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Page 17 FE 382- 063-00 <br /> Engineered Fill : The on-site soils are predominantly silty <br /> sands intermixed with debris such as trash , glass , etc . These <br /> soils will not be suitable for use as engineered fill . Import <br /> fill soil should be nonexpansive granular material and , prior to <br /> use , should be approved by the Soils Engineer. <br /> Fill soil should be placed in lifts approximately 6 inches <br /> thick , moisture- conditioned as necessary , and compacted to <br /> achieve a dry density of at least 95 percent of the maximum dry <br /> density as determined by ASTM Test Method D1557-78 . Additional <br /> lifts should not be placed if the previous lift did not meet the <br /> required dry density or if soil conditions are not stable. <br /> Utility Trench Backfill : Utility trench backfill placed in <br /> or adjacent to building areas and paved exterior slabs should be <br /> compacted to at least 95 percent relative compaction based on <br /> ASTM Test Method D1557- 78 . When utility trench backfills are <br /> deemed nonstructural backfills as determined by the Soils <br /> Engineer , the surface 2 feet of fill should be compacted to .at <br /> least- 95 percent relative compaction, and fill material below the <br /> surface 2 feet should be compacted to 90 percent relative <br /> compaction. The Contractor should use appropriate equipment and <br /> methods to avoid damage to the utilities and/or structures during <br /> placement and compaction of the backfill material. <br /> Ile Foundation Engineers, Inc. <br />