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rlll"� <br />G. Final Backfill: <br />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 />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 />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 />and allowed to dry. Assist drying by discing harrowing or pulverizing until <br />moisture content is reduced to satisfactory value. <br />06/07 02221 -10 03 -4197 <br />