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E. Placement and Compaction: Allowable thickness of}ill Iifts wfll depend on the materlal <br /> type and compaction equipment used. In no case place backfill and flll mate►ials in <br /> layers more than 8 inches in loose depth for material compacted by heavy compaction <br /> equipment, and more than 4 fnches fn loose depth for material compacted by hand- <br /> operated tampers <br /> 1. Before compaction, moisten or aerate each layer as necessary to provide the <br /> optimum moisture content. <br /> 2. Compact each layer to required percentage of maximum dry density or relat(ve dry <br /> density for each area classiflcation. <br /> 3. Do not place backflll or flll material on suKaces muddy, frozen, or conta(ning frost or <br /> ice. <br /> 4. Place backftll and fill materi3�s in such a manner as to prevent wedging adion of <br /> backfill against structures. <br /> 3.03 COMPACTION <br /> A. General: Control sofl compactfon during constructlon provfding minimum percentage of <br /> density specifled for each area. <br /> B. Percentage oi Maxir,ium Density Requirements: Compact soil to not less than the <br /> following percentages o+ maximum dry density detertnined in accordance with ASTM <br /> D 1557 ("MODIFIED Proctor"): <br /> 1. Structures: Compact top 12 Inches of subgrade where exposed, and each �ayer of <br /> backflll or fili material to 95 percent of maximum dry density. <br /> 2. Lawn or Unpaved Areas: Compact top 12 inchos of subgrade and each layer of <br /> backfill or ffll material to 85 percent of maximum dry density. <br /> C. Moisture Control: Where subgrade or layer of sofl material must be moisture � <br /> condltioned before compaction, unifortnly apply w�ter to surtace of subgrade, or layer of � <br /> soil mate�ial. Prevent free water appearing on surtace during or subsequent to � <br /> compaction operatfons. <br /> 1. Remove and replace, or sca�ify and air dry, soil mate�lal too wet to permit <br /> compacdon to specified density. <br /> 2. Soil material removed becau.�e ft fs too wet to pertnit compaction may be stockpiled <br /> or spread and allowed to dry. Assist drying by discfng, harrowing or pulverizing until <br /> mofsture content is reduced to a satisfactcry value. <br /> June 11, 2001 02300-5 � <br />