction of soils in place according to ASTM D 1556, <br /> ASTM D 2167, ASTM D 2922, and ASTM D 2937, as applicable. Tests will be performed at <br /> the following locations and frequencies: <br /> 1. Paved and Building Slab Areas: At subgrade and at each compacted fill and backfill <br /> layer, at least 1 test for every 2000 sq. ft. (186 sq. m) or less of paved area or building <br /> slab,but in no case fewer than 3 tests. <br /> 2. Foundation Wall Backfill: At each compacted backfill layer, at least 1 test for each 100 <br /> feet(30 m)or less of wall length,but no fewer than 2 tests. <br /> 3. Trench Backfill: At each compacted initial and final backfill layer, at least 1 test for each <br /> 150 feet(46 m)or less of trench length, but no fewer than 2 tests. <br /> E. When testing agency reports that subgrades, fills, or backfills have not achieved degree of <br /> compaction specified, scarify and moisten or aerate, or remove and replace soil to depth <br /> required;recompact and retest until specified compaction is obtained. <br /> EARTHWORK 02300- 7 <br />