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MainPlace Mall Transformation Project 12126.001 <br />All fill soils should be placed in loose lifts not exceeding 8 inches, <br />moisture -conditioned to at least 2 to 4 percentage points above optimum <br />moisture content, and compacted to a minimum of 90 percent of the <br />maximum dry density as determined by ASTM Test Method D 1557. The <br />optimum lift thickness to produce a uniformly compacted fill will depend on <br />the type and size of compaction equipment used. Aggregate base for <br />pavement should be compacted to a minimum of 95 percent relative <br />compaction. <br />4.2.2 Trench Backfill <br />Utility trenches should be backfilled with compacted fill in accordance with <br />Sections 306-1.2 and 306-1.3 of the Standard Specifications for Public <br />Works Construction, ("Greenbook"), 2015 Edition. Utility trenches can be <br />backfilled with onsite sandy material free of rubble, debris, organic and <br />oversized material up to 3 inches in largest dimension. Prior to backfilling <br />trenches, pipes should be bedded in and covered with either: <br />(1) Granular Bedding Materials: One -inch open -graded aggregate or a <br />uniform, sand material that has a Sand Equivalent (SE) greater -than - <br />or -equal -to 30, passing the No. 4 U.S. Standard Sieve (or as specified <br />by the pipe manufacturer), water densified in place, or <br />(2) CLSM: Controlled Low Strength Material (CLSM) conforming to <br />Section 201-6 of the Standard Specifications for Public Works <br />Construction, ("Green book"), 2015 Edition. <br />Pipe bedding should extend at least 4 inches below the pipeline invert and <br />at least 12 inches over the top of the pipeline. Native and clean fill soils <br />can be used as backfill over the pipe bedding zone, and should be placed <br />in thin lifts, moisture conditioned above optimum, and mechanically <br />compacted to at least 90 percent relative compaction, relative to the <br />ASTM D 1557 laboratory maximum density. The relative compaction for <br />the last 12 inches of the trench backfill should be 95 percent. <br />4.2.3 Foundation Design Recommendations <br />No structural loading information is available at this time. The following <br />parameters may be used for evaluating foundation alternatives for new <br />buildings: <br />�'♦� <br />13 / <br />Leighton <br />