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13-05 <br /> <br />13-06 <br /> <br />If the native material does not compact as required, the Engineer <br />will require that imported backfill material be used. The <br />imported material shall be sandy or' granular material meeting the <br />following gradation requirements. <br /> <br />Sieve Size Percent Passing <br /> <br />4" 100% <br />1" 95 - 100% <br />No. 200 4 - 8% <br /> <br />Preparation of Foundations: Foundation upon which concrete is to be <br />poured or pipe is to be placed shall be prepared to dimensions shown on <br />the drawings. Any and al~ excess excavation or over-excavation beyond <br />the excavation lines shown on the drawings shall be backfilled to grade <br />with crushed rock or gravel bedding at the expense of the Contractor. <br />Where material encountered at grade for the pipe and structures is <br />considered unsatisfactory for foundation by the Engineer, the Contractor <br />shall remove such material as directed in writing and refill to grade <br />with crushed rock or gravel at the expense of the City. <br /> <br />The Contractor shall take all necessary precautions to preserve the <br />material below and beyond the lines of all excavations in a sound <br />condition. In the event that suitable foundation at grade for pipe or <br />structures become unsuitable as a result of the Contractor's operations <br />or other causes and whether or not specifically due to the action of the <br />Contractor, the Contractor shall remove such unsuitable material as <br />directed by the Engineer and refill to grade with crushed rock or gravel <br />bedding at no cost to City. <br /> <br /> Backfill Around Pipes and Structures: Where reference is made in these <br /> specifications for testing by the l~est revision of Test Method No. <br /> California 216 of the Department of Transportation of the State of <br /> California determining relative compaction, the latest revision of Test <br /> Method No. California 231 can be substituted for Test Method No. 216 if <br /> so directed by the Engineer. <br /> <br /> No backfilling shall be placed around or over any concrete or masonry <br /> structures, sewers, or other pipe ~ines or conduits until such <br /> structures or lines have been entirely completed and have attained <br /> sufficient strength to sustain the load imposed. No backfilling shall <br /> be undertaken until the expressed permission of the Engineer has been <br /> given. Excavated materials, when required for backfill, shall be <br /> moistened, mixed and/or dried to obtain the moisture content and <br /> gradation necessary for proper installation and compaction. Backfill <br /> shall be carefully placed around and over the pipe and structures and <br /> shall not be permitted to fall directly on the pipe or structures from a <br /> height which will cause damage. <br /> <br /> All excavation shall be backfilled to the original grade unless <br /> otherwise indicated in the specifications or on the plans. All <br /> materials, equipment and methods used shall be subject to the approval <br /> <br />CDS.1.12 13-2 <br /> <br /> <br />