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m <br /> G. Final Backfill: <br /> 1 1. Final backfill may be Class I, II, or III and must be placed and compacted <br /> in 12" maximum lifts and compacted to a minimum of 85% standard <br /> proctor density to prevent excessive settlement at the surface. <br /> H. When existing ground surface has a density less than that specified for particular <br /> area classification, break up ground surface, pulverize, moisture-condition to <br /> optimum moisture content, and compact to required depth and percentage of <br /> maximum density. <br /> I. Before compaction, moisten or aerate each layer as necessary to provide <br /> optimum moisture content. Do not place backfill or fill material on surfaces that <br /> are muddy, frozen, or contain frost or ice. <br /> J. Place backfill and fill materials evenly adjacent to structures, without wedging <br /> against structures or displacement of piping or conduit. Compaction equipment <br /> used within 10 ft. of buried walls and soil supported structures shall not exceed <br /> 2000 lbs. <br /> 3.06 COMPACTION <br /> A. Areas to be compacted shall be moistened and compacted by either rolling, <br /> tamping or any other approved method by the Engineer in order to obtain a <br /> minimum 90% standard proctor density for the foundation, bedding, haunching, <br /> and initial backfill, and a minimum of 85% standard proctor density for the final <br /> backfill. The Contractor shall inspect all compacted areas prior to further <br /> construction operations to ensure that satisfactory compaction has been <br /> obtained. All backfill adjacent to structures and pipes shall be compacted to a <br /> density of not less than 100 percent of the maximum standard proctor density. If <br /> density tests are required, such tests shall be made as directed by the Engineer <br /> at the expense of the Contractor. The Contractor shall instruct the testing <br /> laboratory to forward copies of all test reports to the Engineer. Written notice <br /> 1 from the Contractor shall precede completion of compaction operations by at <br /> least two working days. <br /> B. Moisture Control: Where subgrade or layer of soil material must be moisture <br /> conditioned before compaction, uniformly apply clean water to surface of <br /> subgrade, or layer of soil material, to prevent free water appearing on surface <br /> during or subsequent to compaction operations. <br /> 1. Remove and replace, or scarify and air dry, soil material that is too wet to <br /> permit compaction to specified density. <br /> 2. Moisture content of soil shall be within 2% of the optimum. <br /> 1 3. Soil material that has been removed because it is too wet to permit <br /> compaction, but is otherwise satisfactory may be stockpiled or spread <br /> 1 and allowed to dry. Assist drying by discing harrowing or pulverizing until <br /> moisture content is reduced to satisfactory value. <br /> 05/08 02221-10 05-4893 <br />