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STORMWATER REPAIRS TO WHITTED BUILDING <br /> HILLSBOROUGH,NC 03/26/13 <br /> concrete fill, with 28-day compressive strength of 2500 psi (17.2 MPa), may be used when <br /> approved by Architect. <br /> 1. Fill unauthorized excavations under other construction or utility pipe as directed by <br /> Architect. <br /> 3.9 BACKFILL <br /> A. Place and compact backfill in excavations promptly,but not before completing the following: <br /> 1. Construction below finish grade including,where applicable, subdrainage, dampproofing, <br /> waterproofing, and perimeter insulation. <br /> 2. Surveying locations of underground utilities for Record Documents. <br /> 3. Removing trash and debris. <br /> B. Place backfill on subgrades free of mud. <br /> 3.10 SOIL FILL <br /> A. Place and compact fill material in layers to required elevations as follows: <br /> 1. Under grass and planted areas,use satisfactory soil material. <br /> 2. Under walks and pavements, use satisfactory soil material. <br /> 3. Under steps and ramps, use engineered fill. <br /> 4. Under building slabs,use engineered fill. <br /> 5. Under footings and foundations,use engineered fill. <br /> B. Place soil fill on subgrades free of mud. <br /> 3.11 SOIL MOISTURE CONTROL <br /> A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil layer before <br /> compaction to within 2 percent of optimum moisture content. <br /> 1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain <br /> frost or ice. <br /> 2. Remove and replace, or scarify and air dry otherwise satisfactory soil material that <br /> exceeds optimum moisture content by 2 percent and is too wet to compact to specified <br /> 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 6 inches (150 mm) in loose depth <br /> for material compacted by heavy compaction equipment, and not more than 4 inches (100 mm) <br /> 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 elevations, and <br /> uniformly along the full length of each structure. <br /> EARTHWORK 02300- 5 <br />