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IJ <br />6. Grade bottoms of trenches as indicated, notching under pipe bells <br />to provide solid bearing for entire body of pipe. <br />Do not backfill trenches until tests and inspections have been made and <br />backfilling authorized by Engineer. <br />3.02 COMPACTION <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />oNO6 <br />A. Areas to be compacted shall be moistened and compacted by either <br />rolling, tamping or any other approved method by the Engineer in order to <br />obtain a minimum 90% standard proctor density for the foundation, <br />bedding, haunching, and initial backfill, and a minimum of 85% standard <br />proctor density for the final backfill. The Contractor shall inspect all <br />compacted areas prior to further construction operations to ensure that <br />satisfactory compaction has been obtained. All backfill adjacent to <br />structures and pipes shall be compacted to a density of not less than 100 <br />percent of the maximum standard proctor density. If density tests are <br />required, such tests shall be made as directed by the Engineer at the <br />expense of the Contractor. The Contractor shall instruct the testing <br />laboratory to forward copies of all test reports to the Engineer. Written <br />notice from the Contractor shall precede completion of compaction <br />operations by at least two working days. <br />B. 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. 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 <br />spread and allowed to dry. Assist drying by discing harrowing or <br />pulverizing until moisture content is reduced to satisfactory value. <br />C. Place fill material in layers not more than 12- inches loose depth for <br />material compacted by hand - operated tampers. Use manually operated <br />sled -type vibratory compactors next to structures and confined areas not <br />accessible to heavy mechanical compaction equipment. <br />D. If the Engineer shall determine that added moisture is required, water <br />shall be applied by sprinkler tanks or other sprinkler systems, which will <br />insure uniform distribution of the water over the area to be treated, <br />02200 -4 03-4138.0 <br />