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1 <br />11 <br />L� <br />J <br />3.04 COMPACTION <br />1 07116 <br />A. General: Control soil compaction during construction providing minimum <br />percentage of density specified on the structural drawings for each area <br />classification. It shall be the Contractor's responsibility to notify the <br />Engineer in writing that penetration tests can be performed. Written <br />notice from the Contractor shall precede completion of compaction <br />operations by at least two working days. <br />B. Percentage of Maximum Density Requirements: <br />1. Compact soil to not less than the following percentages of <br />maximum dry density in accordance with AASHTO T -180. <br />a. Underneath structures and 5 feet 0 inches around perimeter <br />of foundation: Compact top 12- inches of subgrade and <br />each layer of backfill or fill material at 98% maximum dry <br />density. <br />b. Slabs and Footings: Compact top 12- inches of subgrade <br />and each layer of backfill or fill material at 98% maximum <br />dry density. <br />C. Unpaved Areas: Compact top 6- inches of subgrade 95% <br />maximum dry density <br />d. Walkways: Compact to 6- inches of subgrade 95% <br />maximum dry density <br />e. Pavements: Compact top 12- inches of subgrade at 100% <br />maximum dry density <br />2. Moisture content of soil shall be within 2% of the optimum. <br />C. Moisture Control: Where subgrade or layer of soil material must be <br />moisture conditioned before compaction, uniformly apply clean water to <br />surface of subgrade, or layer of soil material, to prevent free water <br />appearing on surface during or subsequent to compaction operations. <br />1. Remove and replace, or scarify and air dry, soil material that is too <br />wet to permit compaction to specified density. <br />2. Soil material that has been removed because it is too wet to permit <br />compaction, but is otherwise satisfactory may be stockpiled or <br />spread and allowed to dry. Assist drying by discing harrowing or <br />pulverizing until moisture content is reduced to satisfactory value. <br />D. Structural fill shall be placed in layers not more than 9- inches loose depth <br />for material compacted by heavy compaction equipment. Each layer shall <br />02220 -12 05 -5564 <br />