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excavation shall be cleaned of all debris and dewatered unless "ponding" has <br />been authorized. Tn addition, where required by the Engineer, the earth bank <br />will be stepped to avoid a vertical shear plane. The backfill material shall <br />be placed in uniform horizontal layers of six inches in depth the full width of <br />~• the excavation, brought to proper moisture content and thoroughly <br />compacted, using handor mechanical tampers prior to placing the next layer. <br />The material shall be compacted to a density equal to or greater than that <br />of the surrounding earth before the next layer is placed. Should the backfill <br />material be considered too wet or too dry by the Engineer, drying or wetting <br />prior to placement in the excavation may be required. The work shall be <br />performed in such a manner that when finished, the entire backfill shall have <br />a uniform density in excess to that of the adjacent natural ground. <br />All backfilling in trenches, around pipes, structures or against natural faces <br />shall be compacted to 100% density as determined by the Standard Proctor <br />Test, and shall be hand compacted to prevent damage to pipes or structures. <br />3.07 Subsoil Stabilization <br />A. General <br />In areas where a firm foundation is required, such as under all concrete <br />structures, the subsoil shall be firm and compact, in the opinion of the <br />Engineer. <br />Should the subsoil for structures be classed as unsuitable for foundation <br />subgrade, it shall be completely removed to a depth specified by the <br />Engineer and replaced with an approved material Unsuitable material shall <br />be wasted as directed by the Engineer. Where dewatering is required to <br />obtain a firm foundation the Contractor shall pump the area dry= and <br />-- maintain this condition until the foundation has been prepared to the <br />satisfaction of the Engineer and the concrete or other material placed in <br />accordance with the Plans and Specifications. <br />3.08 Grading <br />A. General <br />After construction is finished and all backfilling is completed and settled, all <br />areas within the work site shall be graded in accordance with the grading <br />plan or as directed by the Engineer. During this operation, stockpiled topsoil <br />shall be spread uniformly a minimum thickness of 6 inches over the areas to <br />be seeded or sodded as directed in these Specifications. The work shall be <br />performed so that when finished, there will be no drainage pockets and the <br />finished embankments, dikes, ditches and roadways shall be to the true <br />elevations .and dimensions shown on the plans. <br />After the grading has been finished, the entire area shall be cleared of all <br />debris such as construction scraps, brush, paper and salvaged materials, and <br />the site of the work left with a neat appearance. Any salvaged material to <br />remain as the property of the Owner shall be neatly stockpiled as directed <br />by the Engineer. <br />L <br />02200-10 <br />