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<br /> <br />598 Pipes, cuhrerts, sewers, and other miscellaneous structures outside the roadway prism and not <br />599 subjected to traffic loads shall be backfilled in layers as described above but shall be compacted <br />600 to the density of the surrounding earth. , <br />601 <br />602 The excessive use of water during backfilling operations will not be pe;rmitted. Compaction <br />603 equipment or methods that produce horizontal or vertical earth pressures, which may cause ' <br />604 excessive displacement or overturning, or may damage structures, shall not be used. <br />605 <br /> <br />606 <br />Backfill material shall not be deposited against newly constructed masonry or concrete structures ' <br />607 until the concrete has developed a compressive strength of 0.8f'c. Backfill at the inside of bridge <br />608 wingwalls and abutments shall be placed before curbs or sidewalks are constructed over the <br /> <br />609 <br />backfill and before railings on the wingwalls are constructed. ' <br />610 <br />611 <br />612 Unless otherwise indicated in the Contract or directed, all sheeting and bracing used in making <br />structure excavation shall be removed by the Contractor prior to backfilling. ' <br />613 <br />614 Structure backfill placed at bridge piers in waterways and water channels, that does not support <br /> <br />615 <br />embankments, pavements, or slope protection, will not require compaction. ' <br />616 <br />617 Compaction of structure backfill (flow-fill) will not be required. <br /> <br />618 ' <br />619 The maximum layer thickness for structure backfill (flow-fill) shall be 3 'feet. Additional layers <br />620 shall not be placed until the structure backfill (flow-fill) has Lost sufficient moisture to be walked <br />621 on without indenting more than 2 inches. Damage resulting from placing structure backfill (flow- <br />622 fill) in layers that are too thick or from not allowing sufficient time between placement of layers <br />623 shall be repaired at the Contractor's expense. <br /> <br />624 , <br />625 When the Contractor substitutes Structure Backfill (Flow-Fill} for Structure Backfill (Class 1) or <br />626 (Class 2), the trench width may be reduced to provide a minimum 6 inch clearance between the <br /> <br />627 <br />outside diameter of the culvert and the trench wall. , <br />628 <br />629 206.04 Bed Course Material. Construction requirements for beef course material for <br /> <br />630 <br />sidewalks and curbing shall conform to the applicable requirements of Sections 608 and 609. , <br />631 <br />632 206.05 Filter Material. Construction requirements for filter material for subsurface drains ' <br />633 shall conform to the applicable requirements of Section 605. Filter material shall be placed <br />634 behind bridge abutments, wingwalls, and retaining walls as provided in the Contract and in <br />635 accordance with the following requirements: When provided in the Contract, wall drain outlets ' <br />636 shall be backed with sacked filter material conforming to the gradation requirements for coazse <br />637 aggregate No. 3 or No. 4 set forth in Table 703-2. <br />638 , <br />639 Filter material shall be placed in horizontal layers along with and by the same methods specified <br />640 for structure backfill. <br />641 , <br /> <br /> 3-16 <br /> G:\101\OOt00.OTW1Raports\KP\TeMnical fipecifiwlions.tloc February 3, 2006 <br />1 <br />