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�' <br />� <br />� <br />.�' <br />C� <br />'J . <br />� <br />�, <br />� <br />�� <br />� <br />� <br />� <br />L:,1 <br />� <br />� <br />603,200 Preoaration of Soil DurinR p_ lAs L�& <br />0 1 <br />600-� <br />At the time of pipe placement, the beddi � <br />to provide uniform and continuous 9U � �onditions shall be such as <br />holes. Bell holes shall be excavatedpastnecessaryptoemakeWthe boint <br />connections, but they shall be no larger than would be adequate� No <br />pipe material shall be laid in water nor when the treneh or bedding <br />conditions are otherwise unsuitable or improper. � <br />If•trench bottom conditions are encountered which appear to require <br />stabilization, the Engineer shall be informed. <br />shall be examined by the Engineer to determine theenaturehof�suehions <br />instability, employing the services of a testing laboratory i€ <br />necessary, If it is determined that the trench bottom cannot su <br />the pipe, a further depth and/or width shall be excavated and refilled <br />to the pipe foundation grade with granular foundation material and <br />thoroughly compacted. <br />If the examination by the Engineer reveals that the a�'oredescribed <br />conditions are caused by the Contractor�s manipulation of the soils in <br />the presence of excessive moisture or lack of proper dewatering, �he <br />Contractor shall take suQh steps as are necessary to sCabilize the <br />trench bottom including the use of pipe support roaterial and improved <br />dewatering methods. In such case, the cost of ineasure necessary shal <br />be borne by the Contractor. 1 <br />When the bottom of the trench consists of a material suitable to <br />properly supporC the p�,pe the following methoda of bedding shall appl • <br />Y• <br />(1) Granular bedding material will ue placed belgw th� midpoint <br />the pipe, prior to pipe installation� to facilitat;e prop�r of <br />shaping and achieve uniform �,ipe support� using hand compaction <br />methods. <br />(2) Cranular backfill material at pfpe zone shall be free from <br />rock, boulders or other unsuitable substances and shall be <br />deposited into the trench simultaneously on both sides of pipe <br />for the full Width of the treneh in six-inch lifts thor�oughly <br />compacted to a�inimum elevation of one foot above the top of <br />the pipe, �omp��tion shall be accompl��hed by oechanical <br />tamping. <br />i3) The granular backfill maLerial shall be placed t� the to 0 <br />the trer�eh of street subgrade elevation in level� successive <br />layers, having a thickness of not greater than �2 inches, <br />Each successive layer shall be thoroughly compaeted as <br />speeified prior to the placement or addiCional layers, If the <br />specified compaction is not being attained utilizing the <br />equipment and materials available, the thickne�s of the 1,ayers <br />shall be reduced, The addition of water to the back£i11 <br />materials should be limited to act�ievi <br />moisture content for compaetion controing, ifsnecessaryry <br />Compaction of the backfill shou1d b� attained using vibratory, <br />non-vibratory, or mechanical rammer-type compactors. The type <br />� <br />� <br />