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Kvaerner Metals <br /> <br /> <br /> <br /> <br /> <br /> <br />Project No. 306900 <br />General Specification No. GC-01 <br />Site Work <br />7.0 UTILITY EXCAVATION AND BACKFILL <br />Excavated material shall be piled neatly along the side of the trench excavations in such <br />a manner as to be of as little inconvenience as possible. <br />Trenches may be excavated either by hand, or by machine, and excavation shall begin <br />at the outlet end and proceed upgrade. The lower portion of the trench, up to an <br />elevation of approximately 12 in. above the top of the pipe, shall be cut with the sides <br />substantially vertical. The upper portion of the trench may be widened or flared to <br />obviate the need for shoring and bracing, if approved by the Engineer. Conduit and pipe <br />trench bottoms shall be evenly pitched as required. <br />Where utilities are to be installed in new embankment fills, the embankment shall first be <br />constructed and compacted to an elevation approximately 12 in. above the top of utility, <br />or as directed by the Engineer, after which the trench may be excavated. <br />' The Engineer shall have the right to limit the amount of trench which is opened or <br />partially opened at any one time and also to limit the amount of trench left without <br />backfill, at any one time. <br />Excavations for utility structures shall be made to the depths as indicated on the <br />drawings, and with sufficient side clearances to provide adequate working space for the <br />' construction of the respective structures. <br />When unsatisfactory soil conditions, such as soft mud, quicksand, or other unstable <br />material, are encountered at the bottom of excavations, the bed shall be made firm and <br />solid by removing the unstsble material to a sufficient depth, and replacing it with <br />crushed rock, gravel, or other approved material, well compacted into place in an <br />approved manner, and to the satisfaction of the Engineer. <br />' Subcontractor shall furnish, place, and maintain such bracing and shoring as may be <br />required to support the sides of the excavations for the proper protection of the workmen <br />and to facilitate the work, and to prevent damage to adjacent structures or facilities. <br />Upon completion of the work, all bracing and shoring shall be removed. <br />1 Foot bridges of approved construction, not less than 4 ft wide, and provided with <br />handrails and uprights of dressed lumber, shall be installed by Subcontractor over <br />trenches at all cross walk intersections, and at such other points where, in the opinion of <br />' the Engineer, traffic conditions make it necessary. Substantially constructed bridges, <br />adequate for handling all vehicular traffic, shall be installed by Subcontractor over any <br />trench or other excavation intersecting a road, whenever such excavation is in excess of <br />' half the width of the road crossing. <br />All bridges required to be installed, shall be maintained in place by Subcontractor in good <br />working order as long as the condition of ~h= •;.erk require= thsir uve. -~ _ <br />Excavation and other work under or adjacent to existing sewer lines, pipe lines, conduit <br />' runs, or structures of any kind, shall be done in such manner as not to interfere with the <br />safe operation and use of such installations. Should any damage be incurred to existing <br />J.V0691WPl5PEGl5TAUGT00015PC.DOC. Rev ~1~ 9 ~~ Pinned luh/2'l, 1899 <br />