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5 MATERIALS <br />5.1 COMMON FILL AND GENERAL FILL <br />5.1.1 Common fill and general fill shall consist of well-graded silty sands <br />and gravels obtained from designated borrow areas and <br />excavations within and adjacent to the Work site. Common fill <br />shall be generally free of topsoil, organics and other deleterious <br />material, however minor amounts will be permitted. The maximum <br />size of cobbles and rocks permitted in common fill shall be 12 <br />inches. <br />5.1.2 Common and general fill used for backfilling trenches shall generally <br />be the native soil excavated from the trench unless such soil <br />contains an inordinate amount of organics and deleterious material, <br />or the moisture content is significantly higher than optimum. In <br />such cases, the Engineer may require that common fill be hauled <br />from a designated borrow area. <br />5.2 SELECT FILL <br />5.2.1 Select fill shall consist of well-graded native soils consisting of silty <br />sands and gravels obtained from borrow or from the excavations. <br />Select tills shall be free of topsoil, organic material, debris, and <br />other deleterious material. Occasional gravels and cobbles no <br />larger than three inches (3") in size and no greater than twenty <br />percent (20°k1 for cobble sizes larger than two inches (2"1 by <br />weight will be allowed. Select fill shall have a minimum of 25 <br />percent by weight passing the #100 sieve. <br />5.2.2 Select fill materials shall be selected from the borrow and trench <br />excavations for certain characteristics such as high density, high <br />strength and low compressibility. If sufficient quantities of select <br />fill are not found locally as native soils, Engineer may require that <br />the Contractor screen the local material to meet the specifications <br />above. <br />5.3 EMBEDMENT MATERIAL <br />5.3.1 Embedment Material for pipelines shall consist of 3/8-inch to 1-inch <br />aggregate, or similar material specifically designed for use as pipe <br />bedding. <br />SPEC. A -EARTHWORK <br />PAGE 5 <br />